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California Polytechnic State University, San Luis Obispo

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Articles 511 - 540 of 585

Full-Text Articles in Materials Science and Engineering

Undergraduate Course In Environmental Design And Manufacturing, Andrew S. Borchers, Trevor S. Harding, Terri Lynch-Carls, Benjamin Redekop, Craig Hoff, Jackie El-Sayed, Daryl Doyle Jan 2005

Undergraduate Course In Environmental Design And Manufacturing, Andrew S. Borchers, Trevor S. Harding, Terri Lynch-Carls, Benjamin Redekop, Craig Hoff, Jackie El-Sayed, Daryl Doyle

Materials Engineering

This paper is a progress report on the development of an undergraduate course in environmental design and manufacturing. The importance of the topic is clear from National Academy of Engineering statements regarding the need to incorporate content on sustainable technology. The multidisciplinary team includes academic faculty from engineering, science, liberal studies, and business in collaboration with industry partners. The team's approach is to create a case-based course by adapting existing educational modules from Ford Motor Company. The group has received National Science Foundation funding for this project (DUE-0511322), and the project is currently in its beginning phases.

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Cheating In College And The Workplace: An Examination Of Engineering Undergraduates' Ethical Behavior, Trevor S. Harding, Donald D. Carpenter, Cynthia J. Finelli Jan 2005

Cheating In College And The Workplace: An Examination Of Engineering Undergraduates' Ethical Behavior, Trevor S. Harding, Donald D. Carpenter, Cynthia J. Finelli

Materials Engineering

Research has demonstrated that engineering undergraduates report higher rates of cheating than those in other disciplines and that students who cheat in college are more likely to make unethical decisions as professionals. Therefore, better understanding the decision-making processes of engineering students and professionals who engage in dishonest behavior could lead to effective college-level interventions to cheating that have a positive impact on the ethical behavior of future professionals. To explore the relationship between academic and professional ethical behavior, the authors launched the Work Experience Study (WES) that examines students’ decision-making in situations where they are tempted to engage in unethical …

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The Role Of Moral Philosophy In Promoting Academic Integrity Among Engineering Students, Brian K. Etter, Trevor S. Harding, Cynthia J. Finelli, Donald D. Carpenter Oct 2004

The Role Of Moral Philosophy In Promoting Academic Integrity Among Engineering Students, Brian K. Etter, Trevor S. Harding, Cynthia J. Finelli, Donald D. Carpenter

Materials Engineering

Academic dishonesty is nothing new, yet it is particularly disturbing to find among engineering students, whose professional lives need to be guided by the highest ethical standards. Moral philosophy may illuminate some of the conditions for recovering a sense of the ethical for engineering students. Classical moral philosophers held that people belong to communities in ways that inform their sense of obligation. Recognition of these communities would make concrete the engineer's responsibility for the health, safety and welfare of the public. A further difficulty is that the primary community that students know is simply that of their peers in school …

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Work In Progress – Classical Ballet Structure And Practice Applied To Engineering Class Sessions, Blair London, Lisa Deyo Oct 2004

Work In Progress – Classical Ballet Structure And Practice Applied To Engineering Class Sessions, Blair London, Lisa Deyo

Materials Engineering

Classical ballet classes have a universal structure that fosters active in-class learning. This structure creates a safe environment for students to try, fail, be corrected, and succeed. Engineering classes lack a common structure; most learning in engineering occurs outside of class. Engineering classes could move toward adopting a similar structure to ballet to improve in-class learning and mirror engineering culture and practice. The paper describes aspects of ballet class structure and practices that work and how these can apply to engineering classes. A new engineering class session structure is presented following the ballet model where engineering students are motivated to …

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Travelogue From The Materials World: A First Week Laboratory Activity, Katherine C. Chen, Blair London, Linda Vanasupa, Timothy T. Orling, Lisa Christensen Jun 2004

Travelogue From The Materials World: A First Week Laboratory Activity, Katherine C. Chen, Blair London, Linda Vanasupa, Timothy T. Orling, Lisa Christensen

Materials Engineering

A fun, yet educational, laboratory activity was developed for the first week of an introductory Materials Engineering laboratory in order to set the stage for the rest of the quarter. The class is broken up into 8 teams, and each team performs a different experiment during each lab period. The teams then rotate lab experiments each week in a round robin manner, and thus teamwork is an important component of the class. In order to quickly promote team bonding the very first week, each team goes on a materials scavenger hunt together. A variety of materials-related items are to be …

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Interactive Demonstrations And Laboratories Using Shape Memory Alloys, Wendy C. Crone, Eric J. Voss, Katherine C. Chen Jun 2004

Interactive Demonstrations And Laboratories Using Shape Memory Alloys, Wendy C. Crone, Eric J. Voss, Katherine C. Chen

Materials Engineering

Shape memory alloys (SMAs) constitute a unique class of materials that undergo a reversible phase transformation allowing the material to display dramatic stress-induced and temperature-induced deformations that are recoverable. Nickel titanium (NiTi) is a shape memory alloy used in a wide variety of biomedical, aerospace, automotive and other applications. The austenite-martensite phase transformation that occurs in these alloys with changes in temperature or applied stress is responsible for the unique properties of this material. The unusual behavior of SMAs provides an exciting way to engage students and can be incorporated into a variety of courses under topics such as phase …

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The Influence Of Academic Dishonesty On Ethical Decision- Making In The Workplace: A Study Of Engineering Students, Trevor S. Harding, Donald D. Carpenter, Cynthia J. Finelli, Honor J. Passow Jun 2004

The Influence Of Academic Dishonesty On Ethical Decision- Making In The Workplace: A Study Of Engineering Students, Trevor S. Harding, Donald D. Carpenter, Cynthia J. Finelli, Honor J. Passow

Materials Engineering

According to studies conducted over the past four decades, engineering students self-report high frequencies of academic dishonesty (cheating) while in college. Research on college students in all fields has indicated that such behavior is more common among students who participate in academic dishonesty at the high school level and that it is correlated with other deviant or unethical behaviors, such as petty theft and lying. If, in fact, such correlations do exist, one might hypothesize that there is also a relationship between academic dishonesty in college and deviant or unethical behavior in professional practice. Placing this relationship in the context …

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Life Cycle Assessment As A Tool For Green Manufacturing Education, Trevor S. Harding Jun 2004

Life Cycle Assessment As A Tool For Green Manufacturing Education, Trevor S. Harding

Materials Engineering

The design and production of engineering products that have a reduced impact on the environment and human health has increasingly become a strategic goal of corporations. Consequently, starting engineers will need to be educated in green design techniques. One method that is particularly attractive to engineers is Life Cycle Assessment (LCA). LCA is an objective approach to evaluating the environmental burden of a product, process or activity by identifying and quantifying material and energy usage and waste outputs at every life stage. LCA involves three steps: identification of scope of analysis, life cycle inventory, and impact analysis. Such an approach …

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Does Academic Dishonesty Relate To Unethical Behavior In Professional Practice? An Exploratory Study, Trevor S. Harding, Donald D. Carpenter, Cynthia J. Finelli, Honor J. Passow Jun 2004

Does Academic Dishonesty Relate To Unethical Behavior In Professional Practice? An Exploratory Study, Trevor S. Harding, Donald D. Carpenter, Cynthia J. Finelli, Honor J. Passow

Materials Engineering

Previous research indicates that students in engineering self-report cheating in college at higher rates than those in most other disciplines. Prior work also suggests that participation in one deviant behavior is a reasonable predictor of future deviant behavior. This combination of factors leads to a situation where engineering students who frequently participate in academic dishonesty are more likely to make unethical decisions in professional practice. To investigate this scenario, we propose the hypotheses that (1) there are similarities in the decision-making processes used by engineering students when considering whether or not to participate in academic and professional dishonesty, and (2) …

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Investigation Of Subcritical Fatigue Crack Growth In Gamma Titanium Aluminides, Blair London May 2004

Investigation Of Subcritical Fatigue Crack Growth In Gamma Titanium Aluminides, Blair London

Materials Engineering

Our titanium aluminide alloy was readily heat treated to a fully lamellar state by holding at 1345C for 1.5 hours and furnace cooling resulting in a grain size of 330 muon m. The yield stress, ultimate stress, and total elongation were 315MPa, 465MPa, and 0.46% respectively. The fully lamellar microstructure shows significant work hardening. No long cracks initiated at R=0.1 and variation max=300MPa with up to 1.4 million cycles.

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Teaching Corporate Culture: An Engineer's Survival Guide, Richard N. Savage Apr 2004

Teaching Corporate Culture: An Engineer's Survival Guide, Richard N. Savage

Materials Engineering

The transition from new engineering graduate to successful member of corporate America is a difficult journey. Often the skills required are not part of a student’s traditional undergraduate education. At Cal Poly, we have integrated a new course into our existing Senior Project curriculum which enables students to develop the professional skills necessary to become an effective member of any corporation. Key skills such as communication, problem solving and project management are practiced through active learning techniques. These as well as other topics studied are required for ABET certification. The new course investigates the mission and values that are at …

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An Examination Of The Relationship Between Academic Dishonesty And Professional Behavior, Trevor S. Harding, Honor J. Passow, Donald D. Carpenter, Cynthia J. Finelli Nov 2003

An Examination Of The Relationship Between Academic Dishonesty And Professional Behavior, Trevor S. Harding, Honor J. Passow, Donald D. Carpenter, Cynthia J. Finelli

Materials Engineering

A number of recent studies have found correlations between academic dishonesty in higher education and unethical behavior in the work settings. However, these studies have not explored the causal relationship between the underlying factors that lead to this dishonesty. This realization, and apparently high levels of cheating among engineering students, has lead us to a research hypothesis that decision making patterns about academic cheating among engineering students are positively correlated with those individuals' decision making patterns about work place ethics and responsibility. To test our hypothesis, we have developed an exploratory survey that asks questions about the respondent's decisions during …

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Effects Of Intermetallic Morphology At The Metallic Particle/Solder Interface On Mechanical Properties Of Sn-Ag-Based Solder Joints, H. Rhee, F. Guo, J. G. Lee, Katherine C. Chen, K. N. Subramanian Nov 2003

Effects Of Intermetallic Morphology At The Metallic Particle/Solder Interface On Mechanical Properties Of Sn-Ag-Based Solder Joints, H. Rhee, F. Guo, J. G. Lee, Katherine C. Chen, K. N. Subramanian

Materials Engineering

Mechanical incorporation of metallic particles in the Sn-Ag-based solder resulted in various intermetallic compound (IMC) morphologies around these particles during reflow. Unlike with the Ni particles, the IMCs formed around Cu and Ag particles are relatively insensitive to reflow profiles employed. The IMC formed around the Ni particles ranges from “sunflower” morphology to “blocky” morphology with increasing time and temperature above liquidus during the heating part of the reflow profile. Mechanical properties, such as simple shear strength and creep behavior, of these composite solders were affected by the IMC morphologies in the composite solders investigated. Sunflower-shaped IMC formed around an …

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Formation And Growth Of Intermetallics Around Metallic Particles In Eutectic Sn-Ag Solder, J. G. Lee, Katherine C. Chen, K. N. Subrmanian Nov 2003

Formation And Growth Of Intermetallics Around Metallic Particles In Eutectic Sn-Ag Solder, J. G. Lee, Katherine C. Chen, K. N. Subrmanian

Materials Engineering

Incorporation of metallic particulate reinforcements in eutectic Sn-Ag solder results in the formation of intermetallic compounds (IMCs) along particulate/ solder interfaces with different morphologies. For instance, “sunflower” and “blocky faceted” IMC shapes have been observed around Ni particle reinforcements incorporated in the eutectic Sn-Ag solder matrix. The time and temperature above solder liquidus during the heating stage of the reflow process has been found to play a significant role in determining the IMC morphology in these Ni particulate-reinforced solders. Similar studies were carried out with Cu and Ag particulate reinforcements using the same solder matrix. The amount of heat input …

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Semiconductor Wafer Processing System With Vertically-Stacked Process Chambers And Single-Axis Dual-Wafer Transfer System, Richard N. Savage, Frank S. Menagh, Helder R. Carvalheira, Philip A. Troiani, Dan L. Cossentine, Eric R. Vaughan, Bruce E. Mayer Aug 2003

Semiconductor Wafer Processing System With Vertically-Stacked Process Chambers And Single-Axis Dual-Wafer Transfer System, Richard N. Savage, Frank S. Menagh, Helder R. Carvalheira, Philip A. Troiani, Dan L. Cossentine, Eric R. Vaughan, Bruce E. Mayer

Materials Engineering

A semiconductor wafer processing system including a multi-chamber module having vertically-stacked semiconductor wafer process chambers and a loadlock chamber dedicated to each semiconductor wafer process chamber. Each process chamber includes a chuck for holding a wafer during wafer processing. The multi-chamber modules may be oriented in a linear array. The system further includes an apparatus having a dual-wafer single-axis transfer arm including a monolithic arm pivotally mounted within said loadlock chamber about a single pivot axis. The apparatus is adapted to carry two wafers, one unprocessed and one processed, simultaneously between the loadlock chamber and the process chamber. A method …

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Niti - Magic Or Phase Transformation?, Katherine C. Chen Jun 2003

Niti - Magic Or Phase Transformation?, Katherine C. Chen

Materials Engineering

NiTi alloys possess exciting properties and are staples in materials demonstrations. The shape memory effect and superelasticity property of NiTi fascinate people, but actually require significant materials knowledge to fully understand the phenomena. A laboratory dealing with phase transformations was thus developed to capitalize on the allure of NiTi for a junior/senior level “Thermodynamics and Kinetics of Materials” course. Students examine and characterize the shape memory and superelastic properties of NiTi wire, and then realize the difference is in the transformation temperature (i.e., Af - the austenitic finish temperature). They then use the phase diagram and TTT diagram to develop …

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How We Learned To Love The Phase Diagram With A Ti-Cr Alloy Characterization Lab, Katherine C. Chen Jun 2003

How We Learned To Love The Phase Diagram With A Ti-Cr Alloy Characterization Lab, Katherine C. Chen

Materials Engineering

While many students learn how to read and use a phase diagram in introductory materials courses, greater appreciation for such a tool can be garnered through the laboratory setting. A laboratory module for a “Structures of Materials” class (a “core class” for materials majors) has been developed to demonstrate the usefulness of phase diagrams, as well as, to emphasize the connections among processing, structure, and properties. Competence in determining stable phases, phase compositions, and mass fractions of phases are not the end goal, per se, but transpire since the skills are required to help solve a puzzle. Students are given …

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Students' Perceptions Of Both The Certainty And The Deterrent Effect Of Potential Consequences Of Cheating, Cynthia J. Finelli, Trevor S. Harding, Donald D. Carpenter, Honor J. Passow Jun 2003

Students' Perceptions Of Both The Certainty And The Deterrent Effect Of Potential Consequences Of Cheating, Cynthia J. Finelli, Trevor S. Harding, Donald D. Carpenter, Honor J. Passow

Materials Engineering

No abstract provided.

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Physical Metallurgy: Providing Unifying Principles In Diverse Areas Of Materials Engineering, Katherine C. Chen, Vilupanur A. Ravi May 2003

Physical Metallurgy: Providing Unifying Principles In Diverse Areas Of Materials Engineering, Katherine C. Chen, Vilupanur A. Ravi

Materials Engineering

No abstract provided.

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Structural And Diffusional Effects Of Hydrogen In Tini, Alan R. Pelton, Christine Trépanier, Xiao-Yan Gong, Andreas Wick, Katherine C. Chen May 2003

Structural And Diffusional Effects Of Hydrogen In Tini, Alan R. Pelton, Christine Trépanier, Xiao-Yan Gong, Andreas Wick, Katherine C. Chen

Materials Engineering

Hydrogen can be inadvertently added to Nitinol medical devices through electropolishing, caustic cleaning, or exposure to other acidic or basic solutions. Moderately high hydrogen concentrations can lead to embrittlement characterized by lowered ductility and changes in transformation behavior. The purpose of the present report is to discuss recent results on the effects of hydrogen in annealed TiNi. Samples are charged with hydrogen and analyzed with x-ray diffraction; these data indicate that even relatively small amounts of hydrogen can affect the crystal structure. Additions of up to 1000 wppm hydrogen increase the atomic volume by more than 2%, decrease peak intensity …

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Student Perceptions Of Institutional And Instructor Based Techniques For Dealing With Academic Dishonesty, Donald D. Carpenter, Trevor S. Harding, Susan M. Montgomery, Nicholas H. Steneck, Eric Dey Nov 2002

Student Perceptions Of Institutional And Instructor Based Techniques For Dealing With Academic Dishonesty, Donald D. Carpenter, Trevor S. Harding, Susan M. Montgomery, Nicholas H. Steneck, Eric Dey

Materials Engineering

Research suggests that a large percentage of engineering students engage in some form of academic dishonesty. To investigate this very serious concern, the authors have undertaken a research project on the Perceptions and Attitudes toward Cheating among Engineering Students (PACES). The premise of this research is that a combination of pressures, rather than malicious motivations, account for most student cheating. This paper focuses on a portion of the PACES survey; student opinions on what actions might prevent cheating. The authors examined data collected from approximately 350 engineering and pre-engineering undergraduate students at 5 institutions. In the survey, the students were …

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A Comparison Of The Role Of Academic Dishonesty Policies Of Several Colleges On The Cheating Behavior Of Engineering And Pre-Engineering Students, Trevor S. Harding, Donald D. Carpenter, Susan M. Montgomery, Nicholas H. Steneck Nov 2002

A Comparison Of The Role Of Academic Dishonesty Policies Of Several Colleges On The Cheating Behavior Of Engineering And Pre-Engineering Students, Trevor S. Harding, Donald D. Carpenter, Susan M. Montgomery, Nicholas H. Steneck

Materials Engineering

While universities take a variety of approaches in dealing with academic dishonesty, current evidence suggests that institutions with honor codes have a significantly lower level of self-reported cheating as compared to nonhonor code institutions. This paper focuses on five institutions and their effectiveness in dealing with cheating, specifically among engineering or pre-engineering students. The authors' goal is to provide greater understanding of what institutional approaches appear to be most effective in minimizing cheating among this specific sub-group. The paper presents a predictive model of the extent of cheating among engineering students at these institutions using a variety of variables, including …

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Damage Accumulation Under Repeated Reverse Stressing Of Sn-Ag Solder Joints, Katherine C. Chen, A. Telang, J. G. Lee, K. N. Subramanian Nov 2002

Damage Accumulation Under Repeated Reverse Stressing Of Sn-Ag Solder Joints, Katherine C. Chen, A. Telang, J. G. Lee, K. N. Subramanian

Materials Engineering

To better understand the effect of repeated reverse stress in solder joints, a new testing method was developed. Tin-silver solder joints were fabricated, constrained between Cu blocks, and then subjected to repeated shear loading in a tensile tester. Constant strain amplitudes were applied to simulate service conditions. However, large loads were used to accelerate the damage accumulation. Microstructural features of the damage were very similar to those found with studies on thermomechanical fatigue (TMF) of small, single shear lap samples. Concentrated-shear banding or striations were observed to form along Sn dendrites. The load behavior of the solder with each cycle …

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Fatigue Thresholds Of Cracks Resulting From Impact Damage To Γ-Tial, Trevor S. Harding, J. Wayne Jones Sep 2002

Fatigue Thresholds Of Cracks Resulting From Impact Damage To Γ-Tial, Trevor S. Harding, J. Wayne Jones

Materials Engineering

Significant research has been conducted in recent years on the γ-based titanium aluminide alloys. The low density of γ-TiAl relative to current nickel-based superalloys, has made it an attractive candidate for use in the low-pressure turbine blades of gas turbine engines . In addition to weight savings, the lower density leads to higher specific stiffness and good high temperature strength retention [1, 2 and 3]. However, the ordered crystal structure, typical of intermetallics, leads to inherently low room temperature ductility and fracture toughness. This raises serious concerns about the ability of this material to resist the formation of cracks at …

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Suggestions For Establishing Centers For Engineering Education, Trevor S. Harding, Cynthia J. Finelli Jun 2002

Suggestions For Establishing Centers For Engineering Education, Trevor S. Harding, Cynthia J. Finelli

Materials Engineering

No abstract provided.

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P.A.C.E.S. - A Study On Academic Integrity Among Engineering Undergraduates (Preliminary Conclusions), Donald D. Carpenter, Trevor S. Harding, Susan M. Montgomery, Nicholas H. Steneck Jun 2002

P.A.C.E.S. - A Study On Academic Integrity Among Engineering Undergraduates (Preliminary Conclusions), Donald D. Carpenter, Trevor S. Harding, Susan M. Montgomery, Nicholas H. Steneck

Materials Engineering

Student academic dishonesty, commonly referred to as cheating, has become a serious problem at institutions of higher education. This is particularly true of engineering students who, according to previous research, are among the most likely to cheat in college. To investigate this concern, the authors have undertaken a research project on the Perceptions and Attitudes toward Cheating among Engineering Students (P.A.C.E.S.). The premise of this research is that a combination of pressures, rather than malicious motivations, account for most student cheating. The P.A.C.E.S study consists of a seven page, self-reported survey that investigates: (1) student definitions of academic dishonesty; (2) …

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Integrating Manufacturing, Design And Teamwork Into A Materials And Process Selection Course, Trevor S. Harding, G. Y. Lai, B. L. Tuttle, C. V. White Jun 2002

Integrating Manufacturing, Design And Teamwork Into A Materials And Process Selection Course, Trevor S. Harding, G. Y. Lai, B. L. Tuttle, C. V. White

Materials Engineering

No abstract provided.

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The Effect Of Alloying On The Properties Of (Nb, Ti)Cr2 C15 Laves Phases, Dan J. Thoma, K. A. Nibur, Katherine C. Chen, J. C. Cooley, L. B. Dauelsberg, W. L. Hults, Paul G. Kotula Jun 2002

The Effect Of Alloying On The Properties Of (Nb, Ti)Cr2 C15 Laves Phases, Dan J. Thoma, K. A. Nibur, Katherine C. Chen, J. C. Cooley, L. B. Dauelsberg, W. L. Hults, Paul G. Kotula

Materials Engineering

The effect of composition on the ternary (NbCr2–TiCr2) C15 phase properties has been investigated, focusing upon the defect structure, elastic properties, and mechanical behavior. The C15 phase field is continuous between NbCr2–TiCr2, with a maximum phase field width of at least 7 at.% solubility. The defect mechanism is governed by anti-site constitutional defects for all alloys. Mechanically, the alloys display a maximum in hardness in the center of the ternary phase field (and a minimum of toughness). The ternary phase field has features that are characteristic of solid-solution strengthening mechanisms. …

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Phase Changes In Ni-Ti Under Laser Shock Loading, R. E. Hackenberg, D. C. Swift, J. C. Cooley, Katherine C. Chen, D. J. Thoma, D. L. Paisley, A. Hauer May 2002

Phase Changes In Ni-Ti Under Laser Shock Loading, R. E. Hackenberg, D. C. Swift, J. C. Cooley, Katherine C. Chen, D. J. Thoma, D. L. Paisley, A. Hauer

Materials Engineering

Near-equiatomic Ni-Ti, known for its shape memory behavior, can decompose to martensitic phases and/or second phase compounds. This phase competition is investigated in NixTi100-x (494Ti3 but no martensite in the AQ state, consistent with resistivity and dilatometry results which showed no hysteresis indicative of first order phase changes over 1.9 K4Ti3 amounts (present in the AQ state) did change upon loading, indicating the importance of shock-induced heating. A thermodynamically complete equation of state (EOS) for NiTi in its B2 (CsCl) structure was generated by ab initio quantum mechanical calculations. This was tested by …

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Evaluation Of A Threshold-Based Model Of The Elevated-Temperature Fatique Of Impact-Damaged Γ-Tial, Trevor S. Harding, J. Wayne Jones Dec 2001

Evaluation Of A Threshold-Based Model Of The Elevated-Temperature Fatique Of Impact-Damaged Γ-Tial, Trevor S. Harding, J. Wayne Jones

Materials Engineering

Step-loading fatigue tests have been conducted on two γ-TiAl alloys with differing microstructures following quasi-static indentations intended to simulate assembly-related impact damage to low-pressure turbine blades. Fatigue tests were conducted at 600 °C using computer-controlled servohydraulic loading at a frequency of 20 Hz. Reasonably good agreement was achieved between the fatigue data and calculated fatigue strength based on the fatigue threshold and measured impact severity. In certain cases, the fatigue threshold model fails to completely describe the data. These discrepancies may be related to residual stresses, variations in crack-shape morphology, and small-crack effects. Residual stresses could not be directly measured, …

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