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Articles 61 - 67 of 67
Full-Text Articles in Engineering
Engineering A Dynamic Science Learning Environment For K-12 Teachers, Patricia Hardré, Mark Nanny, Hazem Refai, Chen Ling, Janis Slater
Engineering A Dynamic Science Learning Environment For K-12 Teachers, Patricia Hardré, Mark Nanny, Hazem Refai, Chen Ling, Janis Slater
Dr. Chen Ling
The present study follows a cohort of 17 K-12 teachers through a six-week resident learning experience in science and engineering, and on into the planning and implementation of applications for their classrooms. This Research Experiences for Teachers (RET) program was examined using the strategic approach of design-based research, with its fluid, adaptive management of the complexity of authentic learning "in situ" and its attentive documentation of expected and unexpected events, in process and products, to capture the richness of teachers' and mentors' experiences. Research on effective teacher professional development, adult learning, situated cognition, and learning transfer were utilized to inform …
Effect Of Plastic Prestrain On High Cycle Fatigue Of Ti–6al–4v, David Lanning, Theodore Nicholas, George Haritos
Effect Of Plastic Prestrain On High Cycle Fatigue Of Ti–6al–4v, David Lanning, Theodore Nicholas, George Haritos
Dr. George K. Haritos
The effect of initial plastic strain on the high cycle fatigue (HCF) lives of smooth cylindrical Ti–6Al–4V specimens is investigated. Specimens were monotonically, quasi-statically loaded under strain control in tension to produce plastic strains from 1% to 5% and under load control in compression to produce 9.5% plastic strain. A step-loading technique was then employed to establish the 106 or 107 cycle fatigue limit stress under load control conditions for stress ratios of R=0.1, 0.5 and 0.8 at frequencies of either f=50 or 400 Hz. Results are compared with baseline fatigue limit stresses for Ti–6Al–4V without prior plastic strain. Initial …
On The Use Of Critical Distance Theories For The Prediction Of The High Cycle Fatigue Limit Stress In Notched Ti–6al–4v ☆, David Lanning, Theodore Nicholas, George Haritos
On The Use Of Critical Distance Theories For The Prediction Of The High Cycle Fatigue Limit Stress In Notched Ti–6al–4v ☆, David Lanning, Theodore Nicholas, George Haritos
Dr. George K. Haritos
Methods are investigated for predicting the high cycle fatigue (HCF) lives of notched cylindrical Ti–6Al–4V specimens using critical distance concepts that employ the stress distribution in the vicinity of the notch. Cylindrical fatigue specimens had circumferential V-notches with a range of elastic stress concentration factors (kt=1.97–4.07). Notched and unnotched specimens were cycled to failure using a step-loading technique to generate points on a Haigh (Goodman) diagram for a constant fatigue life of 106 cycles. Finite element solutions were generated to provide stress distributions for the notched gage sections. The stress distributions were used in the search for a critical distance …
Notch Size Effects In Hcf Behavior Of Ti–6al–4v, George Haritos, Theodore Nicholas, David Lanning
Notch Size Effects In Hcf Behavior Of Ti–6al–4v, George Haritos, Theodore Nicholas, David Lanning
Dr. George K. Haritos
The high cycle fatigue (HCF) behavior of Ti–6Al–4V is investigated for cylindrical specimens having three sizes of geometrically similar circumferential V-notches, each with an elastic stress concentration factor, Kt, of approximately 2.78. A step loading technique for obtaining a point on a constant life (106 cycles) Haigh diagram from a single test specimen was implemented. Tests were performed at stress ratios of R=0.1, 0.5, and 0.8 for specimens machined from two different product forms of Ti–6Al–4V, bar and plate forgings. Results indicate that while there is a definite notch size effect in the Ti–6Al–4V bar within …
The Elastic Response Of A Cohesive Aggregate—A Discrete Element Model With Coupled Particle Interaction, George Jefferson, George Haritos, Robert Mcmeeking
The Elastic Response Of A Cohesive Aggregate—A Discrete Element Model With Coupled Particle Interaction, George Jefferson, George Haritos, Robert Mcmeeking
Dr. George K. Haritos
A model is presented for the deformation of a cohesive aggregate of elastic particles that incorporates two important effects of large-sized inter-particle junctions. A finite element model is used to derive a particle response rule, for both normal and tangential relative deformations between pairs of particles. This model agrees with the Hertzian contact theory for small junctions, and is valid for junctions as large as half the nominal particle size. Further, the aggregate model uses elastic superposition to account for the coupled force–displacement response due to the simultaneous displacement of all of the neighbors of each particle in the aggregate. …
Classroom Exercise: Intro To Mechanical And Industrial Engineering, Erin Baker
Classroom Exercise: Intro To Mechanical And Industrial Engineering, Erin Baker
Sustainability Education Resources
This classroom exercise was developed for Introduction to Mechanical and Industrial Engineering; Engineering Sustainability: Energy and the Environment. This is a freshman class with a class size of about 200. It is intended to get students to think critically about energy in the economy; to recognize the power of technological change; and to inspire them to work toward solving climate change.
Binder Jet Additive Manufacturing Of Stainless Steel-Hydroxyapatite Bio-Composite, Don Suranga Dhanushka Uduwage
Binder Jet Additive Manufacturing Of Stainless Steel-Hydroxyapatite Bio-Composite, Don Suranga Dhanushka Uduwage
All Graduate Theses, Dissertations, and Other Capstone Projects
This study was conducted to create a bio-composite with a porous structure using the binder-jet printing additive manufacturing process. The samples were printed by changing the parameters such as layer thickness, roller speed, sintering time and sintering temperature of the X1-Lab binder jet additive manufacturing printer. The samples were printed 80% stainless steel 316 mixed with 20% Calcium Phosphate Tribasic by volume. Eight experiments were attempted to print according to the fractional factorial design of experiment. The effects of changing parameters on the mechanical properties of the new bio-composite was tested using ASTM E-09 compressive strength standards. The compression testing …