Nanoparticles Embedding Into Metallic Materials By Laser Direct Irradiation,
2015
University of Akron, Main campus
Nanoparticles Embedding Into Metallic Materials By Laser Direct Irradiation, Dong Lin, Chang Ye, Yiliang Liao, C. Liu, Gary Cheng
Dr. Chang Ye
We report a method to half-embed nanoparticles into metallic materials. Transparent and opaque nanoparticle (laser wavelength 1064 nm) were both successfully half-embedded (partial part of nanoparticles embedded into matrix while other parts still stay above the matrix) into metallic materials. Nanoparticles were coated on sample surface by dip coating before laser irradiation. After laser irradiation of different pulses and laser fluencies, nanoparticles were embedded into metal. The mechanism and process of embedding were investigated.
Mechanism Of Fatigue Performance Enhancement In A Laser Sintered Superhard Nanoparticles Reinforced Nanocomposite Followed By Laser Shock Peening,
2015
University of Akron, Main campus
Mechanism Of Fatigue Performance Enhancement In A Laser Sintered Superhard Nanoparticles Reinforced Nanocomposite Followed By Laser Shock Peening, Dong Lin, Chang Ye, Yiliang Liao, Sergey Suslov, Richard Liu, Gary Cheng
Dr. Chang Ye
This study investigates the fundamental mechanism of fatigue performance enhancement during a novel hybrid manufacturing process, which combines laser sintering of superhard nanoparticlesintegrated nanocomposites and laser shock peening (LSP). Through laser sintering, TiNnanoparticles are integrated uniformly into iron matrix to form a nanocomposite layer near thesurface of AISI4140 steel. LSP is then performed on the nanocomposite layer to generate interaction between nanoparticles and shock waves. The fundamental mechanism of fatigue performance enhancement is discussed in this paper. During laser shock interaction with thenanocomposites, the existence of nanoparticles increases the dislocation density and also helps to pin the dislocation movement. As …
An Extended Finite Element Method (Xfem) Study On The Effect Of Reinforcing Particles On The Crack Propagation Behavior In A Metal–Matrix Composite,
2015
University of Akron, Main campus
An Extended Finite Element Method (Xfem) Study On The Effect Of Reinforcing Particles On The Crack Propagation Behavior In A Metal–Matrix Composite, Chang Ye, Jay Shi, Gary J. Cheng
Dr. Chang Ye
In this paper, the eXtended Finite Element Method (XFEM) was integrated in ABAQUS to simulate crack propagation and to predict the effect of reinforcing particles to the crack propagation behavior of Al2O3/Al6061 composite materials. It has been demonstrated that, higher reinforcing particle volume fraction leads to improved fatigue resistance and smaller particles size is more effective than larger particles at the same particle volume fraction. The underlying mechanisms of these effects are systematically investigated. The stress fields captured by XFEM during the crack propagation help in understanding the crack propagation behavior during cyclic loading.
The Quasi-Static And Cyclic Fatigue Fracture Behavior Of An Emerging Titanium Alloy,
2015
University of Akron, main campus
The Quasi-Static And Cyclic Fatigue Fracture Behavior Of An Emerging Titanium Alloy, Kannan Manigandan, Tirumalai Srivatsan, Gregory Morscher
Dr. Gregory N. Morscher
Sustained research and development efforts culminating in the emergence of new and improved titanium alloys have provided both the impetus and interest for studying their mechanical behavior under the extrinsic influence of loading spanning both static and dynamic. In this article, the quasi-static and cyclic fatigue fracture behavior of a titanium alloy (Ti-Al-V-Fe-O2) is highlighted. Test specimens of this titanium alloy were deformed both in quasi-static tension and cyclic stress amplitude–controlled fatigue. The quasi-static mechanical properties, cyclic fatigue response and microscopic mechanisms contributing to deformation and eventual fracture are highlighted in light of the competing and mutually interactive influences of …
Modeling Of Electromechanical Behavior Of Woven Sic/Sic Composites,
2015
University of Akron, main campus
Modeling Of Electromechanical Behavior Of Woven Sic/Sic Composites, Xhenhai Xia, Thanyawalai Sujidkul, Jianbing Niu, Craig Smith, Gregory Morscher
Dr. Gregory N. Morscher
A coupled electro-mechanical model was developed to predict the mechanical behavior of woven SiC/SiC ceramic matrix composites and electrical resistance response to mechanical damages in the composites. The matrix is explicitly included in the model such that the matrix cracking and fiber break can be linked to the electrical resistance change during loading. The results show that the electrical resistance increases linearly with an increase of matrix crack density and the number of fiber breaks. The predictions are compared to the experimental results on 2D woven SiC/SiC ceramic composites. With proper materials parameters input, the models can accurately predict the …
Electrical Resistance Of Sic Fiber Reinforced Sic/Si Matrix Composites At Room Temperature During Tensile Testing,
2015
University of Akron, main campus
Electrical Resistance Of Sic Fiber Reinforced Sic/Si Matrix Composites At Room Temperature During Tensile Testing, Gregory Morscher, Christopher Baker, Craig Smith
Dr. Gregory N. Morscher
The implementation of Ceramic Matrix Composites necessitates the understanding of stress-dependent damage evolution. Toward this goal, two liquid silicon infiltrated SiCf reinforced SiC composites were tensile tested with electrical resistance (ER) monitoring as well as acoustic emission to quantify matrix cracking. ER was modeled using a combination of resistors in series and parallel to model transverse matrix cracks and fiber/matrix segments between matrix cracks. It is shown that resistance change is sensitive to transverse matrix crack formation and stress-dependent debonding length. The model appears to be accurate up to the stress for matrix crack saturation.
Reduced-Order Multiscale-Multiphysics Model For Heterogeneous Materials,
2015
University of Akron Main Campus
Reduced-Order Multiscale-Multiphysics Model For Heterogeneous Materials, Zheng Yuan, Tao Jiang, Jacob Fish, Gregory Morscher
Dr. Gregory N. Morscher
A unified coupled multiscale mechano-diffusion-reaction model of environmental degradation of polymer matrix composite (PMC) and ceramic matrix composite (CMC) is developed. The unified multiscalemultiphysics model couples multiple physical processes at multiple scales, including oxygen diffusion, oxidation, and deformation. The salient feature of the unified multiscalemultiphysics model is its computational efficiency accomplished through a systematic model reduced carried out prior to nonlinear analysis. The model has been validated for PMR-15 reinforced carbon fiber composite and melt infiltrated CMC-NASA N24A material system.
Experimental And Fem Study Of Thermal Cycling Induced Microcracking In Carbon/Epoxy Triaxial Braided Composites,
2015
University of Akron, main campus
Experimental And Fem Study Of Thermal Cycling Induced Microcracking In Carbon/Epoxy Triaxial Braided Composites, Chao Zhang, Wieslaw Binienda, Gregory Morscher, Richard Martin, Lee Kohlman
Dr. Gregory N. Morscher
The microcrack distribution and mass change in T700s/PR520 and T700s/3502 carbon/epoxy braided composites exposed to thermal cycling was evaluated experimentally. Acoustic emission was utilized to record the crack initiation and propagation under cyclic thermal loading between −55 °C and 120 °C. Transverse microcrack morphology was investigated using X-ray computed tomography. The differing performance of two kinds of composites was discovered and analyzed. Based on the observations of microcrack formation, a meso-mechanical finite element model was developed to obtain the resultant mechanical properties. The simulation results exhibited a decrease in strength and stiffness with increasing crack density. Strength and stiffness reduction …
Correlating Electrical Resistance Change With Mechanical Damage In Woven Sic / Sic Composites: Experiment And Modeling,
2015
University of Akron, main campus
Correlating Electrical Resistance Change With Mechanical Damage In Woven Sic / Sic Composites: Experiment And Modeling, Thanyawalai Sujidkul, Craig Smith, Zhijun Ma, Gregory Morscher, Zhenhai Xia
Dr. Gregory N. Morscher
Silicon carbide (SiC) fiber-reinforced SiC matrix composites are inherently multifunctional materials. In addition to their primary function as a structural material, the electric properties of the SiC/SiC composites could be used for the sensing and monitoring of in situ damage nucleation and evolution. To detect damage and use that information to further predict the useful life of a particular component, it is necessary to establish the relationship between damage and electrical resistance change. Here, two typical SiC/SiC composites, melt infiltrated (MI), and chemical vapor infiltrated (CVI) woven SiC/SiC composites, were tested to establish the relationship between the electrical response and …
Monitoring Interlaminar Crack Growth In Ceramic Matrix Composites Using Electrical Resistance,
2015
University of Akron, main campus
Monitoring Interlaminar Crack Growth In Ceramic Matrix Composites Using Electrical Resistance, Rabih Mansour, Emmanuel Maillet, Gregory Morscher
Dr. Gregory N. Morscher
This letter introduces a method that uses electrical resistance to monitor crack growth during interlaminar fracture testing of woven SiC fiber-reinforced SiC matrix composites at room temperature without visual observation. The estimated crack length is in excellent agreement with the measured length after subtracting a constant value of resistance related to the initial stage of crack development. This non-visual monitoring method holds great promise for in situ measurement of crack growth during high-temperature testing of ceramic matrix composites.
Design Of A Thermally Activated Energy Harvesting System,
2015
University of Akron Main Campus
Design Of A Thermally Activated Energy Harvesting System, D, Quinn, Zachary Toom
Dr. D Dane Quinn
No abstract provided.
Edge Effects In The Energy Dissipation Of Jointed Structures,
2015
University of Akron Main Campus
Edge Effects In The Energy Dissipation Of Jointed Structures, Adam Brink, D, Quinn
Dr. D Dane Quinn
No abstract provided.
Influence Of Charge Transfer Interconnection Topology On State Of Charge Performance In Battery Packs: Simulation Results,
2015
University of Akron Main Campus
Influence Of Charge Transfer Interconnection Topology On State Of Charge Performance In Battery Packs: Simulation Results, D, Quinn, Tom Hartley
Dr. D Dane Quinn
No abstract provided.
Comparing Linear And Essentially Nonlinear Vibration-Based Energy Harvesting,
2015
University of Akron Main Campus
Comparing Linear And Essentially Nonlinear Vibration-Based Energy Harvesting, D, Quinn, Angela Triplett, Lawrence Bergman, Alexander Vakakis
Dr. D Dane Quinn
This work considers the performance of a resonant vibration-based energy harvesting system utilizing a strongly nonlinear attachment. Typical designs serving as the basis for harvesting energy from ambient vibration typically employ a linear oscillator for this purpose, limiting peak harvesting performance to a narrow band of frequencies about the resonant frequency of the oscillator. Herein, in an effort to maximize performance over the broader band of frequency content typically observed in ambient vibration measurements, we employ an essentially nonlinear cubic oscillator in the harvesting device and show that, with proper design, significant performance gains can be realized as compared with …
An Evaluation Of Highered 2.0 Technologies In Undergraduate Mechanical Engineering Courses.,
2015
University of Akron Main Campus
An Evaluation Of Highered 2.0 Technologies In Undergraduate Mechanical Engineering Courses., Amy Orange, Walter Heinecke, Edward Berger, Borjana Mikic, D, Quinn
Dr. D Dane Quinn
No abstract provided.
Effective Stiffening And Damping Enhancement Of Structures With Strongly Nonlinear Local Attachments,
2015
University of Akron Main Campus
Effective Stiffening And Damping Enhancement Of Structures With Strongly Nonlinear Local Attachments, Themistoklis Sapsis, D. Dane Quinn, Alexander Vakakis, Lawrence Bergman
Dr. D Dane Quinn
We study the stiffening and damping effects that local essentially nonlinear attachments can have on the dynamics of a primary linear structure. These local attachments can be designed to act as nonlinear energy sinks (NESs) of shock-induced energy by engaging in isolated resonance captures or resonance capture cascades with structural modes. After the introduction of the NESs, the effective stiffness and damping properties of the structure are characterized through appropriate measures, developed within this work, which are based on the energy contained within the modes of the primary structure. Three types of NESs are introduced in this work, and their …
Design, Simulation, And Large-Scale Testing Of An Innovative Vibration Mitigation Device Employing Essentially Nonlinear Elastomeric Springs,
2015
University of Illinois at Urbana-Champaign
Design, Simulation, And Large-Scale Testing Of An Innovative Vibration Mitigation Device Employing Essentially Nonlinear Elastomeric Springs, Jie Luo, Nicholas Wierschem, Larry Fahnestock, Billie Spencer, Jr., D. Dane Quinn, D. Michael Mcfarland, Alexander Vakakis, Lawrence Bergman
Dr. D Dane Quinn
This study proposes an innovative passive vibration mitigation device employing essentially nonlinear elastomeric springs as its most critical component. Essential nonlinearity denotes the absence (or near absence) of a linear component in the stiffness characteristics of these elastomeric springs. These devices were implemented and tested on a large-scale nine-story model building structure. The main focus of these devices is to mitigate structural response under impulse-like and seismic loading when the structure remains elastic. During the design process of the device, numerical simulations, optimizations, and parametric studies of the structure-device system were performed to obtain stiffness parameters for the devices so …
Magnetic Bearings For Non-Destructive Health Monitoring Of Rotating Machinery Supported In Conventional Bearings,
2015
Virginia Tech
Magnetic Bearings For Non-Destructive Health Monitoring Of Rotating Machinery Supported In Conventional Bearings, M. Kasarda, D, Quinn, T. Bash, D. Inman, R. Kirk, Jerzy Sawicki
Dr. D Dane Quinn
This paper describes initial results from a project expanding the field of rotor health monitoring by using Active Magnetic Bearings (AMBs) as actuators for applying a variety of known force inputs to a spinning rotor in order to monitor and evaluate response signals resulting from these inputs on-line. Similar to modal analysis and other nondestructive evaluation (NDE) techniques which apply input signals to static structures in order to monitor responses; this approach allows for the measurement of both input and output response in a rotating system for evaluation. However, unlike these techniques, the new procedure allows for multiple forms of …
Large-Scale Experimental Evaluation And Numerical Simulation Of A System Of Nonlinear Energy Sinks For Seismic Mitigation,
2015
University of Akron
Large-Scale Experimental Evaluation And Numerical Simulation Of A System Of Nonlinear Energy Sinks For Seismic Mitigation, D, Quinn, Jie Luo, Sean Hubbard, Nicholas Wierschem, Larry Fahnestock, D Mcfarland, Billie Spencer, Alexander Vakakis, Lawrence Bergman
Dr. D Dane Quinn
As a novel dynamic vibration absorber, the nonlinear energy sink has been studied for mitigating structural and mechanical vibration through the last decade. This paper presents a series of large-scale experimental evaluations and numerical simulations on a system of nonlinear energy sink (NES) devices for mitigating seismic structural responses. Two distinct types of NES devices were installed in the top two floors of a large-scale model building structure. In the device system, four Type I NESs employing smooth essentially nonlinear restoring forces were used in conjunction with two single-sided vibro-impact (SSVI) NESs employing non-smooth impact nonlinearities. These NES devices utilize …
Modal Analysis Of Jointed Structures,
2015
University of Akron Main Campus
Modal Analysis Of Jointed Structures, D. Dane Quinn
Dr. D Dane Quinn
Structural systems are often composed of multiple components joined together at localized interfaces. Compared to a corresponding monolithic system these interfaces are designed to have little influence on the load carrying capability of the system, and the resulting change in the overall system mass and stiffness is minimal. Hence, under nominal operating conditions the mode shapes and frequencies of the dominant structural modes are relatively insensitive to the presence of the interfaces. However, the energy dissipation in such systems is strongly dependent on the joints. The microslip that occurs at each interface couples together the structural modes of the system …
