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Full-Text Articles in Engineering
Screw Dislocation Interacting With Twin Interfacial Edge Cracks Between Two Bonded Dissimilar Piezoelectric Strips, Xiangfa Wu, Yuris A. Dzenis, Tian-You Fan
Screw Dislocation Interacting With Twin Interfacial Edge Cracks Between Two Bonded Dissimilar Piezoelectric Strips, Xiangfa Wu, Yuris A. Dzenis, Tian-You Fan
Department of Engineering Mechanics: Faculty Publications
This paper is concerned with the electroelastic potentials and the fracture parameters of a twin-edge-cracked piezoelectric bimaterial strip with a screw dislocation. By means of conformal mapping technique and the known dislocation solution, the antiplane displacement and inplane electric potentials are obtained in closed-form. The intensity factors and the energy release rate are extracted explicitly. In some limiting cases, the present solutions cover those in the literature.
Method For Performing Accelerated Characterization Of Viscoelastic Constitutive Behavior Of Asphaltic Concrete, Curtis Berthelot, D. H. Allen, Chad Searcy
Method For Performing Accelerated Characterization Of Viscoelastic Constitutive Behavior Of Asphaltic Concrete, Curtis Berthelot, D. H. Allen, Chad Searcy
Department of Engineering Mechanics: Faculty Publications
Constitutive models based in continuum mechanics are formulated for modeling the time dependent mechanical re¬sponse of asphaltic concrete. The model chosen for the initial phase of study is linear viscoelastic, resulting in stress-strain re¬lations that are of the single integral Boltzmann type in time. Experimental equipment and testing protocols are described for obtaining material properties within the viscoelastic framework selected for characterization. A frequency sweep experimental technique is described for obtaining composite properties from short-term tests that can be used to predict long-term, time-depen¬dent material behavior. Mathematical techniques are described for converting experimentally obtained complex compliances to creep compliances and …
Two Semi-Infinite Interfacial Cracks Between Two Bonded Dissimilar Elastic Strips, Xiangfa Wu, Yuris A. Dzenis, Tian-You Fan
Two Semi-Infinite Interfacial Cracks Between Two Bonded Dissimilar Elastic Strips, Xiangfa Wu, Yuris A. Dzenis, Tian-You Fan
Department of Engineering Mechanics: Faculty Publications
The complex stress intensity factor and energy release rate are obtained for two semi-infinite interfacial cracks between two bonded dissimilar elastic strips with equal thickness under inplane deformations. During the procedure, by means of conformal mapping technique, the mixed boundary-value problem is reduced to a standard Riemann–Hilbert problem, which is further solved in closed-form. In some limiting cases, the present explicit solutions can cover the well-known results in the literature.
Moving Screw Dislocations In Piezoelectric Bimaterials, Xiangfa Wu, Yuris A. Dzenis, Wen-Sheng Zou
Moving Screw Dislocations In Piezoelectric Bimaterials, Xiangfa Wu, Yuris A. Dzenis, Wen-Sheng Zou
Department of Engineering Mechanics: Faculty Publications
An explicit solution for a moving screw dislocation in a piezoelectric bimaterial is given by means of complex variables. The electroelastic fields and forces acting on the moving dislocation are obtained in closed form. As special cases, solutions for a moving screw dislocation in a piezoelectric half-plane with a free or rigid surface are obtained explicitly.
Interfacial Edge Crack Between Two Bonded Dissimilar Orthotropic Strips Under Antiplane Point Loading, Xiangfa Wu, Yuris A. Dzenis, Wen-Sheng Zou
Interfacial Edge Crack Between Two Bonded Dissimilar Orthotropic Strips Under Antiplane Point Loading, Xiangfa Wu, Yuris A. Dzenis, Wen-Sheng Zou
Department of Engineering Mechanics: Faculty Publications
A closed-form solution is obtained for the interfacial edge crack between two bonded dissimilar orthotropic strips loaded by antiplane point loading in form of screw dislocation or line force. Conformal mapping and existing dislocation solutions are utilized for constructing the fundamental solution of the problem. The stress intensity factor (SIF) and the energy release rate(ERR) are obtained explicitly.
Paper On Measurement Of The Nanomechanical Properties Of Thin Films Using Afam Receives Recognition, Donna Hurley, Joseph A. Turner, Paul Rice, Joshua Wiehn
Paper On Measurement Of The Nanomechanical Properties Of Thin Films Using Afam Receives Recognition, Donna Hurley, Joseph A. Turner, Paul Rice, Joshua Wiehn
Department of Engineering Mechanics: Faculty Publications
NIST researchers are developing atomic force acoustic microscopy (AFAM) methods to quantitatively determine the elastic properties of thin films. The AFAM technique measures the frequencies of an atomic force microscope (AFM) cantilever’s first two flexural resonances while in contact with a material. The indentation modulus, M, of an unknown or test material can then be obtained by comparing the resonant spectra of the test material to those of a reference material. To examine metrology issues for this emerging technique, AFAM results have been compared with those obtained by other methods, such as instrumented indentation. The results show that better agreement …
Screw Dislocation Interacting With Interface And Interfacial Cracks In Piezoelectric Bimaterials, Xiangfa Wu, Steve Cohn, Yuris A. Dzenis
Screw Dislocation Interacting With Interface And Interfacial Cracks In Piezoelectric Bimaterials, Xiangfa Wu, Steve Cohn, Yuris A. Dzenis
Department of Engineering Mechanics: Faculty Publications
Interface and interfacial cracks interacting with screw dislocations in piezoelectric bimaterials subjected to antiplane mechanical and in-plane electrical loadings are studied within the framework of linear piezoelectricity theory. Straight dislocations with the Burgers vector normal to the isotropic basal plane near the interface or interfacial crack are considered. The dislocations are characterized by a discontinuous electric potential across the slip plane and are subjected to a line-force and a line-charge at the core. An explicit solution for the screw dislocation in piezoelectric bimaterial with straight interface is found based on the solution of a similar problem for infinite homogenous medium. …