@article{ziaei_wu_fitch_elbadry_zikry_2019, title={Channel Cracking and Interfacial Delamination of Indium Tin Oxide (ITO) Nano-Sized Films on Polyethylene Terephthalate (PET) Substrates: Experiments and Modeling}, volume={59}, ISSN={["1741-2765"]}, url={http://dx.doi.org/10.1007/s11340-019-00534-y}, DOI={10.1007/s11340-019-00534-y}, abstractNote={Our research objective was to obtain a fundamental understanding of how ITO thin films layered on flexible polyethylene terephthalate (PET) substrates fail due to tensile, shear, and bending loading conditions. In our approach, we employed a nonlinear finite-element (FE) approach coupled with dislocation-density crystalline and hypoelastic material models and fracture approaches tailored for channel (film) cracking and interfacial delamination. These predictions were validated with mechanical experiments and characterization at different physical scales. Failure to strain and fracture predictions were used to account for interrelated mechanisms, such as channel and interfacial cracking nucleation and propagation along cleavage planes, interfaces, and within layers. Our predictions indicate that interfacial delamination occurred when channel cracks transitioned to interfacial cracks at the ITO/PET interface for tensile loading conditions. Furthermore, the thin film system, when subjected to three-point bending and shear loading conditions was more resistant to failure in comparison to systems subjected to tensile loading conditions.}, number={5}, journal={EXPERIMENTAL MECHANICS}, publisher={Springer Science and Business Media LLC}, author={Ziaei, S. and Wu, Q. and Fitch, J. and Elbadry, M. and Zikry, M. A.}, year={2019}, month={Jun}, pages={703–712} }
 @article{ziaei_zikry_2019, title={How semi-coherent b.c.c. hydride interfacial interactions affect the inelastic deformation and fracture behavior of h.c.p. zirconium alloys}, volume={130}, ISSN={["1872-7743"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85059460310&partnerID=MN8TOARS}, DOI={10.1016/j.mechmat.2018.12.015}, abstractNote={We analyzed how b.c.c. semi-coherent interfaces, within an h.c.p. matrix, have a central effect on the fracture of these multi-phase aggregates. We obtained 36 unique Orientation Relations (ORs) related to semi-coherent interfaces between the hydrides and the parent matrix, and calculated interfacial misfit strains between the matrix and hydride crystalline structures. We then coupled these microstructural interactions to a dislocation-density framework with a fracture nucleation and propagation approach to understand and predict different failure scenarios. The analysis indicates that misfit strains have a dominant mechanistic effect that is essential for an understanding of multi-phase crystalline aggregate behavior that spans different length scales.}, journal={MECHANICS OF MATERIALS}, author={Ziaei, S. and Zikry, M. A.}, year={2019}, month={Mar}, pages={1–8} }
 @article{hasan_ziaei_zikry_2019, title={Microstructural Modeling of the Mechanical Behavior of Face-Centered Cubic Nanocrystalline-Twinned Systems}, volume={50A}, ISSN={["1543-1940"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85056852998&partnerID=MN8TOARS}, DOI={10.1007/s11661-018-5008-2}, number={2}, journal={METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE}, author={Hasan, Tamir S. and Ziaei, S. and Zikry, M. A.}, year={2019}, month={Feb}, pages={609–615} }
 @article{ziaei_zikry_2016, title={The effects of twins on the large strain deformation and fracture of hexagonal close packed crystalline materials}, volume={120}, ISSN={["1873-2453"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84986587922&partnerID=MN8TOARS}, DOI={10.1016/j.actamat.2016.08.059}, abstractNote={We investigated how twin modes in hexagonal close packed materials can affect large inelastic strain behavior and fracture. We considered the two twin mode systems of (112¯1)[1¯1¯26] and (0001) [1¯1¯20] in zircaloy-2, with each mode having 24 unique twin systems. We then incorporated these twin and parent slip systems with a dislocation-density crystalline plasticity, a non-linear finite-element, and fracture framework that accounts for crack nucleation and propagation. We investigated how these twin modes affect the interrelated effects of crack nucleation and propagation, dislocation density and inelastic slip evolution, stress accumulation, and lattice rotation. The predictions indicate that twin modes significantly affect local deformation and fracture behavior, and, therefore, are essential for the accurate representation of behavior at different physical scales in heterogeneous crystalline hexagonal close packed systems.}, journal={ACTA MATERIALIA}, author={Ziaei, S. and Zikry, M. A.}, year={2016}, month={Nov}, pages={435–442} }
 @article{ziaei_zikry_2015, title={Modeling the Effects of Dislocation-Density Interaction, Generation, and Recovery on the Behavior of HCP Materials}, volume={46A}, ISSN={["1543-1940"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84940718705&partnerID=MN8TOARS}, DOI={10.1007/s11661-014-2635-0}, number={10}, journal={METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE}, author={Ziaei, S. and Zikry, M. A.}, year={2015}, month={Oct}, pages={4478–4490} }
 @article{ziaei_wu_zikry_2015, title={Orientation relationships between coherent interfaces in hcp-fcc systems subjected to high strain-rate deformation and fracture modes}, volume={30}, ISSN={["2044-5326"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84939515483&partnerID=MN8TOARS}, DOI={10.1557/jmr.2015.207}, abstractNote={We investigated how coherent interfaces, between face centered cubic (fcc)/hexagonal close packed (hcp) systems, affect large strain deformation and fracture modes in hcp zircaloy aggregates with fcc hydrides. We derived 36 unique transformations related to coherent interfaces between fcc and hcp systems. We then used these orientation relations (ORs) with a dislocation-density crystalline plasticity formulation, a nonlinear finite-element, and a fracture approach that account for crack nucleation and propagation. We investigated how these ORs affect crack nucleation and propagation, dislocation density and inelastic slip evolution, stress accumulation, lattice rotation, and adiabatic heating. The predictions indicate that the physical representation of ORs affects local deformation and fracture behavior and are, therefore, essential for the accurate predictions of behavior at different physical scales in heterogeneous crystalline systems.}, number={15}, journal={JOURNAL OF MATERIALS RESEARCH}, author={Ziaei, Shoayb and Wu, Qifeng and Zikry, Mohammed A.}, year={2015}, month={Aug}, pages={2348–2359} }