Topic
Stress relaxation
About: Stress relaxation is a research topic. Over the lifetime, 12959 publications have been published within this topic receiving 270815 citations.
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TL;DR: In this paper, a pyramidal glide of half loops on the 1∕3⟨1123⟩∕{1122} slip system was shown to be a well-known secondary slip system in hcp metals.
Abstract: Heteroepitaxial growth of AlxGa1−xN alloy films on GaN results in large tensile strain due to the lattice mismatch. During growth, this strain is partially relieved both by crack formation and by the coupled introduction of dense misfit dislocation arrays. Extensive transmission electron microscopy measurements show that the misfit dislocations enter the film by pyramidal glide of half loops on the 1∕3⟨1123⟩∕{1122} slip system, which is a well-known secondary slip system in hcp metals. Unlike the hcp case, however, where shuffle-type dislocations must be invoked for this slip plane, we show that glide-type dislocations are also possible. Comparisons of measured and theoretical critical thicknesses show that fully strained films can be grown into the metastable regime, which we attribute to limitations on defect nucleation. At advanced stages of relaxation, interfacial multiplication of dislocations dominates the strain relaxation process. This work demonstrates that misfit dislocations are important mec...
120 citations
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120 citations
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TL;DR: The GLOSS analysis is emerging as a useful technique for determining multiaxial stress relaxation, follow-up, creep damage, inelastic strain concentrations and low-cycle fatigue estimates, limit analysis and issues pertaining to stress classification as discussed by the authors.
Abstract: The underlying theory relates redistribution of inelastic stresses at a given location under consideration to the uniaxial stress relaxation process. GLOSS analysis is emerging as a useful technique for determining multiaxial stress relaxation, follow-up, creep damage, inelastic strain concentrations and low-cycle fatigue estimates, limit analysis and issues pertaining to stress-classification
119 citations
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TL;DR: The results show that the mechanical behaviour of MCF-7 cells responds to a two-layered model of similar elasticity but differing viscosity, which constitutes a unique AFM-based experimental framework to study cell mechanics.
Abstract: In this work we present a unified method to study the mechanical properties of cells using the atomic force microscope Stress relaxation and creep compliance measurements permitted us to determine, the relaxation times, the Young moduli and the viscosity of breast cancer cells (MCF-7) The results show that the mechanical behaviour of MCF-7 cells responds to a two-layered model of similar elasticity but differing viscosity Treatment of MCF-7 cells with an actin-depolymerising agent results in an overall decrease in both cell elasticity and viscosity, however to a different extent for each layer The layer that undergoes the smaller decrease (36-38%) is assigned to the cell membrane/cortex while the layer that experiences the larger decrease (70-80%) is attributed to the cell cytoplasm The combination of the method presented in this work, together with the approach based on stress relaxation microscopy (Moreno-Flores et al 2010 J Biomech 43 349-54), constitutes a unique AFM-based experimental framework to study cell mechanics This methodology can also be extended to study the mechanical properties of biomaterials in general
119 citations
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TL;DR: In this paper, the authors model the strain relaxation using continuum strain theory and predict that the scroll diameter depends on the winding direction if the cubic symmetry of zinc blende semiconductors is taken into account, 〈100〉 being the preferred winding direction.
Abstract: Nanoscrolls develop when thin, strained semiconductor multilayers are peeled off from their substrate. We model the strain relaxation using continuum strain theory and predict that the scroll diameter depends on the winding direction if the cubic symmetry of zinc blende semiconductors is taken into account, 〈100〉 being the preferred winding direction. The effects of nonlinear strain and third order elastic coefficients are considered, the latter leading to smaller scroll diameter.
119 citations