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Micromechanics
About: Micromechanics is a research topic. Over the lifetime, 6000 publications have been published within this topic receiving 162635 citations.
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TL;DR: In this article, a new generic approach to achieving large strains in materials with high elastic moduli (5-30 GPa) was proposed, based on creating variable stiffness composite materials which exhibit a controllable change in elastic modulus (bending or axial) and large reversible strain accommodation.
Abstract: Reconfigurable and morphing structures may provide a range of new functionalities such as optimization over broad operational conditions and multi-mission capability. This article introduces a new generic approach to achieving large strains in materials with high elastic moduli (5-30 GPa). The work centers on creating variable stiffness composite materials which exhibit a controllable change in elastic modulus (bending or axial) and large reversible strains (5-15%). We have performed a simulation study to better understand the implication of various geometric design parameters on the elastic and deformation behavior. Using this information, a series of prototype materials were prepared using a commercial shape memory polymer, and measurements on these materials indicate a controllable change in stiffness as a function of temperature with large reversible strain accommodation. We have fabricated and tested several design variations of laminar morphing materials which exhibit structural stiffness values of ...
87 citations
TL;DR: In this article, a lattice-based micromechanics approach is proposed to characterize the cracking performance of asphalt concrete and a random truss lattice model is introduced and investigated for simulating the following: linear elastic and visco-elastic deformation of homogeneous materials in axial compression and shear loading experiments, linear elastic deformation and the stress field in heterogeneous materials, and damage evolution in elastic solids under an indirect tensile test.
Abstract: A lattice-based micromechanics approach is proposed to characterize the cracking performance of asphalt concrete. A random truss lattice model was introduced and investigated for simulating the following: (a) linear elastic and viscoelastic deformation of homogeneous materials in axial compression and shear loading experiments, (b) linear elastic deformation and the stress field in heterogeneous materials in an axial compression loading experiment, and (c) damage evolution in elastic solids under an indirect tensile test. The simulation results match well with the theoretical solutions and show excellent promise in predicting cracking patterns in the indirect tensile test. A brief discussion about ongoing work is also presented.
87 citations
TL;DR: In this paper, the authors focus on the modelling of interfacial debonding effects on the overall behavior of randomly oriented discontinuous-fibre composites containing matrix microcracks.
87 citations
TL;DR: In this article, the effect of the statistical variability of fiber strengths, viscosity of the polymer matrix as well as the interaction between the damage processes in matrix, fibers and interface are investigated numerically.
87 citations
TL;DR: In this paper, the density distribution of geometrically necessary dislocations, which accompany the gradient of plastic slip strain on slip systems, is evaluated by a finite-element technique.
Abstract: The density distribution of geometrically necessary dislocations, which accompany the gradient of plastic slip strain on slip systems, is evaluated by a finite-element technique. As a numerical example, the bending of a single-crystal plate is analysed. The result obtained for the density distribution of dislocations shows good agreement with that obtained by micromechanics theory.
87 citations