Topic
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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01 Mar 2012
46 citations
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TL;DR: In this paper, a micromechanics-based elastoplastic damage model for quasi-brittle rocks under a compressive stress state is presented, where the plastic strain is considered to be related to frictional sliding along micro-cracks, and it is coupled inherently with damage evolution.
46 citations
01 Jan 2015
TL;DR: In this article, a computational micromechanics modeling approach is presented to predict the dynamic modulus of asphalt concrete mixtures using a finite element method combined with the micromachanical representative volume element of mixtures and laboratory tests that characterize the properties of individual mixture constituents.
Abstract: This paper presents a computational micromechanics modeling approach to predict the dynamic modulus of asphalt concrete mixtures. The modeling uses a finite element method combined with the micromechanical representative volume element (RVE) of mixtures and laboratory tests that characterize the properties of individual mixture constituents. The model treats asphalt concrete mixtures as heterogeneous with two primary phases: a linear viscoelastic fine aggregate matrix (FAM) phase and a linear elastic aggregate phase. The mechanical properties of each phase were experimentally obtained by conducting constitutive tests: oscillatory torsion tests for the viscoelastic FAM phase and quasistatic nanoindentation tests for the elastic aggregate particles. Material properties of each mixture phase were then used in the finite element simulation of two-dimensional mixture microstructures obtained from digital image processes of asphalt concrete mixtures. Model simulations were compared with the experimental dynamic...
45 citations
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TL;DR: Cohesive Zone Models (CZMs) are increasingly being used to simulate fracture and fragmentation processes in metallic, polymeric, ceramic materials, and composites thereof as discussed by the authors, and a key feature of this approach is to represent the micromechanics of the fracture processes through a unique load displacement relation.
Abstract: Cohesive Zone Models (CZMs) are increasingly being used to simulate fracture and fragmentation processes in metallic, polymeric, ceramic materials, and composites thereof. A key feature of this approach is to represent the micromechanics of the fracture processes through a unique load-displacement relation. Most researchers consider magnitude of the energy, in addition to one of the two parameters (cohesive strength or critical displacement), to define the cohesive zone characteristics, ignoring the actual form (shape) of the relationship. Some of our recent work [1–3] and the work of others [17] has clearly shown that the energetics of the fracture process not only depends on the inelastic constitutive equation of the bounding material, but also on the choice of the cohesive zone model. CZM represents the embodiment of different inelastic micromechanisms active in the fracture process zone (FPZ). Since the micromechanisms are fundamental material characteristics, the choice of the CZM should dep...
45 citations