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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TL;DR: In this paper, a micromechanics model is developed which predicts the effective thermal conductivity and estimates the local fields of such composites which may be subjected to uniform heat fluxes on its boundary.
Abstract: The present paper is concerned with coated‐fiber composites in which the fibers possess cylindrical orthotropy and may have an arbitrary orientation distribution. A micromechanics model is developed which predicts the effective thermal conductivity and estimates the local fields of such composites which may be subjected to uniform heat fluxes on its boundary. The micromechanics model is based on the Mori–Tanaka mean‐field concept [T. Mori and K. Tanaka, Acta Metall. 21, 571 (1973)] and provides explicit expressions for the effective conductivity of the considered composite aggregate which is highly complicated. The analysis shows that special care is needed in formulating an effective theory of composites with constituents possessing curvilinear anisotropy.
65 citations
TL;DR: In this article, a 3D micromechanical study has been performed in order to investigate local damage in UD composite materials under transverse and longitudinal tensile loading, in particular, the influence of non-uniform distribution of fibres in RVEs with a hexagonal packing array and the effects of thermal residual stresses has been investigated.
Abstract: A three dimensional (3D) micromechanical study has been performed in order to investigate local damage in UD composite materials under transverse and longitudinal tensile loading. In particular, the influence of non-uniform distribution of fibres in RVEs (representative volume element) with a hexagonal packing array and the effects of thermal residual stresses has been investigated. To examine the effect of inter-fibre spacing and residual stress on failure, a study based on the Maximum Principal Stress failure criterion and a stiffness degradation technique has been used for damage analysis of the unit cell subjected to mechanical loading. Results indicate a strong dependence of damage onset and its evolution from the fibres position within the RVE. Predicted mechanical properties, damage initiation and evolution are also clearly influenced by the presence of residual stress.
65 citations
TL;DR: In this article, the elastic constants of a lotus-type porous copper composite material were determined using a combination of resonance ultrasound spectroscopy and electromagnetic acoustic resonance methods, and it was shown that the elastic properties of various types of porous metals can be predicted and designed using micromechanics modeling.
65 citations
TL;DR: In this paper, carbon fiber reinforced polymer (CFRP) lattice structures have been made from balanced [0/90] CFRP laminates using a simple snap-fit method and their moduli and strengths have been measured during free compressions as a function of the lattice relative density.
65 citations
TL;DR: In this article, the effects of inclusion waviness and its distribution on the effective composite stiffness were investigated, and the authors showed that the disparity between theoretical predictions and experimental data could be due to different inclusion wAViness conditions.
Abstract: In this study we investigated the effects of inclusion waviness and its distribution to the effective composite stiffness. Different waviness conditions were analyzed: uniform waviness with variable inclusion orientation or aspect ratio, and uniform aspect ratio with variable waviness. The inclusion waviness was found to have a greater effect on tensile moduli and shear modulus for unidirectional composites; however, if the inclusions are either randomly dispersed or partially aligned, the degree of waviness effect was smaller. The elastic moduli were also over-estimated if inclusion aspect ratio or waviness followed symmetric distributions. In addition, the waviness distribution effect was larger when larger inclusion waviness was introduced in a composite. The lack of fiber waviness distribution assumption was found to lead to inaccurate composite stiffness predictions, especially for composite with higher fiber volume fraction. We also demonstrated the inclusion waviness effects on the tensile modulus of carbon nanotube-reinforced composites. The results showed that the disparity between theoretical predictions and experimental data could be due to different inclusion waviness conditions.
65 citations