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, the deformation and failure processes occurring in polymer bonded explosives (PBX-1) and other energetic materials is of great importance for processing methods and lifetime storage purposes.
59 citations
TL;DR: In this article, the authors study the convergence of both responses in antiplane elasticity of sheets with non-periodic, random distributions of thin needle-shaped inclusions and show that, with the needles' stiffness decreasing and their slenderness growing, the RVE tends to be very large.
59 citations
Journal Article•
TL;DR: In this article, the response of open-cell polyurethane (PU) foams was measured in compression, simple shear and combinations thereof, using one or two moduli.
Abstract: The response of open-cell polyurethane (PU) foams was measured in compression, simple shear and combinations thereof. The data was fitted with Ogden's strain energy function for compressible hyperelastic solids, using one or two moduli. The Ogden function is also compared with the predictions of a micromechanics model. Finite Element Analysis (FEA) was used to predict the foam response for both plane strain indentation and the axisymmetric Indentation Force Deflection (IFD) test. Experimental deformation patterns and pressure distributions validate the predictions. The predicted relative indentation forces are about 20% less than the experimental values. Test piece geometry is shown to affect the IFD values, and interface friction to affect the deformation pattern.
59 citations
TL;DR: In this paper, the authors proposed a modeling of electroelastic composite materials based on four interaction tensors related to Eshelby's tensors for ellipsoidal inclusions, which are basically used to derive the self-consistent model, Mori-Tanaka and dilute approaches.
59 citations
TL;DR: In this article, the authors measured fiber displacements, measured through small port holes in the matrix made by electropolishing, to determine fiber stresses, which ranged from 1.1 to 4 GPa.
Abstract: Micromechanics parameters for fatigue cracks growing perpendicular to fibers were measured for the center-notched specimen geometry. Fiber displacements, measured through small port holes in the matrix made by electropolishing, were used to determine fiber stresses, which ranged from 1.1 to 4 GPa. Crack opening displacements at maximum load and residual crack opening displacements at minimum load were measured. Matrix was removed along the crack flanks after completion of the tests to reveal the extent and nature of the fiber damage. Analyses were made of these parameters, and it was found possible to link the extent of fiber debonding to residual COD and the shear stress for fiber sliding to COD. Measured experimental parameters were used to compute crack growth rates using a well-known fracture mechanics model for fiber bridging tailored to these experiments.
59 citations