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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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59 citations
TL;DR: In this paper, the constitutive behavior of fiber reinforced concrete (FRC) is investigated within a micromechanical framework, where the linear elastic behavior is first examined by implementation of a Mori-Tanaka homogenization scheme.
59 citations
TL;DR: In this paper, the effects of cyclic interface degradation on fiber bridging of fatigue cracks in metal-matrix or intermetallic matrix composites are examined. And the results are used to demonstrate that a reduction of the interface friction stress by fatigue can lead to a decrease of the bridging stress and an increase in the near-tip stress intensity range.
Abstract: This paper presents a theoretical analysis that examines the effects of cyclic degradation of interface on fiber bridging of fatigue cracks in metal-matrix or intermetallic-matrix composites. Using fiber bridging models and crack-tip micromechanics results available in the literature, the frictional stresses on individual fiber/matrix interfaces located within the bridging zone in the wake of a fatigue crack in a SCS-6/Ti-6Al-4V composite are calculated. The results are used to demonstrate that a reduction of the interface friction stress by fatigue can lead to a decrease of the fiber bridging stress, and an increase in the near-tip stress intensity range. The consequence is that the near-tip stress intensity range and, thus, the crack growth of a bridged fatigue crack are sensitive to cyclic interface degradation and the distribution of the frictional stress within the bridged zone.
59 citations
TL;DR: In this paper, the deformation response of rigid polyurethane foam to tension was investigated and microstructural features such as the size and geometry of constituent cells and the struts that define the cell edges, as well as their stiffness and tensile strength, were examined.
Abstract: An understanding of the mechanical properties of solid foams facilitates effective use of such materials, which are often deployed in load-bearing applications such as impact absorbers, cushioning and sandwich structures. This study is an experimental investigation that focuses on the deformation response of rigid polyurethane foam to tension. Microstructural features such as the size and geometry of constituent cells and the struts that define the cell edges, as well as their stiffness and tensile strength, are examined. The nature of cell deformation and fracture are identified through microscopy and the associated micromechanics analyzed. Results show that the cells are elongated and thus the foam exhibits anisotropic properties. Flexure of the struts that define the cell edges is the primary mechanism governing deformation and failure. Information on the mechanical, microstructural and deformation characteristics elicited through this investigation will facilitate formulation of idealized cell-based models to account for the mechanical response of rigid polymeric foams.
59 citations