Computational assessment of composite structure weaknesses in short-fiber reinforced MMCs

Li, Xudong

doi:10.1016/s0167-6636(02)00093-5

Cited by 2 publications

(1 citation statement)

References 47 publications

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“…Nevertheless, from a viewpoint of microstructure characterization, local microstructural details in both geometry and crystallographic orientation must be available during simulation, sufficient enough for statistical analyses and ready for presentations of local microstructure. The philosophy innovated in microstructure modeling at the material size of mesoscopic scale is that local geometries and orientations of material constituents, rather than simplified microstructure as a whole, determine local responses [1,13] and hence the size of representative volume element of the microstructure. Obviously, this requires one to imitate geometric profile of local microstructure details in a visualized manner when generating the microstructure.…”

Section: Discussion and Softwarementioning

confidence: 99%

Visualized simulation and modularized architecture of microstructures for composite materials

Li¹

2005

Composite Interfaces

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This article presents a novel and mature framework of technical procedures to construct a set of computer-imitated microstructure entities for simulating real microstructure of composite materials. The computer simulation respects not only the similitude of geometry but also analogy of orientations of material constituents available in real composite materials. Two proposed methods to copy a microstructure from a real one or an invented one are introduced in detail. The great importance of visualized simulation and modularized architecture of microstructures is especially elucidated with emphases on how geometric entities and orientational identities of a computergenerated microstructure can be altered, manipulated and combined so as to create an invented microstructure in terms of prescribed demands. The article illustrates that making basic microstructure modules is vital to microstructure architecture. It is also demonstrated by a number of vivid figures that one can make elaborately invented composite microstructures by combining basic modules of different types. The article concludes that with an increase of demands for advanced materials and demands for precise prediction of material properties the development of microstructure designing and tailoring is more and more toward local geometry-orientation-based microstructure construction rather than overall-based microstructure imitation. Software, namely ProDesign, has been developed for the visualized simulation and modularized architecture of microstructure of composite material samples. The software may provide one with a tool of versatile functionality for computer-based microstructure designing, tailoring and experiments toward property-oriented architecture.

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Section: Discussion and Softwarementioning

confidence: 99%

Visualized simulation and modularized architecture of microstructures for composite materials

Li¹

2005

Composite Interfaces

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K Variations and Anisotropy: Microstructure Effect and Numerical Predictions

Li¹

2002

Journal of Engineering Materials and Technology

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Computer experiments were performed on simulated polycrystalline material samples that possess locally anisotropic microstructures to investigate stress intensity factor (K) variations and anisotropy along fronts of microcracks of different sizes. The anisotropic K, arising from inhomogeneous stresses in broken grains, was determined for planar microcracks by using a weight function-based numerical technique. It has been found that the grain-orientation-geometry-induced local anisotropy produces large variations in K along front of microcracks, when the crack size is of the order of few grain diameters. Synergetic effect of grain orientation and geometry of broken grains control K variations and evolution along the microcrack front. The K variations may diminish at large crack sizes, signifying a shift of K calculation to bulk stress dependence from local stress dependence. Local grain geometry and texture may lead to K anisotropy, producing unusually higher/ lower K at a segment of the crack front. Either K variation or anisotropy cannot be ignored when assessing a microcrack.

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Computational assessment of composite structure weaknesses in short-fiber reinforced MMCs

Cited by 2 publications

References 47 publications

Visualized simulation and modularized architecture of microstructures for composite materials

Visualized simulation and modularized architecture of microstructures for composite materials

K Variations and Anisotropy: Microstructure Effect and Numerical Predictions

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