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- W1657307963 abstract "ABSTRACT Preexisting defects and damage under load introduce additional inhomogeneities that make analytical modeling of composite systems difficult. The non-homogeneous and/or anisotropic character of composite behavior is load time history dependent and invalidates many of the testing procedures developed for the more traditional monolithic materials. Composite specimens even though are simplified in terms of loading and geometric configuration respond inherently as structures. The relative response between any two composite systems is case-specific and has to be validated through analysis and experiment. This communication addresses a number of topics that require scrutiny in the prediction of composite material behavior and/or failure. The dominant flaw model can yield useful information in situations where subcritical material damage has a negligible influence on the energy released at incipient fracture. Analytical modeling of interface behavior between fiber and matrix or laminae is not always straightforward because load transmission from one material to another is affected by stress state in addition to being material dependent. Emphasized is the quantitative assessment of the degree of local inhomogeneity which can be measured by fluctuation of the strain energy density function, dW/dV. The local and global stationary values of dW/dV are found not only useful for identifying the sites of possible failure and yielding but also the stability of composite systems that depends on the combination of loading, geometry and material inhomogeneity. Composites being vulnerable to aggressive environmental changes can behave very differently when the moisture and temperature conditions are altered. Results are presented for a crack in T300/5208 graphite fiber laminate subjected to moisture, temperature and stress boundary conditions. These influences can, in general, be coupled and lead to failure modes that are not intuitively obvious." @default.
- W1657307963 created "2016-06-24" @default.
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- W1657307963 date "1984-01-01" @default.
- W1657307963 modified "2023-09-27" @default.
- W1657307963 title "ANALYSIS OF DEFECTS AND DAMAGE IN COMPOSITES" @default.
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- W1657307963 doi "https://doi.org/10.1016/b978-1-4832-8440-8.50040-5" @default.
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