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- W2017813287 abstract "A micromechanical theory is developed for the constitutive analysis of pure initially uncracked polycrystalline solids at non-elevated temperatures. The development of the theory is based upon the Zener-Stroh theory of microfracture. It is considered that under increasingly applied stresses, a polycrystalline solid is continuously subjected to isotropic microcrack nucleation. A material constant is introduced which is equal to the ratio of the microcrack density to the concentration of the nucleated microcracks and is believed to characterize the extent of defect structure in the polycrystalline solid. The proposed global criterion for microcrack nucleation is that the resolved shear stress on the plane of dislocation pile-up must reach a nucleation stress, which is the shear stress on the most favorably oriented slip plane in the largest grain in the polycrystalline solid. Continuous microcrack nucleation is, therefore, based upon a microcracking hardening principle. It is suggested here that under uniaxial tensile loading, a Zener-Stroh microcrack is stopped at a grain boundary and undergoes interfacial displacement jumps, which contributes to the overall inelastic strains in the polycrystalline solid. It is shown that free-slipping has a significant effect on the overall inelastic strains and that the magnitude of inelastic strain due to microcracking is proportional to the third power of the average grain diameter. Due to the limited number of available close-packed slip systems in HCP beryllium and because the primary slip planes are non-intersecting in nature, cross-slip is often avoided and the initial microplastic strain field gives rise to slip-induced microcracking. The validity of the proposed theory is, therefore, checked against the experimentally obtained results of Mayville and Finnie on S-65 beryllium. Excellent agreement is found between the experimentally measured, and theoretically calculated values of the inelastic strain due to microcracking under uniaxial tensile loading." @default.
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- W2017813287 date "1989-01-01" @default.
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- W2017813287 title "A micromechanical model of microcracking for brittle polycrystalline solids" @default.
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- W2017813287 doi "https://doi.org/10.1016/0013-7944(89)90201-4" @default.
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