By Jacob Aboudi (auth.), Jean-Paul Boehler, Akhtar S. Khan (eds.)

Present advancements in fabrics technological know-how, mechanics and engineering, in addition to the calls for of contemporary expertise, bring about a brand new and becoming curiosity in plasticity and in bordering domain names of the mechanical habit of fabrics. This starting to be curiosity is attested to via the good fortune of either The overseas magazine of Plasticity, which after its inception quickly turned the best magazine for plasticity learn, and the sequence ofInternational Symposia on Plasticity and Its present functions, that's now the foremost foreign discussion board for plasticity study dissemination. the 1st overseas Symposium on Plasticity and Its present purposes was once conceived and arranged by means of Professor Akhtar S. Khan, and was once held on the collage of Oklahoma (Norman, Oklahoma, united states) from July 30 to August three, 1984. It was once attended through over 100 scientists from fifteen international locations. "Plasticity '89: the second one overseas Symposium on Plasticity and Its present functions" used to be held at Mie college (Tsu, Japan) from July 31 to August four, 1989; this symposium was once co-chaired by means of Professors Khan and Tokuda. the most emphasis of this assembly used to be on dynamic plasticity and micromechanics, even though it incorporated different points of plasticity to boot. It was once attended via over 200 researchers from twenty-three nations.

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Additional info for Anisotropy and Localization of Plastic Deformation: Proceedings of PLASTICITY ’91: The Third International Symposium on Plasticity and Its Current Applications

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CONCLUSION It has been observed experimentally that microstructural damage and instability are dependent on the number of plies in unidirectional metal matrix laminates [3]. Although previous elastic stress analysis [1] has failed to account for this discrepancy, the current 13 research predicts substantial differences in the interfacial stresses between fiber and matrix in one-, two-, and three-ply laminates, thus supporting the contention the inelasticity in the matrix is a significant contributor to the variation in stresses near a free surface.

Results are obtained for both effective properties and fiber-matrix interfacial stresses as functions of number of plies. The details of this analysis are described below. ANALYSIS The computational model utilizes the finite element code NONPLAS developed at Texas A&M University for analysis of elastic-plastic media [8]. The code contains constitutive packages for both elastic and rate independent elastic-plastic media. The plasticity model assumes isotropic material behavior and employs the Prandtl-Reuss equations in conjunction with the Von Mises yield criterion and a combined hardening rule to account for yield surface expansion and translation [8].

The elastic part is assumed to be related to the stress-rate Q: (suitably defined) according to the orthotropic elastic stress-strain relations e d 11 SIlO- II + S 120- 22 + S 1 30- 33 e d 22 S 120- 11 + S 220- 22 + S 2 30- 33 e d 33 S 130- 11 + S 2 30- 22 + S 3 30- 33 (3) e d 23 d~2 = S660-12 S440- 23 d~1 - S 5 50- 31 , are the compliance coefficients for the material. where Sij The thermal part of the strain-rate is given by d~1 - all, (4) where t denotes the rate of change of temperature, and aI' a 2 and a 3 are coefficients of thermal expansion in the respective coordinate directions.

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