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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2024.5
- 수록면
- 1,256 - 1,269 (14page)
- DOI
- 10.1007/s12540-023-01572-x
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초록· 키워드
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In this study, the heterogeneous strengthening behavior in shear deformation was experimentally characterized and numericallymodeled for the first time. Uniaxial tensile and simple shear tests were conducted to evaluate the mechanical behaviorof Al/Steel/Al layered sheet and its monolithic layers. Contrary to expectations, the mechanical behavior of the layered sheetshowed more outstanding performance compared to a simple calculation of the rule of mixtures in not only tensile deformationbut also shear deformation, proving the heterogeneous strengthening effect in shear deformation as well. Moreover,the yield strength showed similar synergies in tensile and shear deformations, but the shear deformation exhibited a higheradditional strengthening effect at the load before reaching fracture. This remarkable outcome is primarily attributed to theformation of a large amount of geometrically necessary dislocations near the heterogeneous interface in shear deformationthan at tensile maximum load. Meanwhile, microstructure and deformation mechanism-based constitutive models wereapplied to finite element simulations of tensile and shear deformations. The numerically predicted stress–strain curves werecompared to experimental results, indicating that microstructure-based constitutive models are reasonable for shear stressstate as well as uniaxial tension state. Furthermore, dislocation density-based hardening model is better than conventionalphenomenological isotropic hardening for extrapolation of large strain in simple shear test. This is mainly due to considerationof microstructural features in dislocation density-based hardening model.
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