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자료유형
학술대회자료
저자정보
Jason Har (대한항공)
저널정보
대한기계학회 대한기계학회 춘추학술대회 대한기계학회 2004년도 고체 및 구조역학 부문 학술대회 논문집
발행연도
2004.10
수록면
57 - 61 (5page)

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This paper discusses applications of the objective stress rates of the Kirchhoff or Cauchy stress to a unified stress update algorithm for transient shell dynamic analysis within the context of explicit time integration. The Eulerian ratetype constitutive equations of hypoelastic-plastic materials are established for the stress update algorithm. The equations are based on the additive decomposition of the rate of deformation tensor under the assumption that the elastic part of the rate of deformation tensor is characterized to be hypoelastic with grade zero, i.e., the fourth-rank constant isotropic tensor. Several objective stress rates are derived through the Lie derivative of the Kirchhoff or Cauchy stress tensor. Those stress rates cover, for instance, the Jaumann, Green-Naghdi, Truesdell, Oldroyd, and Cotter-Rivlin stress rates, based on the Cauchy or Kirchhoff stress. Furthermore, the unified stress update algorithm is embodied and fulfilled in association with the so-called radial return method and the phenomenological plasticity theory with combined isotropic/kinematic hardenings. Among the objective stress rates applied, the stress update procedure based on the Green-Naghdi stress rate for transient shell dynamics is especially crucial in this paper, because this algorithm developed in this work is not available even in the representative commercial codes, such as LS-DYNA and ABAQUS/EXPLICIT. In the implementation of the unified stress update algorithm, the Belytschko-Lin-Tsay shell theory is exploited to validate its accuracy and effectiveness. The ultimate objectivity of this work is to provide a guideline for the best choice of an appropriate objective stress rate for finite phenomenological elastoplasticity models. Several numerical examples are demonstrated including non-contact transient shell dynamics examples and contact-impact examples by which the accuracy and effectiveness of the unified stress update algorithm, developed in this work, are addressed.

목차

Abstract
1. Introduction
2. A Unified Stress Update Algorithm for Hypoelastic-Plastic Materials
3. Numerical Examples
4. Conclusion
Acknowledgements
References

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UCI(KEPA) : I410-ECN-0101-2010-550-003148927