| 空洞敏感材料轴对称超塑约束胀形的数值研究 |
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| 引用本文： | 胡平,李运兴.空洞敏感材料轴对称超塑约束胀形的数值研究[J].宇航学报,1995,16(3):53-59. |
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| 作者姓名： | 胡平 李运兴 |
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| 作者单位： | 吉林工业大学 |
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| 基金项目： | 国家自然科学基金,中科院力学研究所LNM开放实验室联合资助 |
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| 摘 要： | 本文将含有变形损伤的本构关系引入大应变刚粘弹有限元模型，研究空洞敏感材料轴对称超塑约束胀形变形特性与损伤机制，讨论了材料速率敏感指数ｍ，空洞长大速率Ｄ０，静水背压力Ｐｈ摩擦因子Ａｍ以及模具几何（宽高比ＲＤ／ＨＰ）对胀形件厚度不均匀性及空洞扩展的影响。
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| 关 键 词： | 变形损伤 超塑约束胀形 金属超塑成形 敏感材料 |
NUMERICAL STUDY OF AXISYMMETRICAL RESTAINED BULGING WITH SUPERIMPOSED PRESSURE FOR CAVITY SENSITIVE SUPERPLASTIC MATERIALS |
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| Hu Ping, Li Yunxing, Chen Suhuan.NUMERICAL STUDY OF AXISYMMETRICAL RESTAINED BULGING WITH SUPERIMPOSED PRESSURE FOR CAVITY SENSITIVE SUPERPLASTIC MATERIALS[J].Journal of Astronautics,1995,16(3):53-59. |
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| Authors: | Hu Ping Li Yunxing Chen Suhuan |
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| Abstract: | In this paper, a contitutive relation containing deformation damage is introduced into a rigid visco plastic finite element model for large strain problems. The superplastic deformation characteristics and the damage mechanism of axisymmetrical constrained bulging for cavity sensitive materials are numerically studied. The influences of the strain rate sensitive exponent m, the cavith growth rate D, the hydrostatic back pressure Ph, the friction factor Am and the die geometrical shapes (the ratio between the width RD and the height Hp) on the limit thicdness inhomogeneity and the cavity growth of bulged sheets are discussed in detail. Manners and methods improving the inhomogeneity and controlling the cavitation growth are proposed as well. |
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| Keywords: | Deformation damage Rigid visco plastic FEM Constrained superplastic bulging |
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