| 厚向异性值r及应变硬化指数n对板料拉深成形性能的影响 |
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| 引用本文： | 周晓.厚向异性值r及应变硬化指数n对板料拉深成形性能的影响[J].重庆大学学报(自然科学版),1991(2). |
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| 作者姓名： | 周晓 |
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| 作者单位： | 重庆大学冶金及材料工程系 |
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| 摘 要： | 基于R·Hill的各向异性材料理论及W·Panknin的关于拉深应力的计算方程,通过理论分析研究了n,r值对拉深成形时杯形件简壁的屈服和破裂的影响。实验表明,n值对极限拉深率几乎无影响,在n,r值对材料破裂的影响方面,实验结果同理论分析吻合得相当好。本又对拉深成形的理论分析解释了r,n值之间的相互关系,因此,更好地理解和预测板料的拉深性能是可能的。
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| 关 键 词： | 厚向异性 应变硬化 极限拉深率 |
AN ANALYSIS OF THE INFLUENCE OF NORMAL ANISOTROPY r AND STRAIN HARDENING EXPONENT n ON THE DRAWABILITY OF SHEET METALS |
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| Zhou Xiao.AN ANALYSIS OF THE INFLUENCE OF NORMAL ANISOTROPY r AND STRAIN HARDENING EXPONENT n ON THE DRAWABILITY OF SHEET METALS[J].Journal of Chongqing University(Natural Science Edition),1991(2). |
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| Authors: | Zhou Xiao |
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| Abstract: | The influence of n and r values on the yielding and failure of the cup wall in deep drawing is investigated through a theoretical analysis. The analysis is based on R. Hills theory on anisotropic materials and on W. Panknin' s equations concerning the calculation of the drawing stresses. Experimental work confirms that n has only little influence on the limiting drawing ratio (LDR). The expermental results are very much in accordance with the theoretical analysis as far as the influence of n and r on the failure of the material is concerned. The analytical treatment of deep drawing achieved in this theoretical study explains the interaction between r and n values. It is thereby, possible to better understand and predict the deep drawing behavior of sheet metals. |
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| Keywords: | normal anisotropy strain hardening limiting drawing ratio |
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