Analysis and Prediction for Forming Limits of Electrodeposited Nickel Coating in the Right Region

China Mechanical Engineering ›› 2012, Vol. 23 ›› Issue (2): 229-232.

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Analysis and Prediction for Forming Limits of Electrodeposited Nickel Coating in the Right Region

Zhou Liqun1,2;Li Yuping2;Long Wenbao2

1.Hunan Institute of Engineering,Xiangtan,Hunan,411105 

2.Xiangtan University,Xiangtan,Hunan,411105

Online:2012-01-25 Published:2012-02-14
Supported by:
National Natural Science Foundation of China（No. 10702057）

电沉积镍涂层的冲压成形极限右边分析与预测

周里群1,2;李玉平2;龙文宝2

1.湖南工程学院,湘潭,411105

2.湘潭大学,湘潭,411105

基金资助:
国家自然科学基金资助项目(10702057);湖南省机械设备健康维护重点实验室资助项目
National Natural Science Foundation of China（No. 10702057）

Abstract

Abstract:

This paper analyzed the forming limits of coating sheet based on

actual materials’ stress-strain curves.The effective stresses and effective strains in the components were deduced during forming process,and forming limit strains

were obtained by solving nonlinear equation of the Swift diffuse necking conditions.Polynomials were used to fit the experimental stress-strain data in the coating and substrate.Research shows the forming limit curves based on polynomials fitting are lower than

that from the Hollomon formulae,and the coating thickness and substrate anisotropy have great effect on FLD.

The forming performance of the electrodeposited nickel coating is lower than that of the low carbon steel substrate. 

Key words: forming limit diagram(FLD), electrodeposited nickel coating, diffuse necking, plastic forming, stress-strain curve

摘要：

基于材料实际应力应变曲线,运用多项式拟合法计算了涂层薄板的成形极限。对冲压过程中涂层薄板的等效应力和等效应变进行了推导,通过求解Swift分散颈缩失稳条件的非线性方程得到了冲压成形极限的第一主应变,获得了涂层薄板的成形极限右边曲线。计算发现,涂层厚度、基体厚向异性指数对涂层薄板的成形极限有显著影响,镍涂层的成形性能低于钢基体的成形性能,并且基于实际应力应变曲线的涂层薄板的成形极限低于传统方法计算的成形极限。



关键词:

成形极限图(FLD), 电沉积镍涂层, 分散颈缩, 塑性成形, 应力应变曲线

CLC Number:

ZHOU Li-Qun-1, 2, LI Yu-Beng-2, LONG Wen-Bao-2.

Analysis and Prediction for Forming Limits of Electrodeposited Nickel Coating in the Right Region

[J]. China Mechanical Engineering, 2012, 23(2): 229-232.

周里群1, 2, 李玉平2, 龙文宝2.

电沉积镍涂层的冲压成形极限右边分析与预测

[J]. 中国机械工程, 2012, 23(2): 229-232.

References

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Analysis and Prediction for Forming Limits of Electrodeposited Nickel Coating in the Right Region

电沉积镍涂层的冲压成形极限右边分析与预测

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