# [1]徐贵娥,孙正华,方峰,等.拉丝过程中的缺陷模拟及其在拉拔工艺优化中的应用[J].东南大学学报(自然科学版),2005,35(3):409-414.[doi:10.3969/j.issn.1001-0505.2005.03.019] 　Xu Guie,Sun Zhenghua,Fang Feng,et al.Modeling of the central flaw in wire drawing and its application to processing optimization[J].Journal of Southeast University (Natural Science Edition),2005,35(3):409-414.[doi:10.3969/j.issn.1001-0505.2005.03.019] 点击复制 拉丝过程中的缺陷模拟及其在拉拔工艺优化中的应用() 分享到： var jiathis_config = { data_track_clickback: true };

35

2005年第3期

409-414

2005-05-20

## 文章信息/Info

Title:
Modeling of the central flaw in wire drawing and its application to processing optimization

1 东南大学土木工程学院, 南京 210096; 2 东南大学材料科学与工程系, 南京 210096
Author(s):
1 College of Civil Engineering, Southeast University, Nanjing 210096, China
2 Department of Material Science and Engineering, Southeast University, Nanjing 210096, China

Keywords:

TG256
DOI:
10.3969/j.issn.1001-0505.2005.03.019

Abstract:
Mechanism of central flaw generation is illuminated by modeling the stress distribution in heavy deformation zone of a wire without defect. An axisymmetrical numerical model is proposed on the basis of the assumption of the central axisymmetrical flaw, and the effects of parameters(die angle and friction coefficient etc.)on the stress field near the crack tip during the wire deformation are analyzed with the developed axisymmetrical finite element model. It can be concluded that the angle between the stress singularity zone near the crack tip and steel central-line decreases(i.e. a greater gradient of the nibbed pencil fracture and a longer neb)with increasing die angle and decreasing friction coefficient. The quantitative analysis of the effects of die angle, friction coefficient and flaw size on J-integral value is carried out by the calculation with ANSYS. It is shown that: J-integral value increases with increasing die angle, friction coefficient and the initial dimension of the flaw. When friction coefficient equals 0.1, J-integral value round the crack tip with the same flaw decreases with decreasing die angle. J-integral value changes slightly and tends to be a constant value when the angle reaches to 8°. The calculated results are then applied to improve the optimization of the technology for wire drawing.

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