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Influence of the contact with friction on the deformation behavior of advanced high strength steels in the Nakajima test
The Journal of Strain Analysis for Engineering Design ( IF 1.6 ) Pub Date : 2021-05-27 , DOI: 10.1177/03093247211021257
Mohammad Mehdi Kasaei 1, 2 , Marta C Oliveira 1
Affiliation  

This work presents a new understanding on the deformation mechanics involved in the Nakajima test, which is commonly used to determine the forming limit curve of sheet metals, and is focused on the interaction between the friction conditions and the deformation behaviour of a dual phase steel. The methodology is based on the finite element analysis of the Nakajima test, considering different values of the classic Coulomb friction coefficient, including a pressure-dependent model. The validity of the finite element model is examined through a comparison with experimental data. The results show that friction affects the location and strain path of the necking point by changing the strain rate distribution in the specimen. The strain localization alters the contact status from slip to stick at a portion of the contact area from the pole to the necking zone. This leads to the sharp increase of the strain rate at the necking point, as the punch rises further. The influence of the pressure-dependent friction coefficient on the deformation behaviour is very small, due to the uniform distribution of the contact pressure in the Nakajima test. Moreover, the low contact pressure range attained cannot properly replicate real contact condition in sheet metal forming processes of advanced high strength steels.



中文翻译:

中岛试验中摩擦接触对高级高强钢变形行为的影响

这项工作对中岛试验中涉及的变形力学提出了新的理解,中岛试验通常用于确定金属板的成形极限曲线,重点是摩擦条件与双相钢变形行为之间的相互作用。该方法基于 Nakajima 试验的有限元分析,考虑了经典库仑摩擦系数的不同值,包括压力相关模型。通过与实验数据的比较来检验有限元模型的有效性。结果表明,摩擦通过改变试样中的应变率分布来影响颈缩点的位置和应变路径。应变局部化改变了接触状态,从滑动到粘附在从极点到颈缩区的接触区域的一部分。随着冲头进一步上升,这导致缩颈点的应变率急剧增加。由于中岛试验中接触压力的均匀分布,压力相关摩擦系数对变形行为的影响非常小。此外,所获得的低接触压力范围无法正确复制高级高强度钢的钣金成形工艺中的真实接触条件。由于中岛试验中接触压力的均匀分布。此外,所获得的低接触压力范围无法正确复制高级高强度钢的钣金成形工艺中的真实接触条件。由于中岛试验中接触压力的均匀分布。此外,所获得的低接触压力范围无法正确复制高级高强度钢的钣金成形工艺中的真实接触条件。

更新日期:2021-05-28
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