...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Solids and Structures >Numerical failure analysis of a stretch-bending test on dual-phase steel sheets using a phenomenological fracture model
【24h】

Numerical failure analysis of a stretch-bending test on dual-phase steel sheets using a phenomenological fracture model

机译：基于现象学断裂模型的双相钢板拉伸弯曲试验数值失效分析

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Advanced High Strength Steels (AHSS) are increasingly used in automotive industry due to their superior strength and substantial weight advantage. However, their compromised ductility gives rise to numerous manufacturing issues. One of them is the so-called 'shear fracture' often observed on tight radii during stamping processes. Since traditional approaches, such as the Forming Limit Diagram (FLD), are unable to predict this type of fractures, great efforts have been made to develop failure criteria that could predict shear fractures. In this paper, a recently developed Modified Mohr-Coulomb (MMC) ductile fracture criterion (Bai and Wierzbicki, 2010) is adopted to analyze the failure behavior of a Dual Phase (DP) steel sheet during stretch-bending operations. The plasticity and ductile fracture of the present sheet are fully characterized by a Hill'48 orthotropic model and a MMC fracture model, respectively. Finite element models with three different element types (3D, shell and plane strain) were built for a Stretch Forming Simulator (SFS) test (Shih and Shi, 2008), numerical simulations with four different R/t values (die radius normalized by sheet thickness) were performed. It has been shown that the 3D and shell element simulations can predict failure location/mode, the upper die load-displacement responses as well as wall stress and wrap angle at the onset of fracture for all R/t values with good accuracy. Furthermore, a series of parametric studies were conducted on the 3D element model, and the effect of tension level (clamping distance), tooling friction, mesh size and fracture locus on failure modes and load-displacement responses were investigated.
机译：高级高强度钢（AHSS）由于其卓越的强度和明显的重量优势而越来越多地用于汽车行业。但是，它们延展性的降低引起许多制造问题。其中之一就是所谓的“剪切断裂”，通常在冲压过程中沿紧密的半径观察到。由于传统方法（例如成形极限图（FLD））无法预测这种类型的裂缝，因此已经做出了巨大的努力来开发可以预测剪切裂缝的破坏准则。在本文中，采用了最近开发的改进的Mohr-Coulomb（MMC）延性断裂准则（Bai和Wierzbicki，2010）来分析双相（DP）钢板在拉伸弯曲操作过程中的破坏行为。分别通过Hill'48正交各向异性模型和MMC断裂模型来充分表征本发明板材的可塑性和韧性断裂。建立了具有三种不同元素类型（3D，壳和平面应变）的有限元模型，用于拉伸成形模拟器（SFS）测试（Shih和Shi，2008），具有四个不同R / t值的数值模拟（模具半径通过图纸标准化）厚度）。已经显示，对于所有R / t值，3D和壳单元模拟可以预测所有R / t值的断裂位置/模式，上模载荷位移响应以及断裂开始时的壁应力和包角。此外，对3D元素模型进行了一系列参数研究，并研究了张力水平（夹紧距离），工具摩擦力，网格尺寸和断裂轨迹对破坏模式和载荷位移响应的影响。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号