Surface Waviness and Wrinkling in Sheet Metal Forming

这项研究的目的是获得一个 深入了解相对未开发的表面波纹区域 (or在金属板成形过程中可能发生的变形， 对材料的影响有一个基本的了解 这些工艺参数上的参数， 波度，并提供技术准则，以避免这种 形成高强度材料的缺陷。 这项研究将 包括：（1）矩形和方形冲头的实验研究 周边夹紧的金属板拉伸，（2）分析 矩形和方形凸模拉伸，（3）各种研究 本构方程和建立那些最适合 预测金属板中的表面波纹度/起皱，（4） 双轴向强度的试验测定 （5）制定工艺设计指南， 形成没有表面波纹的面板并测试这些面板 实际冲压过程的指导方针。 表面波纹度为 板料成形中的主要失效形式之一 这是一个制造过程中采用的许多 行业 拟议的研究应该会导致一个更好的 理解这个失败的问题，并导致 金属板成形工艺的改进。 本研究 将由两所大学合作进行 一个国家实验室和一个工业公司。

The objective of this research proposal is to gain an insight into the relatively unexplored area of surface waviness (or wrinkling) which can occur during sheet metal forming, to obtain a fundamental understanding of the influence of material parameters on those process parameters that cause surface waviness, and to provide technical guidelines for avoiding such defects in forming high-strength materials. The research will include: (1) Experimental studies on rectangular and square punch stretching of peripherally clamped sheet metals, (2) Analysis of rectangular and square punch stretching, (3) Study of various constitutive equations and establishment of those best suited for predicting surface waviness/wrinkling in sheet metal, (4) Experimental determination of biaxial strength of selected materials, and (5) Establishment of process design guidelines for forming panels without surface waviness and testing those guidelines on an actual stamping process. Surface waviness is one of the main types of failures in the sheet metal forming process which is a manufacturing process employed in many industries. The proposed research should lead to a better understanding of this failure problem and result in an improvement in the sheet metal forming process. This research will be conducted jointly by two universities with collaboration from a national laboratory and an industrial company.