U.S.-Denmark Cooperative Research on Damage Evolutions and their Sensitivities during Metal Forming Process

美国-丹麦关于金属成形过程中损伤演变及其敏感性的合作研究

• 批准号: 9104865
• 负责人: Abhijit Chandra
• 金额: $ 1.44万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-03-15 至 1994-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9104865&HistoricalAwards=false
• 关键词: U.S.; Denmark; Cooperative; Research; Damage

This award supports Abhijit Chandra of the University of Arizona to collaborate in materials engineering research with Viggo Tvergaard of the Department of Solid Mechanics of the Technical University of Denmark. They share an interest in the forming of metal and in understanding the processes that affect the properties of the finished product. In particular, their collaborative research focuses on understanding the phenomenon of local instabilities generated by interactions of microdefects in a damage cluster. Professor Tvergaard has developed various models for damage evolutions in situations involving plasticity and creep. Professor Chandra has worked extensively on metal forming processes and on design sensitivities of these processes. This complementary expertise is combined very effectively in the proposed collaborative research plan. During a metal forming process, the workpiece material is subjected to intense stress and deformation fields. As a result, the material undergoes large plastic strains and rotations in order to produce new and desirable shapes of the workpiece. However, the stress and deformation fields may cause local instabilities that may nucleate microscopic voids. Growth of such defects results in degradation of the mechanical properties of the finished product, and may even lead to its failure. The results of the proposed research will be very helpful in designing forming processes that avoid or minimize the development of this damage in the workpiece.

该奖项支持亚利桑那大学的阿比吉特·钱德拉 与Viggo合作进行材料工程研究 技术学院固体力学系的特维尔加德 丹麦大学。 他们共同关心的是 金属和理解影响性能的过程 的成品。 尤其是他们的合作研究 着重于理解局部不稳定现象 由损伤簇中微缺陷的相互作用产生。 特弗加德教授已经建立了各种损伤模型 在涉及塑性和蠕变的情况下的演变。 教授 钱德拉在金属成型工艺和 这些过程的设计敏感性。 这种互补 在拟议的合作中， 研究计划。 在金属成形过程中，工件材料被 承受着强烈的应力和变形场 结果导致 材料承受大的塑性应变和旋转， 产生新的和所需形状的工件。 但 应力和变形场可能引起局部不稳定性， 使微观空隙成核 这种缺陷的生长导致 最终产品的机械性能降低， 甚至可能导致其失败。 建议的结果 研究将非常有助于设计成形工艺， 避免或尽量减少这种损害的发展， 工件