U.S.-Federal Republic of Germany Cooperative Research on Phenomenological and Stochastic Viscoplasticity

美德意志联邦共和国现象学和随机粘塑性合作研究

• 批准号: 8722580
• 负责人: Erhard Krempl
• 金额: $ 0.63万
• 依托单位: Rensselaer Polytechnic Institute
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-08-01 至 1990-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8722580&HistoricalAwards=false
• 关键词: U.S.; Federal; Republic; Germany; Cooperative

This award supports Dr. Erhard Krempl of Rensselaer Polytechnic Institute for collaborative research in mechanical engineering with Dr. Elmar Steck of the Institute of Mechanics at the Technical University of Braunschweig, Federal Republic of Germany. Research groups at both institutions are studying viscoplasticity by developing and testing models of the inelastic behavior of materials under stress. While their theories have some common characteristics, they are based on completely different philosophies or approaches. The U.S. group has developed a phenomenological, experimentally verified viscoplasticity theory based on overstress; the West German group is working on a stochastic, microstructurally based theory. Their collaboration is aimed at giving the phenomenological viscoplasticity theory a microstructural base and at extending the stochastic theory to arbitrary loading in one dimension and to a three-dimensional formulation. The excellent experimental facilities at RPI will be used to test the emerging models. Modern materials and production techniques together with economic demands have led to weight reduction and increasingly severe operating conditions for a great variety of mechanical equipment. Simple analytical methods for predicting performance of materials under stress are no longer adequate. Most limiting states of structural materials are associated with nonlinear, inelastic behavior; modeling such behavior has only become possible in the past decade or so with the availability of sophisticated computational techniques. Further understanding of material behavior under stress and improvement of material models can be expected from this analysis and synthesis of different approaches to the study of plasticity.

该奖项支持Rensselaer理工学院机械工程合作研究所的Erhard Krempl博士与德国联邦联邦共和国Braunschweig技术大学的Elmar Steck博士。 这两个机构的研究小组都通过在压力下开发和测试材料非弹性行为的模型来研究粘塑性。 尽管他们的理论具有一些共同的特征，但它们基于完全不同的哲学或方法。 美国集团开发了一种基于过度应力的现象学，实验验证的粘塑性理论。西德集团正在研究基于微观结构的随机理论。 他们的合作旨在使现象学粘塑性理论是一个微观结构基础，并将随机理论扩展到任意载荷，并在一个维度上和三维公式。 RPI的出色实验设施将用于测试新兴模型。 现代材料和生产技术以及经济需求导致了各种机械设备的重量减轻和越来越严重的操作条件。 预测压力下材料性能的简单分析方法不再足够。 结构材料的大多数限制状态与非线性，非弹性行为有关。在过去的十年左右的时间里，通过复杂的计算技术的可用性，对这种行为进行建模。 通过这种分析以及对可塑性研究的不同方法的综合，可以预期对压力下的物质行为的进一步理解。