Participant Support for IUTAM Symposium Material Instabilities and the Effect of Microstructures

IUTAM 研讨会材料不稳定性和微观结构影响的参与者支持

• 批准号: 9909298
• 负责人: Stelios Kyriakides
• 金额: $ 0.5万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-06-01 至 2001-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9909298&HistoricalAwards=false
• 关键词: Participant; Support; IUTAM; Symposium; Material

Instability plays a crucial role in the design of solids and structures as it often limits their performance from their manufacturing stage to their installation and operation. The design of more effcient structures motivated the enormous progress in structural stability acheived during the period of 1940-70. More recently, the ares has received a new impetus form instabilities at the material level. This is partly due to the advent of new materilas but, also due to continuing efforts to develop constitutive laws and failure criteria for more conventional materials. Like in the more classical problems, such instabilities are governed by non linear interaction of geometry and material properties which now are related to the microstructure of the material. Examples of this class of relatively new problems are kinking failure in fiber composites in compression and in wood, stress induced transformations in shape memory alloys, shear licalizaion in metal mono- and polycrystals,and localization of deformation in compressed cellular materials. Similar problems are also known to govern the behavior of granular materials, rocks, concrete and several polymers.

不稳定性在固体和结构的设计中起着至关重要的作用，因为它往往限制了固体和结构从制造阶段到安装和运行的性能。更有效的结构设计推动了1940-70年期间在结构稳定性方面取得的巨大进步。最近，战神从物质层面的不稳定中获得了新的推动力。这在一定程度上是由于新材料的出现，但也是因为继续努力为更传统的材料制定本构定律和失效标准。就像在更经典的问题中一样，这种不稳定性是由几何和材料属性的非线性相互作用决定的，现在这些非线性相互作用与材料的微观结构有关。这类相对较新的问题的例子有：纤维复合材料在压缩和木材中的扭结破坏，形状记忆合金中的应力诱导相变，金属单晶和多晶中的剪切许可，以及压缩多孔材料中的变形局部化。众所周知，类似的问题也适用于颗粒材料、岩石、混凝土和几种聚合物的行为。