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，因为它常常限制它们从制造阶段到安装和操作的性能。 更高效结构的设计推动了 1940-70 年间结构稳定性的巨大进步。 最近，战神因物质层面的不稳定而获得了新的动力。 这部分归因于新材料的出现，但也归因于为更传统材料制定本构定律和失效标准的持续努力。 与更经典的问题一样，这种不稳定性是由几何形状和材料特性的非线性相互作用控制的，而这些特性现在与材料的微观结构有关。 这类相对较新的问题的例子有压缩纤维复合材料和木材中的扭结失效、形状记忆合金中的应力引起的转变、金属单晶和多晶中的剪切热化以及压缩多孔材料中的局部变形。 已知类似的问题也影响着颗粒材料、岩石、混凝土和几种聚合物的行为。