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Three-Dimensional Crack Initiation and Propagation in Transparent Rock-Like Material Subject to Compression

受压缩的透明类岩石材料中的三维裂纹萌生和扩展

基本信息

批准号：
9622136
负责人：
Leonid Germanovich
金额：
$ 15.01万
依托单位：
University of Oklahoma Norman Campus
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1996
资助国家：
美国
起止时间：
1996-09-01 至 1999-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9622136&HistoricalAwards=false
关键词：
Three Dimensional Crack Initiation Propagation

项目摘要

9622136 This work, a collaboration between researchers at Cornell University and the University of Oklahoma, is focused on developing understanding about the mechanisms of rock fracture in compression. The research involves formulation and testing, with unique experiments and computer simulation, necessary to identify the evolution rules for the stable growth of three-dimensional cracks of arbitrary shape in brittle and rock materials. A laser will be used to induce three-dimensional cracks in transparent specimens. These specimens will be tested under compressive loading to induce stable growth and crack interactions. With transparent material, structural instabilities can be easily observed. Based on the test results, three-dimensional crack propagation criteria will be formulated. An existing computer simulator will be applied and extended for fully three-dimensional crack growth and interaction. Evolution rules for crack growth will be programmed into this simulator, which allows arbitrary trajectories of single internal cracks, cracks interacting with free surfaces, and with each other. The hypothesis to be tested within this objective is that, using computer simulation, an acceptable rule is one that will be able not only to reproduce experimental observations, but also will be able to predict evolving crack shapes in additional proof tests before performing them. ***

9622136 这项工作是康奈尔大学和俄克拉荷马大学研究人员之间的合作，重点是加深对岩石压缩破裂机制的理解。该研究涉及配方和测试，以及独特的实验和计算机模拟，以确定脆性和岩石材料中任意形状的三维裂纹稳定增长的演化规则所必需的。激光将用于在透明样品中诱发三维裂纹。这些样本将在压缩载荷下进行测试，以诱导稳定的生长和裂纹相互作用。使用透明材料，可以很容易地观察到结构的不稳定性。根据测试结果，将制定三维裂纹扩展准则。现有的计算机模拟器将被应用和扩展以实现全三维裂纹扩展和相互作用。裂纹扩展的演化规则将被编程到该模拟器中，该模拟器允许单个内部裂纹、裂纹与自由表面以及彼此相互作用的任意轨迹。在这个目标中要测试的假设是，使用计算机模拟，可接受的规则是不仅能够重现实验观察结果，而且能够在执行之前在额外的验证测试中预测不断变化的裂纹形状。 ***