权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Localizing signatures of catastrophic failure (LOCAT)

本地化灾难性故障的特征 (LOCAT)

基本信息

批准号：
EP/I018492/1
负责人：
Ian Main
金额：
$ 25.05万
依托单位：
University of Edinburgh
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2011
资助国家：
英国
起止时间：
2011 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FI018492%2F1
关键词：
Localizing signatures catastrophic failure LOCAT

项目摘要

Complex materials, like ceramics, rocks and the Earth's crust, often break in a catastrophic manner, after a long period of sustained or fluctuating stress. Similar catastrophic failure events also happen in biological and social systems, as mass extinctions, tipping points, and stock market crashes, and a range of tools have been developed to address these under the general framework of 'complexity science'. Here we will use these tools to look for patterns of behaviour, and their underlying causes, in the transition from the relatively stable phase of stressing a composite natural or synthetic material to its ultimate failure. We will focus on disordered porous media such as natural rocks and combine characterization using high-resolution C-T scanning with numerical modelling of the deformation and failure process, and analysis of laboratory and natural data on deformation up to the geophysical scale, in order to address the following questions.I. What role does localisation of deformation play in global acceleration to failure?II. What is the predictability of the acceleration phase in statistical terms?III. Are there any universal signatures of the spatio-temporal evolution of damage which permit lifetime estimates for single samples?IV. What are the scaling relations that link simulations and laboratory tests to the geophysical scale.

复杂的材料，如陶瓷、岩石和地壳，在长期持续或波动的应力后常常会以灾难性的方式破裂。类似的灾难性失败事件也发生在生物和社会系统中，如大规模灭绝、临界点和股市崩盘，并且在“复杂性科学”的总体框架下开发了一系列工具来解决这些问题。在这里，我们将使用这些工具来寻找从对复合天然或合成材料施加压力的相对稳定阶段到其最终失效的过渡过程中的行为模式及其根本原因。我们将重点关注天然岩石等无序多孔介质，将高分辨率 C-T 扫描表征与变形和破坏过程的数值模拟相结合，并分析实验室和自然变形数据直至地球物理尺度，以解决以下问题。局部变形在整体加速失效中起什么作用？从统计角度来看，加速阶段的可预测性是什么？损伤时空演化是否存在任何通用特征，可以对单个样本进行寿命估计？将模拟和实验室测试与地球物理尺度联系起来的尺度关系是什么？