| 唐山,郭田福,彭向和.压力敏感材料中的空洞长大研究及其在页岩及高分子材料中的应用(英文)[J].计算力学学报,2016,33(4):649~656 |
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| 压力敏感材料中的空洞长大研究及其在页岩及高分子材料中的应用(英文) |
| Void growth in a pressure-sensitive dilatant solid——applications to shale rocks and polymers |
| 投稿时间：2016-05-19 修订日期：2016-06-13 |
| DOI：10.7511/jslx201604035 |
| 中文关键词: 压力敏感 页岩 高分子 空洞长大 内压 |
| 英文关键词:pressure sensitivity shale rocks polymer void growth internal pressure |
| 基金项目:国家千人计划项目；重庆自然科学基金（0211002431039，cstc2013jcyjA50010）；国家自然科学基金（11472065，11332013）资助项目. |
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| 中文摘要: |
| 主要研究压力敏感材料中含内压的空洞长大，如页岩或者高分子材料。采用数值方法研究含内压空洞的对称和非对称球形和柱形胞元的宏观力学行为。结果表明，压力敏感性及其空洞内压将极大影响空洞的形核与长大。在球形胞元情形中未出现柱形胞元的单轴拉伸现象。将胞元有限变形的数值计算结果与基于近期提出的考虑压力敏感材料中空洞长大的塑形力学模型的分析结果进行了对比。 |
| 英文摘要: |
| This paper deals with the study of an internally pressurized void whose matrix,such as rock and poly-meric materials,exhibits pressure-sensitive yielding and plastic dilatancy.The macroscopic behaviors of porous solids are studied by numerical axisymmetric spherical and cylindrical unit cell analyses at finite strains subjected to Cauchy-type internal void pressure.Results show that pressure-sensitivity and internal pressure have a strong influence on void growth and coalescence.For the spherical unit cell,a shift from a general axisymmetric deformation state to uniaxial straining does not occur though it is generally observed to be the onset of void coalescence in cylindrical unit cell.Furthermore,an upper bound model developed for a porous solid with a pressure-sensitive dilatant matrix is verified by the presented numerical cell analyses at finite strain. |
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