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王学滨,潘一山.动力应变局部化传播及尺寸效应数值模拟[J].计算力学学报,2002,19(4):500~503
动力应变局部化传播及尺寸效应数值模拟
Numerical simulation of development of dynamic strain localization and size effect
  修订日期:2000-10-18
DOI:10.7511/jslx20024104
中文关键词:  局部化,剪切带倾角,尺寸效应,应变软化,拉格朗日元法,试样宽度
英文关键词:localization,inclination angle of shear band,size effect,strain\|softening,Fast Lagrangian Analysis of Continua,width of specimen
基金项目:2 0 0 0年国家教委青年教师项目 (0 65 ),辽宁工程技术大学基金项目 (0 2 -3 8)
王学滨  潘一山
辽宁工程技术大学力学与工程科学系,辽宁工程技术大学力学与工程科学系,长江科学院岩基所,长江科学院岩基所 阜新123000,阜新123000中国地震局地质研究所,北京100029,武汉430007,武汉430007
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中文摘要:
      采用 FLAC-3 D模拟了应变软化岩土材料局部化剪切带的发展、扩容对剪切带倾角的影响及试件的宽度效应。随着加载时步的增加 ,彼此孤立的两个应变场逐渐靠近、叠加 ,最终形成了剪切带网络。无论端面约束强或弱 ,剪切带的倾角的数值模拟结果都与罗斯科倾角比较接近。增加试样宽度 ,剪切带的宽度增加 ,剪切带变得不平直 ;宽度越大 ,岩样上端面中点的压应力 -加载时步曲线的峰值强度越大 ,宽度对弹性阶段没有大的影响
英文摘要:
      FLAC\|3D is used to model progressive development of shear bands, the influence of dilation angle on the inclination angle of shear band and the effect of width of the specimen on patterns of localized bands in strain\|softening materials etc. Using FISH embedded in standard code, a function is written so that the evolution of localization is clearly apparent from 3 dimensional curved figures. With the increment of time steps, two isolated strain fields propagate towards each other. By certain time steps, the two fields meet and interact, and in the last the networks of shear bands are developed. Whether the strong end constraint or not, the inclination angle is close to Roscoe solution. Both the width of shear band and the peak strength of compressive stress in the center of upper end of specimen increase with the width of specimen. Larger width of specimen leads to curved shear band and the compressive stress\|time steps (or axial strain) curves in elastic stage is not dependent on the width of specimen.
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