摘要
为了研究岩石拉破坏过程中的变形局部化特征,采用数字图像相关方法进行了巴西圆盘劈裂试验及变形场测试,分析了圆盘试件破坏过程中的水平位移场演化过程。研究表明:巴西圆盘在压密阶段即已出现较明显的水平位移局部化现象,弹性阶段的局部化区域由上下端向中部扩展,在塑性阶段演化为近似中心对称的扇形;巴西圆盘左右背向位移差过大时,试件中部会呈现一条零位移条带,并在峰值点时张拉破坏为裂隙带。
In order to study the characteristics of rock deformation localization in the process of tensile failure,the split test and deformation field test were conducted to analyze the horizontal displacement field evolution of the Brazilian disc in the process of destruction by using the digital speckle correlation method.Studies show that in the compaction stage,obvious horizontal displacement localization occurs to the Brazilian disc;in the elastic stage,the localization extends from the upper and lower ends to the central section;and in the plastic stage,the localization evolves into an approximately centrosymmetrical fan shape.When the displacement difference between the left and right sections is too large,a zero displacement strip appears in the center of the specimen,which becomes a fractured zone at the peak point.
出处
《山东科技大学学报（自然科学版）》
CAS
2017年第6期47-51,共5页
Journal of Shandong University of Science and Technology(Natural Science)
基金
国家自然科学基金项目(51474013)
山东省优秀中青年科学家科研奖励基金项目(BS2014F012)
山东科技大学人才引进科研启动基金项目(2014RCJJ026)
关键词
变形局部化
数字图像相关方法
拉破坏
巴西圆盘
deformation localization
digital speckle correlation method
tensile failure
Brazilian disc
