摘要
描述了用实验观测和分析的方法考察砂浆试样在受压过程中裂纹扩展和变形响应之间的固有关系。在压缩过程中,砂浆试样表面裂纹的图像和变形响应曲线被实时记录下来。由于试样表面粗糙不平,原始的数字图像常含有大量的伪裂纹,为此开发了处理软件,去除了伪裂纹,从而提取出准确的裂纹信息。为了获得试样的表面裂损度,采用两种方法对表面裂纹进行量化,在实验观测和分析的基础上,通过理论分析得到裂纹演化和非线性变形之间的固有关系。根据这种关系,可以通过测量试样的表面裂纹,得到单轴压缩状态下由损伤引起的材料变形性质的演化。
The experimental investigation and analysis are presented for exploring the intrinsic link betweencompressive deformational response and crack behavior of the mortar specimens. Images of the crack propagation on the surface of specimens are recorded synchronously during compressive deformation, and then processed to obtain the cracking process. The identified cracks are then analyzed quantitatively to obtain the measurement ofthe cracking degree by using the methods in which the effect of the direction of cracking is considered. Theoretical analyses are made for obtaining the intrinsic relation between cracking and non-linear deformational response in conjunction with the experimental observations. The obtained relation provides an effective way to measure theevolution of deformation property of the material caused by damage under compression throughout themeasurement of cracking on the surface of the specimen.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2003年第3期425-428,共4页
Chinese Journal of Rock Mechanics and Engineering
基金
江苏省自然科学基金资助项目(BK97005)
关键词
砂桨
受压变形
裂纹
压缩变形
裂纹演化
损伤变量
脆性固体
fracture mechanics,compressive deformation,cracking process,damage variable,brittle solid
