辉长岩断裂面损伤度与断裂韧度的关系  

RELATIONSHIP BETWEEN FRACTURE TOUGHNESS OF GABBRO AND DAMAGE DEGREE NEAR ITS FRACTURE SURFACE

作　　者：张宗贤[1] 俞洁[1] 

机构地区：[1]北京科技大学

出　　处：《有色金属》1998年第1期5-8,共4页Nonferrous Metals

摘　　要：利用ＣａｍｂｒｉｄｇｅＱｕａｎｔｉｍｅｎｔｓＩｎｓｔｒｕｍｅｎｔｓ９００图像分析仪，对不同加载率ｋ（＝１００～１０６ＭＰａｍ１／２ｓ－１）条件下断裂的辉长岩短棒试件断裂面附近的损伤度（单位测量面积内裂纹所占面积百分比）进行了测量。结果表明，在静态或准静态加载条件下，辉长岩的损伤度近似于一个常数，但在动态（冲击）加载时（ｋ≥１０５ＭＰａｍ１／２ｓ－１），损伤度随ｋ的增加而增加。这一结果与辉长岩断裂韧度随ｋ的变化规律一致。根据所得结果，发现辉长岩断裂韧度与断裂面损伤度有着良好的线性关系。ith Cambridge Quantiments Instruments 900, damage degree(percentage by unit measured surface occupied by fractures) near the fractrure surface of a short rod gabbro specimen fractured under various loading rates ( k =100～106MPa1/2s-1) is measured The result shows that under the condition of static or quasistati cloading ( k <103MPa1/2s1) the damage egree of gabbro is nearly a constant, but under impact loading ( k ≥105 MPa1/2s-1) the damage degree increases with loading rate This is rather similar to the relationship between fracture toughness of gabbro and loading rate From this result, it is found that there is a good linear relationship between the fracture toughness and its damage degree

关 键 词：断裂韧度 损伤度 岩石力学 加载率 辉长岩 

分 类 号：TD315[矿业工程—矿井建设]