试样几何形状和尺寸对C/C复合材料拉伸强度的影响  

Influence of geometry and size of specimen on tensile strength of C/C composites

作　　者：宋昌哲[1] 张程煜[1] 乔生儒[1] 严科飞[1] 韩栋[1] 李玫[1] 

机构地区：[1]西北工业大学超高温结构复合材料国防科技重点实验室,西安710072

出　　处：《固体火箭技术》2010年第3期349-352,共4页Journal of Solid Rocket Technology

基　　金：国家自然科学基金(50702045);高等学校博士点学科基金(20070699007);新世纪优秀人才支持计划

摘　　要：为了确定C/C复合材料的高温拉伸试样的尺寸和形状,对7种C/C复合材料拉伸试样的室温拉伸强度进行研究。结果表明,为悬挂引伸计传感器而加工的凸台的形状对材料的拉伸强度有明显影响。方形、三角形凸台试样的几何应力集中因子分别为2.41和1.01。拉伸强度与凸台形状密切相关,拉伸强度随着标距宽度和长度的增加呈下降趋势,符合尺寸效应规律,标距长度在30~40 mm变化时,拉伸强度基本不变。In order to define the geometry and size of the tensile specimen for C/C composites at high temperatures,the tensile strength of 7 kinds of specimens was investigated at room temperature.The results show that the shape of boss machined for hanging the extensometer at high temperatures has significant influence on the tensile strength.The geometric stress concentration factor of the quadrate boss is 2.41,while that of the triangular boss is 1.01.The tensile strength is closely correlated to the specimen sizes.It decreases with the increase of the specimen gauge width and length.But the variation of tensile strength is small when the gauge length is in the range 30 mm to 40 mm.

关 键 词：C/C复合材料 拉伸强度 尺寸效应 

分 类 号：TB332[一般工业技术—材料科学与工程]