试样厚度与CTOD临界值的拟合关系式  

Fitted Equation of Specimen Thickness versus Critical Value of CTOD

作　　者：闫鹏帅[1] 苗张木[1] 夏子钰[1] 叶运勤[1] 

机构地区：[1]武汉理工大学交通学院结构工程系,武汉430063

出　　处：《机械工程材料》2013年第8期95-97,共3页Materials For Mechanical Engineering

摘　　要：为研究试样厚度对其裂纹尖端张开位移(CTOD)临界值的影响,通过巴林布特拉吸附力理论建立了CTOD临界值(δ)与试样厚度(t)的表达式,通过最小二乘法拟合得到了δ与t的关系式,并应用16MnNbp钢在CTOD试验中得到的数据进行了验证。结果表明:16MnNbp钢CTOD临界值(δ)的拟合公式为δ=0.05te-0.03t0.125+0.16(1-e-0.03t0.125),其与试验所得数据吻合较好。A mathematical expression of the relation between crack tip opening displacement （CTOD） critical value （δ） and material thickness （t） was obtained by Barenblatt＇s theory to study the effect of material thickness on CTOD critical value. A theoretical equation of 8 and t was fitted by the least square method, and was verified by comparing with test results of 16MnNbp steel in a CTOD experiment. Results show that the fitted equation could be described as δ=0.05te-0.03t0.125＋0.16（1-e-0.03t0.125） . The calculated results could fitted well with test results.

关 键 词：厚度效应 裂纹尖端张开位移(CTOD) 巴林布特拉吸附力理论 

分 类 号：TB302.3[一般工业技术—材料科学与工程]