裂纹缺陷体积百分数与CT数的关系分析

Relation Analysis between Volume Percent of Crack Defect and CT Number

本文利用混合体的线性衰减系数的线性表示,推导出材料受力环境下,不含杂质时,微裂纹群的出现所带来的密度相对变化量与CT数相对变化量之间的关系式。进一步分析得到了裂纹缺陷体积百分数相对变化量与CT数相对变化量之间的关系式。含单杂质时,得到了裂纹缺陷体积百分数相对变化量与CT数相对变化量的关系式,并且把结论进一步推广到多杂质情形。为后期利用CT进行材料疲劳寿命分析奠定了理论基础。

In this paper, from the linear representation of linear attenuation coefficient of mixture, density variations and CT number variations are induced by microcracks under stress, the formula between relative density variations and relative CT number variations is obtained without impurity. With further analyzing, a formula between relative volume percent of crack defect variations and relative CT number variations is obtained respectively, without impurity and with impurity, and we extend conclusion of impurity to impurities. All these lay a theoretical foundation for material fatigue life prediction by using CT.