彩色数字全息测量杨氏模量

Investigation of Measuring the Young′s Modulus with Color Digital Holography

利用彩色数字全息系统获得哑铃形试件表面的三维形变场.通过试件线性区域的三维形变场计算得到的TC4钛合金材料的杨氏模量为90.79 GPa,同时,使用应变仪测量出该材料杨氏模量为99.05GPa.实验结果与传统应变仪检测结果接近,表明彩色数字全息测量材料杨氏模量的方法有效可行.该方法具有实时记录、全视场、非接触等特点,可以适应高温环境下材料服役过程中的实时检测.

Three dimensional deformation field of the dumbbell shaped specimen surface is obtained by color digital holographic system. The young＇s modulus of TC4 titanium alloy is calculated by the three dimensional deformation field in the linear zone of the specimen, which is 90.79 GPa. Moreover, the young＇s modulus of the material is measured as 99.05 GPa by the strain measuring instrument. The experimental results is approximate to the results of traditional strain measuring instrument. It indicates that the method of measuring Young＇s modulus by color digital holography is feasible and effective. The method has the characteristics of real-time recording, full-field, non-contact and so on. It can adapt to the real-time detection in the process of material service under high temperature environment.