摘要
由非线性的热弹理论，建立并求解了在一线热扰动下存在初始应力媒质中的热传导方程和运动方程。并由压电方程，得出耦合在试样背表面的压电换能器的输出电压与初始应力之间的关系式。利用光声和扫描电子声显微镜技术，对铝合金试样上维氏硬度压痕内的残余应力分布进行了实验测定。实验结果成功地揭示了压痕区内存在的交替的弹塑性应力分布，进一步证实了热弹技术是极有应用前景的无损定量评估材料内应力的新技术。
Based on the non-linear thermoelastic theory, the temperature field and displacement field in a prestressed sample are obtained when an one-dimension heat disturbance is applied to it. Using piezoelectric equations the relationship between the output signal of PZT transducer, which is coulped to the back surface of sample, and initial stress in sample is found. The experimental results, which are obtained by photoacoustic and SEAM techniques, about residual stress distributions in Vicker's indentations on Al disks are presented. It is clearly shown that a waved stress distribution existing in the indentation can be estimated by the thermoelastic technique.
出处
《声学学报》
EI
CSCD
北大核心
1996年第4期385-393,共9页
Acta Acustica
基金
国家自然科学基金
