RIA: Analytical and Experimental Modeling of Acoustic Emission Signals

一项研究启动奖将资助一项利用声发射技术对结构材料进行先进无损检测的研究。将采用模型开发和实验验证相结合的方法。该模型将使用一个声信号源，该信号源是一个实际的裂纹扩展和止裂事件，包括裂纹位置和方向、裂纹尖端速度和扩展持续时间、部件几何形状和断裂模式。采用积分法计算各点处的动应力。从应力中计算出局部动态位移，并用于确定期望的声发射信号波形。

A Research Initiation Award will fund a study of advanced nondestructive testing of structural materials by acoustic emission. A combination of model development and experimental validation will be used. The model will use an acoustic signal source which is an actual crack propagation and arrest event and which includes crack location and orientation, crack tip velocity and duration of propagation, component geometry, and mode of fracture. The dynamic stresses will be calculated at each point by the integral method. From the stresses the local dynamic displacements will be calculated and used to determine the expected acoustic emission signal waveform.