Numerical Simulation Study on Thermal Shearography Testing
As the principle of shearography testing is complicated,it is not easy to select testing parameters and interpret the testing signals exactly.Taking LY12 aluminum alloy and T300 carbon fiber reinforced composite as model materials,the relations between testing signal and loading temperature,heating time,and cooling time have been studied by finite element numerical simulation.The results show that composite such as T300 will produce distinct deformation in damaged region when it is heated,and increasing loading temperature can amplify testing signals obviously; prolonging the heating time can only amplify the testing signals at the initial stage; during cooling time,the relative deformation between damaged and undamaged area will change from positive to negative,which will make the two-bladed interference pattern from ‘‘left-white,right-black’’ to ‘‘left-black,right-white.’’ Metal such as LY12 cannot deform obviously in damaged region when it is heated,no matter how you adjust the testing parameters,so it is unsuitable to test metal structure by using thermal shearography.
Laser Shearography Thermal loading Metal Composite
Rili Hou Aiguo Wu Yan Li
The First Aeronautic Institute of Air Force, Xinyang 464000 Henan, China
国际会议
西安
英文
53-65
2013-11-25（万方平台首次上网日期，不代表论文的发表时间）