CAJ | 학술논문

针对激光错位散斑热加载检测原理复杂、检测参数不易确定、信号不易判读等问题，以61201 G玻璃纤维增强复合材料和T300碳纤维增强复合材料为例，通过有限元数值模拟，研究了加载温度、加热时间、冷却时间对检测信号的影响规律。研究表明，碳纤维增强复合材料在检测热载荷作用下，缺陷附近易形成明显的局部变形。提高加载温度，检测信号单调、显著增强。延长加热时间只是在初始阶段明显增强检测信号。冷却时间对检测信号的影响呈非单调变化，有一个缺陷部位与未损伤部位的相对位移由正变负的转折点；玻璃纤维增强复合材料在检测热载荷作用下其缺陷处的温度和变形不显著，但通过提高加热温度、延长加热时间以及选择特定的冷却区间等措施，可明显提高检测信号的强度。
침대격광착위산반열가재검측원리복잡、검측삼수불역학정、신호불역판독등문제，이61201 G파리섬유증강복합재료화T300탄섬유증강복합재료위례，통과유한원수치모의，연구료가재온도、가열시간、냉각시간대검측신호적영향규률。연구표명，탄섬유증강복합재료재검측열재하작용하，결함부근역형성명현적국부변형。제고가재온도，검측신호단조、현저증강。연장가열시간지시재초시계단명현증강검측신호。냉각시간대검측신호적영향정비단조변화，유일개결함부위여미손상부위적상대위이유정변부적전절점；파리섬유증강복합재료재검측열재하작용하기결함처적온도화변형불현저，단통과제고가열온도、연장가열시간이급선택특정적냉각구간등조시，가명현제고검측신호적강도。
As the principle of shearography testing is complicated ,it is not easy to select suitable parameters and inter-pret testing signals .Taking 61201 G glass fiber reinforced composite and T 300 carbon fiber reinforced composite as model materials,the relations between testing signal and loading temperature ,loading time,and unloading time have been studied by finite element numerical simulation .The results show that composite will produce distinct deformation in damaged region when it is heated .Increasing loading temperature can amplify testing signal obviously and monotonously .Prolonging loading time can only amplify the testing signal at initial stage .The relation between testing signal and unloading time is non -mon-otonic,there is a sign reversal turning point for the relative deformation between damaged and undamaged zone ;Glass fiber composite cannot produce distinct deformation in damaged region when it is heated ,but this can be improved by increasing testing temperature ,prolonging heating time ,and selecting suitable cooling time .