为了验证碳纤维树脂基复合材料超声检测的有效性和准确性,对铺层树脂传递模塑成型(RTM)复合材料超声检测中典型的缺陷信号进行了解剖,并采用微焦点CT检测和金相表征分析,发现超声检测对于分层和裂纹类缺陷敏感,但无法进一步对二者进行分辨;对于密集孔隙和微裂纹也可以很好检出,却也无法进一步分辨;对于微裂纹,微焦点CT无法检出,而超声检测可检出.

针对某大客发动机涡轮后机匣镍基合金整体精铸、变壁厚、多转角等结构特点,特制了在其射线检测时的专用检测工装,保证了射线检测工艺参数的一致性;通过试验优选了各项射线检测工艺参数;保证了机匣所有高应力区域及转接区域的100％检测;达到了机匣的质量检测要求,保证了机匣使用的可靠性.

Due to the combustion chamber usually provide flam with a non-uniform temperature field, therefore, a lateral temperature gradient should exist on the surface of nozzle guide-vanes for a gas turbine. In the present article, the structure evolution of thermal barrier coatings on nozzle guide-vanes was examined under the action of the above mentioned lateral temperature gradient by means of a home madeinfrared thermal shock testing system combined with impedance spectrosco- py measurement. Meanwhile, the failure analysis of thermal barrier coatings being subjected to thermo-mechanical loading was also studied using finite element analysis. It's found that with con- strain at both ends of a tube, cracks are apt to initiate at the edge of a heated area.