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为阐明测试单元环境下加速任务试车(AMT)过程中叶片早期起裂的物理原因,对裂纹叶片断口进行了检查和分析,并采用LPTi s XactLIFETM系统对叶片进行了深入的分析.结果表明:叶片叶型发生了过量的蠕变损伤,此过量的蠕变损伤导致了叶片的过量延伸以及叶型特别是在尾缘区域的转扭,此行为可能造成AMT疲劳循环条件下缘板以下的叶片伸根部位疲劳裂纹的形核与生长.因此,过量的蠕变被认为是整个裂纹形核过程的主要驱动力.
In order to elucidate the physical causes of blade early initiation during Accelerated Task Test (AMT) in test cell environment, the fracture of cracked blade was examined and analyzed, and the LPTi s XactLIFETM system was used to analyze the blade.The results showed that the blade Excess creep damage has occurred in the leaf pattern, and this excessive creep damage results in excessive leaf extension and leaf twist especially in the trailing edge region, which may result in leaf elongation below the edge plate under AMT fatigue cycling Root fatigue crack growth and growth. Therefore, excessive creep is considered to be the main driving force for the entire crack nucleation process.