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针对某空心风扇叶片试验件在高循环疲劳试验中出现的异常失效现象,完成了振动仿真分析和断口分析。仿真分析结果表明失效区域非应力集中部位,断口分析结果表明裂纹萌生于薄板与叶盆侧厚板交接部位,其失效模式为疲劳失效,失效机理为超塑成形环节局部区域薄板扭曲导致高循环疲劳试验中薄板与厚板发生摩擦,进而疲劳失效。基于以上分析,制定了优化超塑成形工艺参数并增加CT检测环节的改进措施。验证试验表明,改进措施有效,很好地解决了该异常失效问题。
Aiming at the abnormal failure phenomenon of a hollow fan blade test piece in high cycle fatigue test, the vibration simulation analysis and the fracture analysis were completed. The results of the simulation analysis show that the non-stress concentration area in the failure area and the fracture analysis results show that the crack initiation occurs at the interface between the thin slab and the plate-side slab, and the failure mode is fatigue failure. The failure mechanism is that the thin slab in the local area of the super- In the experiment, the friction between the thin plate and the thick plate occurred, and then the fatigue failed. Based on the above analysis, an improvement measure to optimize the process parameters of superplastic forming and increase the CT testing links was developed. The verification test shows that the improvement measures are effective and the abnormal failure problem is well solved.