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中文摘要：
针对发动机再制造曲轴毛坯弯曲疲劳裂纹萌生扩展规律研究,提出了一种声发射与机器视觉传感融合的检测方法.该方法通过监测试验过程声发射/机器视觉信号变化来动态跟踪曲轴的疲劳失效信息,从而推测出裂纹的萌生扩展历程.测试结果表明:随着曲轴裂纹的萌生与扩展,声发射信号会发生阶段性改变.对这种变化规律进行理论分析,得出不同阶段声发射参数特征是由疲劳过程曲拐过渡圆角区域经历疲劳早期、裂纹萌生及裂纹扩展等阶段时发出不同应力波造成的;并结合机器视觉传感器初步推测出声发射能量与计数参数和裂纹扩展长度呈良好的线性关系.
英文摘要：
To understand the pattern of engine crankshaft bending fatigue crack initiation and propagation, a test method which combines the acoustic emission (AE) and machine vision sensing was proposed. By monitoring the changes of sound/light signal, crack initiation and propagation information in the experimental process was tracked and crack initiation and propagation processes were estimated. Results showed that, with crankshaft crack initiation and propagation, the AE signal was changed. Theoretical analysis found that, the AE characterized parameters at different stages was influenced by different stress waves caused by crank angle R during the fatigue process during early stage of fatigue damage, crack initiation and crack propagation stage. The combining machine vision sensors can predict the good linear relationship of AE energy and count with crack length. ? 2015, Chinese Society for Internal Combustion Engines. All right reserved.
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