Development of non-destructive fatigue damage evaluation method before crack initiation by using magnetism measurement.

为了利用磁性测量来开发非破坏性密度损伤评估，在磁性损伤过程中的密度体积部分是通过铁蛋白镜来测量的，而在磁性相位中引入的泄漏磁通量密度是通过MI传感器来测量的，那么哪一个是高灵敏度的磁性传感器。它被发现是一个巨大的体积分数改变了塑料丝范围的对应关系。这一结果表明，肥胖损伤可能是根据人工智能体积分数的测量而估计的。对于敏感性阶段的变化的检测， SQUID显微镜已经开发出来。同步加速器辐射和CT成像已经被开发出来，以观察裂缝启动和小裂缝的传播行为。

For development of nondestructive fatigue damage evaluation using magnetic measurement, martensitic volume fraction in fatigue damage process was measured by the ferrite scope, and leakage magnetic flux density caused by martensitic phase was measured by the MI sensor, which was high sensitive magnetic sensor. It was found that the martensitic volume fraction changed corresponding to the plastic strain range. This result shows that the fatigue damage can be estimated from the measurement of martensitic volume fraction. For sensitive detection of the change in martensitic phase, SQUID microscope was developed. Synchrotron radiation ・CT imaging was developed to observe the crack initiation and the propagation behavior of small crack.