CAJ | 학술논문

通过对45＃钢U 型缺陷平板试件反复加载-卸载的疲劳试验数据进行分析，测量了试件表面法向的漏磁场分布，分析了U 型缺陷对磁记忆信号的影响，以及固定位置的磁场值随循环次数的变化关系。发现试件在15万次循环周次时（最终循环周次的30％左右）磁记忆信号出现反转现象。将磁信号特征参量K max 的变化规律与损伤力学模型中材料损伤参量D 进行对比后发现，材料损伤参量D 可以通过磁信号特征参量K max 进行表述，为金属磁记忆检测技术用于评估材料的疲劳损伤程度做了一定的铺垫。
통과대45＃강U 형결함평판시건반복가재-사재적피로시험수거진행분석，측량료시건표면법향적루자장분포，분석료U 형결함대자기억신호적영향，이급고정위치적자장치수순배차수적변화관계。발현시건재15만차순배주차시（최종순배주차적30％좌우）자기억신호출현반전현상。장자신호특정삼량K max 적변화규률여손상역학모형중재료손상삼량D 진행대비후발현，재료손상삼량D 가이통과자신호특정삼량K max 진행표술，위금속자기억검측기술용우평고재료적피로손상정도주료일정적포점。
Tablet samples of 45 # steel with U-type defects were tested under repeated loading and unloading for fatigue test and were analyzed by measuring the leakage magnetic field of the sample surface normal distribution. The effect of U-shaped defects on the magnetic memory signals was analyzed and the relationship between magnetic field values and the cycle at the fixed position was also analyzed.It was found that an inversion phenomenon of the magnetic signal appeared at 150,000 cycles times (about 30% final week cycle times)for the specimen.Comparison was made for the variation of the magnetic signal characteristic parameters K max and the material damage parameter D in damage mechanics model and it was found that the parameter D could be expressed by the K max ,which might provide a means for using the metal magnetic memory testing technique to evaluate the extent of material damages.