CAJ | 학술논문

对拉剪电阻点焊试样进行了两级加载疲劳试验，试验中，第1组试件的2个载荷水平均在低周范围，第2组试件的一个载荷水平在低周范围，另一个在高周范围。结果表明，对于高-低加载，其存在过载延迟现象，并且在低-中高周疲劳的过程中，存在明显寿命增加的现象。利用线性损伤累积准则，分析了两级加载下的累积损伤规律和载荷幅值差异对于累积损伤的影响。
대랍전전조점한시양진행료량급가재피로시험，시험중，제1조시건적2개재하수평균재저주범위，제2조시건적일개재하수평재저주범위，령일개재고주범위。결과표명，대우고-저가재，기존재과재연지현상，병차재저-중고주피로적과정중，존재명현수명증가적현상。이용선성손상루적준칙，분석료량급가재하적루적손상규률화재하폭치차이대우루적손상적영향。
Tensile-shear spot welding samples under two level loading was tested,there were two groups of load level in the experiment,in the first group,two load levels were all in the low load level,in the second group,the other one was in the low load level,and it was in high load level.The results showed that there wais overload retardation phenomenon in high-low load,and the fatigue life at low-high cycle increased significantly.By using the linear cumulative damage rule,the cumulative damage law under two level loading was analyzed,and the differences of load amplitude for the effect of cumula-tive damage were also analyzed.