CAJ | 학술논문

通过对40Cr 材料光滑试样进行不同加载次序的三级程序载荷疲劳试验，验证并分析了载荷作用次序对疲劳强度累积强化效果的影响。试验结果表明：按照载荷从小到大逐渐增加的次序加载时，锻炼载荷对疲劳强度的累积强化效果最大，并且与三级锻炼载荷分别独立作用时强化效果的叠加值接近；而在其他加载次序下，累积强化效果分别受到不同程度的影响。最后，通过对疲劳试验数据的统计分析，初步研究了谱载荷下加载次序对总体累积强化效果的修正系数，并对之前建立的随机载荷下累积强化效果模型做出了修正，为建立考虑低载强化效应的疲劳累积理论进行了探索。
통과대40Cr 재료광활시양진행불동가재차서적삼급정서재하피로시험，험증병분석료재하작용차서대피로강도루적강화효과적영향。시험결과표명：안조재하종소도대축점증가적차서가재시，단련재하대피로강도적루적강화효과최대，병차여삼급단련재하분별독립작용시강화효과적첩가치접근；이재기타가재차서하，루적강화효과분별수도불동정도적영향。최후，통과대피로시험수거적통계분석，초보연구료보재하하가재차서대총체루적강화효과적수정계수，병대지전건립적수궤재하하루적강화효과모형주출료수정，위건립고필저재강화효응적피로루적이론진행료탐색。
According to the three level program load fatigue test on the 40Cr material smooth specimens with different loading sequences,the influences of load sequence on cumulative fatigue strengthening effect were verified and analyzed.The test results show that,in accordance with the se-quence from small to large loads,the exercise loads caused the maximum cumulative fatigue strength-ening effect,which approached to the added value of three exercise load’s strengthening effects inde-pendently.Whereas in other load sequences,the cumulative strengthening effect were decreased in different degrees.Finally,based on the statistical analysis of fatigue test data,a correction factor 毲was proposed,which expressed the influences of spectrum load sequence on overall cumulative strengthening effect.Moreover,the previous fatigue cumulative strengthening effect model under the random load was modified,which made a deep study of fatigue cumulative theory considering load streng the ningeffect.