CAJ | 학술논문

对EH40钢进行疲劳裂纹扩展速率测试试验，测定一系列裂纹尺寸 ai及所对应的疲劳荷载次数N i和裂纹嘴张开位移（CMOD）。通过 a‐N曲线，运用ORIGIN软件的微分功能得到试样的裂纹扩展速率。通过CMOD与裂纹尖端张开位移（CTOD）的对应关系，得到裂纹扩展过程中的一系列CTOD的值δ。通过数据分析，表明裂纹扩展速率与裂纹尺寸存在指数关系，并与δ存在线性相关。在此基础上，提出新的裂纹扩展速率公式，避免了Paris公式的局限性。
대EH40강진행피로렬문확전속솔측시시험，측정일계렬렬문척촌 ai급소대응적피로하재차수N i화렬문취장개위이（CMOD）。통과 a‐N곡선，운용ORIGIN연건적미분공능득도시양적렬문확전속솔。통과CMOD여렬문첨단장개위이（CTOD）적대응관계，득도렬문확전과정중적일계렬CTOD적치δ。통과수거분석，표명렬문확전속솔여렬문척촌존재지수관계，병여δ존재선성상관。재차기출상，제출신적렬문확전속솔공식，피면료Paris공식적국한성。
In this paper ,EH40 steel fatigue crack growth rate test was conducted .A series of crack size(ai) and the number of fatigue loads(Ni) were measured ,as well as CMOD .By making a‐N curves ,the differential function of ORIGIN software was used to obtain the crack growth rate of the samples .Through the corresponding relationship between CMOD and CTOD ,a series of CTOD values during crack propagation was obtained . The results of data analysis indicated that there is an exponential relationship between the crack growth rate and the crack size .It also showed that there is a linear correlation between the crack growth rate and CTOD value .The new crack growth rate formula was put forward so as to prevent the limitations of Paris formula .