CAJ | 학술논문

对新型 ADB610低碳贝氏体钢进行了焊条电弧焊接，采用柔度法得到了焊接接头裂纹长度(a )和循环寿命(N )的关系曲线；根据 a-N 曲线采用一次七点递增多项式拟合方法计算了母材、热影响区和焊缝的疲劳裂纹扩展速率(da/dN )，并和应力强度因子范围(ΔK )数据进行回归拟合，得到了以 Paris 公式表达的焊接接头各区域的疲劳裂纹扩展速率表达式。结果表明：在疲劳裂纹扩展的初期和中期，焊缝的裂纹扩展速率最慢，母材区裂纹扩展速率最快；在裂纹扩展末期，三区域的裂纹扩展速率相近。
대신형 ADB610저탄패씨체강진행료한조전호한접，채용유도법득도료한접접두렬문장도(a )화순배수명(N )적관계곡선；근거 a-N 곡선채용일차칠점체증다항식의합방법계산료모재、열영향구화한봉적피로렬문확전속솔(da/dN )，병화응력강도인자범위(ΔK )수거진행회귀의합，득도료이 Paris 공식표체적한접접두각구역적피로렬문확전속솔표체식。결과표명：재피로렬문확전적초기화중기，한봉적렬문확전속솔최만，모재구렬문확전속솔최쾌；재렬문확전말기，삼구역적렬문확전속솔상근。
The ADB610 steel was welded using shielded metal arc welding method,and the fatigue crack length (a )vs.fatigue life (N )curves was measured by using crack compliance method.Base on a-N curves,the fatigue crack propagation rates of each sample from base material (BM),heat affected zone (HAZ)and weld seam (WS)were calculated by fitting a polynomial to a strip of 7 data points and linear regression fitted with stress intensity factor range (ΔK ).The formula based on Paris of (da/dN )and (ΔK )was obtained.The results show that the fatigue crack growth rate in BM was higher than that in HAZ and WS,and that in WS was the slowest during the early and middle stage of crack growth;during the last stage of crack growth the difference of fatigue crack growth rate in three regions was not significant.