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FH36船板钢抗疲劳性能分析
Analysis of Fatigue Resistance of FH36 Ship Plate Steel
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- DOI:
- 作者:
- 王孙中
wangsunzhong
- 作者单位:
- 辽宁科技大学
University of Science and Technology Liaoning
- 关键词:
- FH36; 疲劳裂纹扩展速率; 断裂韧性; 应力强度因子; ANSYS
FH36; Fatigue crack propagation; Fracture toughness; Stress intensity factor; ANSYS
- 摘要:
- 为了保障远洋船舶的安全性,对船板钢的抗疲劳性能研究具有实际意义和理论价值。采用实验的方法分析了FH36船板钢的疲劳裂纹扩展速率和疲劳断裂韧性,采用双对数线性拟合法和J积分法计算了FH36钢的Paris公式与疲劳断裂韧性值。采用SEM观察了FH36疲劳裂纹扩展和疲劳断裂韧性断口特征,分析了疲劳断裂韧性断口形貌为微孔聚合断裂机制。基于ANSYS对疲劳裂纹扩展过程进行了数值模拟,发现裂纹长度与裂纹前缘应力强度因子幅值之间的变化趋势与试验一致。该模拟方法对预测材料的疲劳扩展速率有一定的参考价值
In order to guarantee the safety of ocean-going ships, it has practical significance and theoretical value to study the anti-fatigue performance of ship plate steel. The fatigue crack growth rate and fatigue fracture toughness of FH36 ship plate steel were analyzed experimentally. The Paris formula and fatigue fracture toughness of FH36 steel were calculated by log-log-linear fitting method and j-integral method. The fatigue crack propagation and fracture toughness of FH36 were observed by SEM, and the fracture morphology of fatigue fracture toughness was analyzed as micropore polymerization fracture mechanism. The fatigue crack propagation process was simulated numerically based on ANSYS, and it was found that the variation trend between the crack length and the stress intensity factor amplitude of the crack front was consistent with the experiment. The simulation method has certain reference value for predicting the fatigue growth rate of materials.