前言随着科学技术的飞跃发展,高强度钢制零件及中低碳钢制大型结构件的使用日益普遍,低应力脆断现象亦相应增加,因此迫使人们去认识并解决带裂纹构件的使用以及防止裂纹失稳扩展等问题。本文就瑞典HSEC-1.7×6多绳提升罐笼内含裂纹的连杆,应用断裂力学的方法进行安全性计算,寿命估算及裂纹扩展速率曲线(Lg da/dN-Lg△K)的使用范围和裂纹临界 Preface With the rapid development of science and technology, the use of high-strength steel parts and large and medium-sized structural steel parts made of low-carbon steel is becoming more common and the phenomenon of low-stress brittle fracture is also correspondingly increased, forcing people to understand and solve the use of cracked components and Prevent crack instability expansion and other issues. In this paper, the safety calculation, life estimation and crack growth rate curve (Lg da / dN-Lg △ K) are studied using the method of fracture mechanics for the cracked connecting rods in the HSEC-1.7 × 6 multi- Crack critical