高强度焊接结构钢的疲劳裂纹扩展抗力

Resistance of Fatigue crack extending of High-strength Structure Steel

该文以三种785MPa级焊接结构钢为对象,研究了其疲劳裂纹扩展行为.结果表明,影响其疲劳裂纹扩展抗力的主要因素为夹杂物含量,降低夹杂物含量是提高疲劳裂纹扩展抗力的有效途径.

This paper takes three kinds of 785 MPa qrade welded structure steel as an object, researches on its fatigue crack extending charaster. The results shows that the main factor affecting the resistance of fatigue crack extending is content of melusion. Reducing content of inclusion is an effective way to raise resistance of fatigue crack extending.