焊接变形与残余应力对科考吊机结构强度的影响

Effect of welding distortion and residual stress on structure strength of research crane

船用科考吊机是科考船科考操纵支撑系统的重要组成部分,但常规的科考吊机结构设计通常忽略焊接变形与残余应力的影响。文章以某科考吊机吊臂结构常用的加筋板结构为例,采用有限元方法,对比计算分析了考虑焊接影响及不计焊接影响时该结构的压缩极限强度,结果表明焊接过程对吊机结构的强度具有较大的不利影响,设计时有必要考虑焊接的影响。

Research crane is an important part of winch and handling system on research vessel, however, common structural design on research crane seldom take the effect of welding and residual stress into account. This paper compared the compressed ultimate strength of a stiffened plate model whichusuallyadoptedin lifting arm on research crane considering with that not considering welding distortion and residual stress by FEM, proved that welding distortion and residual stress could significantly reduce the ultimate strength of crane structure, the effect of welding should be taken into account during designing.