喷涂层对十字接头焊趾裂纹应力强度因子的影响

Effect of sprayed coatings on stress intensity factor of weld toe crack of cruciform welded joints

摘要: 利用有限元分析软件ANSYS分别建立了非承载十字接头焊趾裂纹的二维和三维断裂模型,并计算了焊趾裂纹尖端的应力强度因子。分析了等离子喷涂层弹性模量对裂纹尖端应力强度因子的影响,以及裂纹尺寸对裂纹尖端应力强度因子的影响。计算结果表明,等离子喷涂层使焊趾裂纹尖端应力强度因子明显降低。对于确定的裂纹尺寸、形状,裂纹尖端的应力强度因子随涂层弹性模量的增加而降低。当E_c/E_p=0.6,二维模型中a/t=0.125时,喷涂后裂纹尖端应力强度因子降低了62.5%;三维模型中a/t=0.125,a/c=0.2时,喷涂后裂纹尖端的应力强度因子降低了42.6%。

Abstract: Both two-dimensional and three-dimensional models were founded according to non-loaded cruciform welded joints.The stress intensity factors of weld toe cracks were calculated by using finite element analysis software ANSYS.The effects of elastic modulus of the sprayed coating and crack size on stress intensity factor was analyzed.The calculated results show that plasma sprayed coating is effective to decrease the stress intensity factor of weld toe.The stress intensity factor of a certain crack decreased while the elastic modulus of the sprayed coating increased.When E_c/E_p=0.6,the stress intensity factor of two-dimensional model decreases by 62.5%,and that of three-dimensional model decreases by 42.6%.