焊缝强度匹配对铝合金焊接接头三向应力度分布的影响

用有限元软件ABAQUS对不同焊缝强度匹配的6063铝合金焊接接头进行拉伸模拟,研究了焊缝强度匹配对焊接接头中三向应力度分布的影响.同时,在每种强度匹配条件下,研究了HAZ宽度对焊接接头中三向应力度分布的影响.结果表明,与母材相比,不同焊缝强度匹配的焊接接头中应力状态较为复杂,三向应力度在母材与HAZ交界处和焊缝与HAZ交界处存在突变;高强匹配接头中三向应力度最大值最高,低强匹配接头中三向应力度最大值最小;等强匹配条件下,随着HAZ宽度的增大,三向应力度最大值的位置从母材与HAZ交界处转变为焊缝与HAZ的交界处;高强匹配条件下,三向应力度的最大值都出现在焊缝与HAZ的交界处,随着HAZ宽度增大,三向应力度的最大值逐渐减小;低强匹配条件下,三向应力度的最大值都出现在母材与HAZ的交界处,随着HAZ宽度增大,三向应力度的最大值逐渐减小.

Influence of weld strength match on distribution of stress triaxiality for aluminum alloy welded joint

The tensile simulation was carried out on 6063 aluminum alloy welded joint with different weld strength matches with software ABAQUS, and the influence of weld strength matchon the distribution of stress triaxiality in aluminum alloy welded joint was studied. At the same time, the influence of HAZ width on the distribution of stress triaxiality in welded joint was studied in each strength match condition. The results indicate that the stress state in welded joints with different weld strength matches was complicated, compared to the base material. Bounce in the stress traxiality existed in the boundary between the base material and HAZ and between the weld and HAZ. The maximum of stress traxiality in high strength match welded joint was the largest. On the contrary, the maximum of stress traxiality in low strength match welded joint was the least. Under the condition of equal strength match, the position of the maximal stress traxiality changed from the boundary between the base material and HAZ to the boundary between the weld and HAZ with the increasing of the width of HAZ. Under the condition of high strength match, the maximum of stress traxiality appeared in the boundary between the weld and HAZ, and the maximum of stress traxiality reduced gradually with the increasing of the width of HAZ. However, under the condition of low strength match, the maximum of stress traxiality appeared in the boundary between the base material and HAZ, and the maximum of stress traxiality also reduced gradually with the increasing of the width of HAZ.