A comprehensive investigation on the effects of laser and shot peening on fatigue crack growth in friction stir welded AA 2195 joints
A comprehensive investigation on the effects of laser and shot peening on fatigue crack growth in friction stir welded AA 2195 joints
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DOI：
10.1016/j.ijfatigue.2008.03.029
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发表时间：
2009-05-01
影响因子：
6
通讯作者：
Hatamleh, Omar
中科院分区：
文献类型：
--
作者：
Hatamleh, Omar
研究了不同表面处理工艺对2195铝合金搅拌摩擦焊接疲劳裂纹扩展性能的影响。目的是降低疲劳裂纹扩展速率，提高焊接接头的疲劳寿命。在应力比(R)为0.1和0.7时，对不同强化条件下的裂纹扩展速率进行了评估和表征。研究并给出了焊缝各区域的表面残余应力分布和贯穿厚度残余应力分布。在焊接过程中引入的拉伸残余应力被发现变得明显压缩，特别是在激光强化后。压应力的作用被认为是提高焊缝抗疲劳裂纹扩展能力的原因。结果表明，与喷丸强化和原生焊接试样相比，激光强化能显著降低疲劳裂纹扩展速率。这种降低的疲劳裂纹扩展速率与未焊接的基体材料相当。Elsevier Ltd.出版。
The effects of various surface treatment techniques on the fatigue crack growth performance of friction stir welded 2195 aluminum alloy were investigated. The objective was to reduce fatigue crack growth rates and enhance the fatigue life of welded joints. The crack growth rates were assessed and characterized for different peening conditions at a stress ratio (R) of 0.1, and 0.7. The surface and through-thickness residual stress distribution were also investigated and presented for the various regions in the weld. Tensile residual stresses introduced during the welding process were found to become significantly compressive, particularly after laser peening. The effect of the compressive stresses was deemed responsible for increasing the resistance to fatigue crack growth of the welds. The results indicate a significant reduction in fatigue crack growth rates using laser peening compared to shot peening and native welded specimens. This reduced fatigue crack growth rate was comparable to the base unwelded material. Published by Elsevier Ltd.