Effects of residual stress on the stability of multi-welded integral stiffened panels

Yueling Guo ,Chunwei Kuang,Wenbo Sun,Yue Ma ,Ye Xue

doi:10.1051/jnwpu/20213930586

Abstract

In order to clarify the influence of residual stress on the stability of 2024-T3 friction stir welded(FSWed) integral stiffened panels with multi-welds, the ANSYS software was used to establish the finite element models of two typical multi-FSWed stiffened panels. The residual stresses of two typical multi-welded stiffened panels (Panel A and Panel B) were calculated respectively using the thermal-mechanical coupling method. And the buckling and post-buckling responses of the stiffened plates were analyzed. It is shown that the residual stress distribution of stiffened panel was affected by the welding sequence. The maximum residual stress of Panel A mainly appears on the right side of the stringer, and that of Panel B appears on the stringer that is welded later. The residual stress has a great influence on the stability of the welded stiffened panels. When the residual stress profiles are taken into consideration, the critical buckling loads of welded Panel A and Panel B will decrease 14.2% and 12.4% respectively.

Highlights

On mechanical properties of friction stir welded stiffened panel considering the effect of connection [ D]
[17] MURPHY A, LYNCH F, PRICE M, et al Modified stiffened panel analysis methods for laser beam and friction stir welded air⁃ craft panels[ J]

Summary

Introduction

郭妍宁1, 马玉娥1, 孙文博1, 薛勇2, 邝春伟2 (1.西北工业大学航空学院, 陕西西安 710072; 2.中航通飞华南飞机工业有限公司, 广东珠海 519000) 关键词:搅拌摩擦焊;加筋壁板;多焊缝;残余应力;稳定性; 承载力中图分类号:V214.4+ 2 文献标志码:A 文章编号:1000⁃2758(2021)03⁃0586⁃07 加筋壁板 A 残余应力输出路径 1 位于蒙皮上表面,路径 2 位于长桁上表面,如图 2 所示。由图 4a)可以看出,焊缝 1 焊接后,X 方向(焊缝 1 主应力方向) 残余应力最大值为 64 MPa。焊缝 2 焊接结束后,在距焊缝 2 左右两侧 10 mm 范围内应力值降低至 8 MPa。焊缝 3 焊接完成后,X 方向应力基本呈对称分布,焊缝 2 至焊缝 3 区域内应力值较为接近。 Y 方向残余应力曲线如图 4b) 所示,由计算结果可得,焊缝 1 在 Y 方向拉应力最大值为 22 MPa。焊缝 2 应力峰值在焊缝 2 焊接结束后达到 47 MPa。焊缝 3 焊接完成后,焊缝 3 应力峰值为 45 MPa,而焊缝 2 应力峰值降低至 24 MPa,降幅为 48.9%。焊缝 2 与焊缝 3 中点处应力值为-8 MPa。因此,加筋壁板 A 的残余应力分布受焊接顺序影响,残余应力主要集中在长桁右侧即焊缝 3 附近。

Results

Conclusion