CAJ | 학술논문

对2024-T3铝合金搅拌摩擦焊接加筋壁板的剪切稳定性能进行试验研究，得到该结构的剪切失稳形式及屈曲载荷、承载能力及破坏形式。应用有限元法对该焊接加筋壁板结构进行简化建模，对该结构的稳定性和承载能力进行计算，将计算结果与试验结果进行比较。试验及有限元计算结果表明，结构的剪切失稳形式表现为筋条间平板的局部屈曲；屈曲后结构进入张力场受力状态，破坏形式主要表现为平板的塑性变形和边缘撕裂、筋条的弯扭变形以及焊接区的局部脱焊；出现脱焊现象的试验件其承载能力较未出现脱焊现象的试验件下降7.7%；线性和非线性屈曲计算所得屈曲载荷分别比试验平均值高出18.4%和26.2%，而非线性计算所得承载能力比试验平均值高出5.7%，焊接引起的初始缺陷对结构承载能力的影响小于对屈曲载荷的影响；有限元分析得到的结构屈曲形式和失效形式与试验现象吻合，验证了有限元模型的合理性，但其仍需要进一步改进以考虑初始缺陷来减小计算误差。
대2024-T3려합금교반마찰한접가근벽판적전절은정성능진행시험연구，득도해결구적전절실은형식급굴곡재하、승재능력급파배형식。응용유한원법대해한접가근벽판결구진행간화건모，대해결구적은정성화승재능력진행계산，장계산결과여시험결과진행비교。시험급유한원계산결과표명，결구적전절실은형식표현위근조간평판적국부굴곡；굴곡후결구진입장력장수력상태，파배형식주요표현위평판적소성변형화변연시렬、근조적만뉴변형이급한접구적국부탈한；출현탈한현상적시험건기승재능력교미출현탈한현상적시험건하강7.7%；선성화비선성굴곡계산소득굴곡재하분별비시험평균치고출18.4%화26.2%，이비선성계산소득승재능력비시험평균치고출5.7%，한접인기적초시결함대결구승재능력적영향소우대굴곡재하적영향；유한원분석득도적결구굴곡형식화실효형식여시험현상문합，험증료유한원모형적합이성，단기잉수요진일보개진이고필초시결함래감소계산오차。
Shear experiment on friction stir welded 2024-T3 aluminum alloy stiffened panel specimens is conducted to obtain the buckling behavior and carrying capability of the structure. Finite element method(FEM) is applied to analyze the stability performance of the simplified structure model and the results are compared with experimental results. It is found that, buckling mode of the structure is local buckling of plate between stiffeners, post-buckling mode is under the state of diagonal tension, the failure patterns mainly contain the plastic deformation and tearing of plate, distortion of stiffeners and local weld debonding. Average carrying capability of specimens failed with weld debonding is 7.7%lower than that of other specimens. Buckling loads obtained by linear and nonlinear analysis are separately 18.4% and 26.2% higher than average experimental result, while carrying capability obtained by nonlinear analysis is 5.7%higher than average experimental result, which indicates that the carrying capability is less sensitive to the weld induced initial imperfections than buckling load. Buckling mode and failure pattern obtained by FEM accords well with experimental phenomenon, which validates the rationality of the finite element model, however, it still needs to be further modified to account for weld induced imperfections to reduce the calculation errors..