冲压 － 钎焊法是一种制备 X 型点阵夹层结构的有效方法，但会产生钎焊残余热应力． 目前的研究未涉及残余热应力对该结构稳定性能的影响． 文中采用有限元模拟了 X型点阵夹层结构在压缩状态下的屈曲行为，分析中考虑了残余热应力，并计入了钎焊降温幅度及板件厚度的影响． 结果表明:增加板件厚度将提高结构的屈曲临界荷载，扩大屈曲时的塑性流动区;一般而言，该结构前屈曲状态分为线性变形和非线性变形 2 个阶段，残余热应力的存在将强化结构的线性变形，而弱化非线性变形，但对屈曲临界荷载影响不明显;增加钎焊的降温幅度、减小板件的厚度均可增强屈曲的残余热应力效应．

Folding-brazing is one of the efficient methods for fabricating X-type lattice sandwich structures.How-ever,it can cause thermal residual stress.Current researches have ignored the effect of the thermal residual stresson the structural stability.In this paper,a finite element method is adopted to simulate the buckling behavior of theX-type lattice sandwich structure in the state of compression under the thermal residual stress,and the effects of thebrazing temperature drop and the plate thickness are taken into account.The results show that (1) raising the platethickness helps to increase the buckling critical load of the structure and enlarge the plastic fluid zone of the struc-ture in the state of buckling; (2) in general,the pre-buckling behavior of the structure consists of linear and non-linear deformations; (3) the thermal residual stress can strengthen the linear deformability but weaken the non-linear deformability,and it has little effect on the buckling critical load; and (4) both raising the dropping range ofthe brazing temperature and decreasing the plate thickness can enhance the thermal residual stress effect.