Numerical and experimental study on the instability of unstiffened mild steel cone-cylinder assembly under simultaneously acting quasi-static axial compression and thermal load is presented in this paper. Results for one model subjected to axial compression were obtained first. Then, the combined action of axial compression and temperature was applied to the remaining four models. There was a good correlation between the experimental data and the numerically obtained buckling load for the cone-cylinders assembly. The percentage difference between experimental to the numerically predicted failure load ranges from +10% to −7%. Finally, the first combined stability domains for cone-cylinder assembly under combined axial compression and temperature was presented. Further study has been conducted to evaluate the buckling effect for cone-cylinder shell subjected to combined loading to the change of these parameters (i) dimensionless radius-to-thickness ratio, r_cyl/t, (ii) semi-vertex cone angle, β, and (iii) dimensionless cylinder length-to-cylinder radius ratio, L_cyl/r_cyl. Finally, the influence of structural initial imperfection also has been considered by following the recommendation of ECCS (2008).

提出了在同时作用准静态轴向压缩和热载荷作用下，未加筋的低碳钢锥筒总成不稳定性的数值和实验研究。首先获得一个经受轴向压缩的模型的结果。然后，将轴向压缩和温度的组合作用应用于其余四个模型。在实验数据和锥筒组件的数值计算屈曲载荷之间有很好的相关性。实验负载与数值预测负载之间的百分比差异范围为+ 10％至-7％。最后，提出了在组合轴向压缩和温度条件下用于圆锥圆柱体组装的第一个组合稳定性域。_cyl / t，（ii）半顶点锥角β，和（iii）无量纲的圆柱体长度与圆柱体半径之比L _cyl / r _cyl。最后，遵循ECCS（2008）的建议，还考虑了结构初始缺陷的影响。