以平衡型稳定网络为约束条件,以等强度和提高临界失稳载荷为设计目标,对夹层复合材料圆柱壳体的缠绕表层进行了优化研究.首先,基于等强度设计,得到表层的最优缠绕方式为螺旋加环型缠绕,且螺旋缠绕角应满足α≤54.7°;其次,以结构强度及稳定性为双重指标,采用ABAQUS建立有限元模型,求解不同长径比的夹层复合材料圆柱壳的最优螺旋缠绕角αopt.研究发现:当长径比0.5≤η≤3时,随η增加,表层的最优缠绕方式从单一螺旋加环型缠绕过渡至纵向铺放加环向缠绕,且最大临界失稳载荷Pcr近似呈二次递减关系.该优化方法不仅可达到轻量化要求,而且满足结构强度和稳定性双重指标.
Based on the balanced stable network as constraint conditions,with equal strength designing and improving the critical buckling load as the design goals,wound surface of sandwich composite cylinder was optimized.Firstly,based on equal strength design method,the optimal winding pattern and winding angles of spiral winding were obtained.The winding angle should satisfy α≤54.7°.Secondly,in order to meet the need of structural strength and stability,stability models with different aspect ratio are established using ABAQUS finite element software to obtain the αopt.The study has found that when the aspect ratio 0.5 ≤η≤3,with the increase of η,the best way transited from a single wound spiral wound ring plus hoop wound to the longitudinal placement plus hoop wound,while the maximum critical buckling load is approximately decreasing in quadratic relationship.The optimization method can not only achieve weight reduction requirements,but also meet the dual indicators of structural strength and stability.
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