钢-泡沫铝-纤维复合结构抗冲击性能数值分析
Numerical Analysis on Impact Properties of Steel-aluminum Foam-fiber Composite Structure
-
摘要:
采用数值模拟的方法研究了冲击荷载作用下钢-泡沫铝-纤维复合结构(以下简称复合结构)的动力响应特性，并着重考察了面板厚度和芯层厚度对复合结构抗冲击性能的影响，寻找其规律，比较分析同质量复合结构中前置钢板与泡沫铝材料质量比重对其冲击性能的影响，寻找前置钢板与泡沫铝最优质量比，并对这种复合结构进行优化设计，为工程实际提供数据依据。结果表明，一定质量范围内，增加钢板厚度对复合结构抗冲击性能的提升要优于同质量泡沫铝，但钢板与泡沫铝存在一个质量最优比，在平面尺寸9.2 m×9.2 m、120 t级的复合结构(PE纤维和后置钢板定量)中这个最优比在0.97：1附近。相同平面尺寸150 t级的复合结构，最优比在0.75：1～0.83：1之间，考虑工艺要求和造价，选择前置钢板9.5 cm、泡沫铝54 cm时综合性能更好，可以抵抗300 m/s初始速度弹体，具有一定安全储备，其重量只有钢筋混凝土结构的1/5.67，体积只有钢筋混凝土结构的17%且抗冲击性能较其更优越。 Abstract:The method of numerical simulation was used to study the dynamic response characteristics of steel-aluminum foam-fiber composite structure under the action of impact load. The influence of different panel thickness and core layer thickness on the impact resistance of the composite structure was investigated emphatically to find the rule. Compared the influnce with diferent ratio of aluminum foam sandwich plate and front plate in composite structure, optimal mass ratio was marked to optimize the design. In this case, it can provide data basis for engineering practice. It is indicated that: (1) Within the scope of a certain quality, the composite structure with increasing steel plate perform better than aluminum foam in impact resistance. However, there was a optimal quality ratio between steel plates and aluminum foam. The optimal quality ratio was about 0.97: 1 with 120 tons composite structure with sice of 9.2 m×9.2 m; (2) The optimal quality ratio was about 0.75: 1 ~ 0.83: 1 with 150 tons composite structure. As the front steel plate is 9.5 cm and aluminum foam is 54 cm, the combination property was achieved to resist 300 m/s velocity projectile considered technological requirements and cost. In this way, its weight is only 1/5.67 and volume is only 17% of the reinforced concrete structure under a certain safety reserve, and it can perform better in impact resistance.
下载:
