包覆泡沫铝钢梁动态位移的计算及影响因素

Calculation and influence factors of dynamic displacement of aluminum foam coated beams

为考察运用FSI(流固耦合效应)能否考虑包覆泡沫铝对钢梁在爆炸荷载作用下最大动位移的影响及分析包覆泡沫铝衰减爆炸荷载作用下钢梁最大动位移的影响因素,运用理论及数值模拟方法分析了包覆泡沫铝钢梁在爆炸荷载作用下的动态位移变化情况。在验证理论及数值模拟结果可靠的基础上,对比理论结果与数值模拟计算结果的优缺点,并运用数值模拟分析影响包覆泡沫铝衰减钢梁在爆炸荷载作用下动位移的因素。结果表明:FSI可以考虑包覆材料对爆炸冲击波的衰减作用,但不能反映材料本身变化的影响(如材料厚度、屈服强度等);在计算包覆泡沫铝衰减爆炸荷载作用下钢梁最大动位移时,泡沫铝的厚度、屈服强度均具有最优解;增加刚性面板会放大包覆泡沫铝钢梁在爆炸荷载作用下的最大动位移。

In order to research whether FSI(short for Fluid-Structure Interaction)could be used to consider the influence of the aluminum foam coat of steel beams on its maximum dynamic displacement subjected to blast loading and to analyze the factors affecting the maximum dynamic displacement.The dynamic displacement of aluminum foam coated beams under blast loading is analyzed by theoretical analysis and numerical simulation.On the basis of reliable theoretical and numerical simulation results,the advantages and disadvantages of the two are compared,and the numerical simulation is used to analyze the factors that affect the dynamic displacement attenuation of the steel beam under blast loading.The results show that FSI can be used to consider the attenuation effect of the coat material on blast shock wave,but it cannot reflect the influence of the material's changing(such as material thickness,yield strength,etc.).When calculating the maximum dynamic displacement of the steel beam under the attenuation of blast load of aluminum foam,the thickness and yield strength of the aluminum foam have the best solutions.Increasing the rigid panel will enlarge the maximum dynamic displacement of the aluminum foam coated beam under blast load.