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首页> 外文会议>Fracture and strength of solids VII >Simulation of Compression and Spring-back Phenomena of Sandwich Structure with Honeycomb Core Subjected to Low Energy and Low Velocity Impact
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Simulation of Compression and Spring-back Phenomena of Sandwich Structure with Honeycomb Core Subjected to Low Energy and Low Velocity Impact

机译：低能量低速冲击的蜂窝芯夹芯结构压缩与回弹现象的模拟

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The paper proposes first to study the behavior of honeycomb alone under uniform cyclic compression-relaxation loading. It is found that the behavior is linear until it reaches the maximum force following by a sudden drop of force and at the end following by a constant force during the compression. This force-displacement behavior is observed to be similar for all material of honeycomb such as; Nomex (with different densities and cell dimensions), fiber-glass and aluminum. From experimental study, the behavior becomes significantly non-linear in the area of constant force (flat zone) especially the spring-back behavior. A mathematical model is proposed to simulate completely compression-spring-back behavior of honeycomb. This mathematical model describes the behavior of honeycomb in compression and spring-back loading only in function of the maximum depth due to impact. The proposed mathematical model is then integrated to FEA model to simulate the spring-back behavior of sandwich structure with metallic skins and honeycomb core. After integrating the influence of skin-honeycomb interaction, a complete mathematical model which includes non-linearity of compression-spring-back behavior and rotation due to skin-honeycomb interaction is proposed to simulate the behavior of sandwich structure subjected to low energy/ low velocity impact (indentation) loading using spherical impactor. Some simulations of indentation and relaxation on sandwich structure with nomex honeycomb using different diameters of spherical indenter and different thickness of metallic skin are obtained with a good comparison with experimental results.
机译：本文首先提出研究蜂窝在均匀循环压缩松弛应力作用下的行为。可以发现，在压缩过程中，该行为是线性的，直到其达到最大的力，随后是突然的力下降，最后是恒定的力。观察到这种力-位移行为对于所有的蜂窝材料都类似，例如： Nomex（具有不同的密度和像元尺寸），玻璃纤维和铝。从实验研究来看，该行为在恒力区域（平坦区域）变得明显非线性，尤其是回弹行为。提出了一个数学模型来完全模拟蜂窝的压缩回弹行为。这个数学模型描述了蜂窝在压缩和回弹载荷下的行为，仅取决于冲击引起的最大深度。然后将所提出的数学模型集成到FEA模型中，以模拟具有金属表皮和蜂窝状芯的三明治结构的回弹行为。在综合了皮蜂窝相互作用的影响后，提出了一个完整的数学模型，该模型包括非线性的压缩回弹行为和皮蜂窝相互作用引起的旋转，以模拟低能量/低速度下夹层结构的行为。使用球形冲击器的冲击（压痕）载荷。获得了使用不同直径的球形压头和不同厚度的金属蒙皮对nomex蜂窝状夹层结构进行压痕和弛豫的模拟，并与实验结果进行了比较。

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