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Low-velocity impact response of 3D-printed lattice structure with foam reinforcement

机译：泡沫增强的3D打印晶格结构的低速冲击响应

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摘要

This paper presents an experimental study on low-velocity impact response of bi-material structures (BMS). BMS is a structural composite consisting of a 3D-printed lattice structure filled with a reinforcement material. In this study, BMS is made of polylactide (PLA) lattice structure and polyurethane (PU) foam for an enhanced impact resistance. Three different PU foams, including one rigid foam and two flexible foams, are selected for BMS. The impact tests are conducted to compare the impact attenuation, stiffness, toughness, and strength using the measured rate of change of acceleration (known as "jerk"), displacement, energy absorption, and the maximum acceleration, respectively. The results show that flexible foams have more positive effects on the impact properties than the rigid foam. The maximum reduction of jerk is about 9% compared to the baseline structure without foam reinforcement. The maximum displacement is increased by 17%; the maximum energy absorption is increased by 23%. The maximum acceleration remains similar for all samples. In conclusion, a proper selection of foam filling can significantly improve the impact properties.
机译：本文提出了一种双材料结构（BMS）的低速冲击响应的实验研究。 BMS是一种结构复合材料，由填充有增强材料的3D打印晶格结构组成。在这项研究中，BMS由聚乳酸（PLA）晶格结构和聚氨酯（PU）泡沫制成，以增强抗冲击性。 BMS选择了三种不同的PU泡沫，包括一种硬质泡沫和两种软质泡沫。使用测得的加速度（称为“冲击”），位移，能量吸收和最大加速度的变化率进行冲击测试，以比较冲击衰减，刚度，韧性和强度。结果表明，与硬质泡沫相比，软质泡沫对冲击性能的影响更大。与没有泡沫增强的基线结构相比，最大的跳动降低约为9％。最大排量增加了17％；最大能量吸收增加了23％。所有样品的最大加速度保持相似。总之，适当选择泡沫填充物可以显着改善冲击性能。

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