Li Hao, Wang Zhenqing, Yu Zhengwei, Sun Min, Liu Yanfei
College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, China.
State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China.
Materials (Basel). 2018 Oct 24;11(11):2076. doi: 10.3390/ma11112076.
Most foam core sandwich panels are sensitive to the impact load because of the poor toughness of thin composite face-sheets and the low strength of foam core. Superelastic shape memory alloy (SMA) wires have been applied to enhance the impact damage resistance of composite laminates in recent decades. To improve the impact damage resistance of foam core sandwich panels and to protect the foam core, SMA wires were incorporated into the face-sheets of foam core sandwich panels in this work. Eight new types of SMA hybrid sandwich panels were designed, and low-velocity impact tests were carried out at an impact energy of 35 J. The damage morphology of the impacted sandwich panels was identified by visual inspection and scanning electron microscope technology. Results indicate that the impact damage resistance of the SMA hybrid sandwich panels is enhanced. The damage area in the hybrid sandwich panels is greatly reduced and a decrease of 85.63% can be reached in the bottom face-sheet. The maximum contact force has an improvement of 28.15% when the two layers of SMA wires are incorporated into the bottom face-sheet.
大多数泡沫芯夹芯板对冲击载荷敏感，这是因为薄复合面板的韧性较差且泡沫芯强度较低。近几十年来，超弹性形状记忆合金（SMA）丝已被用于提高复合材料层压板的抗冲击损伤能力。为了提高泡沫芯夹芯板的抗冲击损伤能力并保护泡沫芯，在本研究中，将SMA丝加入到泡沫芯夹芯板的面板中。设计了八种新型SMA混合夹芯板，并在35 J的冲击能量下进行了低速冲击试验。通过目视检查和扫描电子显微镜技术确定了受冲击夹芯板的损伤形态。结果表明，SMA混合夹芯板的抗冲击损伤能力得到了增强。混合夹芯板中的损伤面积大大减小，底面损伤面积可减少85.63%。当在底面加入两层SMA丝时，最大接触力提高了28.15%。
