### 增材制造钛合金微桁架夹芯板低速冲击响应

1. 西北工业大学 航空学院, 西安 710072
• 收稿日期:2020-01-10 修回日期:2020-02-03 发布日期:2020-03-26
• 通讯作者: 马玉娥 E-mail:ma.yu.e@nwpu.edu.cn
• 基金资助:
国家自然科学基金（91860128）；陕西省创新能力支撑项目（2018KW-028）

### Low velocity impact response of additively manufactured titanium alloy micro-truss sandwich panels

GUO Yidong, MA Yu'e, LI Peiyao

1. School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China
• Received:2020-01-10 Revised:2020-02-03 Published:2020-03-26
• Supported by:
National Natural Science Foundation of China (91860128);Shaanxi Provincial Innovation Capability Support Project (2018KW-028)

Abstract: Additive manufacturing technology is capable of molding complex lattice structures at one time, overcoming the debond problem at the connection point of the core layer and the surface layer of the traditional technology under low-velocity impact. Low-velocity impact tests were performed on additively manufactured Face-Centered Cube (FCC) sandwich panels and Body-Centered Cube (BCC) sandwich panels respectively, using a drop-weight test device, from which the failure mode and impact curves of the sandwich panels were obtained. The smaller indentation depth on BCC sandwich panels than that on FCC sandwich panels under the same energy impact indicates better impact resistance of BCC than FCC sandwich panels. Under low-velocity impact, a pit and a crack appeared at the impact site on the upper layer of the lattice sandwich. However, no large deformation occurred in the rest of the area. A finite element model was developed to simulate the impact response of lattice sandwich panels. For both panels, the impact energy is mainly absorbed by the upper layer and the sandwich layer, with the energy absorption ratio of each part changing little when the impact energy changes. Thus the overall structure of both BCC and FCC sandwich panels is stable and integral. The damage of the FCC sandwich panel initiates from the connection between the upper layer and the vertical truss, while that of the BCC sandwich panel initiates from the vertical truss.