圆角化节点增强对BCC点阵结构力学性能的影响分析  

Effect of Filleted Reinforcement Lattice Joint on Mechanical Properties of BCC Lattice Structure

作　　者：郭祥 王晓阳 孙辽 胡全栋 GUO Xiang;WANG Xiaoyang;SUN Liao;HU Quandong(AVIC The First Aircraft Institute,Xi’an 710089,China;Northwestern Polytechnical University,Xi’an 710072,China;AVIC Manufacturing Technology Institute,Beijing 100024,China)

机构地区：[1]航空工业第一飞机设计研究院,西安710089 [2]西北工业大学,西安710072 [3]中国航空制造技术研究院,北京100024

出　　处：《航空制造技术》2024年第15期48-54,共7页Aeronautical Manufacturing Technology

摘　　要：针对传统体心立方(BCC)点阵结构支杆节点处几何突变引起应力集中过大,结构局部过早屈服问题,提出了一种提高点阵结构的等效屈服应力的圆角化节点增强点阵结构(BCC-F)设计方法。通过基于均匀化方法的数值仿真与3组Ti-6Al-4V BCC及BCC-F点阵试件的单轴压缩试验进行了验证。结果表明,圆角化节点增强能够实现点阵支杆节点处几何光滑过渡,并显著提高低密度BCC点阵结构的等效杨氏模量及等效屈服应力,并改变了破坏模式。在BCC及BCC-F相对密度分别为0.327及0.370时,后者等效杨氏模量及等效屈服应力的增幅分别达到142%及64%,BCC-F的破坏模式呈现出“多波峰”的坍塌特点。Aiming at the problem that the stress concentration at the sharp corners of lattice strut joints in conventional BCC lattice structures can lead to yield,this paper presents a design method of filleted BCC lattice structure(BCC-F)to reduce the stress concentration and ensure the structural safety for lattice structure.Validation was conducted through numerical simulation based on homogenization method and uniaxial compression tests on three groups of Ti–6Al–4V BCC and BCC-F lattice specimens.The results show that the filleted lattice joint can realize the geometrically smooth transition at the intersection of the lattice struts,and significantly improve the effective Young’s modulus and effective yield stress of the low-density BCC lattice structure,and change the failure mode of lattice structure.When the relative density of BCC and BCC-F were 0.327 and 0.370,the increase of effective Young’s modulus and effective yield stress of BCC-F were 142%and 64%,respectively,and the failure mode of BCC-F presented the characteristics of“multi-wave peak”collapse.

关 键 词：点阵结构 增材制造 均匀化方法 力学性能 单轴压缩 

分 类 号：V214[航空宇航科学与技术—航空宇航推进理论与工程]