论文标题
撑杆波动对晶格材料拉伸响应的影响
The influence of strut waviness on the tensile response of lattice materials
论文作者
论文摘要
添加剂制造方法的最新进展使得实现所需的应力与应变反应的复杂微体积固体是可能的。在这里，我们报告了实验测量和相关的有限元（FE）计算对支柱形状对由低碳钢板制成的二维（2D）晶格的拉伸反应的影响。考虑了两个晶格拓扑：（i）一个伸展主导的三角形晶格和（ii）弯曲主导的六边形晶格。发现撑杆波动可以增强每个晶格的延展性，特别是对于弯曲的六角形晶格。制造瑕疵（例如底切）对晶格的延展性有很小的影响，但可以显着降低最终的拉伸强度。 FE模拟提供了对这些观察结果的更多见解，并用于构建设计图，以帮助具有指定强度和延展性的晶格设计。
Recent advances in additive manufacturing methods make it possible, for the first time, to manufacture complex micro-architectured solids that achieve desired stress versus strain responses. Here, we report experimental measurements and associated finite element (FE) calculations on the effect of strut shape upon the tensile response of two-dimensional (2D) lattices made from low-carbon steel sheets. Two lattice topologies are considered: (i) a stretching-dominated triangular lattice and (ii) a bending-dominated hexagonal lattice. It is found that strut waviness can enhance the ductility of each lattice, particularly for bending-dominated hexagonal lattices. Manufacturing imperfections such as undercuts have a small effect on the ductility of the lattices but can significantly reduce the ultimate tensile strength. FE simulations provide additional insight into these observations and are used to construct design maps to aid the design of lattices with specified strength and ductility.
