生物灵感曲圆格子结构,提高机械性能和变形稳定性
Zhengmiao Guo1, Fan Yang1,2,3, Lingbo Li1
1School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai 200092, China.
Materials (Basel, Switzerland)
|September 14, 2024
概括
一种新的生物灵感曲圆 (BCE) 格子增强了轻质结构中的机械性能和稳定性. 这种设计优化了能量吸收,避免了灾难性的崩,超过了传统的格子结构.
科学领域:
- 材料科学与工程 材料科学与工程
- 机械工程 机械工程
- 添加剂制造 添加剂制造 添加剂制造
背景情况:
- 格子结构提供轻量化设计,具有高特异性机械性能,对于航空航天和汽车应用至关重要.
- 轻量级格子设计的一个关键挑战是平衡强度和刚度,往往导致权衡.
- 现有的格子设计可能会因为局部变形模式而遭受灾难性的崩.
研究的目的:
- 为了引入一种新的生物灵感曲圆 (BCE) 格子结构.
- 为了提高三维格子结构的机械性能和变形稳定性.
- 研究设计参数对 BCE 格子的机械行为和变形机制的影响.
主要方法:
- 使用选择性激光融 (SLM) 技术制造 BCE 格子样本.
- 制造样本的准静态压缩测试.
- 有限元 (FE) 数值模拟用于验证和参数分析.
主要成果:
- BCE格子结构表现出卓越的机械性能和稳定,可调节的变形模式.
- 在8%的相对密度下达到24.6 J/g的特定能量吸收 (SEA),显著超过了Octet和BCC网格.
- 与Octet和BCC格子相比,证明了更高的压缩力效率 (CFE),表明了更好的能量吸收特性.
结论:
- 欧洲央行网格设计有效地克服了轻质结构中的强度-度权衡.
- 参数调整 (峰数N,曲线幅度A) 允许控制变形模式,使曲主导,非局部化变形.
- 欧洲中央银行网格集成了拉伸和曲主导结构的优势,提供高能量吸收,刚性和抗破裂性.
相关概念视频
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity
253
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
253
Members Made of Elastoplastic Material
94
The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
As the bending moment...
As the bending moment...
94
Deformations in a Symmetric Member in Bending
164
When analyzing the deformation of a symmetric prismatic member subjected to bending by equal and opposite couples, it becomes clear that as the member bends, the originally straight lines on its wider faces curve into circular arcs, with a constant radius centered at a point known as Point C. This phenomenon helps to understand the stress and strain distribution within the member more clearly.
When the member is segmented into tiny cubic elements, it is observed that the primary stress...
When the member is segmented into tiny cubic elements, it is observed that the primary stress...
164
Plastic Deformations
84
It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
84
Bending of Members Made of Several Materials
143
In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each...
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each...
143
Bending of Curved Members - Strain Analysis
129
The mechanics of deformation in curved members, such as beams or arches, under bending moments, involve complex responses. When such a member, symmetric about the y-axis and shaped like a segment of a circle centered at point C, is subjected to equal and opposite forces, its curvature and surface lengths change significantly. This alteration results in the shift of the curvature's center from C to C', indicating a tighter curve.
The important part of bending analysis for such a member...
The important part of bending analysis for such a member...
129


