仿生内部尖的能量吸收管,具有逐步增强的折叠变形模式
Shuang Zhang1, Zhengzhi Mu1,2, Wenda Song1
1Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun 130022, China.
Biomimetics (Basel, Switzerland)
|January 24, 2025
概括
受到竹子的启发,生物体内缩管 (BITT) 增强了精细管中的能量吸收. 这种设计可以防止曲,并通过可控折叠变形提高效率,性能优于常规管.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 生物力学 生物力学
背景情况:
- 精细的管道对于轻质结构至关重要,但在轴承负载下容易曲.
- 种植的竹子由于其独特的逐渐缩小的内部结构而表现出优越的能量吸收能力.
- 传统的细管缺乏高效的能量消耗机制,导致灾难性的故障.
研究的目的:
- 设计和评估一个由竹子启发的生物内部形管 (BITT),以提高轴向能量吸收.
- 在轴向压缩下分析BITT的能量吸收机制.
- 探索几何参数对BITT及其阵列结构的能量吸收性能的影响.
主要方法:
- 准静态轴向压缩测试以评估特殊能量吸收 (SEA).
- 理论计算和有限元素分析 (FEA) 以了解变形模式和能量吸收机制.
- 生物方形阵列 (BSA) 和生物六角阵列 (BHA) 结构的制造和测试.
主要成果:
- BITT的状内壁促进了渐进的折叠变形,防止曲并减少初始峰值负载.
- 与传统管相比,由于塑料变形增加,BITT显示了显著提高的能量吸收效率.
- 该研究探讨了缩角和长度-直径比对BITT的能量吸收能力的影响.
- 基于BITT的生物阵列 (BSA和BHA) 显示了整体能量吸收性能的提高.
结论:
- 生物体内缩管 (BITT) 有效地增强了能量吸收,并防止了细管中的曲故障.
- 状内部结构是通过可控折叠变形来改善能量消耗的关键.
- 比特 (BITT) 作为一个有前途的结构单元,用于开发先进的能吸收材料和结构.
相关概念视频
Deformation of Member under Multiple Loadings
153
When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
153
Deformations in a Transverse Cross Section
172
When a material is subjected to uniaxial stress, it elongates or contracts in the direction of the applied force, and also undergoes changes in the perpendicular directions. This behavior is crucial for understanding how materials behave under stress and is governed by mechanical properties such as Poisson's ratio v, which measures the ratio of transverse strain to axial strain.
As the material stretches, it expands or contracts in orthogonal directions to the load. This phenomenon varies...
As the material stretches, it expands or contracts in orthogonal directions to the load. This phenomenon varies...
172
Members Made of Elastoplastic Material
93
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...
93
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity
247
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.
247
Deformations in a Symmetric Member in Bending
161
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...
161
Bending of Members Made of Several Materials
139
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...
139


