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相关概念视频

Impact Loading01:19

Impact Loading

181
Impact loading occurs when a moving object collides with a stationary structure, such as a rod with a uniform cross-sectional area fixed at one end. Under these conditions, the rod absorbs the kinetic energy from the striking object, leading to deformation and subsequent stress development. As the rod returns to its original position and reaches maximum stress, the absorbed energy, initially manifested as kinetic energy, transforms entirely into strain energy.
In cases of elastic deformation,...
181
Impact Loading on a Cantilever Beam01:13

Impact Loading on a Cantilever Beam

363
The analysis of a cantilever beam with a circular cross-section subjected to impact loading at its free end illustrates the conversion of potential energy from a dropped object into kinetic energy, which is then absorbed by the beam as strain energy. This process is crucial for understanding how materials behave under dynamic loads, which is important in fields such as construction and aerospace.
When an object is dropped onto the free end of a cantilever, its potential energy due to gravity is...
363
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

242
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.
242
Fatigue01:21

Fatigue

171
Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
171
Stresses under Combined Loadings01:23

Stresses under Combined Loadings

138
When analyzing a bent tube with a circular cross-section subjected to multiple forces, it is crucial to determine the stress distribution in order to maintain structural integrity under varied load conditions.
The process begins by slicing the tube at critical points and analyzing the internal forces and stress components at these sections, focusing on the centroid. Normal stresses, generated by axial forces and bending moments, are either compressive or tensile and vary across the section from...
138
Eccentric Axial Loading in a Plane of Symmetry01:16

Eccentric Axial Loading in a Plane of Symmetry

159
Eccentric axial loading occurs when an axial load is applied away from the centroidal axis of a structural member. This scenario is common in engineering, where structural elements may not be directly aligned due to various design or functional requirements.
159

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A Testing Platform for Durability Studies of Polymers and Fiber-reinforced Polymer Composites under Concurrent Hygrothermo-mechanical Stimuli
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一种材料在循环负荷下动态增强承载能力和能量消耗能力.

Bohan Sun1,2, Grant Kitchen2,3, Dongjing He4

  • 1Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD, USA.

Science advances
|February 7, 2025
PubMed
概括

一种新的液体注入多孔压电支架 (LIPPS) 在循环负载下显著提高承载能力和能量消耗. 这种自我愈合的材料为各种应用提供了更好的弹性和可持续性.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 机械工程 机械工程
  • 生物材料是一种生物材料.

背景情况:

  • 在循环负荷下材料降解导致故障,增加成本.
  • 同时优化承载能力和能量消耗是具有挑战性的.
  • 现有的材料往往会在不同的性能特性之间进行权衡.

研究的目的:

  • 开发一种在循环负荷下增强承载能力和能量消耗的材料.
  • 调查开发的材料的自我愈合和改变形状的能力.
  • 探索软机器人,基础设施和组织工程中的应用.

主要方法:

  • 液体注入多孔压电支架 (LIPPS) 的制造.
  • 循环负荷测试用于评估超过1200万个循环的材料性能.
  • 计算机断层扫描 (CT) 研究分析微观结构变化.
  • 度分布分析和自我折叠实验.

主要成果:

  • 在1200万个循环后,LIPPS显示模量增加了3600%,hysteresis增加了3000%.
  • 在机械负荷下自我回收矿化被确定为关键机制.
  • 可重新编程的刚度分布使得自我折叠和形状生成成为可能.
  • 该材料表现出增强的弹性和可持续性.

结论:

  • 利普斯可以同时提高承载能力和能量消耗.
  • 自愈和形状变化的特性为材料设计开辟了新的途径.
  • 这一创新有望在软机器人,基础设施和再生医学方面取得重大进展.