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相关概念视频

Fatigue01:21

Fatigue

239
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...
239
Bending of Members Made of Several Materials01:08

Bending of Members Made of Several Materials

261
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...
261
Microcracking in Concrete01:20

Microcracking in Concrete

208
Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
208
Method of Superposition01:20

Method of Superposition

1.2K
The method of superposition is a crucial technique in structural engineering, used to analyze the effect of multiple loads on beams. This approach involves calculating the deflection and slope for each load on a beam separately, and then summing these effects to determine the overall impact. It is applicable only when the beam material remains within its elastic limit, ensuring that deformations are linearly elastic.
When applying the method of superposition, each type of load—whether...
1.2K
Yield Criteria for Ductile Materials under Plane Stress01:25

Yield Criteria for Ductile Materials under Plane Stress

215
In designing structural elements and machine parts using ductile materials, it is crucial to ensure that these components withstand applied stresses without yielding. Yielding is initially determined through a tensile test, which evaluates the material's response to uniaxial stress. However, tensile stress is insufficient when components face biaxial or plane stress conditions This condition requires advanced criteria to predict failure.
The Maximum Shearing Stress Criterion, also known as...
215
Principal Stresses: Problem Solving01:15

Principal Stresses: Problem Solving

305
When analyzing two planes intersecting at right angles under the influence of shearing, tensile, and compressive stresses, it is essential to identify principal planes, maximum shearing stress, and principal stresses. To find the principal planes, apply a formula that equates them to twice the shearing stress divided by the difference between tensile and compressive stresses.
305

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相关实验视频

Updated: Sep 11, 2025

Cutting Procedures, Tensile Testing, and Ageing of Flexible Unidirectional Composite Laminates
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Cutting Procedures, Tensile Testing, and Ageing of Flexible Unidirectional Composite Laminates

Published on: April 27, 2019

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复合材料的跨尺度渐进性故障分析方法 包含界面相位效应的复合材料

Zhijie Li1, Fei Peng2, Jian Zhao1,3,4

  • 1Key Laboratory of AI-Aided Airworthiness of Civil Aircraft Structures, School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai 200092, China.

Materials (Basel, Switzerland)
|August 14, 2025
PubMed
概括

本研究介绍了纤维增强复合材料的跨尺度分析,结合接口效应来准确预测矩阵,纤维和接口故障. 这种新方法提高了预测准确度,并捕捉了接口故障模式,与传统的标准不同.

关键词:
这是一个复合材料.接口等价性对应性对应性渐进式故障是一个渐进式的故障.跨度尺度的跨度尺度

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Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
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Author Spotlight: Enhancing Fiber Composite Laminate Quality with the Wet Hand Lay-Up/Vacuum Bag Process
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相关实验视频

Last Updated: Sep 11, 2025

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Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
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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
  • 计算力学 计算力学 计算力学

背景情况:

  • 纤维增强复合材料由于不同的纤维和矩阵特性而表现出复杂的异构性行为.
  • 现有的宏观故障标准过于简化了复合故障,因为它不考虑微观事件.
  • 纤维和矩阵之间的接口在复合材料的性能和故障中发挥着关键作用.

研究的目的:

  • 开发一种跨尺度分析方法,将复合材料的接口相位效应纳入其中.
  • 为光纤矩阵接口建立一个相当的机械性质表征模型.
  • 为了能够同时预测光纤,矩阵和接口级别的故障模式.

主要方法:

  • 将接口阶段效应引入跨尺度分析框架.
  • 为接口阶段开发了一个相当的机械性质表征模型.
  • 使用宏微菌株转移方法进行跨尺度相关性.
  • 实施了微尺度故障标准,并采用了降低度的战略.
  • 使用Python和Abaqus 2020进行数值模拟.

主要成果:

  • 开发的跨尺度故障分析方法准确预测复合材料故障,包括矩阵,纤维和接口模式.
  • 与实验数据和现有标准 (林德,哈辛) 相比,数值模拟显示出良好的预测准确性.
  • 该方法独特地预测了光纤矩阵接口的故障模式,精度提高了2-3%.

结论:

  • 结合接口效应的跨尺度分析方法提供了对复合式故障机制的更全面的了解.
  • 这种方法显著提高了预测准确性,并捕捉了关键接口故障现象.
  • 开发的方法为设计和分析先进复合材料提供了有价值的工具.