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相关概念视频

Design of Prismatic Beams for Bending01:23

Design of Prismatic Beams for Bending

241
The design of prismatic beams, structural elements with a uniform cross-section, focuses on ensuring safety and structural integrity under load. The design process begins by determining the allowable stress, either from material properties tables, or by dividing the material's ultimate strength by a safety factor. This safety factor is essential for accommodating uncertainties, and varies depending on the material—timber, steel, or concrete—with each having unique strength and...
241
Residual Stresses in Bending01:18

Residual Stresses in Bending

177
In the study of elastoplastic members subjected to bending moments, understanding the loading and unloading phases is crucial for assessing material behavior and structural integrity. During the loading phase, as the bending moment increases, the material initially responds elastically, adhering to Hooke's Law, where stress is directly proportional to strain. When the load exceeds the yield strength, plastic deformation occurs, resulting in permanent strain and deformation that remains even...
177
Bending of Curved Members - Strain Analysis01:14

Bending of Curved Members - Strain Analysis

138
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...
138
Flexural Stress01:16

Flexural Stress

252
When analyzing bending in symmetric members, it's crucial to understand how stresses distribute when subjected to bending moments. This stress distribution is effectively described by applying fundamental mechanics and material science principles, particularly Hooke's Law for elastic materials.
Hooke's Law states that within the material's elastic limits, stress is directly proportional to strain. In a member experiencing a bending moment, the strain at any point is relative to...
252
Principal Stresses in a Beam01:11

Principal Stresses in a Beam

306
In prismatic beams subject to arbitrary transverse loading, It is essential to analyze the interaction between shear forces and bending moments in order to understand stress distribution and ensure structural integrity. The highest normal or bending stress occurs at the outer fibers of the beam, decreasing linearly to zero at the neutral axis. In contrast, shear stress peaks at the neutral axis and diminishes toward the outer surfaces.
Analyzing principal stresses is crucial, especially in...
306
Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

195
As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
195

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Updated: Jul 10, 2025

Mechanoluminescent Visualization of Crack Propagation for Joint Evaluation
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导向波特征研究和复杂的多层弦合物关节结构中的概率裂纹评估.

Jian Chen1, Yusen Xu1, Shenfang Yuan1

  • 1Research Center of Structural Health Monitoring and Prognosis, State Key Laboratory of Mechanics and Control for Aerospace Structures, Nanjing University of Aeronautics and Astronautics, 29 Yudao Street, Nanjing 210016, China.

Sensors (Basel, Switzerland)
|November 25, 2023
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种新的方法,用于使用引导波来检测隐藏的飞机结构中的损伤. 高斯工艺方法准确地识别了多层,多钉接头的裂.

关键词:
导向波浪的导向波浪是指导波浪的导向波浪.多层多层的多个钉的多个钉路径波段的特征是路径波段的特征.概率式采矿诊断 概率式采矿诊断是一种采矿诊断.

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Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
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Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation
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相关实验视频

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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:

  • 航空航天工程 航空航天工程
  • 结构健康监测 结构健康监测
  • 非破坏性测试 不破坏性测试

背景情况:

  • 多层和多钉结构对于飞机的完整性至关重要,但难以检查.
  • 以导向波为基础的结构健康监测 (SHM) 提供了检测无法进入的飞机部件损坏的潜力.
  • 现有的SHM方法在多层,多接头的复杂边界条件下面临挑战.

研究的目的:

  • 为了研究多层串联接关节 (MLSSJ) 结构中的引导波传播.
  • 开发用于MLSSJs的引导波SHM的传感器布局准则.
  • 为MLSSJs提出和验证一种概率损害诊断方法.

主要方法:

  • 在MLSSJ中导向波传播的全面实验和数值模拟.
  • 针对MLSSJ复杂性的传感器布局规则的开发.
  • 应用基于高斯过程 (GP) 的概率方法,利用路径波段特征进行损伤诊断.

主要成果:

  • 在MLSSJ结构中建立了引导波传播特征.
  • 已验证的传感器布局规则用于MLSSJ中有效的SHM.
  • 证明了基于GP的概率方法的有效性,在裂长度诊断中达到1.5mm的最大根平均平方误差.

结论:

  • 这项研究为复杂的MLSSJ结构中的引导波行为提供了新的见解.
  • 开发的传感器布局规则和基于GP的诊断方法对飞机中的SHM有效.
  • 这项研究提升了对关键,隐藏的飞机部件的在线损坏监测能力.