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相关概念视频

Temperature Dependent Deformation01:12

Temperature Dependent Deformation

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In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
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Method of Joints: Problem Solving I01:30

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The method of joints is a commonly used technique to analyze the forces in structural trusses. The method is based on the principle of equilibrium, which assumes that the truss members are connected by frictionless pins. The forces at each joint can be determined by considering the equilibrium of the forces acting on that joint. Consider a truss structure with two forces of 20 N and 10 N acting at joints C and D, respectively. The method of joints can be used to determine the forces FCB, FDC,...
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Method of Joints: Problem Solving II01:30

Method of Joints: Problem Solving II

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Consider a truss structure with frictionless joints fixed to a wall and roller support. If a force of 150 N is applied to joint A, the forces in each member of the truss can be determined using the method of joints.
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Two-Dimensional Force System: Problem Solving01:29

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Solving problems related to two-dimensional force systems is an essential aspect of mechanics and engineering. By applying the principles of vector analysis and force equilibrium, one can determine the effect of multiple forces acting on an object in a two-dimensional space.
The first step to solving a two-dimensional force system problem is to draw a free-body diagram of the object under consideration. This diagram helps identify all the external forces acting on the object, including their...
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Three-Dimensional Force System:Problem Solving01:30

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A three-dimensional force system refers to a scenario in which three forces act simultaneously in three different directions. This type of problem is commonly encountered in physics and engineering, where it is necessary to calculate the resultant force on the system, which can then be used to predict or analyze the behavior of the object or structure under consideration.
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Shear and Bending Moment Diagram: Problem Solving01:24

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When analyzing a beam supporting concentrated loads and a distributed load, drawing the shear and bending moment diagrams is essential. These diagrams help understand the internal forces and moments acting on the beam, which is crucial for designing safe and efficient structures. Follow these steps to create the shear and bending moment diagrams:
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桥梁实验和缺陷力学:用于配置力分析的数据驱动工具箱.

Abdalrhaman Koko1,2, Alya Abdelnour3, Thorsten H Becker4

  • 1National Physical Laboratory, Hampton Road, Teddington, TW11 0LW UK.

Engineering with computers
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概括

本研究介绍了用于分析材料缺陷的 MATLAB 工具箱. 它直接从实验数据中提取断裂力学参数,使各种材料的裂和失位的几何独立表征成为可能.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 计算力学 计算力学 计算力学
  • 固体力学 固体力学是什么

背景情况:

  • 预测材料故障需要了解缺陷的机械行为.
  • 传统的断裂力学依赖于在实验环境中经常无法满足的假设.

研究的目的:

  • 开发一个计算工具箱,从实验数据中提取配置力和混合模式应力强度因子 (SIF).
  • 为了使复杂材料中缺陷行为的几何独立表征.

主要方法:

  • 一个基于MATLAB的工具箱,实现路径独立的能量积分 (J和M积分).
  • 新模式分解用于隔离模式 I-III SIF 的贡献.
  • 直接分析实验测量的位移或变形梯度场 (例如,DIC,H-EBSD).

主要成果:

  • 证明了微裂,位移和疲劳裂的强大,独立于几何形状的特征.
  • 成功应用于异构和复杂材料.
  • 框架是无关材料的,直接运行在实验领域.

结论:

  • 该工具箱促进了对缺陷行为的数据驱动分析,克服了传统方法的局限性.
  • 在小应变动力学下适用于线性和异型弹性/弹性塑料材料 (金属,陶).
  • 能够更深入地了解材料故障和性能提升.