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相关概念视频

Yield Criteria for Ductile Materials under Plane Stress01:25

Yield Criteria for Ductile Materials under Plane Stress

194
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...
194
Temperature Dependent Deformation01:12

Temperature Dependent Deformation

174
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...
174
Fatigue01:21

Fatigue

213
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...
213
Stress-Strain Diagram - Ductile Materials01:24

Stress-Strain Diagram - Ductile Materials

873
The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...
873
Shear and Bending Moment Diagram: Problem Solving01:24

Shear and Bending Moment Diagram: Problem Solving

1.6K
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:
Draw a Free-Body Diagram: Start by drawing a free-body diagram of the entire beam, including the concentrated loads, distributed load, and reaction...
1.6K
Thin-Walled Hollow Shafts01:15

Thin-Walled Hollow Shafts

217
In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution...
217

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相关实验视频

Updated: Jul 27, 2025

A Method for Studying the Temperature Dependence of Dynamic Fracture and Fragmentation
09:12

A Method for Studying the Temperature Dependence of Dynamic Fracture and Fragmentation

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热力学循环动力学建模用于导管断裂.

Shankun Liu1, Fei Han1, Xiaoliang Deng2

  • 1State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, International Research Center for Computational Mechanics, Dalian University of Technology, Dalian 116023, China.

Materials (Basel, Switzerland)
|June 10, 2023
PubMed
概括

本研究介绍了一种基于围动力学的模型,用于高温柔性骨折,提高计算效率. 该模型准确地模拟了超合金裂变,与实验数据保持一致,并验证了其有效性.

关键词:
骨折模拟器可以进行骨折模拟.围流动力学是指围流动力学.塑料变形的塑料变形热弹性合器 热弹性合器

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科学领域:

  • 计算力学是计算力学.
  • 材料科学 是一种材料科学.
  • 断裂力学 断裂力学 断裂力学

背景情况:

  • 高温应用对材料完整性提出了挑战,原因是柔性断裂.
  • 精确的模拟柔性断裂对于结构安全和性能至关重要.
  • 现有的计算方法在高温下模拟复杂的断裂现象时可能面临局限性.

研究的目的:

  • 提出一个高效和准确的建模方法,利用周动力学在高温下对柔性骨折进行建模.
  • 开发一个计算框架,将周动力学与经典连续力学相结合,以降低成本.
  • 通过数值模拟和实验比较来验证拟议的模型.

主要方法:

  • 采用了热弹性合模型,结合了周动力学和古典连续力学.
  • 一个塑料构成型的围动力学键的模型被开发,以捕捉柔性骨折.
  • 一个代算法被引入用于柔性断裂计算.
  • 在800°C和900°C的超合金结构上进行了数值模拟.

主要成果:

  • 拟议的模型成功模拟了在高温下超级合金中的柔性断裂过程.
  • 通过将周动力学计算定位到故障区域来降低计算成本.
  • 模拟的裂模式与实验观察结果非常相匹配.
  • 该模型与实验数据有很强的一致性,验证了其预测能力.

结论:

  • 开发的基于围动力学的建模方法对于模拟高温柔性骨折是有效的.
  • 周动力学与连续力学的整合提供了一个有效的方法来进行断裂分析.
  • 该模型复制实验裂纹模式的能力验证了其在工程环境中的适用性.