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相关概念视频

Fatigue01:21

Fatigue

185
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...
185
Dynamic Modulus of Elasticity of Concrete01:16

Dynamic Modulus of Elasticity of Concrete

348
The dynamic modulus of elasticity assesses how a concrete structure deforms under impact or dynamic loads. It is typically higher than the static modulus of elasticity, measured under slow, steady loading conditions.
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by...
348

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相关实验视频

Updated: Jul 6, 2025

Intermediate Strain Rate Material Characterization with Digital Image Correlation
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在极其复杂的工作条件下对鼓动力学可靠性的实验和数值评估.

Guochao Zhao1, Xin Jin2, Lijuan Zhao1

  • 1School of Mechanical Engineering, Liaoning Technical University, Fuxin, 123000, China.

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|January 5, 2024
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概括

这项研究优化了煤矿鼓的参数,以提高可靠性. 关键发现揭示了引和旋转速度如何影响鼓负载,应力和磨损,为提高操作效率和安全提供了洞察力.

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相关实验视频

Last Updated: Jul 6, 2025

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科学领域:

  • 机械工程 机械工程
  • 采矿工程 采矿工程 采矿工程
  • 材料科学 材料科学 材料科学

背景情况:

  • 在复杂的操作环境中,采煤机桶面临重大损坏和故障,影响煤炭生产的效率和安全性.
  • 了解负载下的鼓动力学对于防止故障和在苛刻的采矿条件下优化性能至关重要.

研究的目的:

  • 通过分析负载,应力和磨损来研究煤矿机床鼓的动态可靠性.
  • 建立一个基于操作参数的鼓负载的数学模型.
  • 确定最佳的工作参数,以提高鼓的耐磨性.

主要方法:

  • 使用虚拟模拟和物理实验开发和验证用于鼓煤岩切割相互作用的有限元模型.
  • 通过负载,应力和磨损模拟来分析鼓动力学可靠性.
  • 建立一个数学模型,将鼓负载与引和鼓旋转速度联系起来.
  • 应用直角测试来推导耐磨性能的最佳参数.

主要成果:

  • 鼓载荷随着引速度增加而增加,随着鼓旋转速度减少.
  • 增加的引速度 (26 m/min) 会导致体应力显著增加 (平均27.394%).
  • 在90r/min鼓旋转速度,3m/min引速度和弹子加载模式下观察到最佳耐磨性,最大限度地降低了和螺旋叶片的磨损深度.

结论:

  • 该研究提供了一种经过验证的方法,用于在运行负载下评估鼓的可靠性.
  • 确定了最佳参数组合,为选择鼓工作参数提供了实际指导,以提高耐用性和效率.
  • 这些发现有助于提高煤矿机械的寿命和性能.