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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

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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...
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First Law: Particles in One-dimensional Equilibrium01:10

First Law: Particles in One-dimensional Equilibrium

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Newton's first law of motion states that a body at rest remains at rest, or if in motion, remains in motion at constant velocity, unless acted on by a net external force. It also states that there must be a cause for any change in velocity (a change in either magnitude or direction) to occur. This cause is a net external force. For example, consider what happens to an object sliding along a rough horizontal surface. The object quickly grinds to a halt, due to the net force of friction. If...
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First Law: Particles in Two-dimensional Equilibrium01:18

First Law: Particles in Two-dimensional Equilibrium

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Recall that a particle in equilibrium is one for which the external forces are balanced. Static equilibrium involves objects at rest, and dynamic equilibrium involves objects in motion without acceleration; but it is important to remember that these conditions are relative. For instance, an object may be at rest when viewed from one frame of reference, but that same object would appear to be in motion when viewed by someone moving at a constant velocity.
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Reaction Yield02:22

Reaction Yield

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The theoretical yield of a reaction is the amount of product estimated to form based on the stoichiometry of the balanced chemical equation. The theoretical yield assumes the complete conversion of the limiting reactant into the desired product. The amount of product that is obtained by performing the reaction is called the actual yield, and it may be less than or (very rarely) equal to the theoretical yield.
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Plastic Behavior01:21

Plastic Behavior

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A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
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Sieve Analysis and Grading Curves01:19

Sieve Analysis and Grading Curves

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Sieve analysis is a method used to determine the particle size distribution of aggregate materials. This process involves the following steps:
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Visualization of Failure and the Associated Grain-Scale Mechanical Behavior of Granular Soils under Shear using Synchrotron X-Ray Micro-Tomography
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对颗粒物质的动态产量标准从第一原则出发.

O Coquand1,2, M Sperl1,3

  • 1Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), 51170 Köln, Germany.

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概括
此摘要是机器生成的。

这项研究揭示了如何在密集的颗粒流中出现收益应力,使用液态理论. 这些发现提供了一个新的动态产量表面方程,可以弥合软和硬材料的行为.

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科学领域:

  • 类风病学 类风病学 类风病学
  • 颗粒力学 颗粒力学
  • 流动状态理论 流动状态理论

背景情况:

  • 了解颗粒物质的产生过渡对于预测材料的行为至关重要.
  • 现有的固体断裂模型不能完全捕捉颗粒流的复杂性.

研究的目的:

  • 为了研究在密集的颗粒流中产量压力的出现.
  • 开发和分析一个动态收益率表面的颗粒状物质.

主要方法:

  • 利用最近开发的基于液态理论的模型.
  • 导出动态收益率表面的分析方程.

主要成果:

  • 该模型预测了一个动态产率表面,该表面在软和硬材料故障行为之间进行插曲.
  • 有效摩擦系数在产率过渡中起着核心作用.

结论:

  • 开发的模型提供了一种新的方法来理解颗粒性产量.
  • 这些发现提供了关于密集颗粒流和材料故障的风学的见解.