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Thermal expansion and Thermal stress: Problem Solving01:27

Thermal expansion and Thermal stress: Problem Solving

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San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in...
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Factors Affecting Creep01:28

Factors Affecting Creep

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In normal-weight aggregate concrete, the hardened cement paste is the primary contributor to creep, whereas the aggregates, being stiffer than the cement paste, are more resilient to stress-induced deformation. The stiffness of the aggregates is defined by their modulus of elasticity, and the more voluminous they are in the concrete, the less it will creep.
Further, the water/cement ratio is critical, as a lower ratio increases concrete strength, thus reducing creep. The strength of the...
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Effects of Creep01:25

Effects of Creep

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Creep in concrete, the gradual deformation under prolonged stress, significantly impacts the integrity of structures. For reinforced concrete beams, it can be a vital design consideration, as it increases deflection, sometimes necessitating additional design measures. In columns, especially slender ones under eccentric loads, creep can cause buckling, compromising their stability. However, creep can be beneficial in indeterminate structures by mitigating stresses that arise from shrinkage,...
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Thermal Stress01:09

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If the temperature of an object is changed while it is prevented from expanding or contracting, the object is subjected to stress. The stress is compressive if the object expands in the absence of constraint and tensile if it contracts. This stress resulting from temperature change is known as thermal stress. It can be quite large and can cause damage. To avoid this stress, engineers may design components so they can expand and contract freely. For instance, on highways, gaps are deliberately...
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Le Chatelier's Principle: Changing Temperature02:19

Le Chatelier's Principle: Changing Temperature

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Consistent with the law of mass action, an equilibrium stressed by a change in concentration will shift to re-establish equilibrium without any change in the value of the equilibrium constant, K. When an equilibrium shifts in response to a temperature change, however, it is re-established with a different relative composition that exhibits a different value for the equilibrium constant.
To understand this phenomenon, consider the elementary reaction:
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Le Chatelier's Principle: Changing Volume (Pressure)02:32

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For gas-phase equilibria, changes in the concentrations of reactants and products can occur with altered volume and pressure. The partial pressure, P, of an ideal gas is proportional to its molar concentration, M.
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Updated: Jun 3, 2025

Conducting Elevated Temperature Normal and Combined Pressure-Shear Plate Impact Experiments Via a Breech-end Sabot Heater System
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在Li/LLZO接口上的空洞演变:堆压力和运行温度驱动的爬行效应.

Ke Li1, Jundi Huang1, Xinyi Qu1

  • 1School of Energy and Power Engineering, Huazhong University of Science & Technology, Wuhan, Hubei 430074, China.

ACS applied materials & interfaces
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PubMed
概括
此摘要是机器生成的。

堆压力和温度通过促进金属爬行来增强固态电池的稳定性,从而治愈接口空隙. 这项研究提供了一个模型,以优化空隙愈合条件和提高电池性能.

关键词:
爬行的人 爬行的人金属阳极是一种金属阳极.操作温度 工作温度固态电解质 固态电解质堆叠压力压力堆的压力虚空进化过程中的真空进化

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相关实验视频

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科学领域:

  • 材料科学 材料科学 材料科学
  • 电化学 电化学 电化学
  • 固态电池 固态电池是什么

背景情况:

  • 全固态金属电池提供高能量密度和安全性,但在循环过程中会出现接口空隙.
  • 在金属阳极/固态电解质接口形成的空隙降低了接触和循环稳定性.
  • 了解堆压力和温度在通过爬行对空洞演变的作用对于接口稳定性至关重要.

研究的目的:

  • 在金属阳极/固态电解质接口上开发空隙演变模型.
  • 为了研究堆压力和工作温度对通过爬行变形的空隙愈合的影响.
  • 为优化压力和温度建立理论基础,以确保接口稳定性.

主要方法:

  • 开发了一种空洞演化 (EDMP-VE) 模型的电化学-扩散-机械 (爬行) 相场.
  • 模拟了的剥离/沉积,扩散,爬行,格子扭曲和空缺动力学.
  • 利用规范化的几何参数和应力/应变演变来描述空洞动力学.

主要成果:

  • EDMP-VE模型准确地捕捉了剥离和化周期期间的空洞演变.
  • 高堆压力和工作温度促进金属的爬行,抑制空隙膨胀和加速空隙填充.
  • 一个相位图确定了空隙愈合和接口稳定性的最佳压力-温度窗口.

结论:

  • 堆压力和工作温度驱动的爬行显著影响固态电池中的空隙演变和接口完整性.
  • 优化这些参数可以导致空虚消灭和改善接口接触.
  • 本研究提供了一个理论框架和实际指导,以提高固态电池的循环寿命.