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相关概念视频

Plasticity00:58

Plasticity

2.1K
Plasticity is the property where an object loses its elasticity and undergoes irreversible deformation, even after the deformation forces are eliminated. If a material deforms irreversibly without increasing stress or load, then this is called ideal plasticity. For example, when a force is applied to an aluminum rod, it changes its shape, but it does not return to its original shape once the force is removed. Plastic deformation or ductility is thus a permanent deformation or change in the...
2.1K
Plastic Behavior01:21

Plastic Behavior

175
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...
175
Porosity in Cement Paste01:18

Porosity in Cement Paste

95
The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
The balance of water to cement in the mix is...
95
Plastic Deformations01:19

Plastic Deformations

97
Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
97
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

221
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
221
Members Made of Elastoplastic Material01:19

Members Made of Elastoplastic Material

92
The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
As the bending moment...
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A Coupled Experiment-finite Element Modeling Methodology for Assessing High Strain Rate Mechanical Response of Soft Biomaterials
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一个高效的损伤-可塑性DEM接触模型,用于高度多孔的岩石.

Jinhui Zheng1, Matteo Oryem Ciantia1,2

  • 1School of Science and Engineering, University of Dundee, Dundee, UK.

Rock mechanics and rock engineering
|May 5, 2025
PubMed
概括
此摘要是机器生成的。

一个新的离散元件方法 (DEM) 模型准确地模拟了多孔软岩的行为,这对于堆透研究至关重要. 这种高效且可扩展的模型捕捉了微观损伤和宏观反应,例如石.

关键词:
石是什么意思 石是什么意思离散元件建模的模型.软岩石是一种柔软的岩石.土壤与结构的相互作用.

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科学领域:

  • 计算地质力学计算地质力学
  • 材料科学 是一种材料科学.
  • 数字建模 数字建模

背景情况:

  • 精确模拟多孔软岩的行为对于地质工程至关重要,特别是在堆穿透问题上.
  • 现有的模型往往难以捕捉这些材料宏观反应的复杂微观机制.
  • 对于模拟大规模地质技术场景而言,需要有效和可扩展的数值方法至关重要.

研究的目的:

  • 开发和验证一种新的离散元素方法 (DEM) 模型,用于模拟多孔软岩的行为.
  • 为了增强现实主义,将微尺度损伤和塑料变形纳入宏观元素框架中.
  • 评估模型的效率,可扩展性和对堆透场景的预测能力.

主要方法:

  • 开发了一种新的离散元素方法 (DEM) 模型,利用宏观元素理论和微尺度塑料变形损伤定律.
  • 采用远场相互作用框架来处理高孔径,不规则的颗粒和键片段,允许不重叠的粒子传递力.
  • 使用结合的DEM-Finite差分方法 (FDM) 框架来提高3D数值模拟的效率.

主要成果:

  • 该模型经过校准并成功复制了马斯特里赫特石的行为,在临界状态理论框架内探索了它的机械反应.
  • 对圆末端透测试的模拟显示实验和数值结果之间很好地匹配,验证了该模型的预测能力.
  • 结合的DEM-FDM方法在3D模拟中显示出显著的效率提升.

结论:

  • 提出的DEM模型有效地复制了多孔软岩的行为,包括复杂的微观尺度现象.
  • 该模型的效率和可扩展性使其适合模拟大规模的地质技术问题,如穿透.
  • 这种新的方法为控制软岩/结构相互作用中的宏观反应的微观机制提供了洞察力.