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相关概念视频

Microcracking in Concrete01:20

Microcracking in Concrete

103
Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
103
Effects of Creep01:25

Effects of Creep

99
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,...
99
Fatigue01:21

Fatigue

174
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...
174
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

251
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.
251
Euler's Formula to Columns with Other End Conditions01:15

Euler's Formula to Columns with Other End Conditions

467
Euler's formula is very important in the field of structural engineering, providing a foundation for understanding the critical loading conditions of pin-ended columns. This formula links the modulus of elasticity, the moment of inertia of the cross-section, and the column's length, offering a precise calculation of the critical load at which a column is prone to buckling.
467
Types of Non-structural Cracks in Concrete01:28

Types of Non-structural Cracks in Concrete

130
Non-structural cracks are primarily of three types: plastic, early-age thermal, and drying shrinkage cracks. Plastic cracks are further classified into plastic shrinkage cracks and plastic settlement cracks.
Plastic shrinkage cracks typically form within hours after the concrete is poured. The concrete's surface dries faster than the bottom, creating tensile stress that the still-plastic concrete cannot withstand, leading to diagonal or randomly patterned cracks on the concrete surface.
130

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相关实验视频

Updated: Jun 8, 2025

Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
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使用扩展的有限元素方法来解决裂演变的改进.

Yuxiao Wang1, Akbar A Javadi2, Corrado Fidelibus3

  • 1Department of Engineering, University of Exeter, Harrison Building, North Park Road, Exeter, EX4 4QF, United Kingdom.

Scientific reports
|November 6, 2024
PubMed
概括

扩展有限元法 (XFEM) 有效地模拟了裂的生长. 这项研究通过优化元素细分和高斯点分布来提高XFEM的准确性和效率,用于裂分析.

关键词:
扩展的有限元素方法, 裂演化, 对称节点, 对相互作用积分方法的精度改进.

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Finite Element Modeling for the Simulation of the Quasi-Static Compression of Corrugated Tapered Tubes
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科学领域:

  • 计算力学 计算力学 计算力学
  • 材料科学 材料科学 材料科学
  • 断裂力学 断裂力学 断裂力学

背景情况:

  • 扩展有限元法 (XFEM) 是一个强大的工具,可以模拟裂演变而无需网状精细化.
  • 然而,XFEM中的近似可以导致节点位移的不准确,特别是在裂纹尖端附近.
  • 提高XFEM的计算效率和准确性仍然是一个活跃的研究领域.

研究的目的:

  • 在数学上研究和提高 eXtended Finite Element Method (XFEM) 的解决方案效率.
  • 为了确定XFEM模拟中节点位移差异的原因.
  • 建议和验证使用XFEM进行准确和高效的裂分析的改进.

主要方法:

  • 对XFEM解决过程进行全面的数学分析,重点关注全球刚度矩阵.
  • 开发了两种新的改进策略:基于高斯点分布和最佳高斯点确定的元素细分.
  • 建议改进的应用与压力强度因子计算的相互作用积分方法.
  • 对分析和标准XFEM解决方案进行数值验证.

主要成果:

  • 结节位移的不一致性被确定并归因于XFEM近似.
  • 提出的元素细分和最佳高斯点分配的方法显著提高了准确性.
  • 增强的XFEM方法,结合交互积分方法,减少了计算时间,并消除了表面引的影响.
  • 与标准XFEM相比,经验证的数值结果显示了更高的准确性和效率.

结论:

  • 提议的改进有效地解决了XFEM在裂模拟中的精度限制.
  • 优化元素细分和高斯点策略可以提高计算效率和解决方案精度.
  • 精细的XFEM方法为破裂力学分析提供了更可靠,更快的方法.