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Microcracking in Concrete01:20

Microcracking in Concrete

129
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...
129
Mesh Analysis01:20

Mesh Analysis

685
Mesh analysis is a valuable method for simplifying circuit analysis using mesh currents as key circuit variables. Unlike nodal analysis, which focuses on determining unknown voltages, mesh analysis applies Kirchhoff's voltage law (KVL) to find unknown currents within a circuit. This method is particularly convenient in reducing the number of simultaneous equations that need to be solved.
A fundamental concept in mesh analysis is the definition of meshes and mesh currents. A mesh is a closed...
685
Unsymmetric Loading of Thin-Walled Members: Problem Solving01:07

Unsymmetric Loading of Thin-Walled Members: Problem Solving

114
The shear center of a channel section with uniform thickness, height, and width, is determined by computing the shear force in the member and calculating the moments of inertia of the sections.
To compute the shear forces, find the shear flow at a specific distance from the endpoint using the vertical shear and the moment of inertia values. The total shear force on the flange is calculated by integrating the shear flow from one end of the flange to the other.
Next, calculate the moments of...
114
Mechanistic Models: Compartment Models in Algorithms for Numerical Problem Solving01:29

Mechanistic Models: Compartment Models in Algorithms for Numerical Problem Solving

62
Mechanistic models play a crucial role in algorithms for numerical problem-solving, particularly in nonlinear mixed effects modeling (NMEM). These models aim to minimize specific objective functions by evaluating various parameter estimates, leading to the development of systematic algorithms. In some cases, linearization techniques approximate the model using linear equations.
In individual population analyses, different algorithms are employed, such as Cauchy's method, which uses a...
62
Types of Non-structural Cracks in Concrete01:28

Types of Non-structural Cracks in Concrete

168
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.
168
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

274
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.
274

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相关实验视频

Updated: Jul 13, 2025

Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
07:37

Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method

Published on: January 16, 2019

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一个强大的自适应网格生成算法:模拟2D裂生长问题的解决方案.

Abdulnaser M Alshoaibi1, Yahya Ali Fageehi1

  • 1Mechanical Engineering Department, College of Engineering, Jazan University, KSA, 114 Almarefah Rd., Jizan 45142, Saudi Arabia.

Materials (Basel, Switzerland)
|October 14, 2023
PubMed
概括

本研究介绍了一种高效的算法,用于使用自适应性网联来建模二维裂生长. 它准确地预测了复杂的断裂力学问题的裂纹路径和应力强度因子 (SIF).

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:

  • 复杂的2D裂生长模型在网格生成,准确性和计算成本方面提出了挑战.
  • 线性弹性断裂力学 (LEFM) 为分析裂行为提供了一个框架.

研究的目的:

  • 开发一种强大而高效的算法,用于生成高质量的非结构化的三角网格,用于2D裂生长模拟.
  • 在复杂的几何形状中准确预测裂纹路径和应力强度因子 (SIF).

主要方法:

  • 在Visual Fortran中实现自适应性网联算法.
  • 在裂纹尖端附近使用罗塞特元件,以获得准确的SIF近似值.
  • 采用最大周长应力理论来预测裂纹路径.
  • 节点分裂和位移推断用于裂传播和SIF计算.

主要成果:

  • 该算法成功地为复杂的二维裂生长问题生成了高质量的网格.
  • 精确预测压力强度因子 (SIF) 使用罗列元素.
  • 对实验和数值结果进行裂生长路径预测的验证.
  • SIF结果与标准几何学的分析解决方案一致.
关键词:
在SIF中,我们可以看到SIF.适应性网格生成适应性网格生成裂生长成长 裂生长成长有限元素分析的研究.网格的光滑和精细化.

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Last Updated: Jul 13, 2025

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结论:

  • 开发的算法有效地模拟了高精度的二维裂生长.
  • 该方法解决了复杂的断裂机制的网格生成的局限性.
  • 该方法为复杂的裂传播场景提供可靠的应力分析.