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相关概念视频

Deformation of a Beam under Transverse Loading01:15

Deformation of a Beam under Transverse Loading

922
Understanding beam deflection, particularly for indeterminate beams with overhanging segments and multiple concentrated loads, is crucial for ensuring structural integrity and functionality. The process begins with constructing an accurate free-body diagram, which helps identify the forces and moments acting on the beam. This diagram is vital for visualizing how bending moments vary along the beam's length, influencing its curvature.
The insights from the bending moment diagram extend to...
922
Beams with Symmetric Loadings01:15

Beams with Symmetric Loadings

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The moment-area method is an analytical tool used in structural engineering to determine the slope and deflection of beams under various loads. Consider a cantilever with a concentrated load and moment at the free end. The first step is constructing a free-body diagram to calculate the reactions at the fixed end. Next, the bending moment diagram is plotted to visualize how the bending moment varies along the beam's length, focusing on points where the bending moment equals zero.
The M/EI...
503
Beams with Unsymmetric Loadings01:17

Beams with Unsymmetric Loadings

504
Analyzing a supported beam under unsymmetrical loadings is essential in structural engineering to understand how beams respond to varied force distributions. This analysis involves calculating the deflection and identifying points where the slope of the beam is zero, which are crucial for ensuring structural stability and functionality.
The first moment-area theorem determines the slope at any point on the beam. This theorem indicates that the change in slope between two points on a beam...
504
Microcracking in Concrete01:20

Microcracking in Concrete

575
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...
575
Dynamic Modulus of Elasticity of Concrete01:16

Dynamic Modulus of Elasticity of Concrete

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The dynamic modulus of elasticity assesses how a concrete structure deforms under impact or dynamic loads. It is typically higher than the static modulus of elasticity, measured under slow, steady loading conditions.
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by a...
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Types of Non-structural Cracks in Concrete01:28

Types of Non-structural Cracks in Concrete

609
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.
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相关实验视频

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使用FEM-DEM桥接合器进行裂纹传播的双尺度并发模拟.

Manon Voisin-Leprince1, Joaquin Garcia-Suarez1, Guillaume Anciaux1

  • 1Institute of Civil Engineering, Institute of Materials Science and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland.

Computational particle mechanics
|October 3, 2024
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概括

这项研究验证了一种结合的有限元素方法 (FEM) 和离散元素方法 (DEM) 方法来模拟材料故障. FEM-DEM合精确地模拟了颗粒材料的裂传播和磨损,从而降低了大型领域的计算成本.

关键词:
桥接合器的桥接合器裂纹的传播裂纹的传播.离散元件方法的离散元素方法.有限元素方法 有限元素方法.有颗粒的颗粒状颗粒.多层次的多层次的

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科学领域:

  • 计算力学是计算力学.
  • 材料科学是一种材料科学.
  • 数字建模 数字建模

背景情况:

  • 离散元件方法 (DEM) 对于颗粒物材料模拟是有效的,但对于大型领域而言,计算成本昂贵.
  • 有限元法 (FEM) 对于小变形是有效的,但不太适合复杂的颗粒行为.
  • 合DEM和FEM提供了一个潜在的解决方案,以平衡精度和计算效率.

研究的目的:

  • 为了评估强大的FEM-DEM合配方用于模拟材料故障事件的准确性.
  • 评估DEM域大小对合方法准确性的影响.
  • 为了验证FEM-DEM合与纯的DEM模拟对裂传播和磨损的验证.

主要方法:

  • 实施了一种强合配方,将DEM粒子与FEM节点互插连接在重叠区域.
  • 对I模式裂传播和导致碎片的粗表面剪切进行了模拟.
  • 通过改变 DEM 域的大小并将结果与纯 DEM 模拟进行比较来评估合方法的准确性.

主要成果:

  • 该FEM-DEM合器准确地捕获材料故障,包括裂传播和碎片的产生.
  • 结合方法的准确性保持不论DEM域大小相对于故障区域.
  • 与纯粹的DEM相比,大规模模拟的计算效率得到了显著提高.

结论:

  • 强大的FEM-DEM合是模拟颗粒材料材料故障的有效和准确方法.
  • 这种混合方法为大规模的工程问题提供了一个计算效率高的替代品,而不是纯粹的DEM.
  • 经过验证的合方法可可靠地应用于涉及骨折和磨损的复杂场景.