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相关概念视频

Behavior of Concrete Under Compressive Load01:23

Behavior of Concrete Under Compressive Load

153
Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
As the concrete specimen fractures under...
153
Bending of Members Made of Several Materials01:08

Bending of Members Made of Several Materials

147
In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each...
147
Stresses under Combined Loadings01:23

Stresses under Combined Loadings

148
When analyzing a bent tube with a circular cross-section subjected to multiple forces, it is crucial to determine the stress distribution in order to maintain structural integrity under varied load conditions.
The process begins by slicing the tube at critical points and analyzing the internal forces and stress components at these sections, focusing on the centroid. Normal stresses, generated by axial forces and bending moments, are either compressive or tensile and vary across the section from...
148
Stress-Strain Diagram - Ductile Materials01:24

Stress-Strain Diagram - Ductile Materials

697
The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...
697
Stress: General Loading Conditions01:15

Stress: General Loading Conditions

306
To grasp the intricacy of real-world conditions where multiple loads are applied simultaneously to a structure, one might visualize a section passing through a specific point within a body, aligned parallel to the xy plane. This section is subjected to various forces, including original loads, normal forces, and shearing forces.
The shearing force, possessing potential directionality within the plane of the section, is simplified into two component forces running parallel to the x and y axes....
306
Shearing Stresses in a Beam: Problem Solving01:14

Shearing Stresses in a Beam: Problem Solving

177
A cantilever beam with a rectangular cross-section under distributed and point loads experiences shearing stresses. The analysis begins by identifying the loads acting on the beam. Then, the reactions at the beam's fixed end are calculated using equilibrium equations. The vertical reaction is a combination of the distributed and point loads, while the moment reaction is the sum of their moments. The shear force distribution along the beam, resulting from these loads, is established by...
177

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Cutting Procedures, Tensile Testing, and Ageing of Flexible Unidirectional Composite Laminates
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对于承受压缩负荷的复合钢丝管的多尺度渐进式故障分析.

Jian Shi1, Jianjiang Zeng2, Jie Zheng3

  • 1College of Aviation Engineering, Civil Aviation Flight University of China, Guanghan 618307, China.

Materials (Basel, Switzerland)
|July 13, 2024
PubMed
概括
此摘要是机器生成的。

本研究使用多尺度模型量化预测复合飞机结构中的矩阵损伤. 该方法准确模拟故障模式和负载,有助于设计更有弹性复合材料.

关键词:
这是GMC GMC GMC.斯特林格尔的复合材料.发生矩阵损伤.多个尺度分析分析.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 机械工程 机械工程
  • 航空航天工程 航空航天工程

背景情况:

  • 纤维增强复合纤维在飞机机翼中至关重要.
  • 矩阵裂纹是压缩下常见的故障模式.
  • 对矩阵失效的定量分析具有挑战性.

研究的目的:

  • 开发和验证一种多尺度的方法,用于预测复合纤维的矩阵损伤.
  • 通过使用一种新的损害指标,量化评估矩阵故障程度.
  • 将模拟结果与实验数据进行比较.

主要方法:

  • 一种结合通用细胞方法 (GMC) 和有限元素方法 (FEM) 的多尺度方法.
  • 适用于矩阵子细胞的3D Tsai-Hill标准和纤维子细胞的最大应力标准.
  • 模拟失败子细胞的刚性降低,以表示损伤进展.

主要成果:

  • 多尺度模型准确地预测了最终负载,故障模式和负载位移曲线.
  • 实验和模拟结果显示了良好的一致性.
  • 失败的矩阵子细胞的数量有效量化了2x2GMC模型中的损伤程度.

结论:

  • 拟议的多尺度分析方法成功地预测了复合纤维的矩阵损伤.
  • 主要在45°和-45°层中观察到矩阵亚细胞故障.
  • 这种方法为分析压力负荷下的复合材料结构完整性提供了可靠的工具.