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相关概念视频

Bending of Members Made of Several Materials01:08

Bending of Members Made of Several Materials

138
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...
138
Plastic Deformations01:14

Plastic Deformations

81
It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
81
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

246
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.
246
Plastic Deformations of Members with a Single Plane of Symmetry01:21

Plastic Deformations of Members with a Single Plane of Symmetry

86
When a structural member undergoes plastic deformation due to bending, it is crucial to understand the position of the neutral axis and the stress distribution. This member, characterized by a single plane of symmetry, exhibits a uniform stress distribution, with negative stress above the neutral axis and positive stress below. Notably, the neutral axis does not align with the centroid of the cross-section. This misalignment is typical in cases where the cross-section is not rectangular or...
86
Mechanistic Models: Compartment Models in Algorithms for Numerical Problem Solving01:29

Mechanistic Models: Compartment Models in Algorithms for Numerical Problem Solving

38
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...
38
Design of Prismatic Beams for Bending01:23

Design of Prismatic Beams for Bending

204
The design of prismatic beams, structural elements with a uniform cross-section, focuses on ensuring safety and structural integrity under load. The design process begins by determining the allowable stress, either from material properties tables, or by dividing the material's ultimate strength by a safety factor. This safety factor is essential for accommodating uncertainties, and varies depending on the material—timber, steel, or concrete—with each having unique strength and...
204

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相关实验视频

Updated: May 31, 2025

Structural Design and Manufacturing of a Cruiser Class Solar Vehicle
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复合层材的优化,以处理诱导的变形和曲自身价值,基于改进的遗传算法.

Qingchuan Liu1, Xiaodong Wang1, Zhidong Guan1

  • 1School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China.

Materials (Basel, Switzerland)
|January 25, 2025
PubMed
概括

这项研究优化了复合板材结构,以减少制造缺陷,如弹角度,并提高抗性. 一个改进的自适应基因算法 (IAGA) 显著提高了结构性能和可制造性.

关键词:
有限元分析是有限元分析.遗传算法是一种遗传算法.过程模拟的过程模拟.在加工过程中引起的变形.

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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
  • 计算力学 计算力学 计算力学

背景情况:

  • 复合层板和硬化板由于不同层面方向而表现出热残余应力和加工诱导的变形 (PID).
  • 刚性面板中的几何特征和层方向不匹配加剧了PID,影响了结构完整性.
  • 缓解这些问题对于提高复合结构的性能和可制造性至关重要.

研究的目的:

  • 通过使用改进的自适应基因算法 (IAGA) 提出和验证一个多目标堆叠优化策略.
  • 为了最大限度地减少加工诱导的变形 (PID),特别是弹入角,在复合层结构的L形硬化剂中.
  • 为了提高复合材料硬化板的结构性能,特别是抗性.

主要方法:

  • 采用粘弹性构成模型来准确模拟硬化过程中的模量变化.
  • 开发并应用了一种改进的自适应基因算法 (IAGA),用于多目标优化叠加序列.
  • 优化了复合板结构中L形硬化剂的层叠序列.

主要成果:

  • 实现了弹入角的显著降低至0.12°,比对称平衡设计提高了50%.
  • 通过优化堆叠序列,增强了20%的曲折固有值.
  • 证明了IAGA对NSGA的优势,帕雷托解决方案多样性增加了三倍,并减少了70%的融合时间.

结论:

  • 不对称的层设计有效地减轻复合硬化板中的残余应力和PID.
  • 拟议的IAGA为优化复合板结构提供了一个强大而高效的框架.
  • 这些发现有助于提高先进复合材料的结构性能和可制造性.