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相关概念视频

Residual Stresses in Bending01:18

Residual Stresses in Bending

152
In the study of elastoplastic members subjected to bending moments, understanding the loading and unloading phases is crucial for assessing material behavior and structural integrity. During the loading phase, as the bending moment increases, the material initially responds elastically, adhering to Hooke's Law, where stress is directly proportional to strain. When the load exceeds the yield strength, plastic deformation occurs, resulting in permanent strain and deformation that remains even...
152
Residual Stresses01:26

Residual Stresses

207
Residual stresses reside in a structure even after removing the original stress inducer. This phenomenon often arises from varied plastic deformations across different parts of a structure. Consider a rod stretched beyond its yield point. It will not regain its original length due to permanent deformation. Even after load removal, the rod does not entirely lose stress because of uneven plastic deformations, resulting in residual stresses. The computation of these stresses in structures is...
207
Plastic Behavior01:21

Plastic Behavior

189
A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
189
Plastic Deformations01:14

Plastic Deformations

82
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...
82
Stress-Strain Diagram - Ductile Materials01:24

Stress-Strain Diagram - Ductile Materials

628
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...
628
Residual Stresses in Circular Shafts01:10

Residual Stresses in Circular Shafts

161
In materials that exhibit elastic and plastic behavior, known as elastoplastic materials, residual stresses can accumulate when these materials experience plastic deformation. This deformation arises from either high levels of shearing stress or significant strains. Residual stresses are internal stresses that persist within a material after removing the external force causing deformation. This phenomenon is demonstrated when observing the behavior of a shaft under torque; notably, the...
161

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在快速正面固化聚合物中,残留菌株的发展.

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  • 1Mechanical Engineering Department, University of Wyoming, Laramie, Wyoming 82071, United States.

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前端聚合 (FP) 使用外热反应快速固化热. 这项研究模拟了材料演变和残留变形,建议预热以减轻FP制造中的应变.

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科学领域:

  • 聚合物科学 聚合物科学
  • 材料工程 材料工程 材料工程
  • 化学工程是化学工程的重要组成部分.

背景情况:

  • 前端聚合 (FP) 可快速,节能地制造热和复合材料.
  • 商业应用需要更好地预测FP期间的材料演变和残余变形.
  • 了解依赖治疗的特性对于设计FP过程至关重要.

研究的目的:

  • 在前端聚合过程中实验性地描述和数值模型材料进化.
  • 为了捕获和预测FP过程中产生的残留菌株.
  • 确定用于减轻FP制造中的残余变形的策略.

主要方法:

  • 实验测量二cyclopentadiene的温度和治疗依赖性质 (弹性模块,Poisson的比率,CTE,化学收缩).
  • 基于实验数据的结合热化学机械模型的开发.
  • 数字模拟以捕捉菌株演变和残留菌株.

主要成果:

  • 材料的性能 (弹性模块,波桑比率,CTE,化学收缩) 非常依赖于固化的程度.
  • 一个合模型准确地捕获实验测量的残留菌株.
  • 与固化速率相关的化学收缩导致应变局部化,特别是在反应前线合并的地方.
  • 在合并的前面区域预热单体/凝有效减少剩余变形.

结论:

  • 开发的热化学机械模型准确地预测了前部聚合过程中的残余应变.
  • 化学收缩是局部残留菌株的主要驱动因素.
  • 合并前面区域的预热是一种可行的策略,以最大限度地减少FP应用中的残留变形.