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相关概念视频

Plastic Behavior01:21

Plastic Behavior

224
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...
224
Members Made of Elastoplastic Material01:19

Members Made of Elastoplastic Material

121
The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
As the bending moment...
121
Temperature Dependent Deformation01:12

Temperature Dependent Deformation

171
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
171
Plastic Deformations01:14

Plastic Deformations

110
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...
110
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

294
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.
294

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使用工艺和有限元模拟研究PBAT聚合物的辅助结构变形行为.

Yanling Schneider1, Vinzenz Guski1, Ahmet O Sahin1

  • 1Institute for Materials Testing, Materials Science and Strength of Materials (IMWF), University of Stuttgart, Pfaffenwaldring 32, D-70569 Stuttgart, Germany.

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概括

这项研究探讨了可生物降解的逆蜂结构的辅助性行为,揭示了3D打印产生的残余应力如何影响它们的变形. 有限元模拟准确地预测了这种应力及其对机械性能的影响.

关键词:
基于FE的过程模拟过程.辅助性行为 辅助性行为可生物降解,可生物降解.计算机断层扫描 (CT) 是一种计算机断层扫描.剩余压力分布的剩余压力分布战争页面 战争页面

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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
  • 增材制造 增材制造 增材制造

背景情况:

  • 增材制造工艺,如沉积建模 (FDM),在可生物降解的聚合物结构中引入残余应力 (RS) 和扭曲.
  • 反向蜂结构表现出辅助性质,但它们的行为可能受到制造引起的缺陷的影响.
  • 在精细,复杂的结构中测量RS在实验上具有挑战性.

研究的目的:

  • 为了研究5x5细胞逆蜂结构的辅助性拉伸变形行为,这些结构由可生物降解的聚乙烯基酸盐-甲酸盐 (PBAT) 制成.
  • 以数值预测和分析残余应力 (RS) 对这些结构的辅热变形的影响.
  • 为了将模拟预测与对曲面和变形行为的实验结果进行比较.

主要方法:

  • 利用化沉积模型 (FDM) 来制造PBAT反向蜂标本.
  • 采用基于有限元素 (FE) 的过程模拟 (ABAQUS插件) 来预测RS和曲面.
  • 将预测的RS作为初始条件集成到FE模型中,以模拟辅助性拉伸行为.

主要成果:

  • FE过程模拟准确地预测了与设计相对微不足道的偏差的曲面.
  • FE模拟揭示了制造过程中温度演变和循环加热/冷却的影响.
  • 分析显示,与非RS模拟相比,RS对力位移曲线,Poisson比率演变和应力分布有显著的影响.

结论:

  • 基于FE的过程模拟是一种可行的方法,用于预测增材制造的辅助性结构中的RS和曲面.
  • 其余应力显著改变PBAT逆蜂结构的辅助变形行为.
  • 该研究提供了通过增材制造制造的可生物降解辅助性材料的机械性能.