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相关概念视频

Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

190
When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
190
Deformation in a Circular Shaft01:10

Deformation in a Circular Shaft

289
One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
289
Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

166
When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
166
Deformations in a Symmetric Member in Bending01:18

Deformations in a Symmetric Member in Bending

167
When analyzing the deformation of a symmetric prismatic member subjected to bending by equal and opposite couples, it becomes clear that as the member bends, the originally straight lines on its wider faces curve into circular arcs, with a constant radius centered at a point known as Point C. This phenomenon helps to understand the stress and strain distribution within the member more clearly.
When the member is segmented into tiny cubic elements, it is observed that the primary stress...
167
Deformations in a Transverse Cross Section01:21

Deformations in a Transverse Cross Section

192
When a material is subjected to uniaxial stress, it elongates or contracts in the direction of the applied force, and also undergoes changes in the perpendicular directions. This behavior is crucial for understanding how materials behave under stress and is governed by mechanical properties such as Poisson's ratio v, which measures the ratio of transverse strain to axial strain.
As the material stretches, it expands or contracts in orthogonal directions to the load. This phenomenon varies...
192
Deformation of a Beam under Transverse Loading01:15

Deformation of a Beam under Transverse Loading

295
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...
295

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相关实验视频

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Designing CAD/CAM Surgical Guides for Maxillary Reconstruction Using an In-house Approach
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在HP MJF 3D打印过程中最大限度地减少变形.

Karel Ráž1, Zdeněk Chval1, Sacha Thomann2

  • 1Faculty of Mechanical Engineering, Regional Technological Institute, University of West Bohemia, Univerzitni 8, 306 14 Plzen, Czech Republic.

Materials (Basel, Switzerland)
|December 9, 2023
PubMed
概括

这项研究调查了惠特 - 帕卡德多喷气融合 (HP MJF) 3D打印,该研究发现零件位置显著影响变形. 模拟显示了预测和最小化尼龙塑料零件中这些关键扭曲的潜力.

关键词:
通过3D打印打印3D打印.数字化的数字化.在MJF中,MJF是MJF.在PA12GBGB中使用.添加剂制造 添加剂制造 添加剂制造变形变形的情况

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科学领域:

  • 材料科学 材料科学 材料科学
  • 制造业 工程 制造工程
  • 计算工程 计算工程

背景情况:

  • 增材制造 (AM),特别是惠特 - 帕卡德多喷气融合 (HP MJF),是一种快速发展的技术,具有广泛的应用.
  • 3D打印零件的变形是一个重大挑战,它会影响最终产品的性能,并需要缓解策略.

研究的目的:

  • 在HP MJF 3D打印过程中调查和理解变形机制.
  • 探索减少零件变形和提高3D打印元件质量的方法.

主要方法:

  • 用玻璃珠注入尼龙塑料 (PA12GB) 制成的零件使用HP MJF技术打印.
  • 随着时间的推移,通过在不同点测量标本来追踪变形.
  • 使用Digimat软件 (AM,MF,FE,CAE模块) 进行了有限元模拟,并与实验结果进行了比较.

主要成果:

  • 在HP MJF打印机中的部件打印位置显然会影响变形水平.
  • 模拟表明,与单个部件相比,将多个部件打印在一起可以减少预测的变形 (5.7毫米对比7.19毫米).
  • 在模拟 (3.44毫米 - 7.19毫米) 和现实世界变形 (3.44毫米) 之间存在显著差异,突出了变形预测的复杂性.

结论:

  • 了解变形机制对于提高3D打印零件质量至关重要.
  • 该研究提供了对影响变形的因素的见解,并探索了减少的技术.
  • 这些发现可以指导对补偿技术的开发,以尽量减少HP MJF零件的扭曲.