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相关概念视频

Bending of Curved Members - Strain Analysis01:14

Bending of Curved Members - Strain Analysis

502
The mechanics of deformation in curved members, such as beams or arches, under bending moments, involve complex responses. When such a member, symmetric about the y-axis and shaped like a segment of a circle centered at point C, is subjected to equal and opposite forces, its curvature and surface lengths change significantly. This alteration results in the shift of the curvature's center from C to C', indicating a tighter curve.
The important part of bending analysis for such a member...
502
Drying Shrinkage01:21

Drying Shrinkage

363
When hardened concrete is exposed to air with a relative humidity of less than 100 percent, it begins to lose the free water within its capillaries. As this water evaporates, the water initially adsorbed onto the calcium silicate hydrates migrates towards these now empty spaces and eventually evaporates as well. Over time, as more water leaves, the volume of the concrete decreases, a phenomenon known as drying shrinkage.
A portion of this drying shrinkage can be reversed; if the concrete is...
363
Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

447
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...
447
Carbonation Shrinkage01:24

Carbonation Shrinkage

449
Atmospheric CO2 penetrates the concrete's pores and, in the presence of moisture, forms carbonic acid, which then reacts with calcium hydroxide in the hydrated cement, forming calcium carbonate. This process reduces the concrete's volume and is termed carbonation shrinkage.
The concrete's permeability is slightly reduced as calcium carbonate produced during the reaction fills its pores. Furthermore, its strength is slightly enhanced as the water released during the reaction...
449
Plastic Behavior01:21

Plastic Behavior

527
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...
527
Shrinkage in Concrete01:27

Shrinkage in Concrete

374
Shrinkage in concrete is primarily due to water loss from evaporation, hydration of cement, or carbonation, leading to a reduction in volume. The volumetric contraction results in volumetric strain in concrete. However, in practice, shrinkage is measured as linear strain, which is one-third of the volumetric strain.
When concrete is still in its plastic state, it can undergo a decrease in volume by about 1% of its absolute volume. This decrease is known as plastic shrinkage. It arises either...
374

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相关实验视频

Updated: Jan 18, 2026

Synthetic, Multi-Layer, Self-Oscillating Vocal Fold Model Fabrication
10:16

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Published on: December 2, 2011

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在固化过程中为3D打印层模拟曲.

Andrey Filippov1, Todd H Weisgraber2, Fangyou Xie3

  • 1Divisions of Computational Engineering, Lawrence Livermore National Laboratory, Livermore, California, USA.

3D printing and additive manufacturing
|September 11, 2025
PubMed
概括
此摘要是机器生成的。

本研究对3D打印的结构进行了建模,考虑了表面张力和温度对材料性能和流动的影响. 该研究使用一种新型建模方法模拟印刷部件的变形.

关键词:
通过3D打印打印3D打印.添加剂制造工艺 添加剂制造工艺设计 设计 设计 设计这些元材料是元材料.新材料 新材料

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Stereolithographic 3D Printing with Renewable Acrylates
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3D Printed Porous Cellulose Nanocomposite Hydrogel Scaffolds
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3D Printed Porous Cellulose Nanocomposite Hydrogel Scaffolds

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相关实验视频

Last Updated: Jan 18, 2026

Synthetic, Multi-Layer, Self-Oscillating Vocal Fold Model Fabrication
10:16

Synthetic, Multi-Layer, Self-Oscillating Vocal Fold Model Fabrication

Published on: December 2, 2011

14.5K
Stereolithographic 3D Printing with Renewable Acrylates
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科学领域:

  • 材料科学 材料科学 材料科学
  • 化学工程是化学工程的重要组成部分.
  • 计算建模 计算建模

背景情况:

  • 弹性体的3D打印具有挑战性,因为它们的复杂质和温度依赖性质.
  • 表面张力在制造过程中显著影响印刷层的结构完整性和几何形状.
  • 了解和预测印刷结构的变形对于优化制造工艺和材料设计至关重要.

研究的目的:

  • 开发一个全面的模型来模拟3D打印的强化聚-二甲基--共-二-结构的行为.
  • 研究表面张力,温度和固化程度对聚合物流量和结构变形的影响.
  • 为了验证模型使用实验数据从风湿学测量和下垂试验验证模型.

主要方法:

  • 采用双相系统模型 (空气和聚合物) 来表示打印层.
  • 扩展的赫歇尔-布克利模型,具有温度依赖的参数,描述了聚合物流动.
  • 不同扫描热量计 (DSC) 数据为固过程的建模提供了信息.
  • 使用各种初始和边界条件进行模拟,以预测结构变形.

主要成果:

  • 该模型成功地捕获了表面张力对结构几何变化的影响.
  • 材料属性的温度依赖性和固化显著影响了聚合物流动和变形.
  • 实验验证证证实了该模型对曲和流动行为的预测能力.

结论:

  • 开发的模型为预测3D打印弹性体的行为提供了一个强大的框架.
  • 准确的模拟温度依赖性质和固化动力学对于模拟打印结构变形至关重要.
  • 这项工作有助于优化基材料的3D打印过程.