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相关概念视频

Plastic Behavior01:21

Plastic Behavior

219
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...
219
Residual Stresses01:26

Residual Stresses

240
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...
240

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相关实验视频

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Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold
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开发3D打印形状记忆聚合物混合物的弹性参数.

Truman J Cavender-Word1,2, David A Roberson1,2

  • 1Polymer Extrusion Lab, The University of Texas at El Paso, El Paso, TX 79968, USA.

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

一个新的弹性参数量化了形状记忆聚合物 (SMP) 在损坏后的强度保留. /TPU混合物表现出极好的弹性,而ABS/SEBS表现出良好的弹性,而/SEBS表现出不良的弹性.

科学领域:

  • 材料科学 材料科学 材料科学
  • 聚合物科学 聚合物科学
  • 机械工程 机械工程

背景情况:

  • 形状记忆聚合物 (SMP) 提供了自我修复和减少浪费的潜力.
  • 评估损坏后的材料弹性对于实际应用至关重要.
  • 增材制造 (AM) 为SMP制造提供了新的途径.

研究的目的:

  • 建立一个弹性参数来量化SMP在损坏恢复后的抗拉强度保留.
  • 描述三种不同的SMP混合物的弹性,这些混合物是通过化丝制造 (FFF) 和注塑 (IM) 制造而制造的.
  • 评估变形回收对这些SMP混合物的机械性能的影响.

主要方法:

  • 三种50/50重量%的SMP混合物的特性:PLA/SEBS-g-MA,ABS/SEBS-g-MA,以及PLA/TPU.
  • 使用化丝制造 (FFF) 和注塑 (IM) 制造样本的制造.
  • 拉力测试用于评估拉力强度与变形恢复百分比的变化.

主要成果:

  • 聚烯/TPU混合物表现出极好的弹性,注射成型样品在变形恢复后显示强度增加.
  • 该ABS/SEBS混合物表现出良好的弹性,不管变形恢复如何,保持一致的强度.
  • PLA/SEBS混合物表现出不良的弹性,随着初始变形的增加,拉力强度下降.
关键词:
添加剂制造 添加剂制造 添加剂制造化丝制造工艺 化丝制造工艺注塑成型的注射成型是什么自愈的聚合物可以自愈.形状记忆的聚合物和聚合物.

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结论:

  • 开发的弹性参数有效地评估了损坏后的SMP性能.
  • 制造方法影响某些SMP混合物的弹性,特别是PLA/TPU.
  • 增强SMP的弹性可以通过提高材料的寿命和可修复性来减轻塑料废物.