形状元素对联合挤压热塑性复合材料微观结构和机械性能的影响
Rebecca Olanrewaju1, Yuefang Jiang2, Thao Nguyen2
1Francis College of Engineering, University of Massachusetts Lowell, Lowell, MA 01854, USA.
Polymers
|October 16, 2025
概括
形成形状的元素 (SFEs) 通过控制接口架构来提高聚合物复合材料的性能. 虽然在加工中有效,但材料不兼容性和水分对实现SFEs构成挑战.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物工程 聚合物工程
- 复合材料 复合材料 复合材料
背景情况:
- 聚合物不混合性往往导致界面粘附性差,限制复合材料的机械性能.
- 控制接口架构对于先进的聚合物复合材料至关重要.
- 需要新的加工技术来克服固有的材料限制.
研究的目的:
- 引入和评估用于联合挤出模具的成形元件 (SFEs).
- 研究SFEs对聚合物复合材料的界面架构和机械性能的影响.
- 探索与SFEs和不相似的聚合物相关的加工挑战.
主要方法:
- 仿真和原型的碎形灵感的SFEs.
- 使用液晶聚合物 (Vectra A950) 和循环合物聚胺 (Trogamid CX7323) 的建筑复合材料的联合挤出.
- 机械测试 (拉伸模量,断裂时应力) 和横截面分析.
主要成果:
- 在不同类型的聚合物共挤出中,SFEs表现出有效性.
- 在拉力比率和拉力特性 (模块和断裂时的应力) 之间发现了强烈的正相关性.
- 模拟和实验截面之间观察到显著差异,归因于界面不稳定性和材料不兼容性.
结论:
- SFE为设计具有增强机械性能的建筑聚合物复合材料提供了一个有前途的方法.
- 解决聚合物不兼容性和湿度管理对于成功的SFEs实际应用至关重要.
- 需要进一步的研究来优化SFEs的加工参数和材料选择.
相关概念视频
Bending of Members Made of Several Materials
556
In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each material's...
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each material's...
556
Members Made of Elastoplastic Material
367
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...
As the bending moment...
367
Plastic Behavior
519
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...
519
Plastic Deformations
421
Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
421
Plastic Deformations
399
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...
399
Plastic Deformation in Circular Shafts
443
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...
443


