纤维错位和环境温度对纤维复合材料压缩行为的影响
Jonas Drummer1, Felwa Tafesh1, Bodo Fiedler1
1Institute of Polymers and Composites, Hamburg University of Technology, Denickestraße 15, 21073 Hamburg, Germany.
Polymers
|July 14, 2023
概括
玻璃纤维复合材料 (GFRP) 的纤维错位显著影响机械性能,特别是在较低的温度下. 然而,随着温度的升高和损伤机制的转移,这种效应会减弱.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 复合材料 复合材料 复合材料
背景情况:
- 了解纤维增强聚合物的缺陷对于预测其性能至关重要.
- 纤维错位是复合材料制造中的常见缺陷,可能会损害机械完整性.
- 玻璃纤维复合材料 (GFRP) 广泛使用,需要对其缺陷耐受性进行研究.
研究的目的:
- 实验性地研究特定纤维错位 (折叠,波浪,平面内波浪) 对GFRP压缩机械行为的影响.
- 通过改变矩阵属性来评估温度变化如何影响复合材料对这些缺陷的反应.
- 在不同的热条件下,确定缺陷比例和机械性能降低之间的相关性.
主要方法:
- 使用树脂转移成型,制造具有受控纤维错位的GFRP交叉折叠.
- 在四种不同的温度下进行压力机械试验 (例如,室温,升温).
- 分析由此产生的机械数据,以量化缺陷和温度对强度和故障机制的影响.
主要成果:
- 纤维错位显著降低了GFRP的压力机械性能,特别是在较低的温度下.
- 观察到的性能降低超过了缺陷的体积比例.
- 温度上升使主要的损伤机制从纤维主导转变为矩阵主导.
结论:
- 纤维错位是影响GFRP压力强度的关键缺陷,其影响取决于温度.
- 在更高的温度下,矩阵性质在损伤机制中起着更为主导的作用,减少了纤维错位的意义.
- 在压缩下GFRP的性能是缺陷类型,比例和操作温度的复杂相互作用.
更多相关视频
07:15A Testing Platform for Durability Studies of Polymers and Fiber-reinforced Polymer Composites under Concurrent Hygrothermo-mechanical Stimuli
Published on: December 11, 2014
13.8K
11:07Preparation of Aligned Steel Fiber Reinforced Cementitious Composite and Its Flexural Behavior
Published on: June 27, 2018
11.2K
相关概念视频
Thermal Stress
2.5K
If the temperature of an object is changed while it is prevented from expanding or contracting, the object is subjected to stress. The stress is compressive if the object expands in the absence of constraint and tensile if it contracts. This stress resulting from temperature change is known as thermal stress. It can be quite large and can cause damage. To avoid this stress, engineers may design components so they can expand and contract freely. For instance, on highways, gaps are deliberately...
2.5K
Behavior of Concrete Under Compressive Load
222
Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
As the concrete specimen fractures under...
As the concrete specimen fractures under...
222
Bending of Members Made of Several Materials
228
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...
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each...
228
Fiber Reinforced Concrete
103
Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...
103
Temperature Dependent Deformation
174
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...
174
Cold Weather Concreting
96
When freshly poured concrete is exposed to freezing temperatures before it has set, the water within the concrete can freeze. This expansion disrupts the setting process, delays chemical reactions necessary for hardening, and increases the volume of pores within the hardened concrete, which weakens its overall structure. If the concrete manages to reach an appreciable strength before it freezes, the damage can be somewhat mitigated.
To counteract the negative impacts of cold weather, ensuring...
To counteract the negative impacts of cold weather, ensuring...
96
