对CFRP层材的闪电损伤和残余强度进行数值研究,考虑热应力诱导的分层
Qian-Zhi Yin1, Jiapeng Bian1, Yin Fan1
1School of Aeronautics and Astronautics, Shanghai Jiao Tong University, Shanghai 200240, China.
Polymers
|August 28, 2025
概括
这项研究模拟了碳纤维增强聚合物 (CFRP) 复合材料的闪电损伤,包括分层. 模型准确地预测了压力降低, 这对于航空安全至关重要.
科学领域:
- 材料科学
- 航空航天工程
- 计算力学
背景情况:
- 对碳纤维增强聚合物 (CFRP) 闪电损伤的数值研究往往忽略了分层,影响了残余强度分析.
- 准确预测CFRP复合材料的闪电损伤对于航空安全和结构完整性至关重要.
研究的目的:
- 开发和验证电热机械合数值模型,用于预测CFRP复合材料的闪电诱导分层和损坏.
- 研究输入负荷和堆叠序列对层间热解和分层的影响.
- 量化评估分层对冲击后压力强度的影响.
主要方法:
- 建立一个结合的电热机械数值模型,其中包含凝聚性元素来模拟分层.
- 对不同输入负载 (电流幅度,波形) 和层叠序进行参数研究.
- 基于模拟的冲击后单轴最终压力负荷的定量损伤评估.
主要成果:
- 与没有分层的模型 (21.12%) 相比,采用分层的模型预测压力降低了28.91%,与实验结果 (36.72%) 一致.
- 热分层有助于显著降低压力强度,特别是在热和冲击波负荷的组合下.
- 闪电波形 (C与D) 影响损坏机制;C波形需要考虑弧热效应,而D波形涉及冲击负荷和热效应. 较高的电流幅度和对称的堆叠序列加重了损伤.
结论:
- 通过整合热分层和机械降解,开发的模型提高了多物理真实性.
- 这些发现凸显了CFRP在闪电损坏中的关键作用,因此需要将其纳入数值模型.
- 这项研究为优化先进航空复合结构中的闪电阻力提供了基础见解.
更多相关视频
09:54Author Spotlight: Enhancing Fiber Composite Laminate Quality with the Wet Hand Lay-Up/Vacuum Bag Process
Published on: June 30, 2023
2.3K
07:15A Testing Platform for Durability Studies of Polymers and Fiber-reinforced Polymer Composites under Concurrent Hygrothermo-mechanical Stimuli
Published on: December 11, 2014
13.9K
相关概念视频
Residual Stresses in Bending
250
In the study of elastoplastic members subjected to bending moments, understanding the loading and unloading phases is crucial for assessing material behavior and structural integrity. During the loading phase, as the bending moment increases, the material initially responds elastically, adhering to Hooke's Law, where stress is directly proportional to strain. When the load exceeds the yield strength, plastic deformation occurs, resulting in permanent strain and deformation that remains even...
250
Fatigue
237
Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
237
Design Consideration
319
Designing a structure involves a series of considerations, primarily the material's ultimate strength, calculated through tests that measure changes under increased force until the material reaches its breaking point or limit. The ultimate load, where the material breaks, is divided by its original cross-sectional area, resulting in the ultimate normal stress or strength. The ultimate shearing stress is another significant factor taken into account.
The factor of safety is another key...
The factor of safety is another key...
319
Yield Criteria for Ductile Materials under Plane Stress
213
In designing structural elements and machine parts using ductile materials, it is crucial to ensure that these components withstand applied stresses without yielding. Yielding is initially determined through a tensile test, which evaluates the material's response to uniaxial stress. However, tensile stress is insufficient when components face biaxial or plane stress conditions This condition requires advanced criteria to predict failure.
The Maximum Shearing Stress Criterion, also known as...
The Maximum Shearing Stress Criterion, also known as...
213
Residual Stresses
275
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...
275
Stress-Strain Diagram - Ductile Materials
970
The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...
970
