应力状态与应变率对平纹编织CFRP面内力学行为的影响

张雪松; 孙晓旺; 王显会; 姚土灶; 肖杉雨; 许丁鹏; 付条奇; 何佳豪

应力状态与应变率对平纹编织CFRP面内力学行为的影响

张雪松^{1, 2},
孙晓旺^{1, 2, ,},
王显会^{1, 2},
姚土灶^{1, 2},
肖杉雨^{1, 2},
许丁鹏^{1, 2},
付条奇^{1, 2},
何佳豪^{1, 2}

1.
南京理工大学　机械工程学院, 南京 210094
2.
先进越野系统技术全国重点实验室, 北京 100072

基金项目: 国家自然科学基金 (52272370)；先进越野系统技术全国重点实验室开放基金项目

详细信息

通讯作者:
孙晓旺，博士，副教授，硕士生导师，研究方向为材料动态力学行为、车辆结构优化设计　E-mail: xwsun@njust.edu.cn

中图分类号: TB332
计量
- 文章访问数: 33
- HTML全文浏览量: 16
- 被引次数: 0
出版历程
- 收稿日期: 2024-07-01
- 修回日期: 2024-07-24
- 录用日期: 2024-08-08
- 网络出版日期: 2024-08-30

Effects of stress state and strain rate on the in-plane mechanical behavior of plain woven CFRP

ZHANG Xuesong^{1, 2},
SUN Xiaowang^{1, 2
, ,},
WANG Xianhui^{1, 2},
YAO Tuzao^{1, 2},
XIAO Shanyu^{1, 2},
XU Dingpeng^{1, 2},
FU Tiaoqi^{1, 2},
HE Jiahao^{1, 2}

1.
School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
2.
Chinese Scholar Tree Ridge State Key Laboratory, Beijing 100072, China

Funds: National Natural Science Foundation of China (52272370); Open Fund of Chinese Scholar Tree Ridge State Key Laboratory

摘要

摘要: 平纹编织碳纤维增强聚合物基复合材料(Plain Weave Carbon Fiber Reinforced Polymer，PWCFRP)因其均匀的面内力学性能而被广泛应用于航空、航天、车辆等工程领域，但其力学性能的表征和失效机制的揭示一直是应用中的难点。为探究应力状态与应变率对PWCFRP面内力学行为的影响，进行了准静态拉伸、压缩、剪切实验和动态拉伸实验，分析了材料的力学性能与损伤机制，并基于Tsai-Wu失效准则定量分析了材料在多轴应力状态、不同应变率、不同离轴角下的失效包络。结果表明：准静态载荷下PWCFRP表现出显著的拉压不对称性，拉伸强度相较压缩强度提高了120.46%；拉伸和剪切载荷下PWCFRP的力学行为具有非线性。拉伸状态下材料的失效主要为纤维束的拉伸断裂，断裂位置呈现一定随机性；压缩状态下材料的失效主要是由局部高剪切应力引起的纤维束扭结断裂导致的，断裂角度约呈37°；剪切状态下材料的失效模式主要为树脂的拉剪耦合失效。动态拉伸载荷下PWCFRP的拉伸强度随着应变率的提高先增大后减小，2000 s⁻¹应变率时强度值最高。多轴应力状态下，PWCFRP的拉伸强度和应变率效应显著程度均与离轴角度(0°~45°)呈负相关趋势。
- 平纹编织碳纤维 /
- 应力状态 /
- 应变率效应 /
- 力学行为 /
- 失效包络
Abstract: Plain Weave Carbon Fiber Reinforced Polymer (PWCFRP) is widely used in engineering fields such as aviation, aerospace, and vehicles due to its uniform in-plane mechanical properties. However, its mechanical properties and failure mechanisms have always been difficulties in application. In order to explore the effects of stress state and strain rate on the in-plane mechanical behavior of PWCFRP, we conducted quasi-static tension, compression, shear experiments and dynamic tension experiments to analyze the mechanical properties and damage mechanism of the material, and based on the Tsai-Wu failure criterion, the failure envelope of the material under multi-axial stress state, different strain rates and different off-axis angles was quantitatively analyzed. The results show that under quasi-static load, PWCFRP shows significant tension-compression asymmetry, and the tensile strength is increased by 120.46% compared to the compressive strength; under tensile and shear loads, the mechanical behavior of PWCFRP is nonlinear. The failure of the material in the tensile state is mainly caused by the tensile fracture of the fiber bundles, and the fracture location shows a certain randomness; the material failure in the compressed state is mainly caused by the kink fracture of the fiber bundles caused by local high shear stress, and the fracture angle is approximately 37°; the failure mode of the material in the shear state is mainly the tensile-shear coupling failure of the resin. Under dynamic tensile load, the tensile strength of PWCFRP first increases and then decreases with the increase of strain rate, with the highest strength value at the strain rate of 2000 s⁻¹. Under the multi-axial stress state, the tensile strength and the significance of the strain rate effect of PWCFRP show a negative correlation trend with the off-axis angle (0°-45°).
- plain woven carbon fiber /
- stress state /
- strain rate effect /
- mechanical behavior /
- failure envelope

HTML全文

图 1 样件制备流程

Figure 1. Preparation process of the experimental sample

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图 2 准静态面内力学实验装置

Figure 2. Quasi-static in-plane mechanics experimental device

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图 3 SHTB实验装置

Figure 3. SHTB experimental device

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图 4 PWCFRP准静态拉伸真实应力-应变曲线

Figure 4. Quasi-static tensile true stress-strain curve of PWCFRP

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图 5 PWCFRP准静态拉伸宏观损伤

Figure 5. Macroscopic damage of PWCFRP during quasi-static tensile testing

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图 6 PWCFRP准静态拉伸细观损伤

Figure 6. Microscopic damage of PWCFRP during quasi-static tensile testing

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图 7 PWCFRP准静态压缩真实应力-应变曲线

Figure 7. Quasi-static compression true stress-strain curve of PWCFRP

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图 8 PWCFRP准静态压缩宏观损伤

Figure 8. Macroscopic damage of PWCFRP during quasi-static compression testing

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图 9 PWCFRP准静态压缩细观损伤

Figure 9. Microscopic damage of PWCFRP during quasi-static compression testing

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图 10 PWCFRP准静态剪切真实应力-应变曲线

Figure 10. Quasi-static shear true stress-strain curve of PWCFRP

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图 11 PWCFRP准静态剪切宏观损伤

Figure 11. Macroscopic damage of PWCFRP during quasi-static shear testing

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图 12 PWCFRP准静态剪切细观损伤

Figure 12. Microscopic damage of PWCFRP during quasi-static shear testing

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图 13 PWCFRP动态面内拉伸真实应力-应变曲线

Figure 13. True stress-strain curve of PWCFRP in-plane dynamic tension

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图 14 PWCFRP动态拉伸宏观损伤

Figure 14. Macroscopic damage of PWCFRP during dynamic tensile testing

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图 15 PWCFRP拉伸强度-应变率关系拟合

Figure 15. Fitting of tensile strength-strain rate relationship of PWCFRP

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图 16 PWCFRP多轴正应力状态下失效包络线

Figure 16. Failure envelope of PWCFRP under multiaxial normal stress state

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图 17 PWCFRP在不同离轴角下的强度

Figure 17. Strength of PWCFRP at different off-axis angles

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表 1 准静态力学实验设计

Table 1. Experimental design of quasi-static mechanics

Sample number	Displacement rate/(mm·min⁻¹)	Strain rate/s⁻¹
T-0-1 ~ T-0-5	0.9	1×10⁻⁴
C-0-1 ~ C-0-5	0.08
S-12-1 ~ S-12-5	0.18
Notes：T represents tensile test; C represents compression test; S represents shear plane; 0 represents the warp direction of the yarn; 12 represents the in-plane shear plane; 1~5 represents the test number value.

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