Effects of Forced Cooling on High Cycle Fatigue Properties of Glass Fiber-Vinyl Resin Composites
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摘要: 为研究强制风冷对单向拉挤成型玻璃纤维/乙烯树脂复合材料疲劳性能的影响，进行了准静态拉伸试验，获取其破坏极限载荷并且分析其破坏模式. 在此基础上，采用带有强制风冷的高频疲劳试验机以及监控温度变化的红外摄像机，研究了有无强制风冷措施下该复合材料拉-拉疲劳行为，对比分析了有无强制风冷措施对试件疲劳寿命的影响规律. 试验结果表明：在155~240 MPa应力水平下，未施加强制风冷措施试件表面温度快速上升导致试件失效，而在155 MPa应力水平以下，温度先缓慢上升后出现稳态；采用强制风冷措施后，试件表面温度降低，疲劳寿命显著增长，且在140 MPa应力水平以下，有无强制风冷措施对试件的疲劳寿命无明显影响. 同时，试件疲劳断口以基体开裂为主. 该文所探究的试验方法为纤维增强复合材料疲劳试验设计提供参考和帮助.
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关键词:
- 玻璃纤维增强复合材料 /
- S-N曲线 /
- 红外监测 /
- 刚度退化
Abstract: To study the effects of forced air cooling on the fatigue performance of glass fiber-vinyl resin composites fabricated through unidirectional pultrusion, a quasi-static tensile test was carried out to obtain the ultimate load of failure and analyze its failure modes. On this basis, a high-frequency fatigue testing device with forced air cooling and an infrared camera to monitor the temperature change were used to study the pull-pull fatigue behavior of the composite with or without forced air cooling, and the effects of the forced air cooling on the fatigue life of the specimen were compared and analyzed. The test results show that, under a stress level within 155~240 MPa, the surface temperature of the specimen without forced air cooling measures rises rapidly, leading to the failure of the specimen, while under a stress level of 155 MPa, the temperature rises slowly first and then stabilizes. After forced air cooling, the surface temperature of the specimens will decrease, and the fatigue life will increase significantly, and the stress level will stay below 140MPa. The fatigue life of the specimens is not significantly influenced by forced air cooling measures. Furthermore, the fatigue fracture of the sample is mainly based on the matrix cracking. The proposed experimental method provides reference and guidance for fatigue experimental design of fiber reinforced composites.-
Key words:
- GFRP /
- S-N curve /
- infrared monitoring /
- stiffness degradation
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图 2 高周疲劳试验装置及强制风冷示意图
Figure 2. The high cycle fatigue test device and the forced air cooling diagram
图 4 GFRP试件拉伸失效宏观破坏形貌
注 为了解释图中的颜色，读者可以参考本文的电子网页版本，后同.
Figure 4. Macroscopic failure patterns of the GFRP specimens in tensile failure
图 5 有无强制风冷措施下GFRP试件S-N曲线对比
Figure 5. Comparison of S-N curves of the GFRP specimens with and without forced air cooling
图 6 GFRP试件表面最高温度随循环次数变化规律
Figure 6. The maximum surface temperature-cycle index curves of the GFRP specimens
图 7 GFRP在典型应力水平下疲劳试件表面温度分布
Figure 7. Surface temperature distributions of the GFRP under typical stress levels
图 8 GFRP试件在不同应力水平下固有频率随循环次数变化曲线
Figure 8. Frequency-cycle times curve of GFRP specimens under different stress levels
图 9 GFRP在不同应力水平下疲劳失效宏观形貌
Figure 9. Macroscopic failure patterns of the GFRP specimens in fatigue under different stress levels
表 1 拉伸试验结果
Table 1. The results of the tensile test
test coupons №. tensile strength/MPa tensile modulus/GPa elongation at break/% T-1 389.5 28.8 1.37 T-2 412.4 31.7 1.30 T-3 408.1 31.3 1.30 average value 403.3 30.6 1.32 
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