| 服役低温老化对铝合金-玄武岩纤维增强树脂复合材料粘接接头力学性能的影响及失效预测 |
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| 引用本文： | 栾建泽,那景新,谭伟,慕文龙,秦国锋.服役低温老化对铝合金-玄武岩纤维增强树脂复合材料粘接接头力学性能的影响及失效预测[J].复合材料学报,2020,37(8):1884-1893. |
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| 作者姓名： | 栾建泽 那景新 谭伟 慕文龙 秦国锋 |
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| 作者单位： | 1.吉林大学 汽车仿真与控制国家重点试验室，长春 130022 |
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| 基金项目： | 国家自然科学基金(51775230)；吉林大学研究生创新研究计划项目(101832018C198) |
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| 摘 要： | 为了给铝合金-玄武岩纤维增强树脂(BFRP)复合材料粘接结构在汽车工业中的应用提供参考和指导，加工了铝合金-BFRP复合材料粘接接头。结合汽车服役中的温度区间，选取?10℃和?40℃的低温老化环境，对接头进行0、10、20、30天的老化。对老化后的粘接接头进行准静态拉伸试验和剪切试验，得到不同老化时间下铝合金-BFRP粘接接头的准静态失效强度。结合DSC和FTIR分析低温老化对BFRP复合材料的影响，并对粘接接头的失效断面进行宏观分析和SEM分析。结果表明:在低温老化环境中，胶粘剂与BFRP复合材料的化学性质受低温老化作用影响不大，BFRP中的官能团与玻璃化转变温度(Tg)没有发生明显的变化，接头的失效强度和失效模式主要受胶粘剂与粘接基材的热应力影响。对于拉伸接头，随着低温老化时间的增加，BFRP复合材料纤维与树脂基体间的结合力降低，铝合金-BFRP复合材料接头的失效断面中纤维撕裂的比例逐渐减少，拉伸接头失效强度逐渐下降。老化后剪切接头仍为内聚失效，BFRP复合材料的低温老化对铝合金-BFRP复合材料剪切接头的失效强度几乎没有影响，剪切接头失效强度的下降主要是胶粘剂与粘接基材热膨胀系数不一致引起的热应力的影响。采用二次应力准则公式对?10℃和?40℃低温环境下，拉应力、剪应力值随老化时间的变化规律进行了拟合，在此失效准则的基础上，根据响应面原理，建立接头失效强度随老化时间变化的三维曲面，为粘接技术在车身结构中的工程应用提供参考。
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| 关 键 词： | 玄武岩纤维增强树脂复合材料 粘接 低温 老化 失效预测 |
| 收稿时间： | 2019-08-27 |
Effect of service low-temperature aging on mechanical properties of aluminum alloy-basalt fiber reinforced polymer composite bonding joints and failure prediction |
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| Affiliation: | 1.State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130022, China2.Teachers College for Vocational and Technical Education, Guangxi Normal University, Guilin 541004, China |
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| Abstract: | In order to provide reference and guidance for the application of aluminum alloy-basalt fiber reinforced polymer (BFRP) composite bonding structure in automobile industry, the aluminum alloy-BFRP bonding joints were manufactured. Considering the temperature range in the service of automobiles, the low-temperature aging environment of ?10℃ and ?40℃ was selected to accelerate the aging of joints for 0, 10, 20 and 30 days. The quasi-static tensile test and shear test were carried out on the bond joints after aging, and the quasi-static failure strength of aluminum alloy-BFRP composite bonding joints with different aging time was obtained. DSC and FTIR were combined to analyze the influence of low temperature aging on the chemical properties of adhesive joints, and the failure section of adhesive joints was analyzed by macroscopic analysis and SEM. The results show that the chemical properties of aluminum alloy-BFRP composite bonding joints are not significantly affected by the low-temperature aging, and the functional groups and glass conversion temperature (Tg) of BFRP composite do not change significantly in the low-temperature aging environment. The failure strength and failure mode of the joints are mainly affected by the thermal stress of adhesive and bonding substrate. As for tensile joints, with the increase of low-temperature aging time, the mechanical properties between BFRP composite fiber and resin matrix decrease, the proportion of fiber tearing in the failure section of aluminum alloy-BFRP composite joint decreases gradually, and the failure strength of tensile joints decreases gradually. After aging, the shear joint is still a cohesive failure, and the low-temperature aging of BFRP composite has little effect on the mechanical properties of aluminum alloy-BFRP composite joint. The decrease of failure strength of shear joint is mainly caused by the thermal stress which is the result of the inconsistency of thermal expansion coefficient between adhesive and bonding substrate. The second stress criterion formula was used to fit the variation rules of tensile stress and shear stress with aging time. On the basis of this failure criterion, according to the response surface principle, the three-dimensional surface of failure criterion with aging time was established to provide reference for the engineering application of bonding technology in body structure. |
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