目的 针对纤维金属层合板（FMLs）非对称试样在端部加载劈裂（ELS）试验中因残余热应力导致Ⅱ型层间断裂韧性测定出现偏差的问题,建立表观断裂韧性修正方法,提高异质界面性能评价与抗分层设计参数的准确性,为冲击、侵彻和爆炸载荷下FMLs的分层损伤控制、结构完整性保持及先进防护装备的损伤容限设计提供理论支撑。方法 基于FMLs混合界面及非对称层合结构特征,分析残余热应力对ELS测试结果的影响,提出表观断裂韧性理论修正方法,并结合不同温度条件下的ELS试验和有限元仿真对其有效性进行验证。结果 在相同温度下,对CFRP-铝合金纤维金属层板层间裂纹稳定扩展阶段的界面Ⅱ型断裂韧性进行分析时,未修正的平均表观断裂韧性差值最高约为1 354 J/m2,而经修正后,最大差值降至约244 J/m2,测试结果离散性明显降低。结论 残余热应力会显著影响非对称FMLs试样ELS测试所得表观断裂韧性。采用所提出的修正方法能够有效降低热应力引起的评价误差,提高界面Ⅱ型断裂韧性的评价准确性,为FMLs结构抗分层设计提供更可靠的参数支撑。
Abstract
To address the bias in the measured Mode II interlaminar fracture toughness of asymmetric fiber-metal laminate (FML) specimens caused by residual thermal stresses during end-loaded split (ELS) test, the work aims to develop a correction method for the apparent fracture toughness to improve the accuracy of heterogeneous-interface characterization and the reliability of design parameters for delamination resistance, providing theoretical support for controlling delamination damage, maintaining structural integrity, and designing damage-tolerant FML components for advanced protective equipment subjected to impact, penetration, and blast loading. Based on the characteristics of the hybrid interfaces and asymmetric laminate configurations of FMLs, the effect of residual thermal stresses on ELS test results was analyzed, and a theoretical correction method for the apparent fracture toughness was proposed. Its effectiveness was validated through ELS tests conducted at different temperatures and finite element simulations. For the interfacial Mode II fracture toughness of CFRP/aluminum-alloy FMLs during stable interlaminar crack propagation at the same temperature, the maximum difference between the uncorrected mean apparent fracture toughness values was approximately 1 354 J/m2, whereas the maximum difference decreased to approximately 244 J/m2 after correction, with a marked reduction in the scatter of the test results. These findings demonstrate that residual thermal stresses significantly affect the apparent fracture toughness obtained from ELS tests on asymmetric FML specimens. The proposed correction method effectively reduces the evaluation error induced by thermal stresses, improves the accuracy of interfacial Mode II fracture toughness measurements, and provides more reliable parameters for the delamination-resistant design of FML structures.
关键词
超混杂复合材料 /
断裂韧性 /
Ⅱ型分层扩展 /
热残余应力 /
内聚力模型
Key words
fibre-metal laminates /
fracture toughness /
Mode II delamination propagation /
thermal residual stress /
cohesive zone model
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