Hu Haichao, Wei Qiang, Wang Tianao, Ma Quanjin, Pan Shupeng, Li Fengqi, Wang Chuancai, Ding Jie
School of Mechanical Engineering, Tianjin Sino-German University of Applied Sciences, Tianjin 300350, China.
School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300401, China.
Polymers (Basel). 2025 Mar 21;17(7):846. doi: 10.3390/polym17070846.
This study introduces a method for predicting the tensile properties of high-strength steel/carbon fiber-reinforced polymer (CFRP) composite laminates using Metal Volume Fraction (MVF) theory. DP590 and DP980 high-strength steels (thickness ~0.8 mm) were selected as substrates, and composite laminates were fabricated by compression molding with CFRP prepreg. Tensile tests were performed on an MTS universal testing machine, and fracture morphology was analyzed using scanning electron microscopy (SEM). The results demonstrated a typical mixed failure mode: necking and fracture in the metal layer, and neat fiber fracture in the CFRP layer. Comparisons of experimental tensile strength with theoretical predictions revealed that the model based on the metal strength at fracture significantly outperformed the model using tensile strength for predictions, with narrower error ranges. For example, the error for DP590/CFRP laminates ranged from 2.31% to 12.89%, whereas for DP980/CFRP laminates, it was -6.12%. Additionally, the study showed that using metals with higher plasticity in fiber metal laminates could underutilize the metal layer's potential at peak stress, leading to significant deviations when predictions rely on tensile strength. Therefore, it is recommended to use the metal strength corresponding to peak stress for more accurate MVF-based tensile property predictions. This method provides a robust theoretical foundation for predicting the tensile performance of high-strength steel/CFRP laminates, aiding in optimizing structural designs for automotive and aerospace applications. Future research could explore the effects of different metal and fiber combinations, as well as more complex stacking designs.
本研究介绍了一种利用金属体积分数（MVF）理论预测高强度钢/碳纤维增强聚合物（CFRP）复合层压板拉伸性能的方法。选用DP590和DP980高强度钢（厚度约0.8毫米）作为基材，采用CFRP预浸料通过模压成型制备复合层压板。在MTS万能试验机上进行拉伸试验，并使用扫描电子显微镜（SEM）分析断裂形态。结果表明存在典型的混合失效模式：金属层出现颈缩和断裂，CFRP层出现整齐的纤维断裂。实验拉伸强度与理论预测值的比较表明，基于断裂时金属强度的模型在预测方面明显优于使用抗拉强度的模型，误差范围更窄。例如，DP590/CFRP层压板的误差范围为2.31%至12.89%，而DP980/CFRP层压板的误差为-6.12%。此外，研究表明，在纤维金属层压板中使用塑性较高的金属可能会在峰值应力下未充分发挥金属层的潜力，导致在依赖抗拉强度进行预测时出现显著偏差。因此，建议使用与峰值应力对应的金属强度进行基于MVF的更准确的拉伸性能预测。该方法为预测高强度钢/CFRP层压板的拉伸性能提供了坚实的理论基础，有助于优化汽车和航空航天应用的结构设计。未来的研究可以探索不同金属和纤维组合以及更复杂堆叠设计的影响。
