Kumar Yogesh, Rezasefat Mohammad, Zaiemyekeh Zahra, Li Haoyang, Dolez Patricia, Hogan James
Department of Mechanical Engineering, University of Alberta, Edmonton, AB T6G 2R3, Canada.
Department of Human Ecology, University of Alberta, Edmonton, AB T6G 2R3, Canada.
Materials (Basel). 2024 Dec 23;17(24):6296. doi: 10.3390/ma17246296.
This study presents an experimental investigation of the quasi-static and dynamic behavior of a quasi-isotropic carbon-fiber-reinforced composite subjected to in-plane compressive loading. The experiments were performed at strain rates ranging from 4×10-5 to ∼1200 s-1 to quantifythe strain-rate-dependent response, failure propagation, and damage morphology using advanced camera systems. Fiber bridging, kink band formation, dominance of interlaminar failure, and inter-fiber failure fracture planes are evidenced through post-mortem analysis. The evolution of the in-plane compressive strength, failure strength, and stiffness are quantified across the strain rates considered in this study. For an in-depth understanding of the failure propagation, crack speeds were determined in two subsets; (i) primary and secondary cracking, and (ii) the interfaces participating in the crack propagation. Lastly, a modified Zhu-Wang-Tang viscoelastic constitutive model was used to characterize the dynamic stress-strain and compressive behavior of the quasi-isotropic composite under in-plane compression.
本研究对承受面内压缩载荷的准各向同性碳纤维增强复合材料的准静态和动态行为进行了实验研究。实验在应变率范围为4×10⁻⁵至约1200 s⁻¹下进行，以使用先进的摄像系统量化应变率相关响应、失效扩展和损伤形态。通过事后分析证明了纤维桥接、扭结带形成、层间失效主导以及纤维间断裂面。本研究在考虑的应变率范围内对面内抗压强度、失效强度和刚度的演变进行了量化。为了深入了解失效扩展，在两个子集中确定了裂纹速度：(i) 主裂纹和次裂纹，以及 (ii) 参与裂纹扩展的界面。最后，使用改进的朱-王-唐粘弹性本构模型来表征准各向同性复合材料在面内压缩下的动态应力-应变和压缩行为。
