Torabi Ali Reza, Motamedi Mohammad Amin, Bahrami Bahador, Noushak Meghdad, Cicero Sergio, Álvarez José Alberto
Fracture Research Laboratory, Faculty of New Sciences and Technologies, University of Tehran, Tehran 14395-1561, Iran.
Fatigue and Fracture Research Laboratory, School of Mechanical Engineering, Iran University of Science and Technology, Narmak, Tehran 16846, Iran.
Polymers (Basel). 2022 Aug 9;14(16):3246. doi: 10.3390/polym14163246.
This paper evaluates the fracture of notched epoxy matrix composites using the Brazilian disk (BD) test from both numerical and experimental points of view. The study began with a comprehensive experimental program covering three different composite lay-ups (quasi-isotropic, unidirectional, and cross-ply) and various geometries of U and V notches. Specifically, the BD samples combined the three layouts, four different notch angles, and three notch radii with three specimens per combination, leading to an overall number of 108 fracture tests. The experiments showed the appropriateness of the BD test for the study of the fracture behavior of composite materials and provided a good pool of data for further investigations. Subsequently, the virtual isotropic material concept (VIMC) was applied in combination with two fracture criteria to theoretically predict the experimentally acquired fracture loads. This study demonstrated that using the VIMC approach can provide robust predictions while incurring much lower computational costs compared to the conventional approaches found in the literature.
本文从数值和实验两个角度，使用巴西圆盘（BD）试验评估带缺口环氧基复合材料的断裂情况。该研究始于一个全面的实验计划，涵盖三种不同的复合材料铺层（准各向同性、单向和正交铺层）以及U型和V型缺口的各种几何形状。具体而言，BD试样将三种布局、四种不同的缺口角度和三种缺口半径相结合，每种组合有三个试样，总共进行了108次断裂试验。实验表明BD试验适用于研究复合材料的断裂行为，并为进一步研究提供了丰富的数据。随后，虚拟各向同性材料概念（VIMC）与两种断裂准则相结合，从理论上预测实验获得的断裂载荷。本研究表明，与文献中发现的传统方法相比，使用VIMC方法可以提供可靠的预测，同时计算成本要低得多。
