Using a Negative Poisson's Ratio to Mitigate Stress Concentrations in Perforated Composite Plates

• Published in: physica status solidi (b) 2024-12, Vol.261 (12), p.n/a
• Main Authors: Harkati, Amine, Chouai, Said, Harkati, El‐Haddi, Bezazi, Abderrezak, Ellagoune, Salah, Scarpa, Fabrizio
• Format: Article
• Language: English
• Subjects: auxetics; composites; simulations; stress concentrations
• ISSN: 0370-1972; 1521-3951
• DOI: 10.1002/pssb.202400115

Stress concentrations pose a significant challenge in designing and optimizing composite components, often resulting in structural alterations and crack formation. This study delves into a detailed numerical and analytical analysis of stress concentration factors in composite materials, with a specific focus on the influence of negative Poisson's ratio and out‐of‐plane modulus. By exploring the interaction of these material properties, the objective is to devise effective strategies for alleviating stress concentrations in composite structures. Through analytical and numerical simulations, a robust correlation between the customized Poisson's ratio and modulus and the mitigation of stress concentration factors, particularly in epoxy/graphite‐reinforced composites are established. This tailored approach has the potential to enhance energy absorption capabilities and consequently reduce the risk of crack propagation in perforated laminated composite plates. This research findings offer valuable insights into composite material design, presenting innovative solutions for enhancing structural integrity and reducing susceptibility to stress‐related issues. There is a significant decrease of stress concentration factors in structural composites made of graphite reinforcements when stacking sequences leading to through‐the‐thickness negative Poisson's ratio are used.