Transient response of doubly-curved bio-inspired composite shells resting on viscoelastic foundation subject to blast load using improved first-order shear theory and isogeometric approach

• Published in: Defence technology Vol. 38; no. 8; pp. 171 - 193
• Main Authors: Tran Thi Thu, Thuy, Nguyen Anh, Tu, Nguyen Thi, Hue, Nguyen Thi, Hong
• Format: Journal Article
• Language: English
• Published: Beijing Elsevier B.V 01.08.2024; KeAi Publishing Communications Ltd; School of Mechanical and Automotive Engineering,Hanoi University of Industry,Hanoi,Viet Nam%Faculty of Technical Fundamental,University of Transport Technology,Hanoi,Viet Nam%Faculty of Mechanical Engineering,Thuyloi University,175 Tay Son,Dong Da,Hanoi,Viet Nam; KeAi Communications Co., Ltd
• Subjects: Biological composite structures; Biological properties; Blast load; Blast loads; Catastrophic collapse; Composite structures; Damping; Design; Dynamic response; Equilibrium equations; Foundations; Hamilton's principle; Investigations; Laminar composites; Mechanical properties; Military engineering; Modified first-order shear theory; Phase transitions; Shear; Shear strain; Shells (structural forms); Structural integrity; Transient response; Viscoelasticity; Biological composite structures; Blast load; Modified first-order shear theory
• ISSN: 2214-9147; 2096-3459; 2214-9147
• DOI: 10.1016/j.dt.2024.02.003

Investigating natural-inspired applications is a perennially appealing subject for scientists. The current increase in the speed of natural-origin structure growth may be linked to their superior mechanical properties and environmental resilience. Biological composite structures with helicoidal schemes and designs have remarkable capacities to absorb impact energy and withstand damage. However, there is a dearth of extensive study on the influence of fiber redirection and reorientation inside the matrix of a helicoid structure on its mechanical performance and reactivity. The present study aimed to explore the static and transient responses of a bio-inspired helicoid laminated composite (B-iHLC) shell under the influence of an explosive load using an isomorphic method. The structural integrity of the shell is maintained by a viscoelastic basis known as the Pasternak foundation, which encompasses two coefficients of stiffness and one coefficient of damping. The equilibrium equations governing shell dynamics are obtained by using Hamilton's principle and including the modified first-order shear theory, therefore obviating the need to employ a shear correction factor. The paper's model and approach are validated by doing numerical comparisons with respected publications. The findings of this study may be used in the construction of military and civilian infrastructure in situations when the structure is subjected to severe stresses that might potentially result in catastrophic collapse. The findings of this paper serve as the foundation for several other issues, including geometric optimization and the dynamic response of similar mechanical structures.