Crushing analysis and crashworthiness characteristics of auxetic metamaterials: design space exploration with multi-objective optimization

被引：0
作者：
Chikkanna, Niranjan [1 ]
Krishnapillai, Shankar [1 ]
Amirthalingam, Murugaiyan [2 ]
Ramachandran, Velmurugan [3 ]
机构：
[1] Indian Inst Technol Madras, Dept Mech Engn, Madras, India
[2] Indian Inst Technol Madras, Dept Met & Mat Engn, Madras, India
[3] Indian Inst Technol Madras, Dept Aerosp Engn, Madras, India
来源：
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES | 2025年
关键词：
Auxetic materials; architected materials; crashworthiness; lightweight structures; metamaterials; TUBES;
D O I：
10.1080/15397734.2025.2461224
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
The transportation industry is under increasing pressure to reduce weight and volume while enhancing safety to meet evolving standards. One effective solution is the adoption of lightweight structures in vehicle design. Cellular structures, known for their lightweight and energy absorption properties, are highly applicable in this context. Auxetic metamaterials, a new class of cellular materials with a negative Poisson's ratio (NPR), expand under tensile load and densify under compressive load. This unique behavior improves performance and crashworthiness compared to conventional materials. This study examines the crushing performance and crashworthiness of the reentrant diamond auxetic (RDA) metamaterial, a previously unstudied type. Using the design of experiments (DOE), the study explores how structural parameters influence dynamic crushing and crashworthiness. Response surface-based surrogate models and multi-objective optimization are used to balance injury-based and energy-based crashworthiness metrics, which often conflict. The optimized structure achieves an energy absorption of 2669 J and a specific energy absorption (SEA) of 10.5 J/g, representing improvements of 71% and 22% over regular reentrant auxetic metamaterials and 230% and 42% over hexagonal honeycomb structures of the same unit cell size, respectively.
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页数：23
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