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A platform for research: civil engineering, architecture and urbanism
Topology optimization design of recoverable bistable structures for energy absorption with embedded shape memory alloys
https://orcid.org/0009-0004-5585-3542
https://orcid.org/0000-0001-9296-0583
Highlights A bi-layer curved beam structure incorporating SMAs layer is designed to achieve high-energy absorption and controllable phase transition properties. Non-gradient topology optimization of the SMAs distribution is proposed to enhance energy absorption capacity. The influence of bi-layer curved beam thickness on design outcomes is analyzed while emphasizing the critical roles of SMAs and nylon layers. The stacking strategies of the bistable unit cell are studied for designing mechanical metamaterials resistant to repeated impacts.
Abstract In this work, multistable mechanical metamaterials with recoverable capabilities are designed for high energy absorption and resistance to repetitive impacts. Based on the known curved beam with energy dissipation characteristics, the shape memory alloys (SMAs) curved beam is added and optimized to achieve recoverability of the bi-layer beam structure. To simultaneously achieve bistable characteristics and recoverability in the designed metamaterial, the optimization model is formulated to maximize the energy absorption capacity of the structure while constraining the peak and valley forces. To solve this complex and highly nonlinear topological optimization problem with stringent constraints, the topological design of the SMAs layer is represented using a limited number of design variables along with the material-field series expansion strategy, and the optimization problem is subsequently solved using a non-gradient-based optimization algorithm. Finite element simulation results demonstrated that the optimized design possesses a substantial capacity for energy absorption. Additionally, the design structure can recover to its initial state from buckling induced by the initial load by regulating the external temperature. Different multistable metamaterials, including those designed to prevent repetitive impacts, have been further developed based on the designed recoverable high-energy-absorbing bistable unit cells, utilizing combinations of varying energy absorption capacities.
Graphical abstract Display Omitted
Topology optimization design of recoverable bistable structures for energy absorption with embedded shape memory alloys
https://orcid.org/0009-0004-5585-3542
https://orcid.org/0000-0001-9296-0583
Highlights A bi-layer curved beam structure incorporating SMAs layer is designed to achieve high-energy absorption and controllable phase transition properties. Non-gradient topology optimization of the SMAs distribution is proposed to enhance energy absorption capacity. The influence of bi-layer curved beam thickness on design outcomes is analyzed while emphasizing the critical roles of SMAs and nylon layers. The stacking strategies of the bistable unit cell are studied for designing mechanical metamaterials resistant to repeated impacts.
Abstract In this work, multistable mechanical metamaterials with recoverable capabilities are designed for high energy absorption and resistance to repetitive impacts. Based on the known curved beam with energy dissipation characteristics, the shape memory alloys (SMAs) curved beam is added and optimized to achieve recoverability of the bi-layer beam structure. To simultaneously achieve bistable characteristics and recoverability in the designed metamaterial, the optimization model is formulated to maximize the energy absorption capacity of the structure while constraining the peak and valley forces. To solve this complex and highly nonlinear topological optimization problem with stringent constraints, the topological design of the SMAs layer is represented using a limited number of design variables along with the material-field series expansion strategy, and the optimization problem is subsequently solved using a non-gradient-based optimization algorithm. Finite element simulation results demonstrated that the optimized design possesses a substantial capacity for energy absorption. Additionally, the design structure can recover to its initial state from buckling induced by the initial load by regulating the external temperature. Different multistable metamaterials, including those designed to prevent repetitive impacts, have been further developed based on the designed recoverable high-energy-absorbing bistable unit cells, utilizing combinations of varying energy absorption capacities.
Graphical abstract Display Omitted
Topology optimization design of recoverable bistable structures for energy absorption with embedded shape memory alloys
https://orcid.org/0009-0004-5585-3542
https://orcid.org/0000-0001-9296-0583
Highlights A bi-layer curved beam structure incorporating SMAs layer is designed to achieve high-energy absorption and controllable phase transition properties. Non-gradient topology optimization of the SMAs distribution is proposed to enhance energy absorption capacity. The influence of bi-layer curved beam thickness on design outcomes is analyzed while emphasizing the critical roles of SMAs and nylon layers. The stacking strategies of the bistable unit cell are studied for designing mechanical metamaterials resistant to repeated impacts.
Abstract In this work, multistable mechanical metamaterials with recoverable capabilities are designed for high energy absorption and resistance to repetitive impacts. Based on the known curved beam with energy dissipation characteristics, the shape memory alloys (SMAs) curved beam is added and optimized to achieve recoverability of the bi-layer beam structure. To simultaneously achieve bistable characteristics and recoverability in the designed metamaterial, the optimization model is formulated to maximize the energy absorption capacity of the structure while constraining the peak and valley forces. To solve this complex and highly nonlinear topological optimization problem with stringent constraints, the topological design of the SMAs layer is represented using a limited number of design variables along with the material-field series expansion strategy, and the optimization problem is subsequently solved using a non-gradient-based optimization algorithm. Finite element simulation results demonstrated that the optimized design possesses a substantial capacity for energy absorption. Additionally, the design structure can recover to its initial state from buckling induced by the initial load by regulating the external temperature. Different multistable metamaterials, including those designed to prevent repetitive impacts, have been further developed based on the designed recoverable high-energy-absorbing bistable unit cells, utilizing combinations of varying energy absorption capacities.
Graphical abstract Display Omitted
Topology optimization design of recoverable bistable structures for energy absorption with embedded shape memory alloys
Liang, Kuan (author) / Zhou, Shaojie (author) / Luo, Yangjun (author) / Zhang, Xiaopeng (author) / Kang, Zhan (author)
Thin-Walled Structures ; 198
2024-02-26
Article (Journal)
Electronic Resource
English
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