Journal of Bionic Engineering ›› 2023, Vol. 20 ›› Issue (6): 2786-2796.doi: 10.1007/s42235-023-00403-4

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A Stiffness-Tunable Composite with Wide Versatility and Applicability Based on Low-Melting-Point Alloys

Jiawei Xiong1; Bo Sun1; Chunbao Liu1,2; Konghua Yang1; Yuchao Luo1; Yunhong Liang2,3; Zhiwu Han2; Lei Ren4; Zhaohua Lin1 #br#   

  1. 1 School of Mechanical and Aerospace Engineering, JilinUniversity, Changchun 130022, China 2 Key Laboratory of Bionic Engineering, Ministryof Education, Jilin University, Changchun 130022, China 3 Liaoning Academy of Materials, Shenyang 110167, China 4 Department of Mechanical, Aerospace and CivilEngineering, University of Manchester, Manchester M139PL, UK
  • 出版日期:2023-10-16 发布日期:2023-11-20
  • 通讯作者: Chunbao Liu E-mail:liuchunbao@jlu.edu.cn
  • 作者简介:Jiawei Xiong1; Bo Sun1; Chunbao Liu1,2; Konghua Yang1; Yuchao Luo1; Yunhong Liang2,3; Zhiwu Han2; Lei Ren4; Zhaohua Lin1

A Stiffness-Tunable Composite with Wide Versatility and Applicability Based on Low-Melting-Point Alloys

Jiawei Xiong1; Bo Sun1; Chunbao Liu1,2; Konghua Yang1; Yuchao Luo1; Yunhong Liang2,3; Zhiwu Han2; Lei Ren4; Zhaohua Lin1 #br#   

  1. School of Mechanical and Aerospace Engineering, JilinUniversity, Changchun 130022, China Key Laboratory of Bionic Engineering, Ministryof Education, Jilin University, Changchun 130022, China Liaoning Academy of Materials, Shenyang 110167, China Department of Mechanical, Aerospace and CivilEngineering, University of Manchester, Manchester M139PL, UK
  • Online:2023-10-16 Published:2023-11-20
  • Contact: Chunbao Liu E-mail:liuchunbao@jlu.edu.cn
  • About author:Jiawei Xiong1; Bo Sun1; Chunbao Liu1,2; Konghua Yang1; Yuchao Luo1; Yunhong Liang2,3; Zhiwu Han2; Lei Ren4; Zhaohua Lin1

摘要: Flexible materials are essential in bionic fields such as soft robots. However, the lack of stiffness limits the mechanical performance of soft robots and makes them difficult to develop in many extreme working conditions, such as lifting and excavation operations. To address this issue, we prepared a stiffness-tunable composite by dispersing low-melting-point alloy into thermosetting epoxy resin. A dramatic and rapid change in stiffness was achieved by changing the state of matter at lower temperatures, and accurate control of the composite modulus was achieved by controlling the temperature. When the alloy content is at 30vol%, the tensile modulus changes 41.6 times, while the compressive modulus changes 58.9 times. By applying the composite to a flexible actuator, the initial stiffness of the actuator was improved by 124 times, reaching 332 mN/mm. In addition, the use of stiffness-tunable materials in the wheel allowed for timely changes in the grounding area to improve friction. These flexible materials with manageable mechanical properties have wide applicability in fields including bionics, robotics, and sensing. Our findings provide a new approach to designing and developing flexible materials with improved stiffness and controllability

Abstract: Flexible materials are essential in bionic fields such as soft robots. However, the lack of stiffness limits the mechanical performance of soft robots and makes them difficult to develop in many extreme working conditions, such as lifting and excavation operations. To address this issue, we prepared a stiffness-tunable composite by dispersing low-melting-point alloy into thermosetting epoxy resin. A dramatic and rapid change in stiffness was achieved by changing the state of matter at lower temperatures, and accurate control of the composite modulus was achieved by controlling the temperature. When the alloy content is at 30vol%, the tensile modulus changes 41.6 times, while the compressive modulus changes 58.9 times. By applying the composite to a flexible actuator, the initial stiffness of the actuator was improved by 124 times, reaching 332 mN/mm. In addition, the use of stiffness-tunable materials in the wheel allowed for timely changes in the grounding area to improve friction. These flexible materials with manageable mechanical properties have wide applicability in fields including bionics, robotics, and sensing. Our findings provide a new approach to designing and developing flexible materials with improved stiffness and controllability