The Effect of Material Stiffness and Chamber Volume on the Bending Angle and Contact Force Performance of Bending Soft Pneumatic Actuators

Year 2025, Volume: 29 Issue: 6, 726 - 734, 23.12.2025

Muhammed Ömer İbiş , Seyda Emir Şimşir , Sedat İriç , Sena Özel , Akın Oğuz Kaptı

https://doi.org/10.16984/saufenbilder.1683731

Abstract

Bending Soft Pneumatic Actuators (BSPAs) have significant potential in areas such as wearable systems for medical rehabilitation and industrial robotic grippers, due to their flexibility and force generation capabilities. This study investigates the effect of chamber volume and silicone material stiffness on the bending angle and contact force production performance of BSPAs. Tests were conducted for three different experimental groups using a specially designed test setup. The results revealed that material stiffness plays a crucial role in determining both the bending angle and contact force production. While chamber volume had a limited impact on the bending angle, it was found to have a significant effect on contact force production. Additionally, it was observed that the influence of material stiffness on contact force production was more pronounced than that of chamber volume.

Keywords

Soft Pneumatic Actuators , Bending angle , Contact force , Material stiffness , Chamber volume

Supporting Institution

The Scientific and Technological Research Council of Turkey (TUBITAK)

Project Number

TUBITAK Project ID: 122M619

Thanks

The authors would like to thank The Scientific and Technological Research Council of Turkey (TUBITAK) (Project ID: 122M619) for financial support to this study.

References

• C. P. Chou, B. Hannoford, “Measurement and modeling of McKibben pneumatic artificial muscles,” IEEE Transactions on Robotics and Automation, vol. 12, no. 1, pp. 90-102, 1996.
• B. Tondu, P. Lopez, “Modeling and control of McKibben artificial muscle robot actuators,” IEEE Control Systems Magazine, vol. 20, no. 2, pp. 15-38, 2000.
• F. Daerden, D. Lefeber, “Pneumatic artificial muscles: Actuators for robotics and automation,” Robotics and Autonomous Systems, vol. 47, no. 1, pp. 11-21, 2002.
• H. Al-Fahaam, S. Davis, S. Nefti-Meziani, “The design and mathematical modelling of novel extensor bending pneumatic artificial muscles (EBPAMs) for soft exoskeletons,” Robotics and Autonomous Systems, vol. 99, pp. 63-74, 2018.
• P. Polygerinos, S. Lyne, Z. Wang, L. F. Nicolini, B. Mosadegh, G. M. Whitesides, et al., “Towards a soft pneumatic glove for hand rehabilitation,” In IEEE/RSJ International Conference on Intelligent Robots and Systems, Tokyo, Japan, 2013, pp. 1512-1517.
• G. Alici, T. Canty, R. Mutlu, W. Hu, V. Sencadas, “Modeling and experimental evaluation of bending behavior of soft pneumatic actuators made of discrete actuation chambers,” Soft Robotics, vol. 5, no. 1, pp. 24-35, 2018.
• Y. Hao, Z. Y. Gong, Z. X. Xie, S. Y. Guan, X. B. Yang, T. M. Wang, et al., “A soft bionic gripper with variable effective length,” Journal of Bionic Engineering, vol. 15, pp. 220-235, 2018.
• F. Conolly, P. Polygerinos, C. J. Walsh, K. Bertoldi, “Mechanical programming of soft actuators by varying fiber angle,” Soft Robotics, vol. 2, no. 1, pp. 26-32, 2015.
• D. Yang, B. Mosadegh, A. Ainla, B. Lee, F. Khashai, Z. Suo, et al., “Buckling of elastomeric beams enables actuation of soft machines,” Advanced Materials, vol. 27, pp. 6323-6327, 2015.
• W. Xiao, X. Du, W. Chen, G. Yang, D. Hu, X. Han, “Cooperative collapse of helical structure enables the actuation of twisting pneumatic artificial muscle,” International Journal of Mechanical Sciences, vol. 201, 106483, 2021.
• Y. Sun, H. J. Yap, X. Liang, J. Guo, P. Qi, M. H. Ang, et al., “Stiffness customization and patterning for property modulation of silicone-based soft pneumatic actuators,” Soft Robotics, vol. 4, no. 3, pp. 251-260, 2017.
• J. Wang, Y. Fei, W. Pang, “Design, modeling, and testing of a soft pneumatic glove with segmented pneunets bending actuators,” IEEE/ASME Transactions on Mechatronics, vol. 24, no. 3, pp. 990-1001, 2019.
• H. K. Yap, H. Y. Ng, C. Yeow, “High-force soft printable pneumatics for soft robotic applications,” Soft Robotics, vol. 3, no. 3, pp. 144-158, 2016.
• W. Hu, G. Alici, “Bioinspired three-dimensional-printed helical soft pneumatic actuators and their characterization,” Soft Robotics, vol. 7, no. 3, pp. 267-282, 2020.
• R. Natividad, M. D. Rosarino, P. C. Y. Chen, C. Yeow, “A reconfigurable pneumatic bending actuator with replaceable inflation modules,” Soft Robotics, vol. 5, no. 3, pp. 304-317, 2018.
• H. Li, J. Yao, P. Zhou, X. Chen, Y. Xu, Y. Zhao, “High-force soft pneumatic actuators based on novel casting method for robotic applications,” Sensors and Actuators A: Physical, vol. 306, 111957, 2020.
• W. Hu, R. Mutlu, W. Li, G. Alici, “A structural optimisation method for a soft pneumatic actuator”. Robotics, vol. 7, no. 2, 24, 2018.
• Y. Sun, Y. S. Song, J. Paik, “Characterization of silicone rubber based soft pneumatic actuators,” in IEEE/RSJ International Conference on Intelligent [Robots and Systems, Tokyo, Japan, 2013, pp. 4446-4453.
• B. Mosadegh, P. Polygerinos, C. Keplinger, S. Wennstedt, R. F. Shepherd, U. Gupta, et al., “Pneumatic networks for soft robotics that actuate rapidly,” Advanced Functional Materials, vol. 24, pp. 2163-2170, 2014.
• F. Yang, Q. Ruan, Y. Man, Z. Xie, H. Yue, B. Li, et al., "Design and optimize of a novel segmented soft pneumatic actuator," IEEE Access, vol. 8, pp. 122304-122313, 2020.
• M. Ö. İbiş, S. E., Şimşir, S. İriç, A. O. Kapti, M. Ç. Kutlu, “Effect of wall thickness on the performance of bending pneumatic artificial muscle,” in International Marmara Science and Social Sciences Congress, Kocaeli, Türkiye, 2024, pp. 202-212.
• W. Xiao, D. Hu, W. Chen, G. Yang, X. Han, “Design, characterization and optimization of multi-directional bending pneumatic artificial muscles,” Bionic Engineering, vol. 18, pp. 1358-1368, 2021.
• S. Nikolov, V. Kotev, K. Kostadinov, F. Wang, C. Liang, Y. Tian, “Model-based design optimization of soft fiber-reinforced bending actuators,” in IEEE International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale (3M-NANO), Chongqing, China, 2016.
• N. Gariya, P. Kumar, T. Singh, “Experimental study on a bending type soft pneumatic actuator for minimizing the ballooning using chamber-reinforcement,” Heliyon, vol. 9, p. e14898, 2023.