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From Zero-Stiffness to Neutral Stability Using Stress Relaxation

Conference Paper (2025)
Author(s)

Matthias Blaakman (Student TU Delft)

G. Radaelli (TU Delft - Mechanical Engineering)

Research Group
Mechatronic Systems Design
DOI related publication
https://doi.org/10.1007/978-3-031-95489-4_8 Final published version
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Publication Year
2025
Language
English
Research Group
Mechatronic Systems Design
Bibliographical Note
Green Open Access added to TU Delft Institutional Repository as part of the Taverne amendment. More information about this copyright law amendment can be found at https://www.openaccess.nl. Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.
Pages (from-to)
87-97
Publisher
Springer
ISBN (print)
978-3-031-95488-7
ISBN (electronic)
978-3-031-95489-4
Event
13th CCToMM Symposium on Mechanisms, Machines, and Mechatronics, CCToMM M3 2025 (2025-06-19 - 2025-06-20), Ottawa, Canada
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43
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Abstract

This paper presents a novel prestressing method for polymeric compliant zero-stiffness mechanisms to obtain neutral stability. The method utilizes stress relaxation as an actor for imprinting a permanent elevated internal stress state. The method in question does not require a complex mechanical setup for application of the prestress. An existing zero-torsional stiffness mechanism is presented as a case study to demonstrate the working principle. Simulations have been performed and experimentally validated to present how stress relaxation can induce neutrally stable behavior in zero-stiffness compliant mechanisms. A sensitivity analysis is performed for the relaxation time to see its influence on the shift of the moment-angular deflection curve.

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