The design of a compliant shape-preserving ring. (September 2020)

• Record Type: Journal Article
• Authors: Schreurs, K.W.A.; Radaelli, G.; Alijani, F.
• Is Part Of: Mechanism and machine theory. Volume 151(2020)
• Publication Date: 2020-09
• Subjects: Compliant mechanisms -- Shape-preservation -- Flexures -- Shape optimization -- Dilational mechanisms; Machine theory -- Periodicals; Machinery -- Periodicals; Machines -- Périodiques; Génie mécanique -- Périodiques; Machine theory; Machinery; Periodicals; 621.81
• DOI: 10.1016/j.mechmachtheory.2020.103918
• Languages: English
• ISSNs: 0094-114X

Abstract

Highlights: A compliant shape preserving ring is designed based on Hoberman's mechanism. A novel compliant scissor mechanism is proposed as building block for the ring. Shape preservation and range of motion is increased via shape optimization. A prototype demonstrates a shape preservation of 88% for up to a 20% expansion. Abstract: Compliant shape-preserving mechanisms fill a small niche within the established research field of compliant mechanisms. To date no report exists on a compliant shape-preserving ring, even though these mechanisms can give rise to a multitude of practical applications. They can essentially act as novel sealing mechanisms, compliant grippers or find use in medical applications. This paper presents three compliant shape-preserving rings that maintain their circular shape up to 99% for their full range-of-motion. The best design can expand in diameter by ≈ 45%. A prototype of a compliant shape-preserving ring was constructed from PETG (Polyethylene Terephtalate Glycol-modified) using fused-filament-fabrication. The experimental evaluation of this prototype showed a good agreement with the numerical model describing the design. A novel compliant scissor mechanism was obtained in the design process and this mechanism can prove useful in the design of other compliant shape-preserving mechanisms.