Recent Advances in Compliant Mechanisms

A special issue of Machines (ISSN 2075-1702). This special issue belongs to the section "Machine Design and Theory".

Deadline for manuscript submissions: 30 June 2026 | Viewed by 1453

Special Issue Editor


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Guest Editor
Mechanical Engineering Deprtment, Kennesaw State University, Marietta, GA, USA
Interests: compliant mechanisms; soft robots; modeling and control; engineering education

Special Issue Information

Dear Colleagues,

Compliant mechanisms utilize the elastic properties of materials to create desired output motion and offer significant advantages in simplifying design, improving efficiency, and enhancing accuracy over traditionally designed rigid-body mechanisms. This Special Issue is dedicated to exploring the latest developments in the design, application, modeling, and manufacturing of complex compliant mechanisms. Their applications span a wide range, including, but not limited to, energy harvesting, upper and lower body exoskeletons, biomimetic locomotive robots, soft robots, high-speed and precision positioning stage-based mechanisms, lamina emergent and folding mechanisms, and open-chain and closed-chain compliant mechanisms.

The Special Issue highlights advancements in both the application and modeling of compliant mechanisms, from kinetostatic modeling of small and large deflecting mechanisms to the derivation of dynamic models that capture their nonlinear behavior under complex loading conditions. Additionally, there have been substantial improvements in the manufacturing techniques and material innovations that enhance their overall performance and enable new practical implementations across disciplines.

We encourage researchers and practitioners in the field to contribute their findings to this Special Issue and present the outcomes of their studies on the design, modeling, application, and manufacturing of compliant mechanisms. This collection will highlight their vast potential across emerging applications and provide valuable insights into future advancements in the field.

Dr. Ayse Tekes
Guest Editor

Manuscript Submission Information

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Keywords

  • compliant mechanisms
  • soft robots
  • flexible machines
  • lamina emergent mechanisms
  • foldable mechanisms
  • mechanism synthesis
  • nonlinear modeling

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Published Papers (1 paper)

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Research

26 pages, 8254 KB  
Article
Reconfigurable Compliant Joints (RCJs) for Functional Biomimicry in Assistive Devices and Wearable Robotic Systems
by Vanessa Young, Connor Talley, Sabrina Scarpinato, Gregory Sawicki and Ayse Tekes
Machines 2026, 14(4), 427; https://doi.org/10.3390/machines14040427 - 11 Apr 2026
Viewed by 466
Abstract
Compliant mechanisms have contributed to many advances in soft robotics, and there is strong motivation to translate these ideas to assistive devices where adaptive motion at the human interface is required. This work presents novel reconfigurable compliant joints (RCJs) as a parameterized joint [...] Read more.
Compliant mechanisms have contributed to many advances in soft robotics, and there is strong motivation to translate these ideas to assistive devices where adaptive motion at the human interface is required. This work presents novel reconfigurable compliant joints (RCJs) as a parameterized joint element for functional biomimicry in lower-extremity joints for prosthetic knees and ankle–foot orthoses, with concepts that extend to other limb joints. The RCJ uses a rigid hub and outer ring joined by an array of flexible links with centerlines defined by cubic Bézier curves. Link shapes are organized into four Bézier classes (A–D), with base types using 10, 12, or 14 uniformly distributed link slots and variants generated by modifying active-link count and distribution, forming a structured morphology space of 12 configurations for machine design. Dual-extrusion 3D-printed prototypes are characterized by a custom testing apparatus using a 2.2 kN load cell at 25 mm/s over a 0–90° rotation range across six recorded load cycles to measure torque–angle curves and stiffness under large deformations. Angle-dependent stiffness is evaluated over three fixed intervals (0–30°, 30–60°, and 60–90°) to quantify multi-stage behavior. A 2-dimensional corotational frame model and a Simscape Multibody model, including a rolling-contact knee configuration, use the same parameterization to relate geometry, nonlinear mechanics, and system-level motion. Experiments and simulations show multi-stage torque–angle profiles and predictable stiffness modulation across all configurations, with both magnitude and transition angle tunable through Bézier class and active-link distribution, positioning the RCJ as a CAD/CAE-compatible joint architecture for assistive devices or wearable robotic systems and a basis for advancing functional biomimicry in compliant mechanism design. Full article
(This article belongs to the Special Issue Recent Advances in Compliant Mechanisms)
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