Finite Element Analysis

Finney, Robert H.

doi:10.3139/9783446428713.009

Cited by 7 publications

(2 citation statements)

References 11 publications

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“…As a soft robotic gripper, the AVFT based on the bistable CFRP structure exhibits sufficient flexibility to adapt to the deformation of objects [ 10 , 33 ]. Fluidic elastomer actuators are one of the oldest but still widely used soft robot actuation technologies [ 34 ], with advantages such as easy fabrication, low cost, robustness, fast response time and easy implementation [ 35 , 36 ] compared to shape memory material actuation [ 37 , 38 , 39 , 40 , 41 ], magnetic actuation [ 42 , 43 ] and other actuation methods [ 44 , 45 , 46 ]. Soft pneumatic bending actuators are typically representative of pneumatic actuations, which achieve bending deformation via a flexible asymmetrical axial cross-section surrounding an inflatable void.…”

Section: Introductionmentioning

confidence: 99%

Design of a Bistable Artificial Venus Flytrap Actuated by Low Pressure with Larger Capture Range and Faster Responsiveness

2023

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The rapid closure of the Venus flytrap (Dionaea muscipula) can be completed within 0.1–0.5 s due to the bistability of hyperbolic leaves and the curvature change of midrib. Inspired by its bistable behavior, this paper presents a novel bioinspired pneumatic artificial Venus flytrap (AVFT), which can achieve a larger capture range and faster closure action at low working pressure and low energy consumption. Soft fiber-reinforced bending actuators are inflated to move artificial leaves and artificial midrib fabricated from bistable antisymmetric laminated carbon fiber-reinforced prepreg (CFRP) structures, and then the AVFT is rapidly closed. A two-parameter theoretical model is used to prove the bistability of the selected antisymmetric laminated CFRP structure, and analyze the factors affecting the curvature in the second stable state. Two physical quantities, critical trigger force and tip force, are introduced to associate the artificial leaf/midrib with the soft actuator. A dimension optimization framework for soft actuators is developed to reduce their working pressures. The results show that the closure range of the AVFT is extended to 180°, and the snap time is shortened to 52 ms by introducing the artificial midrib. The potential application of the AVFT for grasping objects is also shown. This research can provide a new paradigm for the study of biomimetic structures.

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Section: Introductionmentioning

confidence: 99%

Design of a Bistable Artificial Venus Flytrap Actuated by Low Pressure with Larger Capture Range and Faster Responsiveness

2023

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“…Over the last decade, a significant number of reviews and comparative studies on hyperelastic constitutive models has been published. The availability of these studies is due to the extensive choice in hyperelastic material models and recommendations 17,18,19 for their selection and application in FEA. To describe the elastic behaviour of rubber-like materials, numerous specific forms of strain–energy functions have been proposed in the literature so far.…”

Section: Introductionmentioning

confidence: 99%

CAE-Based application for identification and verification of hyperelastic parameters

Gorash

Comlekci

Hamilton

2015

Proceedings of the Institution of Mechanical Engineers, Part L:

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The main objective of this study is to develop a CAE-based application with a convenient GUI for identification and verification of material parameters for hyperelastic models available in the current release of the FE-code ANSYS Mechanical APDL. This Windows-application implements a 2-step procedure: 1) fitting of experimental stress-strain curves provided by user; 2) verification of obtained material parameters by the solution of a modified benchmark problem. The application, which was developed using Visual Basic .NET language, implements a two-way interaction with ANSYS as a single loop using the APDL-script as an input and text, graphical and video files as an output. With this application, 9 isotropic incompressible hyperelastic material models are compared by fitting them to the conventional Treloar's experimental dataset (1944) for a vulcanised rubber. The ranking of hyperelastic models is constructed according to the models efficiency, which is estimated using a fitting quality criterion. The models ranking is done based upon the complexity of their mathematical formulation and ability of accurately reproducing the test data. Recent hyperelastic models (Extended Tube and Response Function) are found more efficient compared to conventional ones. The verification is done by the comparison of an analytical solution to a FEA result for the benchmark problem of rubber cylinder under compression proposed by Lindley (1967). In the application, the classical formulation of the benchmark is improved mathematically to become valid for larger deformations. The wide applicability of the proposed 2-steps approach is confirmed using stress-strains curves for 7 different formulations of natural rubber and 7 different grades of synthetic rubbers.

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A mechanics model of hard-magnetic soft rod with deformable cross-section under three-dimensional large deformation

Liu

et al. 2023

International Journal of Solids and Structures

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Finite Element Analysis

Abstract: ject_Proposal_5-25-12.doc The objective of this master of engineering final project is to investigate and analyze the accuracy of Finite Element Analysis ... Robert D. Cook. Concepts and ...

Cited by 7 publications

References 11 publications

Design of a Bistable Artificial Venus Flytrap Actuated by Low Pressure with Larger Capture Range and Faster Responsiveness

Design of a Bistable Artificial Venus Flytrap Actuated by Low Pressure with Larger Capture Range and Faster Responsiveness

CAE-Based application for identification and verification of hyperelastic parameters

A mechanics model of hard-magnetic soft rod with deformable cross-section under three-dimensional large deformation

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