# Pinching simulation of the coconut crab considering the 3D shape and internal characteristics of the robust claw exoskeleton

https://mdr.nims.go.jp/datasets/4df8284a-418a-48a1-b1b4-c39af2aa8dde

## File

- [202509 T Inoue&M Iwai_Results in Engng Vol.27(2025)105723.pdf](https://mdr.nims.go.jp/filesets/43073e76-1e15-42f4-9072-9cf87005e9c3/download) ([Detail](https://mdr.nims.go.jp/filesets/43073e76-1e15-42f4-9072-9cf87005e9c3.md))

## Id

4df8284a-418a-48a1-b1b4-c39af2aa8dde

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-06-16T04:08:54.929032Z

## Updated at

2025-06-16T07:30:26.148043Z

## Published at

2025-06-16T07:21:55.637960Z

## Doi



## First published url

https://doi.org/10.1016/j.rineng.2025.105723

## Date published

2025-06-11

## Recorded date published

2025-9

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Pinching simulation of the coconut crab considering the 3D shape and internal
    characteristics of the robust claw exoskeleton
  title_type: original
  lang: en

## Description

- description: A pinching simulation of the coconut crab, Birgus latro, which has
    a pinching force 80 times its body mass, was performed to quantify the stress
    imposed on the claw fingers when such a large force is applied. Data on the three-dimensional
    (3D) shape and internal information (hard exocuticle layer and soft endocuticle
    layer) in the claw exoskeleton were obtained using microfocus X-ray computed tomography.
    From these data, a 3D model of the claw was reconstructed using image analysis
    software, and a pinching simulation was performed using finite element analysis.
    The pinching force (Rf) was calculated as the sum of the node reaction forces
    in the area that came into contact with the stainless rod while the movable finger
    rotated within the claw, and the von Mises stress, σmises, in the fixed and movable
    fingers during the rotation were shown. The results showed that the stress increased
    with the angle of rotation, and at an angle of rotation of 2.8° and a reaction
    force of 957 N, stresses of 1.8 GPa were generated in the fixed finger, 588 MPa
    in the movable finger, and 674 MPa in the rod. This scientific pinching simulation
    confirmed the exceptional strength of the coconut crab's claw.
  description_type: abstract
  lang: und

## Creator

- name: Tadanobu Inoue
  role: author
  orcid: https://orcid.org/0000-0002-7366-7688
- name: Michinori Iwai
  role: author

## Contact agent



## Publisher

organization: Elsevier BV

## Managing organization



## Keyword

- subject: Finite element analysis (FEA)
  schema: not_defined
- subject: Biomechanics
  schema: not_defined
- subject: Decapod crustacean
  schema: not_defined
- subject: Claw
  schema: not_defined
- subject: X-ray CT
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by-nc-nd/4.0/

## Other identifier(s)



## Data origin



## Embargo



## Journal

- title: Results in Engineering
  issn: '25901230'
  volume: '27'
  article_number: '105723'

## Conference



## Related item



## Funding

- identifier: JP21H04537
  funder_name: Japan Society for the Promotion of Science
- identifier: 0361243-A
  funder_name: Iketani Science and Technology Foundation

## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



## Structural feature for specimen



## Specific property for specimen



## Process for specimen treatment



## Computational method



## Energy level/transition state



## Software



## Custom property



## Fileset

- id: 43073e76-1e15-42f4-9072-9cf87005e9c3
  filename: 202509 T Inoue&M Iwai_Results in Engng Vol.27(2025)105723.pdf
  content_type: application/pdf
  size: 12496793
  md5: 457c529d138ab64c53f8d4fac4522848

## Thumbnail

fileset_id: 43073e76-1e15-42f4-9072-9cf87005e9c3
filename: 202509 T Inoue&M Iwai_Results in Engng Vol.27(2025)105723.pdf