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Biomechanical Analysis of Woodpecker Response During Pecking Using a Two-Dimensional Computational Model
Shailesh Ganpule1, Sunil Sutar1, Kaustaubh Shinde1
1Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, India.
Frontiers in Bioengineering and Biotechnology
|August 9, 2020
Summary
Woodpecker biomimicry reveals insights into mitigating traumatic brain injury (TBI). Despite similar head accelerations, woodpecker brains experience significantly lower strains and stresses than human brains, offering potential for impact protection designs.
Area of Science:
- Biomechanics
- Neuroscience
- Biomimicry
Background:
- Traumatic brain injury (TBI) and chronic traumatic encephalopathy (CTE) pose significant health risks.
- Impact mitigation strategies are crucial for reducing TBI and CTE burden.
- Woodpecker head mechanics offer a potential model for impact protection.
Purpose of the Study:
- To investigate and compare the biomechanical responses of woodpecker and human head models during pecking.
- To analyze the strain and stress experienced by the brain under impact conditions.
- To develop an acceleration scaling relationship between woodpecker and human head responses.
Main Methods:
- Developed 2D head models of woodpeckers and humans from medical images.
- Assigned material properties from existing literature.
- Simulated head kinematics during pecking for both models.
- Analyzed resulting biomechanical responses, including strain and stress.
Main Results:
- Woodpecker brains experienced approximately six times lower strains and stresses than human brains for the same input acceleration.
- Peak rotational acceleration in woodpeckers (7,057 rad/s²) is comparable to human TBI thresholds.
- Increased pecking frequency doubled brain strains and stresses; a 90 ms dwell period aided stress relaxation in woodpeckers.
Conclusions:
- Woodpecker head size significantly reduces brain strain and stress compared to humans.
- Both woodpecker and human brains exceeded axonal injury thresholds at peak simulated accelerations.
- An acceleration scaling relationship was developed, indicating size is a key factor in impact response.
