Being thin-skinned can still reduce damage from dynamic puncture

Area of Science:

• Biomechanics
• Materials Science
• Zoology

Background:

• The integumentary system provides defense against external forces through evolved layered structures like skin and scales.
• Previous research focused on low-rate mechanical defense, leaving dynamic puncture response underexplored.
• Understanding dynamic puncture is crucial for biological defense mechanisms.

Purpose of the Study:

• To investigate the mechanics of dynamic puncture in layered biological and synthetic tissues.
• To determine the role of interlayer properties in damage resistance during dynamic puncture.
• To compare the damage resistance of natural skin with synthetic tissue simulants.

Main Methods:

• Development of a novel experimental framework for dynamic puncture testing.
• Utilizing bilayer composite materials mimicking tissue properties.
• Testing both synthetic and natural skin tissues under dynamic puncture conditions.

Main Results:

• A thin outer skin layer significantly reduces the extent of dynamic puncture damage.
• Interlayer properties govern damage resistance through puncture energetics.
• Damage resistance decreases at higher puncture rates in silicone simulants due to rate-dependent effects.
• Natural skin tissues demonstrate superior damage reduction compared to synthetic materials.

Conclusions:

• Layered integumentary structures, particularly the outer skin layer, are highly effective at mitigating dynamic puncture damage.
• Interlayer properties and material behavior significantly influence puncture resistance.
• Natural skin possesses unique biomechanical properties for enhanced damage reduction, providing a basis for bio-inspired engineering applications.