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Published on: January 30, 2012
Fatigue of insect cuticle
Jan-Henning Dirks1, Eoin Parle, David Taylor
1Trinity Centre for Bioengineering, Department of Mechanical and Manufacturing Engineering, Trinity College, Dublin 2, Ireland. jan-henning.dirks@web.de
The Journal of Experimental Biology
|February 9, 2013
Summary
Insect cuticle fatigue properties were studied for the first time. Locust legs withstand higher stress than wings before fatigue failure, suggesting evolutionary optimization for durability.
Area of Science:
- Biomechanics
- Materials Science
- Evolutionary Biology
Background:
- Insect exoskeletons, composed of cuticle, are subject to repeated mechanical stress.
- The fatigue properties of insect cuticle, crucial for in vivo durability, remain largely unknown.
- Fatigue failure is a significant factor limiting the lifespan of biological structures.
Purpose of the Study:
- To experimentally determine the fatigue properties of insect cuticle.
- To compare the fatigue resistance of locust hind legs (tibiae) and hind wings.
- To investigate the relationship between applied stress, cycles to failure, and material structure.
Main Methods:
- Force-controlled cyclic loading was applied to locust tibiae and wings.
- The number of cycles to failure was recorded as a function of applied cyclic stress.
- Failure modes of the tibiae were analyzed.
Main Results:
- Locust wings exhibited a wide fatigue range, failing at 46% of ultimate tensile strength (UTS) after 100,000 cycles.
- Locust legs sustained 76% of UTS for 100,000 cycles, demonstrating significantly higher fatigue resistance.
- Tibiae failure occurred through tensile propagation or compressive buckling, indicating dual-mode resistance.
Conclusions:
- Locust legs and wings display distinct fatigue properties despite being made of cuticle.
- Differences in cuticle composition and structure likely explain the varied fatigue performance.
- The tibia's resistance to both tensile and compressive failure modes suggests evolutionary optimization for mechanical demands.
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