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Stiffness of desiccating insect wings
T E Mengesha1, R R Vallance, R Mittal
1Department of Mechanical Engineering, The George Washington University, Washington, DC 20052, USA.
Bioinspiration & Biomimetics
|December 17, 2010
Summary
Insect wing stiffness increases as wings desiccate, losing mass over time. This study quantifies the rate of stiffness change in desiccating butterfly wings, aiding experimental design and data interpretation.
Area of Science:
- Biomechanics
- Entomology
- Experimental Physics
Background:
- Insect wing stiffness is crucial for flight mechanics.
- Experimental measurements are standard but affected by wing desiccation.
- Desiccation-induced stiffness changes are known but not comprehensively quantified.
Purpose of the Study:
- To experimentally analyze the rate of mass and stiffness change in desiccating insect wings.
- To provide data aiding the planning and interpretation of insect wing biomechanics experiments.
Main Methods:
- Simultaneous measurement of mass and stiffness of Painted Lady butterfly (Vanessa cardui) forewings.
- Measurements taken every 10 minutes over 24 hours for five butterflies.
- Longer-term experiment conducted over 1 week for a single butterfly.
Main Results:
- Over 24 hours, wing mass declined exponentially by 21.1% (time constant 9.8 h).
- Wing stiffness increased linearly by 46.2% at a rate of 23.4 µN mm⁻¹ h⁻¹.
- Over 1 week, mass declined 52.2% (time constant 30.2 h) to a steady state; stiffness increased 90.7% to a steady state.
Conclusions:
- Quantifies the exponential mass loss and linear stiffness increase during insect wing desiccation.
- Provides critical data for understanding how desiccation affects insect wing biomechanics.
- Essential for accurate experimental design and data interpretation in insect flight studies.
