Journal
MATERIALS CHARACTERIZATION
Volume 118, Issue -, Pages 206-211Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2016.05.022
Keywords
Curculio longinasus; Rostrum; Nanoindentation; Young's modulus; Hardness
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Funding
- Office of Naval Research (ONR) [N00014-10-1-0350]
- Division Of Environmental Biology
- Direct For Biological Sciences [1155984] Funding Source: National Science Foundation
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The rostrum is an extension of the cuticle of the head of weevils (Coleoptera: Curculionidae) and is often used to bore holes for oviposition (the process of laying eggs) into host plant tissue where larval development occurs. In members of the genus Curculio Linnaeus, 1758, the rostrum is long, slender, and strongly curved, but is nevertheless used to excavate straight bore-holes in the fruit of various host plants, through significant deformation of this structure. In this study, scanning electron microscopy (SEM) was used to examine the rostrum of Curculio longinasus Chittenden, 1927, leading to a microstructural model that describes its deformation behavior. Specifically, we used the continuous stiffness measurement (CSM) technique in nanoindentation to measure the Young's modulus and hardness of rostrum. The values of Young's modulus and hardness for the endocuticle were measured to be 8.91 +/- 0.93 GPa and 558 +/- 60 MPa, respectively. These results are critical for generating accurate finite element models of the head's mechanical behavior while it undergoes deformation. (C) 2016 Elsevier Inc. All rights reserved.
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