Abstract

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.

Original languageEnglish (US)
Pages (from-to)206-211
Number of pages6
JournalMaterials Characterization
Volume118
DOIs
StatePublished - 2016

Fingerprint

Coleoptera
Nanoindentation
nanoindentation
microstructure
Microstructure
modulus of elasticity
hardness
Elastic moduli
Hardness
cavities
fruits
eggs
Fruits
stiffness
Stiffness
Tissue
Scanning electron microscopy
scanning electron microscopy

Keywords

  • Curculio longinasus
  • Hardness
  • Nanoindentation
  • Rostrum
  • Young's modulus

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Microstructure and nanoindentation of the rostrum of Curculio longinasus Chittenden, 1927 (Coleoptera : Curculionidae). / Singh, Sudhanshu S.; Jansen, Michael A.; Franz, Nico; Chawla, Nikhilesh.

In: Materials Characterization, Vol. 118, 2016, p. 206-211.

Research output: Contribution to journalArticle

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