Elastic–Plastic Behaviors of Vertically Aligned Carbon Nanotube Arrays by Large-Displacement Indentation Test
This chapter describes the large-displacement indentation test method for examining elastic–plastic behaviors of vertically aligned carbon nanotube arrays (VA-CNTs). The principle of this test is explained by using a cavity expansion model. The experiments have been performed on VA-CNTs synthesized by the chemical vapor deposition (CVD) method. Under a cylindrical, flat indenter, the VA-CNTs exhibit two distinct deformation stages: a short, elastic deformation at small displacement and a plateau-like, plastic deformation at large displacement. The critical indentation stress, a measure of yield stress or collapsing stress of the VA-CNT arrays, has been obtained. The deformation mechanism of the VA-CNTs at large displacement is revealed with scanning electronic microscope (SEM) images of the deformed VA-CNTs and finite element simulations.
KeywordsLarge Displacement Solid Polymer Equivalent Plastic Strain Plastic Collapse Indentation Stress
- ABAQUS (2010) ABAQUS Theory’ manual. Simulia Inc., PawtucketGoogle Scholar
- Lo JCW, Lu YC, Shinozaki DM (2005) Kink band formation during microindentation of oriented polyethylene. Mater Sci Eng A 396(15):77–86Google Scholar
- Mesarovic SD, Fleck NA (1987) Spherical indentation of elastic-plastic solids. Proc R Soc Lond 455:2707–2728Google Scholar
- Riccardi B, Montanari R (2004) Indentation of metals by a flat-ended cylindrical punch. Mater Sci Eng A 381(1–2):281–291Google Scholar