کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
823065 | 906822 | 2006 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Role of atomic scale interfaces in the compressive behavior of carbon nanotubes in composites Role of atomic scale interfaces in the compressive behavior of carbon nanotubes in composites](/preview/png/823065.png)
Carbon nanotubes (CNT) are potentially promising fibers for ultra high strength composites. In order to fully harness the outstanding mechanical properties of carbon nanotubes as fiber reinforcements, it is essential to understand the nature of load transfer between fiber and matrix under various types of loading conditions that include tension, compression, torsion and a combination thereof. In this paper, we study the compressive behavior (buckling and post-buckling) of carbon nanotubes in the neat form, when they are embedded in polyethylene matrix and with interface chemical modifications using molecular dynamics simulations based on Tersoff–Brenner potential. It is observed that the critical load for buckling increases only very marginally for nanotubes embedded in polythene matrix (with non-bonded interface) compared to neat CNTs. When CNTs are chemically bonded to the matrix, the compressive behavior occurs in two phases; pre- and post-buckling phases. First, the critical stress for buckling is found to reduce because the change in chemical bonding induces deviation from perfect cylindrical structure. In the post-buckling phase, however, the nanotubes behave similar to short fibers and deform by crushing. The results are compared with continuum solutions, wherever applicable. It is shown that the continuum solutions should be applied carefully whenever the effect of nanoscale interfaces becomes a factor.
Journal: Composites Science and Technology - Volume 66, Issue 13, October 2006, Pages 2030–2038