Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8160406 | Physica B: Condensed Matter | 2018 | 41 Pages |
Abstract
The surface of pulled out fiber from the cementitious matrix reveals some scratches. It can be considered that the fresh cement paste can penetrate into the pores of hydrophilic poly (vinyl alcohol) (PVA) fibers which is converted to some hard teeth in the pores of the fiber after cement hydration. The hard teeth scratch the fiber surface during pull out which introduce energy consuming and slip hardening. In the current study, some nano-scratches with the length of 3â¯Î¼m and the depths of 50, 150 and 250â¯nm are produced on two different PVA fibers the required force at different scratching rates are evaluated. The nano-scratches are made by an innovative inverse fly-mode technique in atomic force microscopy. The results indicate that the required force increases as the hardened teeth is further scratching the fiber which causes the strain hardening. However, the fibers showing significant roughness and high resistance against scratch fail during fiber pull out which deteriorates the strain hardening.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Mohamad Ali Etminani, Farhad Sharif,