Publication:
Effects of Carbon Nanomaterial Reinforcement on Composite Joints Under Cyclic and Impact Loading

Loading...
Thumbnail Image
Authors
Tan, Meng Hwee
Subjects
Carbon nanotubes
carbon nanofibers
composite joints
cyclic loading
impact loading
Advisors
Kwon, Young W.
Date of Issue
2012-03
Date
Mar-12
Publisher
Monterey, California. Naval Postgraduate School
Language
Abstract
This study investigated the influence of Multi-Walled Carbon Nanotubes (MWCNTs) and Carbon Nanofibers (CNFs) reinforcement on the behavior of Carbon Fiber Reinforced Polymer (CFRP) joint interface under cyclic and impact loading. Test coupons with pre-cracks were fabricated via Vacuum Assisted Resin Transfer Molding (VARTM) technique with 7.5g/m2 of MWCNTs or CNFs dispersed at the joint interface ahead of the crack tip. The test coupons were loaded in 3-point bending at 2Hz and 10Hz frequencies for the cyclic loading test. The CNTs and CNFs-reinforced samples displayed higher stiffness and had significantly shorter crack propagation lengths under the same loading cycles. Resistance to crack propagation was evident in the reinforced samples as observed using an optical microscope. Similar sets of reinforced as well as non-reinforced samples were subjected to low energy impact tests and their dynamic responses and failures were also compared. CNTs-reinforcement samples experienced failure at higher impact force as compared to non-reinforced samples. However, further testing was recommended to establish the effects of CNFs reinforcement under impact loading. The test results suggested that proper reinforcement of the joint interface using carbon nanomaterial can significantly delay the crack growth, resulting in improvement of composite structural integrity and its service life.
Type
Thesis
Description
Series/Report No
Department
Mechanical Engineering
Other Units
Identifiers
NPS Report Number
Sponsors
Funder
Format
Citation
Distribution Statement
Rights
Collections