Indentation-Flexure and Low-Velocity Impact Damage in Graphite/Epoxy Laminates

By: Nasa, National Aeronautics and Space Adm

Static indentation and low velocity impact tests were performed on quasi-isotropic and cross ply graphite/epoxy composite laminates. The load deflection relations in static tests and impact force history in the impact tests were recorded. The damage was assessed by using ultrasonic C-scanning and photomicrographic techniques. The static behavior of the laminates and damage progression during loading, unloading, and reloading were explained by a simple plate delamination model. A good correlation existed between the static and impact responses. It was found that results from a few static indentation-flexture tests can be used to predict the response and damage in composite laminates due to a class of low velocity impact events. Kwon, Young S. and Sankar, Bhavani V. GRAPHITE-EPOXY COMPOSITES; IMPACT DAMAGE; IMPACT TESTS; INDENTATION; LOW SPEED; MATHEMATICAL MODELS; STATIC TESTS; DELAMINATING; LAMINATES; MECHANICAL PROPERTIES; NONDESTRUCTIVE TESTS; PHOTOMICROGRAPHS; STRAIN ENERGY RELEASE RATE; ULTRASONIC FLAW DETECTION...

• Format: Paperback
• Language: English
• ISBN: 1731539592
• ISBN13: 9781731539595
• Release Date: January 1
• Publisher: Independently Published
• Length: 176 Pages
• Weight: 0.93 lbs.
• Dimensions: 0.4" x 8.5" x 11.0"