NDLI: Normalization of impact energy by laminate thickness for compression after impact testing

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Normalization of impact energy by laminate thickness for compression after impact testing

Content Provider	NASA Technical Reports Server (NTRS)
Author	Hromisin, S. M. Nettles, A. T.
Copyright Year	2013
Description	The amount of impact energy used to damage a composite laminate is a critical parameter when assessing residual strength properties. The compression after impact (CAI) strength of impacted laminates is dependent upon how thick the laminate is and this has traditionally been accounted for by normalizing (dividing) the impact energy by the laminate's thickness. However, when comparing CAI strength values for a given lay-up sequence and fiber/resin system, dividing the impact energy by the specimen thickness has been noted by the author to give higher CAI strength values for thicker laminates. A study was thus undertaken to assess the comparability of CAI strength data by normalizing the impact energy by the specimen thickness raised to a power to account for the higher strength of thicker laminates. One set of data from the literature and two generated in this study were analyzed by dividing the impact energy by the specimen thickness to the 1, 1.5, 2, and 2.5 powers. Results show that as laminate thickness and damage severity decreased, the value which the laminate thickness needs to be raised to in order to yield more comparable CAI data increases.
File Size	1642329
Page Count	52
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20130013421
Archival Resource Key	ark:/13960/t0xq20k2r
Language	English
Publisher Date	2013-04-01
Access Restriction	Open
Subject Keyword	Composite Materials Thickness Impact Strength Comparison Compression Loads Mechanical Properties Graphite-epoxy Composites Impact Tests Laminates Impact Tolerances Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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