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A comparison of quasi-static indentation to low-velocity impact

Author: A T Nettles; M J Douglas; George C. Marshall Space Flight Center.
Publisher: [Marshall Space Flight Center, AL] : National Aeronautics and Space Administration, Marshall Space Flight Center, [2000]
Series: NASA technical paper, 210481.
Edition/Format:   eBook : Document : National government publication : EnglishView all editions and formats
Summary:
A static test method for modeling low-velocity foreign object impact events to composites would prove to be very beneficial to researchers since much more data can be obtained from a static test than from an impact test. In order to examine if this is feasible, a series of static indentation and low-velocity impact tests were carried out and compared. Square specimens of many sizes and thicknesses were utilized to  Read more...
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Genre/Form: Technical Publication
Additional Physical Format: Print version:
Nettles, A.T. (Alan T.).
Comparison of quasi-static indentation to low-velocity impact.
(OCoLC)46009258
Microfiche:
Nettles, A.T. (Alan T.).
Comparison of quasi-static indentation to low-velocity impact.
(OCoLC)55626818
Material Type: Document, Government publication, National government publication, Internet resource
Document Type: Internet Resource, Computer File
All Authors / Contributors: A T Nettles; M J Douglas; George C. Marshall Space Flight Center.
OCLC Number: 703646099
Notes: Title from title screen (viewed on Jan. 17, 2013).
"August 2000."
Pdf.
[Page Count] 94.
Description: 1 online resource (x, 83 pages) : illustrations.
Series Title: NASA technical paper, 210481.
Responsibility: A.T. Nettles, M.J. Douglas.

Abstract:

A static test method for modeling low-velocity foreign object impact events to composites would prove to be very beneficial to researchers since much more data can be obtained from a static test than from an impact test. In order to examine if this is feasible, a series of static indentation and low-velocity impact tests were carried out and compared. Square specimens of many sizes and thicknesses were utilized to cover the array of types of low-velocity impact events. Laminates with a pi/4 stacking sequence were employed since this is by far the most common type of engineering laminate. Three distinct flexural rigidities under two different boundary conditions were tested in order to obtain damage ranging from that due to large deflection to contact stresses and levels in-between to examine if the static indentation-impact comparisons are valid under the spectrum of damage in-between to examine if the static indentation-impact comparisons are valid under the spectrum of damage modes that can be experienced. Comparisons between static indentation and low-velocity impact tests were based on the maximum applied transverse load. The dependent parameters examined included dent depth, back surface crack length, delamination area, and to a limited extent, load-deflection behavior. Results showed that no distinct differences could be seen between the static indentation tests and the low-velocity impact tests, indicating that static indentation can be used to represent a low-velocity impact event.

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