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001 ocn703646099;

003 OCoLC;

005 20141212052100.0;

006 m o d f ;

007 cr bn|||||||||;

008 110225s2000 alua obt f000 0 eng c;

024 8 a| NASA/TP-210481;

029 0 a| SSMb| oai:NASA-MSFC-EPRINTS.OAI2:523c| http://trs.nis.nasa.gov/perl/oai2 7374617475733D707562t| DGCNT;

035 a| (Sirsi) o703646099;

040 a| SSMc| SSMd| GPOd| UtOrBLW;

042 a| pcc;

049 a| ERE#;

074 a| 0830-H-15 (online);

086 0 a| NAS 1.60:2000-210481;

100 1 a| Nettles, A. T.q| (Alan T.)=| ^A573713;

245 12 a| A comparison of quasi-static indentation to low-velocity impact /c| A. T. Nettles, M. J. Douglas.;

260 a| [Marshall Space Flight Center, AL] :b| National Aeronautics and Space Administration, Marshall Space Flight Center,c| [2000];

300 a| 1 online resource (x, 83 pages) :b| illustrations.;

336 a| text2| rdacontent;

337 a| computer2| rdamedia;

338 a| online resource2| rdacarrier;

490 1 a| [NASA technical paper] ;v| NASA TP-2000-210481;

500 a| Title from title screen (viewed on Jan. 17, 2013).;

500 a| "August 2000.";

520 8 a| 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.;

540 a| No Copyright.;

540 a| Unclassified.;

540 a| Publicly Available.;

540 a| Unlimited.;

500 a| pdf.;

500 a| [ Page Count ] 94.;

504 a| Includes bibliographical references (p. 82-83).;

536 d| M-991;

650 7 a| Low speed.2| nasat;

650 7 a| Composite materials.2| nasat;

650 7 a| Impact tests.2| nasat;

650 7 a| Indentation.2| nasat;

650 7 a| Static tests.2| nasat;

650 7 a| Mechanical properties.2| nasat;

653 a| Composite Materials;

700 1 a| Douglas, M. J.q| (Michael J.)=| ^A793169;

710 2 a| George C. Marshall Space Flight Center.=| ^A77995;

776 08 i| Print version:a| Nettles, A. T. (Alan T.).t| comparison of quasi-static indentation to low-velocity impact.w| (OCoLC)46009258;

776 08 i| Microfiche:a| Nettles, A. T. (Alan T.).t| comparison of quasi-static indentation to low-velocity impact.w| (OCoLC)55626818;

830 0 a| NASA technical paperv| 210481.=| ^A367864;

856 40 u| https://purl.fdlp.gov/GPO/gpo33154;

949 a| Click on web addressw| ASISh| JOYNER94;

998 a| 3273405;

998 a| u3273405;

596 a| 1;

999 a| CLICK ON WEB ADDRESSw| ASISc| 1i| 3273405-1001l| JNETm| JOYNERr| Ys| Yt| JNE1DOu| 2/18/2013x| EDOCUMENTz| JERESOURCE;

A comparison of quasi-static indentation to low-velocity impact / A. T. Nettles, M. J. Douglas.

Author/creator	Nettles, A. T.
Other author	Douglas, M. J. (Michael J.)
Other author	George C. Marshall Space Flight Center.
Format	Electronic
Publication Info	[Marshall Space Flight Center, AL] : National Aeronautics and Space Administration, Marshall Space Flight Center, [2000]
Description	1 online resource (x, 83 pages) : illustrations.
Supplemental Content	https://purl.fdlp.gov/GPO/gpo33154

Series	[NASA technical paper] ; NASA TP-2000-210481 NASA technical paper 210481. ^A367864
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 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.
General note	Title from title screen (viewed on Jan. 17, 2013).
General note	"August 2000."
General note	pdf.
General note	[ Page Count ] 94.
Bibliography note	Includes bibliographical references (p. 82-83).
Funding information	M-991
Terms of use	No Copyright.
Terms of use	Unclassified.
Terms of use	Publicly Available.
Terms of use	Unlimited.
Issued in other form	Print version: Nettles, A. T. (Alan T.). comparison of quasi-static indentation to low-velocity impact.
Issued in other form	Microfiche: Nettles, A. T. (Alan T.). comparison of quasi-static indentation to low-velocity impact.
Standard identifier#	NASA/TP-210481
GPO item number	0830-H-15 (online)
Govt. docs number	NAS 1.60:2000-210481

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A comparison of quasi-static indentation to low-velocity impact / A. T. Nettles, M. J. Douglas.

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