WorldCat Identities

Nettles, A. T. (Alan T.)

Overview
Works: 38 works in 89 publications in 1 language and 5,104 library holdings
Genres: Conference papers and proceedings 
Roles: Author
Publication Timeline
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Most widely held works by A. T Nettles
Permeability testing of impacted composite laminates for use on reusable launch vehicles by A. T Nettles( )

2 editions published in 2001 in English and held by 337 WorldCat member libraries worldwide

Since composite laminates are beginning to be identified for use in reusable launch vehicle propulsion systems, an understanding of their permeance is needed. A foreign object impact event can cause a localized area of permeability (leakage) in a polymer matrix composite, and it is the aim of this study to assess a method of quantifying permeability-after-impact results. A simple test apparatus is presented, and variables that could affect the measured values of permeability-after-impact were assessed. Once it was determined that valid numbers were being measured, a fiber/resin system was impacted at various impact levels and the resulting permeability measured, first with a leak check solution (qualitative) then using the new apparatus (quantitative). The results showed that as the impact level increased, so did the measured leakage. As the pressure to the specimen was increased, the leak rate was seen to increase in a nonlinear fashion for almost all the specimens tested
A comparison of quasi-static indentation to low-velocity impact by A. T Nettles( )

3 editions published in 2000 in English and held by 324 WorldCat member libraries worldwide

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
The impact response of carbon/epoxy laminates by A. T Nettles( )

2 editions published in 1997 in English and held by 308 WorldCat member libraries worldwide

Low velocity dropweight impact tests were conducted on carbon/epoxy laminates under various boundary conditions. The composite plates were 8-ply (+45,0,-45,90)s laminates supported in a clamped-clamped/free-free configuration with varying amounts of in-plane load, N(sub x), applied. Specimens were impacted at energies of 3.4, 4.5, and 6 Joules (2.5, 3.3, and 4.4 ft-lb). The amount of damage induced into the specimen was evaluated using instrumented impact techniques, x-ray inspection, and cross-sectional photomicroscopy. Some static identation tests were performed to examine if the impact events utilized in this study were of a quasi-static nature and also to gain insight into the shape of the deflected surface at various impact load combinations. Load-displacement curves from these tests were compared to those of the impact tests, as was damage determined from x-ray inspection. The finite element technique was used to model the impact event and determine the stress field within the laminae. Results showed that for a given impact energy level, more damage was induced into the specimen as the external in-plane load, N(sub x), was increased. The majority of damage observed consisted of back face splitting of the matrix parallel to the fibers in that ply, associated with delaminations emanating from these splits. The analysis showed qualitatively the results of impact conditions on maximum load of impact, maximum transverse deflection, and first failure mode and location
An experimental study of a stitched composite with a notch subjected to combined bending and tension loading by Susan O Palmer( )

4 editions published in 1999 in English and held by 237 WorldCat member libraries worldwide

A series of tests was conducted to measure the strenght of stitched carbon/epoxy composites containing through-thickness damage in the form of a crack-like notch. The specimens were subjected to three types of loading : pure bending, pure tension, and combined bending and tension loads. Measurements of applied loads, strains near crack tips, and crack opening displacements (COD) were monitored in all tests. The transverse displacement at the center of the specimen was measured using a linear variable differential transformer (LVDT). The experimental data showed that the outer surface of the pure tension specimen failed at approximately 6,000 microstrain, while in combined bending and tension loads the measured tensile strains reached 10,000 microstrain
Comparison of open-hole compression strength and compression after impact strength on carbon fiber/epoxy laminates for the Ares I composite interstage by A. J Hodge( )

1 edition published in 2011 in English and held by 217 WorldCat member libraries worldwide

The effects of foam thermal protection system on the damage tolerance characteristics of composite sandwich structures for launch vehicles by A. T Nettles( )

1 edition published in 2011 in English and held by 217 WorldCat member libraries worldwide

Normalization of impact energy by laminate thickness for compression after impact testing by A. T Nettles( )

1 edition published in 2013 in English and held by 214 WorldCat member libraries worldwide

Hot/wet open hole compression strength of carbon/epoxy laminates for launch vehicle applications by A. T Nettles( )

1 edition published in 2009 in English and held by 214 WorldCat member libraries worldwide

A damage tolerance comparison of composite hat-stiffened and honeycomb sandwich structure for launch vehicle interstage applications by A. T Nettles( )

1 edition published in 2011 in English and held by 213 WorldCat member libraries worldwide

Simplification of fatigue test requirements for damage tolerance of composite interstage launch vehicle hardware by A. T Nettles( )

1 edition published in 2010 in English and held by 209 WorldCat member libraries worldwide

The effects of compressive preloads on the compression-after-impact strength of carbon/epoxy by A. T Nettles( )

1 edition published in 1992 in English and held by 196 WorldCat member libraries worldwide

Composite materials : testing, design, and acceptance criteria by Abdul-Hamid Zureick( Book )

8 editions published between 2002 and 2011 in English and held by 164 WorldCat member libraries worldwide

"ASTM Stock Number: STP1416. - "The symposium was sponsored by ASTM International Committee D30 on Composite Materials."--Foreword. - Includes bibliographical references and indexes. - Electronic reproduction; W. Conshohocken, Pa; ASTM International; 2011; Mode of access: World Wide Web; System requirements: Web browser; Access may be restricted to users at subscribing institutions
An examination of impact damage in glass/phenolic and aluminum honeycomb core composite panels by A. T Nettles( Book )

4 editions published in 1990 in English and held by 155 WorldCat member libraries worldwide

Instrumented impact and residual tensile strength testing of eight-ply carbon/epoxy specimens by A. T Nettles( Book )

5 editions published in 1990 in English and held by 155 WorldCat member libraries worldwide

Polymer matrix composite lines and ducts by A. T Nettles( Book )

2 editions published in 2001 in English and held by 139 WorldCat member libraries worldwide

Polymer matrix composites -- Feed systems -- Impact tests -- Laminates -- Cryogenics -- Nondestructive tests
A damage resistance comparison between candidate polymer matrix composite feedline materials by A. T Nettles( Book )

3 editions published in 2000 in English and held by 137 WorldCat member libraries worldwide

Cross-sectional examination of the damage zone in impacted specimens of carbon/epoxy and carbon/peek composites by A. T Nettles( Book )

1 edition published in 1990 in English and held by 130 WorldCat member libraries worldwide

An examination of the damage tolerance enhancement of carbon/epoxy using an outer lamina of Spectra by D. G Lance( Book )

5 editions published in 1991 in English and held by 125 WorldCat member libraries worldwide

A novel method of testing the shear strength of thick honeycomb composites by A. J Hodge( Book )

4 editions published in 1991 in English and held by 108 WorldCat member libraries worldwide

Scaling effects in carbon/epoxy laminates under transverse quasi-static loading by A. T Nettles( Book )

4 editions published in 1999 in English and Undetermined and held by 104 WorldCat member libraries worldwide

 
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Composite materials : testing, design, and acceptance criteria
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Alternative Names
Nettles, Alan T.

Languages
English (53)