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pro vyhledávání: '"TK O'Brien"'
An important result of our investigations of the fatigue response of composite materials has been the identification and characterization of the effect of frequency of cycled loads (or strain). Frequency has been found tosignificantly influence the f
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f5e98cc843f2e3262dcf088f36de3c50
https://doi.org/10.1520/stp27977s
https://doi.org/10.1520/stp27977s
Autor:
Satish A. Salpekar, TK O'Brien
The effect of the stress-free edge on the growth of local delaminations initiating from a matrix crack in (0 sub 2/90 sub 4) sub s and (+ or - 45.90 sub 4) sub s glass epoxy laminates is investigated using 3-D finite element analysis. The presence of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a4b7377ec64e91a9bd1a79d8cbbce795
https://doi.org/10.1520/stp17724s
https://doi.org/10.1520/stp17724s
Autor:
TK O'Brien
Constant amplitude tension-tension fatigue tests were conducted on AS4/3501-6 graphite/epoxy (02/ theta sub 2/ -(theta sub 2))sub s laminates, where theta was 15, 20, 25, or 30 degrees. Fatigue tests were conducted at a frequency of 5 Hz and an R-rat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7d0fc79fe6ba5778f416538f5359d6bc
https://doi.org/10.1520/stp24748s
https://doi.org/10.1520/stp24748s
Tapered (0 deg) laminates of S2/CE9000 and S2/SP250 glass/epoxies, and IM6/1827I graphite/epoxy were tested in cyclic tension. The specimens usually showed some initial stable delaminations in the tapered region, but these did not affect the stiffnes
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0121bb084b8a44c364c298e9ff3ac463
https://doi.org/10.1520/stp17725s
https://doi.org/10.1520/stp17725s
Autor:
TK O'Brien, SA Salpekar
The influence of material volume on the transverse tensile strength of AS4/3501-6 graphite epoxy composites was investigated. Tensile tests of 90 degree laminates with 3 different widths and 5 different thicknesses were conducted. A finite element an
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::81c2ef22d19fba280020d9d01282983f
https://doi.org/10.1520/stp12618s
https://doi.org/10.1520/stp12618s
Autor:
SJ Hooper, TK O'Brien
Quasi-static tension tests were conducted on AS4/3501-6 graphite epoxy laminates. Dye penetrant enhanced x-radiography was used to document the onset of matrix cracking and the onset of local delaminations at the intersection of the matrix cracks and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::15485524874ae8e663fea1a3efcaa151
https://doi.org/10.1520/stp24747s
https://doi.org/10.1520/stp24747s
Autor:
J Li, TK O'Brien
A shear deformation theory including residual thermal and moisture effects is developed for the analysis of either symmetric or asymmetric laminates with midplane edge delamination under torsional loading. The theory is based on an assumed displaceme
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::79cbf1e38f35b91c110d642fdced224b
https://doi.org/10.1520/stp19940s
https://doi.org/10.1520/stp19940s