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There are a total of 17 record(s) matching your query.
Sorted by: Date Added To NTRS in Descending order
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Characterization of Mode 1 and Mode 2 delamination growth and thresholds in graphite/peek composites
Author(s): Martin, Roderick H.; Murri, Gretchen B.
Abstract: Composite materials often fail by delamination. The onset and growth of delamination in AS4/PEEK, a tough thermoplastic matrix composite, was characterized for mode 1 and mode 2 loadings, using the Double Cantilever Beam ...
NASA Center: Langley Research Center
Publication Year: 1988
Added to NTRS: 2005-10-13
Accession Number: 88N22947; Document ID: 19880013563; Report Number: AVSCOM-TM-88-B-011, NAS 1.15:100577, NASA-TM-100577
Characterizing Mode-I Fatigue Delamination Of Laminates
Author(s): Martin, Roderick H.; Obrien, T. Kevin
Abstract: Alternative method proposed for characterizing mode-I fatigue delamination by use of double-cantilever-beam (DCB). In new method, one monitors number of cycles, N, to onset of delamination from end of thin insert. Fiber ...
NASA Center: Langley Research Center
Publication Year: 1993
Added to NTRS: 2005-09-30
Accession Number: 93B10408; Document ID: 19930000408; Report Number: LAR-14414
Results of ASTM round robin testing for mode 1 interlaminar fracture toughness of composite materials
Author(s): Obrien, T. Kevin; Martin, Roderick H.
Abstract: The results are summarized of several interlaboratory 'round robin' test programs for measuring the mode 1 interlaminar fracture toughness of advanced fiber reinforced composite materials. Double Cantilever Beam (DCB) tests ...
NASA Center: Langley Research Center
Publication Year: 1992
Added to NTRS: 2005-08-25
Accession Number: 93N13428; Document ID: 19930004240; Report Number: AVSCOM-TR-92-B-013, NAS 1.15:104222, NASA-TM-104222
Damage prediction in cross-plied curved composite laminates
Author(s): Martin, Roderick H.; Jackson, Wade C.
Abstract: Analytical and experimental work is detailed which is required to predict delamination onset and growth in a curved cross plied composite laminate subjected to static and fatigue loads. The composite used was AS4/3501/6, ...
NASA Center: Langley Research Center
Publication Year: 1991
Added to NTRS: 2005-08-25
Accession Number: 91N30567; Document ID: 19910021253; Report Number: AVSCOM-TR-91-B-009, NAS 1.15:104089, NASA-TM-104089
Isothermal aging of IM7/8320 and IM7/5260
Author(s): Martin, Roderick H.; Siochi, Emilie J.; Gates, Thomas S.
Abstract: Isothermal aging was conducted on two composite systems being considered as possible candidates for the next generation supersonic transport. The composite systems were IM7/5260, a carbon/thermoset, and IM7/8320, a ...
NASA Center: Langley Research Center
Publication Year: 1992
Added to NTRS: 2005-08-25
Accession Number: 92N33423; Document ID: 19920024179; Report Number: NAS 1.15:107666, NASA-TM-107666
Effect of initial delamination on Mode 1 and Mode 2 interlaminar fracture toughness and fatigue fracture threshold
Author(s): Murri, Gretchen Bostaph; Martin, Roderick H.
Abstract: Static and fatigue double-cantilever beam (DCB) and end-notch flexure (ENF) tests were conducted to determine the effect of the simulated initial delamination in interlaminar fracture toughness, G(sub c), and fatigue ...
NASA Center: Langley Research Center
Publication Year: 1991
Added to NTRS: 2005-08-25
Accession Number: 91N26569; Document ID: 19910017255; Report Number: AVSCOM-TR-91-B-005, NAS 1.15:104079, NASA-TM-104079
Evaluation of the split cantilever beam for Mode 3 delamination testing
Author(s): Martin, Roderick H.
Abstract: A test rig for testing a thick split cantilever beam for scissoring delamination (mode 3) fracture toughness was developed. A 3-D finite element analysis was conducted on the test specimen to determine the strain energy ...
NASA Center: Langley Research Center
Publication Year: 1989
Added to NTRS: 2005-08-25
Accession Number: 89N22132; Document ID: 19890012761; Report Number: NAS 1.15:101562, NASA-TM-101562
Delamination failure in a unidirectional curved composite laminate
Author(s): Martin, Roderick H.
Abstract: Delamination failure in a unidirectional curved composite laminate was investigated. The curved laminate failed unstably by delaminations developing around the curved region of the laminate at different depths through the ...
NASA Center: NASA (non Center Specific)
Publication Year: 1990
Added to NTRS: 2005-08-25
Accession Number: 90N21421; Document ID: 19900012105; Report Number: NAS 1.26:182018, NASA-CR-182018
An interlaminar tension strength specimen
Author(s): Jackson, Wade C.; Martin, Roderick H.
Abstract: This paper describes a technique to determine interlaminar tension strength, sigma(sub 3c) of a fiber reinforced composite material using a curved beam. The specimen was a unidirectional curved beam, bent 90 degrees, with ...
NASA Center: Langley Research Center
Publication Year: 1992
Added to NTRS: 2005-08-25
Accession Number: 92N29393; Document ID: 19920020150; Report Number: AD-A254049, AVSCOM-TR-92-B-008, NAS 1.15:107623, NASA-TM-107623
Delamination onset in polymeric composite laminates under thermal and mechanical loads
Author(s): Martin, Roderick H.
Abstract: A fracture mechanics damage methodology to predict edge delamination is described. The methodology accounts for residual thermal stresses, cyclic thermal stresses, and cyclic mechanical stresses. The modeling is based on the ...
NASA Center: NASA (non Center Specific)
Publication Year: 1991
Added to NTRS: 2005-08-25
Accession Number: 92N14432; Document ID: 19920005214; Report Number: NAS 1.26:189548, NASA-CR-189548
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