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Author: National Aeronautics and Space Adm Nasa Publisher: Independently Published ISBN: 9781792848131 Category : Languages : en Pages : 28
Book Description
A finite element analysis was conducted to determine the stress distribution in typical graphite/epoxy composite flat wise tension (FWT) specimens under normal loading conditions. The purpose of the analysis was to determine the relationship between the applied load and the stress in the sample to evaluate the validity of the test as a means of measuring the out-of-plane strength of a composite laminate. Three different test geometries and three different material lay ups were modeled. In all cases, the out-of-plane component of stress in the test section was found to be uniform, with no stress concentrations, and very close to the nominal applied stress. The stress in the sample was found to be three-dimensional, and the magnitude of in-plane normal and shear stresses varied with the anisotropy of the test specimen. However, in the cases considered here, these components of stress were much smaller than the out-of-plane normal stress. The geometry of the test specimen had little influence on the results. It was concluded that the flat wise tension test provides a good measure of the out-of-plane strength for the representative materials that were studied. Scott, Curtis A. and Pereira, J. Michael Glenn Research Center NASA-TM-106074, E-7683, NAS 1.15:106074 RTOP 505-63-1B...
Author: National Aeronautics and Space Adm Nasa Publisher: Independently Published ISBN: 9781792848131 Category : Languages : en Pages : 28
Book Description
A finite element analysis was conducted to determine the stress distribution in typical graphite/epoxy composite flat wise tension (FWT) specimens under normal loading conditions. The purpose of the analysis was to determine the relationship between the applied load and the stress in the sample to evaluate the validity of the test as a means of measuring the out-of-plane strength of a composite laminate. Three different test geometries and three different material lay ups were modeled. In all cases, the out-of-plane component of stress in the test section was found to be uniform, with no stress concentrations, and very close to the nominal applied stress. The stress in the sample was found to be three-dimensional, and the magnitude of in-plane normal and shear stresses varied with the anisotropy of the test specimen. However, in the cases considered here, these components of stress were much smaller than the out-of-plane normal stress. The geometry of the test specimen had little influence on the results. It was concluded that the flat wise tension test provides a good measure of the out-of-plane strength for the representative materials that were studied. Scott, Curtis A. and Pereira, J. Michael Glenn Research Center NASA-TM-106074, E-7683, NAS 1.15:106074 RTOP 505-63-1B...
Author: Composite Materials Handbook – 17 (CMH-17) Publisher: SAE International ISBN: 0768078113 Category : Technology & Engineering Languages : en Pages : 721
Book Description
Volume 1 of this six-volume compendium contains guidelines for determining the properties of polymer matrix composite material systems and their constituents, as well as the properties of generic structural elements, including test planning, test matrices, sampling, conditioning, test procedure selection, data reporting, data reduction, statistical analysis, and other related topics. Special attention is given to the statistical treatment and analysis of data. Volume 1 contains guidelines for general development of material characterization data as well as specific requirements for publication of material data in CMH-17. The Composite Materials Handbook, referred to by industry groups as CMH-17, is a six-volume engineering reference tool that contains over 1,000 records of the latest test data for polymer matrix, metal matrix, ceramic matrix, and structural sandwich composites. CMH-17 provides information and guidance necessary to design and fabricate end items from composite materials. It includes properties of composite materials that meet specific data requirements as well as guidelines for design, analysis, material selection, manufacturing, quality control, and repair. The primary purpose of the handbook is to standardize engineering methodologies related to testing, data reduction, and reporting of property data for current and emerging composite materials. It is used by engineers worldwide in designing and fabricating products made from composite materials.
Author: Donald W. Oplinger Publisher: ISBN: Category : Shear (Mechanics) Languages : en Pages : 26
Book Description
This report covers stress analysis and experimental studies of four types of tension specimens designed for testing composite materials. Two ASTM specimen types (D3039 tab-ended and D638 dogbone) are considered, along with the bowtie (flat bar with linear taper) design developed by Grumman and a streamline design developed at AMMRC. Stress analyses of the first three types show them to be subjected to high shear stresses and tensile stress concentrations which tend to degrade their performance. Experimental studies generally tended to confirm that failures initiated where the stress peaks were predicted, and suggest that elimination of such peaks would lead to a better-performing tension specimen. Stress analysis of the AMMRC streamline design showed how shear stress levels and indicated that the design is free of tensile stress concentrations. Results of efforts aimed at experimental evaluation of the streamline specimen indicate that it has much promise as an improved design for tension testing, both under monotonic and cyclic loading. (Author).
Author: Kier M. Finlayson Publisher: CRC Press ISBN: 1000125149 Category : Technology & Engineering Languages : en Pages : 888
Book Description
This book contains technical papers, presented at the Sixth Japan-U.S. Conference on Composite Materials held in Orlando in 1982, on various topics, including stress analysis, interfaces and material systems, micromechanics, structural analysis, design and optimization, and strength analysis.
Author: G. Foley Publisher: ISBN: Category : Composite materials Languages : en Pages : 24
Book Description
Tensile and shear stress concentrations have been found in prior work to degrade the performance of tension test specimen designs in current use. In the particular case of tabbed specimens there is need for an alternative specimen design to avoid problems with tab failures and loss of tabs when testing in adverse environments. The streamline shape which is described here provides such an alternative. This paper discusses the theoretical background to the streamline shape, together with results of studies in which its performance is compared experimentally with other specimen types, especially tabbed specimens, in both static and fatigue testing environments.
Author: National Aeronautics and Space Adm Nasa
Author: National Aeronautics and Space Adm Nasa
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Author: Composite Materials Handbook – 17 (CMH-17)
Author: Donald W. Oplinger
Author: Kier M. Finlayson
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Author: 
Author: G. Foley