Through-Thickness Strain Response of Thick Composites in Compression PDF Download
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Author: Publisher: ISBN: Category : Languages : en Pages : 41
Book Description
With the continued success of composite materials in high performance structures, new applications for Navy primary structure are being identified. Many of these applications require designs with composite materials having section thicknesses greater than those that have been used and studied to date. Along with this interest in thick composite structures comes the need for full three-dimensional stress analysis. The limits and accuracy of existing three- dimensional data bases will dictate the limit and accuracy of corresponding analyses. This report summarizes an investigation of the through-thickness strain response of thick composite materials subjected to compressive loading. One-half inch thick (96 ply) carbon and S2 glass reinforced composites were studied. A thick-section compression test method has been developed for the purposed of this investigation. Using this test method the longitudinal and through-thickness strain to failure, longitudinal modulus, inplane and through- thickness Poisson's ratio, and ultimate strength of these materials have been determined. The through-thickness data from the 96 ply 0 coupons show the materials to be transversely isotropic. The through-thickness data from 96 ply 0/0/90 laminates show good correlation with a theoretical solution that provides the nine elastic constants for thick orthotropic plates.
Author: Publisher: ISBN: Category : Languages : en Pages : 41
Book Description
With the continued success of composite materials in high performance structures, new applications for Navy primary structure are being identified. Many of these applications require designs with composite materials having section thicknesses greater than those that have been used and studied to date. Along with this interest in thick composite structures comes the need for full three-dimensional stress analysis. The limits and accuracy of existing three- dimensional data bases will dictate the limit and accuracy of corresponding analyses. This report summarizes an investigation of the through-thickness strain response of thick composite materials subjected to compressive loading. One-half inch thick (96 ply) carbon and S2 glass reinforced composites were studied. A thick-section compression test method has been developed for the purposed of this investigation. Using this test method the longitudinal and through-thickness strain to failure, longitudinal modulus, inplane and through- thickness Poisson's ratio, and ultimate strength of these materials have been determined. The through-thickness data from the 96 ply 0 coupons show the materials to be transversely isotropic. The through-thickness data from 96 ply 0/0/90 laminates show good correlation with a theoretical solution that provides the nine elastic constants for thick orthotropic plates.
Author: ET. Camponeschi Publisher: ISBN: Category : Composite materials Languages : en Pages : 18
Book Description
As composite materials become more attractive for use in large Navy structures, the need to understand the mechanical response of composites greater than 6.4 mm (0.25 in.) in thickness becomes a necessity.
Author: AE. Brown Publisher: ISBN: Category : Acoustic drop tower Languages : en Pages : 15
Book Description
We have been developing the capability to characterize the high strain rate response of continuous fiber polymer composites. The data presented cover strain rates from 0/s to 3000/s. A combination of test machines and specimen geometries was investigated. Strain rates from 0 to 100/s were generated using conventional and high-speed hydraulic test machines. Strain rates from 10 to 1000/s were generated using a high-energy drop tower, and rates from 1000 to 3000/s were generated using a split Hopkinson bar. Strain rates above 100/s have only been generated for uniaxial compression. Our efforts have primarily focused on developing the high-energy drop tower for these purposes. Specimen geometries for compression include tapered cubes, one-inch tubes, and solid rods. For tension, a smaller 1.27-cm-diameter version of our 5.08-cm-diameter multiaxial test specimen was developed and has been successfully used at strain rates up to 100 per second. Fixtures were also developed for performing high strain rate shear testing and through thickness penetration studies of composite plates. The objective of these experiments is to develop dynamic material models for use in finite element design tools. This presentation will focus on the methods and results obtained from this study.
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Author: Scott E. Groves
Author: Eugene Thomas Camponeschi
Author: E. T. Camponeschi Jr.
Author: ET. Camponeschi
Author: Luke Francis Thompson
Author: 
Author: 
Author: Khong Wui Gan
Author: AE. Brown