Experimental Study of Compression-Compression Fatigue of Graphite/Epoxy Composites PDF Download
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Author: GC. Grimes
Publisher:
ISBN:
Category : Anisotropic
Languages : en
Pages : 57
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Book Description
The objective of the study is to determine the static compression and R = 10 constant frequency compression-compression fatigue properties of Hercules AS/3501-6 tape graphite/epoxy composites. Environmental conditions selectively used are: (1) room temperature dry, (2) room temperature wet (1.1 percent by weight), (3) 103.3°C (218°F) dry, and (4) 103.3°C (218°F) wet (1.1 percent by weight). Ply orientations studied are [0]nt, [90]nt, [±45]ns, and [(±45)5/016/904]c. All fatigue testing is at room temperature with subsequent residual strength testing on survivors at 103.3°C (218°F). New test methods are developed. Degradation is observed in the 1.25 million cycle endurance limit stresses and the compressive residual strength values compared with static properties.
Author: GC. Grimes
Publisher:
ISBN:
Category : Anisotropic
Languages : en
Pages : 57
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Book Description
The objective of the study is to determine the static compression and R = 10 constant frequency compression-compression fatigue properties of Hercules AS/3501-6 tape graphite/epoxy composites. Environmental conditions selectively used are: (1) room temperature dry, (2) room temperature wet (1.1 percent by weight), (3) 103.3°C (218°F) dry, and (4) 103.3°C (218°F) wet (1.1 percent by weight). Ply orientations studied are [0]nt, [90]nt, [±45]ns, and [(±45)5/016/904]c. All fatigue testing is at room temperature with subsequent residual strength testing on survivors at 103.3°C (218°F). New test methods are developed. Degradation is observed in the 1.25 million cycle endurance limit stresses and the compressive residual strength values compared with static properties.
Author: P. Daniel Sydow
Publisher:
ISBN:
Category : Buckling (Mechanics)
Languages : en
Pages : 24
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Book Description
Author: JE. Masters
Publisher:
ISBN:
Category : Composite materials
Languages : en
Pages : 20
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Book Description
Stitched uniwoven graphite/epoxy laminates show great promise as a damage-tolerant composite material which is easily fabricated into large net-shaped parts and structures. They also offer the potential of being less costly than other damage-tolerant systems such as toughened matrix composites. Work to date with stitched uniweaves has included evaluations of static properties and damage tolerance as measured by impact resistance, compression after impact, and delamination propagation [1-7]. This paper focuses on experimental characterization of the fatigue response of stitched uniweave composite materials.
Author: EG. Dusablon
Publisher:
ISBN:
Category : Anisotropic
Languages : en
Pages : 26
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Book Description
This study assesses the static compression and R=10 compression-compression fatigue properties of graphite/epoxy composites with ply drop-off discontinuities under severe operating environments, including room-temperature dry and wet, -65°F wet, and 218°F dry and wet. In 30-ply [(±45)5/016/904]C laminates two 0-deg plies or four 45-deg plies are dropped off, symmetrically, in the middle one third of the specimen thickness. Static strength and moduli of elasticity are unaffected by these discontinuities; however, some proportional limit values and Poisson's ratio values are significantly changed. At 1.25 x 106 cycles of constant frequency and amplitude fatigue, the algebraic minimum endurance limit stress level is degraded 15 to 30 percent by the two 0-deg ply drop-offs, but only 0 to 13 percent by the four 45-deg ply drop-offs, or is even increased somewhat. The endurance limits of the surviving specimens are lower than their residual strengths, which vary directly with maximum applied cyclic compressive stress up to a threshold level. Detailed data tables and plots are included.
Author:
Publisher: ASTM International
ISBN: 9780803107007
Category : Composite materials
Languages : en
Pages : 458
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Book Description
Author: Ronald F. Gibson
Publisher: DEStech Publications, Inc
ISBN: 1605950858
Category : Technology & Engineering
Languages : en
Pages : 245
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Book Description
Presents investigations into fatigue in composite materials and structures. Sections include: research into aspects of fatigue modeling including prediction of fatigue life, fatigue strength and fatigue crack growth rate; experimental characterization of fatigue in composites, and discussing fatigue behavior of fullscale composite structures.
Author: J. T. Ryder
Publisher:
ISBN:
Category :
Languages : en
Pages : 274
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Book Description
The main objective of this research investigation was the experimental determination of the effect of compressive loading on the fatigue response of graphite/epoxy lamiantes. The primary emphasis of the program was on the accumulation of a statistically significant data base. The data base was to be used for developing an analytical model with predictive capability to account for the effect of compressive loading. The test program included only unnotched coupons in a room temperature, laboratory air environment. The test program consisted of static tensile and compressive tests; tension-tension and tension-compression fatigue tests; and tensile and compressive residual strength tests of coupons tested either under tension-tension or tension-compression fatigue loading. The development of a large, statistically meaningful data base was accomplished. The general effect of compression on the fatigue response of a graphite/epoxy composite was determined. However, a general model with capability to account for compressive loading was not attempted. As an alternate, the concept of a fatigue threshold was postulated along with consideration of some substantiating data. Analysis of the data showed that due to the extent of data scatter, a model of the 'wear-out' or similar type would predict the need for unacceptably low stress levels to achieve the high probabilities of survival required for aircraft structures.
Author: Edward M. Wu
Publisher:
ISBN:
Category : Composite materials
Languages : en
Pages : 126
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Book Description
The objective of this report is to disseminate experimental data of matrix-dominated time-dependent deformation and time-dependent damage in graphite-epoxy composite. The composite specimens were + or - 45 T300/5208 laminates tested in tension with complete instrumentation for stress, strain, and time recordings. Experimental data was recorded and archived in digital form. Polynomial series are fitted to the experimental data for compilation, dissemination and future retrieval. Data presented herein is accessible to the technical community at large for correlation and the formulation of theory from diverse perspectives, and to meet different goals in fundamental research and engineering applications.
Author: Roderick H. Martin
Publisher: ASTM International
ISBN: 0803120125
Category : Composite materials
Languages : en
Pages : 517
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 28
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