Experimental Investigation of Moisture and Temperature Conditioning of C600/5280 Graphite/epoxy Composite Material PDF Download
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Author: Kenneth Allen Grieger
Publisher:
ISBN:
Category : Composite materials
Languages : en
Pages : 170
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Author: Kenneth Allen Grieger
Publisher:
ISBN:
Category : Composite materials
Languages : en
Pages : 170
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Author: K. N. Lauraitis
Publisher:
ISBN:
Category :
Languages : en
Pages : 78
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Book Description
Effect of low speed impact damage on composite materials is a new and potentially significant design condition for high performance systems. In metallic structure, damage due to tool drop, small rock impact and hail (while on the ground) did not constitute a damage of major concern. However, composites generally exhibit little inelastic ductility, are sensitive to secondary stresses, and are susceptible to splitting and delamination with cracks often propagating in the fiber direction through debonding. Upon failure, energy absorption is low. Due to these fracture characteristics and the low strain to failure, composite materials generally exhibit lower impact resistance than the metals typically used for aircraft construction. Environmental exposure may aggravate the deleterious effects of impact damage. It is well known that the mechanical properties of a polymeric matrix are susceptible to environmental degradation. Matrix cracking resulting from impact, loading or thermal cycling may provide pathways for moisture which can enter by laminar flow much more rapidly than by diffusion upon subsequent exposure to high humidity environment. Detrimental effects may also be expected because the internal tensile stress in the matrix increases with decreasing temperature, promoting crazing and the formation of microvoids.
Author: Brian Thomas Uffen
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 26
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Results of an experimental study of the influence of strain rate, temperature, and humidity on the mechanical behavior of a graphite/epoxy fiber composite are presented. Three principal strengths (longitudinal, transverse, and shear) and four basic moduli (E1, E2, G12, and V12) of a unidirectional graphite/epoxy (T300/5208) composite were followed as a function of strain rate, temperature and humidity. Each test was performed at a constant tensile strain rate in an environmental chamber providing simultaneous temperature and humidity control. Prior to testing, specimens were given a moisture preconditioning treatment at 60 deg C. Values for the matrix-dominated moduli and strength were significantly influenced by both environmental and rate parameters, whereas the fiber-dominated moduli were not. However, the longitudinal strength was significantly influenced by temperature and moisture content. A qualitative explanation for these observations is presented. jg p26.
Author: Ram Prasad
Publisher: Springer
ISBN: 3030124967
Category : Science
Languages : en
Pages : 407
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An improved understanding of the interactions between nanoparticles and plant retorts, including their uptake, localization, and activity, could revolutionize crop production through increased disease resistance, nutrient utilization, and crop yield. This may further impact other agricultural and industrial processes that are based on plant crops. This two-volume book analyses the key processes involved in the nanoparticle delivery to plants and details the interactions between plants and nanomaterials. Potential plant nanotechnology applications for enhanced nutrient uptake, increased crop productivity and plant disease management are evaluated with careful consideration regarding safe use, social acceptance and ecological impact of these technologies. Plant Nanobionics: Volume 1, Advances in the Understanding of Nanomaterials Research and Applications begins the discussion of nanotechnology applications in plants with the characterization and nanosynthesis of various microbes and covers the mechanisms and etiology of nanostructure function in microbial cells. It focuses on the potential alteration of plant production systems through the controlled release of agrochemicals and targeted delivery of biomolecules. Industrial and medical applications are included. Volume 2 continues this discussion with a focus on biosynthesis and toxicity.
Author: Richard J. DeIasi
Publisher:
ISBN:
Category : Composite materials
Languages : en
Pages : 76
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Author: K. G. Kibler
Publisher:
ISBN:
Category :
Languages : en
Pages : 152
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Experimental and analytical investigations have been conducted to determine the individual and combined effects of temperature and absorbed moisture on the time-dependent mechanical response of unidirectional and cross- plied graphite-epoxy composite. Tensile creep response was measured at room temperature and four elevated temperatures (up to the glass transition region of the materials) for dry specimens and for specimens moisture-saturated at 75% and 95% relative humidity. Results were obtained for two material systems: Narmco T300-5208 and Hercules AS/3502. The stress levels used were demonstrated to be within the range of linear viscoelastic response. Superposition techniques were used to determine compliance master curves from the results for individual temperature and moisture condition, and quasi-elastic conversion was employed to extract relaxation modules behavior. Expansional strains due to temperature and moisture were measured. From measured principal properties, laminate response was predicted using time-stepped elastic analyses for the environments considered. Analytical procedures for transient and nonuniform temperature and moisture conditions were formulated. An analytical method for minimizing residual stresses during cure was developed, and sample results for the present materials are presented. Observations and recommended resulting from these investigations are included in this final report.
Author: T. S. Cook
Publisher:
ISBN:
Category :
Languages : en
Pages : 130
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A combined analytical and experimental study was designed to characterize moisture obsorption in graphite/epoxy composite materials. Tests were designed to investigate the influence on moisture absorption of a number of composite parameters including thickness, fiber volume, and lay-up configuration. The environmental parameters investigated were the effects of temperature and humidity; the effect of small applied strains was also evaluated by use of four point bend specimens. The results were analyzed by comparing the weight gain characteristics of the various panels, and by evaluating the coefficients of diffusion for the specimens. Based on these diffusivities, one and three dimensional solutions to Fick's equation were evaluated. A micromechanical model for laminates were developed and analyzed; the experimental data showed the model to be a lower bound solution. Moreover, the results indicate the classical solution to the one dimensional Fick's law based on effective diffusivity can be used to predict weight gain of a graphite/epoxy panel due to the presence of water. This model cannot currently predict secondary diffusion effects. The results of the bending tests showed no effect of small applied strains on the weight gain of the bend specimens. (Author).
Author: Kai J. Baumann
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: Richard W. Miller
Publisher: McGraw-Hill Companies
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 992
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