Download or read book Experimental and Computational Investigation of the Effect of Environmental Degradation on Interlaminar Shear Strength of Carbon epoxy Composites written by Avinash Reddy Akepati and published by . This book was released on 2010 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of environmental and loading conditions on the degradation of Interlaminar Shear Strength (ILSS) of the carbon-epoxy composite specimens was studied in the current research. The hygrothermal conditions capture the synergistic effects of field exposure and extreme temperatures. Short beam shear tests (SBST) were performed to determine the Interlaminar Shear Strength (ILSS) of environmentally aged composite specimens in accordance with ASTM D2344-84. Initially, a standard two-dimensional cohesive layer constitutive model with a cubic traction-separation law was employed in order to simulate the experiment using an in-house Finite Element Analysis code (NOVA-3D). Numerical instabilities encountered using the standard elastic cohesive layer model were overcome by incorporating viscoelastic regularization in the constitutive equations of the cohesive layer. This modification also enabled the analysis to continue beyond the point of peak failure load. The model was able to accurately simulate the load-deflection behavior of most of the SBST specimens aged under various hygrothermal and synergistically applied stress conditions. Further, the effect of displacement rate on ILSS of specimens was studied using NOVA-3D. A PC based life prediction software, Composite Performance Predictive Tool (CPPT), was developed using a mechanism-based degradation model in order to predict the life of a composite structure under given environmental and loading conditions. The software was benchmarked using the test data.
Download or read book Characterization and Modeling of the Effect of Environmental Degradation on Interlaminar Shear Strength of Carbon epoxy Composites written by Srikanth Goruganthu and published by . This book was released on 2008 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Environmental Degradation of Interlaminar Shear Strength in Carbon epoxy Composites written by and published by . This book was released on 2012 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modeling of the Impact Response of Fibre Reinforced Composites written by Eng Sci Dept/U and published by CRC Press. This book was released on 2020-08-18 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book summarises the development of experimental techniques for determining the impact mechanical properties of fibre reinforced epoxy laminates, and the experimental results obtained for the tensile, compressive and interlaminar shear properties of various epoxy laminates.
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 974 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Investigation of the Interaction of Moisture Low Temperature and Low Level Impact on Graphite Epoxy Composites written by K. N. Lauraitis and published by . This book was released on 1980 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Modeling of the Impact Response of Fibre Reinforced Composites written by Eng Sci Dept/U and published by CRC Press. This book was released on 2020-08-18 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book summarises the development of experimental techniques for determining the impact mechanical properties of fibre reinforced epoxy laminates, and the experimental results obtained for the tensile, compressive and interlaminar shear properties of various epoxy laminates.
Download or read book Experimental and Theoretical Studies on the Interlaminar Shear Strength of Graphite Fiber epoxy Composites Exposed to Ionizing Radiation written by Jong Shin Park and published by . This book was released on 1988 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Characterization and Modeling of the Effect of Environmental Degradation on Flexural Strength of Carbon epoxy Composites written by Sneha Anil Chawla and published by . This book was released on 2010 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt: A mechanism-based modeling methodology has developed for prediction of long-term durability of composites for emerging facilities in different climatic zones. The objective of the research was to develop a predictive tool using the Arrhenius principles adapted to the TTS (Time Temperature Superposition) to measure degradation of carbon-fiber/epoxy composite under hygrothermal exposure and applied tensile stress. The hygrothermal conditions capture the synergistic effects of field exposure and extreme temperatures, viz., hot/dry, hot/wet, cold/dry, and cold/wet. Short term tests were performed to determine the flexural strength of environmentally aged composite specimens in accordance with ASTM D2344-84 and ASTM D7264 respectively. Carbon/epoxy specimens of [02/902]2s configuration were manufactured for flexure tests using Vacuum Assisted Resin Transfer Molding (VARTM). A unique strain fixture was designed to apply constant strain on the specimens during ageing and applied a simple methodology to eliminate excessive creep in the specimens. A two-dimensional cohesive layer constitutive model with a cubic traction-separation law has being developed in order to predict the life of the composite under hygrothermal conditions. The model simulated the test conditions and predicted the progressive failure mechanism of the specimen as observed in the tests, under various loading conditions. The model also incorporated synergistic interactions between temperature, moisture and stress effects and predicted degradation in strength and stiffness as a function of different ageing conditions and ageing times. Model predictions have been benchmarked using test data.
Download or read book ICCS19 19th International Conference on Composite Structures written by Antonio J.M. Ferreira and published by Società Editrice Esculapio. This book was released on 2016-08-01 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nowadays, it is quite easy to see various applications of fibrous composites, functionally graded materials, laminated composite, nano-structured reinforcement, morphing composites, in many engineering fields, such as aerospace, mechanical, naval and civil engineering. The increase in the use of composite structures in different engineering practices justify the present international meeting where researches from every part of the globe can share and discuss the recent advancements regarding the use of standard structural components within advanced applications such as buckling, vibrations, repair, reinforcements, concrete, composite laminated materials and more recent metamaterials. For this reason, the establishment of this 19th edition of International Conference on Composite Structures has appeared appropriate to continue what has been begun during the previous editions. ICCS wants to be an occasion for many researchers from each part of the globe to meet and discuss about the recent advancements regarding the use of composite structures, sandwich panels, nanotechnology, bio-composites, delamination and fracture, experimental methods, manufacturing and other countless topics that have filled many sessions during this conference. As a proof of this event, which has taken place in Porto (Portugal), selected plenary and keynote lectures have been collected in the present book.
Download or read book Modeling of the Impact Response of Fibre Reinforced Composites written by Eng Sci Dept/U and published by CRC Press. This book was released on 1991-01-01 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book summarises the development of experimental techniques for determining the impact mechanical properties of fibre reinforced epoxy laminates, and the experimental results obtained for the tensile, compressive and interlaminar shear properties of various epoxy laminates.
Download or read book Kinetics of Environmental Degradation in Graphite Epoxy Laminates written by LW. Crane and published by . This book was released on 1975 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: A detailed study of the kinetics of environmental degradation in graphite-epoxy composites show a close correlation between analytical predictions and experimentally observed changes in interlaminar shear and fracture energy response under high moisture exposure conditions. Unaged composite specimens exhibit high interlaminar shear strength ?b ? 850 kg/cm2 (12 000 psi) and relatively low fracture energy Wb/A ? 10 to 20 kg cm/cm2 (56 to 112 lb in./in.2). Exposure to 95 percent relative humidity or water immersion at 100°C (212°F) for times t ? 200 h produces a 30 to 50 percent reduction in ?b accompanied by a concurrent two to fivefold increase in Wb/A and acoustic energy absorption. These property changes are shown to be irreversible and directly related to cumulative moisture degradation of the fiber-matrix interfacial bond. The magnitudes of these property changes are consistent with surface energy analysis and micromechanics predictions.
Download or read book Long term Environmental Effects and Flight Service Evaluation of Composite Materials written by Howard Benson Dexter and published by . This book was released on 1987 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physico mechanical Characterization of T700 Based Carbon epoxy Systems for Infrastructure Rehabilitation written by Araceli Del Carmen Abanilla and published by . This book was released on 2004 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Molecular Simulation Investigations of Property Degradation in CFRP Composite written by Lik-ho Tam and published by Springer Nature. This book was released on 2024 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is written by a group of researchers based on the recent research progress in the fiber/matrix interface degradation under various environmental exposures via molecular dynamics simulation. It provides systematic framework of the model development, simulation techniques, and simulation results and presents the future research directions for investigating the interfacial degradation. By introducing the molecular details of fiber/matrix interface under environmental effects, it advances the fundamental understanding of the interfacial degradation mechanism. Researchers, scientists and engineers in the field of civil engineering and composite materials can benefit from the book. In conclusion, this book provides a computational paradigm and valuable insights on the fundamental interfacial degradation mechanism, which can contribute to the prediction of long-term behavior of fiber-reinforced polymer composites in harsh environments and pave the way for the material design with stronger interface.
Download or read book Improving the Interlaminar Shear Strength of Carbon Fiber epoxy Composites Through Carbon Fiber Bromination written by and published by . This book was released on 1987 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
