Study Of The Response Of Fiber Reinforced Polymeric Composite Beam Under Dynamic Loading And Hygrothermal Sic Environment
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Study Of The Response Of Fiber Reinforced Polymeric Composite Beam Under Dynamic Loading And Hygrothermal Sic Environment
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Author : Bahubali Chandrashekar Kagi
language : en
Publisher:
Release Date : 2006
Study Of The Response Of Fiber Reinforced Polymeric Composite Beam Under Dynamic Loading And Hygrothermal Sic Environment written by Bahubali Chandrashekar Kagi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
[Author's abstract] Fiber reinforced polymeric (FRP) composites are beginning to find applications in constructing infrastructures such as bridges, railroads, etc. Composites may potentially be more durable replacements for steel and concrete, but their experience in these applications is minimal. Also, composite decks are susceptible to change in environmental conditions. Thus, the study of the behavior of composite material in elevated environmental conditions is necessary. This thesis is aimed at development and validation of Finite element methods used to analyze Fiber reinforced polymeric composite beam under moisture and elevated temperature change. The response of the composite beam subjected to various loads is analyzed under dry and moist conditions. It is assumed that only the matrix properties are adversely affected. The mechanical properties such as stiffness, strength, etc are degraded due to the combined effect of moisture and temperature change. The laminate properties are calculated using the rule of mixtures. A parametric study is carried out by varying the fiber volume fraction and by changing the fiber orientations and ply lay-ups in the laminate. From results it can be observed that the static and dynamic deflections increase due to the presence of moisture and increased temperature. The behavior of the beam is also influenced by the ply orientations and fiber volume fraction. Thus, for composite materials to reach their full potential in structural applications, it becomes quite imperative to consider factors such as moisture content, temperature, ply orientations and fiber volume during design and analysis.
Applied Mechanics Reviews
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Author :
language : en
Publisher:
Release Date : 1948
Applied Mechanics Reviews written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1948 with Mechanics, Applied categories.
International Aerospace Abstracts
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Author :
language : en
Publisher:
Release Date : 1999
International Aerospace Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Aeronautics categories.
Fiber Reinforced Polymer Strengthening Of Steel Beams
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Author : Bibek Regmi Bagale
language : en
Publisher:
Release Date : 2019
Fiber Reinforced Polymer Strengthening Of Steel Beams written by Bibek Regmi Bagale and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Finite element method categories.
Fiber reinforced polymer (FRP) strengthening has been widely used for concrete structures. However, limited studies have been conducted on FRP application to steel structures. The use of FRP materials to retrofit steel members is an effective replacement for welded or bolted steel plates and offer high strength-to-weight ratio, resilience to environmental degradation, and a robust fatigue performance. Although the application of FRP to retrofit steel structures have been on the rise in recent years, their behavior under various loading conditions have not been fully explored. The objective of this study is to analyze FRP retrofitting of steel beams using finite element analysis (FEA) modeling technique. FEA model of a steel beam strengthened with fiber reinforced polymer (FRP) laminates was developed using ANSYS Mechanical APDL finite element software program. The FEA models of steel beams subjected to monotonic static and fatigue loads were validated by comparing the FEA and experimental results of existing studies in the literature and they were in good agreement. Parametric studies were then performed on the validated models to investigate the behavior of FRP strengthened steel beams subjected to static and dynamic loadings. Under static load, damaged and undamaged steel beams were retrofitted with carbon fiber reinforced polymer (CFRP) to examine the effect of bond length and transverse anchorages on flexural behavior and failure modes. The CFRP laminate provided an increase in the flexural capacity for the undamaged and damaged beams by approximately 1.7 and 3 times respectively as compared to their counterpart control beams. The FRP laminate effective bond length under static loading condition was found to be 2/5 of the simply supported span length of the steel beam. Furthermore, with the addition of anchorages, the flexural capacity was increased by 1.5 times and the mode of failure changed from the debonding to rupture. Basalt fiber reinforced polymer (BFRP) is a newer form of FRP material which is extracted from natural sources and is considered an environment friendly option in lieu of CFRP material. BFRP application to steel beams were investigated in this study for both static and dynamic cases. Under dynamic loading, different FRP material types such as CFRP, BFRP and Aramid fiber reinforced polymer (AFRP) were studied. A regression analysis was performed to generate new S-N curves and formulas were proposed to predict the fatigue life of BFRP and AFRP strengthened steel beams.
Dynamic Response Of Polymeric Materials Subject To Extreme Environments Under Dynamic Fracture And Impact Conditions
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Author : Rodrigo Enrique Chavez Morales
language : en
Publisher:
Release Date : 2020
Dynamic Response Of Polymeric Materials Subject To Extreme Environments Under Dynamic Fracture And Impact Conditions written by Rodrigo Enrique Chavez Morales and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
Polymeric materials, in particular composite materials, have seen an increase in use in naval applications. Under these conditions, structural materials need to be able to withstand dynamic loads such as those from underwater blast and wave slamming, as well as environmental factors like moisture absorption and ultraviolet radiation. Both conditions add challenges in the design process due to complex loading conditions and change in material behavior. This dissertation presents an experimental study to understand the dynamic fracture behavior of poly(methyl methacrylate) (PMMA) and carbon fiber/epoxy. Dynamic loading was obtained by launching projectiles from a gas gun onto the specimen. A combination of ultra high-speed photography and digital image correlation was used to gather full-field experimental data. First, a methodology was established using PMMA to obtain pure mode-II fracture loading conditions. This study generated valuable experimental results, which updated current data available to the fracture community. Sharp transitions from mode-II to mode-I fracture loading were observed in addition to the effect of crack-tip sharpness and loading conditions on the crack path. Next, carbon fiber/epoxy specimens were studied after developing an experimental setup capable of obtaining dynamic mode-II loading conditions. The effect of moisture absorption on the fracture behavior of unidirectional carbon fiber/epoxy samples was studied. Two different methods were used to obtain significant moisture contents, first, samples were hygrothermally aged at 65°C for 28 days and second, submersion in room temperature distilled water for 400 days. Additionally, a control group of samples with no moisture content was used to compare results. This study determined that moisture absorption decreased the fracture toughness of the material, however no differences were observed between the different aging methods. Last, unidirectional and woven carbon fiber samples were subject to mixed mode loading. The samples were hygrothermally aged at 65°C until they achieved moisture saturation. Mixed mode loading and woven composites allowed for the opportunity to create more realistic conditions compared to unidirectional composites under pure mode-II fracture. At the same time, these changes introduced complexities at the onset of crack growth. Unlike the previous experiment, the samples showed no sensitivity to moisture.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1991
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Aeronautics categories.
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Engineered Materials Abstracts
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Author :
language : en
Publisher:
Release Date : 1995-04
Engineered Materials Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995-04 with Ceramic materials categories.
Static And Dynamic Behaviour Of Double Flax Fibre Reinforced Polymer Tube Confined Coconut Fibre Reinforced Concrete Composite
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Author : Jiaxin Chen
language : en
Publisher:
Release Date : 2015
Static And Dynamic Behaviour Of Double Flax Fibre Reinforced Polymer Tube Confined Coconut Fibre Reinforced Concrete Composite written by Jiaxin Chen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with Coconut categories.
Fibre-reinforced polymers are extensively used in the automobile and the aerospace sectors. However, because synthetic fibres are expensive, their usage in civil structures is limited to retrofitting. Steel is expensive, heavy, and subject to corrosion, thus using natural waste materials instead of steel reinforcement in civil structures will reduce the total structural mass, cost and circumvent the problem of corrosion. Because of the smaller mass and the corrosion-free materials, the composite structures are able to withstand higher dynamic loads and require less running maintenance. Utilization of natural waste based composites reduces the cost without compromising the strength of the material and thus will lead to resilient construction materials for future civil infrastructures. In this research flax fibre reinforced polymer (FFRP) and coconut fibre reinforced concrete (CFRC) are considered. FFRP is used to serve as formwork of the concrete core and to simultaneously enhance the strength of the FFRP-CFRC composite by confining the concrete core. To further reduce the mass of the structure double FFRP (DFFRP) tubes are applied. To reveal the consequence of reduced inner concrete core for the compressive and flexural behaviour of DFFRP-CFRC composite static experiments were performed. To enhance the bond strength between FFRP and CFRC mechanical profiles of the FFRP-CFRC interface was introduced. The consequence of the mechanical bond for the compressive and flexure behaviour DFFRP-CFRC composite is investigated. Push-out tests were performed to determine the bond strength between DFFRP-CFRC composite. To study the response of DFFRP-CFRC composite structures to dynamic loadings, the performance of a simple single degree-of-freedom (SDOF) structure made by FFRP-CFRC and DFFRP-CFRC composites are investigated. The dynamic properties of the structure, i.e. natural frequency and damping ratio, are obtained from free-vibration observed during snap-back tests and impact tests using a calibrated hammer . To clearly identify the relationship between DFFRP-CFRC structures and the loading characteristics harmonic loadings with different frequencies around the structural fundamental frequency are considered. In the final step the impact of earthquake ground excitations, simulated stochastically based on Japanese design spectrum, on the structures is investigated. The harmonic and earthquake loadings are simulated by a shake table.
Dynamic Response Of Doubly Tapered Laminated Composite Beams Under Periodic And Non Periodic Loadings
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Author : Pramod Kumar
language : en
Publisher:
Release Date : 2021
Dynamic Response Of Doubly Tapered Laminated Composite Beams Under Periodic And Non Periodic Loadings written by Pramod Kumar and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.
Doubly-tapered laminated composite beams provide a great opportunity to enhance capabilities such as high strength-to-weight ratio, high modulus-to-weight ratio, and design flexibility. Due to design tailoring capabilities, the use of doubly-tapered composite beams has increased in the automobile industry and aerospace industry. In the present thesis, the free and forced vibration analyses of the width-and-thickness-tapered, called herein as doubly-tapered, laminated composite beams are conducted considering different boundary conditions, taper configurations, and loadings. The exact and closed-form solutions for the mode shapes and natural frequencies of doubly-tapered composite beams could not be acquired because of the complexity of the corresponding partial differential equations. Therefore, the classical laminate theory and the one-dimensional laminated beam theory in combination with the Ritz method are used in evaluating the stiffness and mass matrices of the composite beam. The natural frequencies and the corresponding mode shapes are determined by solving the eigenvalue problem obtained using the Ritz method. The forced vibration analysis of the doubly-tapered composite beams subjected to the transverse periodic and non-periodic loadings is carried out by representing the periodic loading as the superposition of the harmonic components of various frequencies using the Fourier series expansion and by expressing the non-periodic pulse excitation as the superposition of two or more simpler functions for which solutions are easier to determine. The maximum deflection of the doubly-tapered composite beam in spatial and time coordinates is determined. Numerical and symbolic computations have been performed using MATLAB® software. The solutions to the free and forced vibration analyses of the composite beams are compared, with the solution available in the literature and with the solution based on the Finite Element Method obtained using ANSYS®, to demonstrate solution accuracy. The Rayleigh damping is considered to model the viscous damping of the composite beam. A detailed parametric study is carried out to investigate the influences of the loading components in the Fourier series expansion, loading type, period of the periodic loading, the rise and fall times of the non-periodic loadings, taper angle, width ratio, thickness ratio, laminate length, stacking sequence, and taper configuration on the forced response of the doubly-tapered composite beam considering different boundary conditions.
Retrofitting Of Composite Steel Beams Pre Damaged In Flexure Using Fiber Reinforced Polymers
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Author : Ehab Clovis Karam
language : en
Publisher:
Release Date : 2015
Retrofitting Of Composite Steel Beams Pre Damaged In Flexure Using Fiber Reinforced Polymers written by Ehab Clovis Karam and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with Carbon fiber-reinforced plastics categories.
"The demand for the use of carbon-fiber-reinforced polymer (CFRP) composite sheets and plates is exponentially increasing in the rehabilitation of deteriorating steel-concrete composite beams across the Globe. The aim of this study is to investigate the performance of pre-damaged steel-concrete composite beams retrofitted with CFRP sheets and mechanically anchored with pultruded composite plates with high stiffness and bearing strength. A total of 10 composite steel-concrete beams were prepared and tested under two-point loading till failure. One beam was left undamaged to serve as a control specimen, while the remaining beams were divided into three groups, each consisting of three specimens and artificially damaged by cutting different notch depths of 5 mm, 8 mm and 11 mm in the bottom flange simulating corrosion damage levels of 45%, 73% and 100%, respectively. In each group, the first beam was tested without strengthening, the second specimen was externally retrofitted in flexure with CFRP sheets bonded with epoxy adhesives, and the third beam was strengthened in a similar fashion and mechanically fastened using the proposed composite pultruded plate system. The test results showed that the load-carrying capacity of the deteriorated specimens with different notch depths of 5 mm, 8 mm and 11 mm was reduced by 10.57, 21.52, and 49.1%, respectively. The strength of the repaired beam specimens with CFRP sheets ranged from 74.19 to 104.48% of that of the control undamaged beam, and ranged from 77.42 to 108.06% for the beams repaired with the proposed mechanical anchorage system. It was concluded that the proposed mechanically fastened repair system could fully restore the strength of damaged steel-concrete beams if the notch size at midspan is less than 50% of the bottom flange thickness. A finite element (FE) model was also developed that accurately simulated the response of some selected specimens. The developed models can be used in a future parametric study to investigate the effect of several parameters on the performance of the proposed retrofitting system. "--Abstract.