Delamination Failure Modes in Filament Wound Composite Tubes PDF Download

Author: Donald Robert Gilbreath
Publisher:
ISBN:
Category :
Languages : en
Pages : 126

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Author: RF. Foral
Publisher:
ISBN:
Category : Composite materials
Languages : en
Pages : 13

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Book Description
Filament-wound composite tubes of helical hoop construction were tested in axial tension at room temperature and at elevated temperatures. Stress analysis of such tubes shows the presence of tensile interlaminar stresses, tending to produce delamination. The test results show that delamination failures do occur, and that material performance depends on laminate stacking sequence as well as test temperature. In specimens with no inside hoop layers, the tensioned inside helical fibers pulled away from the laminate in a localized delamination failure mode, called transverse fiber pullout. The predicted interlaminar stresses at which this occurred are considerably lower than the expected through-the-thickness strength. The interlaminar stresses producing these failures must be accounted for in design of curved laminates, because they can produce premature failure at a load level substantially below that predicted by in-plane analysis.

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 271

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Book Description
Several fundamental problems associated with the mechanical behavior and failure of filament-wound composite structures are studied. Available experimental results on pressure testing of filament-wound composite tubes are analyzed to formulate the incremental constitutive relations of a filament layer under deformations with a large shear strain, and to correlate the intrinsic strain paths preceding the failure of the filament layer with the various failure modes of the structure. Implication of the results to the analysis of filament-wound structures is described. Micromechanical analyses using the boundary element method are conducted to determine the composite gross elastic moduli in terms of the constituent properties, and to study the fracture mechanics problems associated with fiber-matrix debonding and oblique matrix crack between adjacent fibers. Analytical models of delamination failure in filament-wound structures and composite laminates are proposed and the separation and postbuckling problems of helical and two-dimensional delaminations are extensively investigated. A variational method using stress functions is developed to obtain efficient and accurate solutions of free-edge interlaminar stresses in composite structures.

Author: H. Thomas Hahn
Publisher: ASTM International
ISBN: 0803111908
Category : Composite materials
Languages : en
Pages : 421

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Book Description
Annotation Proceedings of a symposium on [title] held April 1987, Cincinnati, OH. The majority of papers deal with composite systems of thermosetting epoxies. Some attention is given to more recent thermoplastic systems. Annotation copyrighted by Book News, Inc., Portland, OR.

Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 836

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Author: Emile Greenhalgh
Publisher: Elsevier
ISBN: 1845696816
Category : Technology & Engineering
Languages : en
Pages : 608

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Book Description
The growing use of polymer composites is leading to increasing demand for fractographic expertise. Fractography is the study of fracture surface morphologies and it gives an insight into damage and failure mechanisms, underpinning the development of physically-based failure criteria. In composites research it provides a crucial link between predictive models and experimental observations. Finally, it is vital for post-mortem analysis of failed or crashed polymer composite components, the findings of which can be used to optimise future designs.Failure analysis and fractography of polymer composites covers the following topics: methodology and tools for failure analysis; fibre-dominated failures; delamination-dominated failures; fatigue failures; the influence of fibre architecture on failure; types of defect and damage; case studies of failures due to overload and design deficiencies; case studies of failures due to material and manufacturing defects; and case studies of failures due to in-service factors.With its distinguished author, Failure analysis and fractography of polymer composites is a standard reference text for researchers working on damage and failure mechanisms in composites, engineers characterising manufacturing and in-service defects in composite structures, and investigators undertaking post-mortem failure analysis of components. The book is aimed at both academic and industrial users, specifically final year and postgraduate engineering and materials students researching composites and industry designers and engineers in aerospace, civil, marine, power and transport applications. - Examines the study of fracture surface morphologies in uderstanding composite structural behaviour - Discusses composites research and post-modern analysis of failed or crashed polymer composite components - Provides an overview of damage mechanisms, types of defect and failure criteria

Author: R. Keal
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author:
Publisher:
ISBN:
Category : Military research
Languages : en
Pages : 274

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Book Description

Author: Martin Knops
Publisher: Springer Science & Business Media
ISBN: 3540757651
Category : Technology & Engineering
Languages : en
Pages : 208

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Book Description
Written by Puck's pupil and appointed successor Martin Knops, this book presents Alfred Puck ́s failure model, which, among several other theories, predicts fracture limits best and describes the failure phenomena in FRP most realistically – as confirmed within the "World-wide Failure Exercise". Using Puck ́s model the composite engineer can follow the gradual failure process in a laminate and deduce from the results of the analysis how to improve the laminate design.

Author: M. Hinton
Publisher: Elsevier
ISBN: 0080531571
Category : Technology & Engineering
Languages : en
Pages : 1269

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Book Description
Fiber reinforced polymer composites are an extremely broad and versatile class of material.Their high strength coupled with lightweight leads to their use wherever structural efficiency is at a premium. Applications can be found in aircraft, process plants, sporting goods and military equipment. However they are heterogeneous in construction and antisotropic, which makes making strength prediction extremely difficult especially compared to that of a metal. This book brings together the results of a 12year worldwide failure exercise encompassing 19 theories in a single volume. Each contributor describes their own theory and employs it to solve 14 challenging problems. The accuracy of predictions and the performance of the theories are assessed and recommendations made on the uses of the theories in engineering design.All the necessary information is provided for the methodology to be readily employed for validating and benchmarking new theories as they emerge.Brings together 19 failure theories, with many application examples.Compares the leading failure theories with one another and with experimental dataFailure to apply these theories could result in potentially unsafe designs or over design.