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Monday, July 27, 2020 | History

3 edition of Indentation-flexure and low-velocity impact damage in graphite/epoxy laminates found in the catalog.

Indentation-flexure and low-velocity impact damage in graphite/epoxy laminates

Indentation-flexure and low-velocity impact damage in graphite/epoxy laminates

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Published by National Aeronautics and Space Administration, Langley Research Center, National Technical Service, distributor in Hampton, Va, [Springfield, Va .
Written in English

    Subjects:
  • Laminated materials.

  • Edition Notes

    Other titlesIndentation flexure and low velocity impact ....
    StatementYoung S. Kwon and Bhavani V. Sankar.
    SeriesNASA contractor report -- 187624., NASA contractor report -- NASA CR-187624.
    ContributionsSankar, Bhavani V., Langley Research Center.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15372975M

      In this study, both static indentation-flexure and low-velocity impact tests were carried out on graphite/PEEK laminates. The internal damage, assessed by means of a range of techniques (X-radiography, ultrasonics, deply, optical microscopy), was related to the absorbed energy as obtained by instrumented testing.   Prediction of low-velocity impact damage in thin circular laminates. Effect of laminate parameters on penetration of graphite/epoxy composites. International Journal of Impact Engineering, Vol. 21, No. Estimation of low-velocity impact damage in laminated composite circular plates using nonlinear finite element by:

    In the current paper, a 3D damage and failure model of composite laminates subjected to low-velocity impact damage is described. The modelling of impact damage and its validation for IM7/PEEK laminate composite plate are presented. 2 IMPACT DAMAGE MODEL To capture the effects of progressive damage and failure on laminated composite structures.   The paper presents recent progress on modelling low velocity impact induced damage in fibre reinforced composite laminates. It is important to understand the mechanisms of barely visible impact damage (BVID) and how it affects structural performance. To reduce labour intensive testing, the development of finite element (FE) techniques for simulating impact damage becomes essential and Cited by: 8.

    Low-velocity non-penetrating impact has been applied to graphite polyetheretherketone (AS4/APC-2) laminates in accordance with the USAF guidelines for designing damage tolerant primary structures. The extent of delaminations and dent depths for two lay ups and five thicknesses at room temperature and ambient moisture conditions have been. Get this from a library! Acoustic emission monitoring of low velocity impact damage in graphite/epoxy laminates during tensile loading. [Bradford H Parker; United States. National Aeronautics and Space Administration. Scientific and Technical Information Program.].


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Indentation-flexure and low-velocity impact damage in graphite/epoxy laminates Download PDF EPUB FB2

Static indentation-flexure and low-velocity impact tests were performed on quasi-isotropic and cross-ply graphite/epoxy composite laminates. The load-deflection relations in static tests and impact. Get this from a library. Indentation-flexure and low-velocity impact damage in graphite/epoxy laminates.

[Young S Kwon; Bhavani V Sankar; Langley Research Center.]. Static indentation-flexure and low-velocity impact tests were performed on quasi-isotropic and cross-ply graphite/epoxy composite laminates. The load-deflection relations in static tests and impact force history in impact tests were recorded.

The damage was assessed by using ultrasonic C-scanning and photo-micrographic by: INDENTATION-FLEXURE AND LOW-VELOCITY IMPACT DAMAGE IN GRAPHITE/EPOXY LAMINATES Young S. Kwon and Bhavani V. Sankar UNIVERSITY OF FLORIDA Gainesville, Florida Grant NAG March National Aeronautics and Space Administration LANGLEY RESEARCH CENTER Hampton, Virginia (NASA-CR-ldTbZ_) INOENTATION-FLEXURE ANDFile Size: 3MB.

Static indentation-flexure and low-velocity impact tests were performed on quasi-isotropic and cross-ply graphite/epoxy composite laminates. The load-deflection relations in static tests and impact force history in impact tests were recorded.

The damage was assessed by using ultrasonic C-scanning and photo-micrographic : Bhavani V. Sankar and Young S.

Kwon. Static indentation and low velocity impact tests were performed on quasi-isotropic and cross ply graphite/epoxy composite laminates. The load deflection relations in static tests and impact force history in the impact tests were recorded. The damage was assessed by using ultrasonic C-scanning and photomicrographic : Young S.

Kwon and Bhavani V. Sankar. Sankar et al. investigated the effect of initial tensile stress on the low-velocity impact behaviour of graphite–epoxy laminates.

The results show that there is a critical velocity for the initiation of impact damage. It is observed that in the prestressed samples this velocity is lower, but beyond a certain impact velocity, tensile prestresses may reduce the rise of delamination by: 2.

"Damage Evolution in Stitched and Unstitched Graphite/Epoxy Laminates Subject to Low-Velocity Impact." Proceedings of the ASME 8th Biennial Conference on Engineering Systems Design and Analysis. Volume 3: Dynamic Systems and Controls, Symposium on Design and Analysis of Advanced Structures, and : Francesco Aymerich, Pierluigi Priolo.

Composite laminates are susceptible to transverse loads such as low-velocity impact. Under low-velocity impact, the impact-induced damage may be barely visible on the surface of the laminates, but it can considerably reduce their in-plane compressive strength [1].

Several studies show a similarity between quasi-static indentation (QSI) and low. In this investigation, glass-epoxy laminated plates were subjected to crush experimental tests in a SHIMATSU universal traction machine and low-velocity crash impact tests in a drop test IMATEK machine.

The results are shown and the dimensions of the damage are evaluated. The characterization of the damage is done in relation to the type of test, the ply stacking sequence, the Cited by: CONCLUSIONS Low velocity impact damage in sandwich beams consisting of AS graphite/epoxy compo- site laminate face sheets and Rohacell foam core was investigated.

The major modes of damage included matrix cracking and delamina- tion in the face laminate and yielding (crushing) in the by: Transient response of graphite/epoxy and Kevlar/epoxy laminates subjected to impact. Low-velocity impact responses of the stiffened composite laminated plates based on the progressive failure model and the layerwise/solid-elements method.

Damage Resistance of Graphite/Epoxy Sandwich Panels Under Low Speed by:   Analysis of damage zones in graphite-epoxy laminates in low-velocity impact. “Dynamic delamination fracture toughness of a graphite/epoxy laminate under impact,” Composites Sci. Technol.,31, 55–72 Yarve, É.V.

Analysis of damage zones in graphite-epoxy laminates in low-velocity impact. Mech Compos Ma – Cited by: 6.

Acoustic emission monitoring of low velocity impact damage in graphite/epoxy laminates during tensile loading (SuDoc NAS ) [Parker, Bradford H.] on *FREE* shipping on qualifying offers. Acoustic emission monitoring of low velocity impact damage in graphite/epoxy laminates during tensile loading (SuDoc NAS )Author: Bradford H.

Parker. Delamination threshold loads for low velocity impact on composite laminates Article (PDF Available) in Composites Part A Applied Science and Manufacturing 31(9) September with. A model for predicting damage in graphite/epoxy laminated composites resulting from low velocity point impact.

J Compos Mater ;– has been cited by the following article: TITLE: Interlaminar Fracture Toughness and Low-Velocity Impact Resistance of Woven Glass Epoxy Composite Laminates. Kwon, YS, Bhavani, V, Sankar, B. Indentation-flexure and low-velocity impact damage in graphite epoxy laminates.

J Compos Technol Res ; 15(2): – Google ScholarCited by: Y.S. Kwon and B.V. Sankar () "Indentation-Flexure and Low-Velocity Impact Damage in Graphite/Epoxy Laminates", NASA Contractor Report Other Reports.

A Beam Theory for Laminated Composites and Application to Torsion Problems, Report AeMES TR, MAE-A Building, University of Florida, Gainesville, FL ; Books Edited.

@article{osti_, title = {Quantitative validation of carbon-fiber laminate low velocity impact simulations}, author = {English, Shawn A. and Briggs, Timothy M. and Nelson, Stacy M.}, abstractNote = {Simulations of low velocity impact with a flat cylindrical indenter upon a carbon fiber fabric reinforced polymer laminate are rigorously validated.

The low-velocity impact response of a hybrid titanium composite laminate, known as TiGr ⁠, was compared to that of graphite/epoxy TiGr material comprised of two outer plies of titanium foil surrounding a composite core.

The composite core was PIXA-M (a high temperature thermoplastic) reinforced by IM-6 graphite fibers and consolidated by an induction heating by:. The two GFRPs laminates show similar mode II delamination resistance.

At impact velocities between and m/sec, the GFRP developed a smaller damage size than the graphite-based GFRP laminates, indicating higher impact toughness. Difference of the impact resistance between the two GFRPs is mainly on the impact damage size by: 4.Understanding the failure behaviour of composite laminate is crucial in designing a reliable composite structure.

Failure analyses have been carried out widely. Nevertheless, the composite laminate displacements before the occurrence of failure have not been analysed thoroughly, especially when comparing between Glass/Epoxy and Graphite/Epoxy, which are the two most common composite by: 3.Kwon, Y.S., and Sankar, B.V., “Indentation-Flexure and Low-Velocity Impact Damage in Graphite Epoxy Laminates,” Journal of Composites Technology and Research, Vol.

15, No. 2,pp. – Sharma SK, Sankar BV, Effect of through–the-thickness stitching on impact .