Finite-Displacement Analysis of Laminated Composite Strips with Extension-Twist Coupling

Armanios, Erian A.; Makeev, Andrew; Hooke, David

doi:10.1061/(asce)0893-1321(1996)9:3(80)

Cited by 43 publications

(13 citation statements)

References 6 publications

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“…Antisymmetric layups produce laminates with extension-twist coupling; the nonlinear coupling between extension and twist is one of the predominant nonlinear effects of the present analysis. Secondly, experimental and theoretical results are available for this specialized case from Armanios et al (1996), enabling partial validation of the present theory.…”

Section: Extension-twist In Initially Twisted Antisymmetric Laminatesmentioning

confidence: 97%

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Nonlinear Composite Beam Theory

Hodges¹

2006

366

284

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Section: Extension-twist In Initially Twisted Antisymmetric Laminatesmentioning

confidence: 97%

“…The laminates considered by Armanios et al (1996) were fabricated from ICI Fiberite T300/954-3 Graphite/Cyanate prepreg material using the stacking sequence…”

Section: Extension-twist In Initially Twisted Antisymmetric Laminatesmentioning

confidence: 99%

Nonlinear Composite Beam Theory

Hodges¹

2006

366

284

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“…*dinesh@aero.iisc.ernet.in, Phone: +91-80-22933032, Fax: +91-80-23600134 For a healthy antisymmetric strip the analytical relationship between the tip axial force and the twist is provided by Hodges et al [5] using variational asymptotic method. For initially flat laminates, the same expression is obtained by Armanios et al [6] using finite difference method. This expression is found to be applicable even to the delaminated specimens used in the current work by neglecting the delaminated portion and considering only length of the healthy portion.…”

Section: Introductionmentioning

confidence: 56%

Macro-fiber composite (MFC) as a delamination sensor in antisymmetric laminates

Krishna

Harursampath

2006

SPIE Proceedings

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The change in extension-twist coupling due to delamination in antisymmetric laminates is experimentally measured. Experimental results are compared with the results from analytical expression existing in literature and finite element analysis. The application of the Macro-Fiber Composite (MFC) developed at the NASA Langley Research Center for sensing the delamination in the laminates is investigated. While many applications have been reported in the literature using the MFC as an actuator, here its use as a twist sensor has been studied. The real-life application envisaged is structural health monitoring of laminated composite flexbeams taking advantage of the symmetry in the structure. Apart from the defect detection under symmetric conditions, other methods of health monitoring for the same structure are reported for further validation. Results show that MFC works well as a sensor.

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“…The laminated composite strip of bar 1 is similar to that considered by Armanios et al [17] and was fabricated from the ICI Fiberite T300/954-3 Graphite/Cyanate material system, whereas the laminated composite strips of bars 2 and 3 are similar to those considered by Kosmatka [18] and were made from the T300/5208 Graphite/Epoxy material system. The stacking sequence ½20 2 =À70 4 =20 2 =À20 2 =70 4 =À20 2 T is used for bars 1 and 3 whereas for bar 2 it is ½20=À70 2 =20=À20=70 2 =À20 T .…”

Section: Numerical Results and Discussionmentioning

confidence: 99%