On Extension-Shearing Bending-Twisting coupled laminates

York, Christopher; Almeida, Sérgio Frascino Müller de

doi:10.1016/j.compstruct.2016.12.041

Cited by 24 publications

(22 citation statements)

References 13 publications

(16 reference statements)

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“…Recent research has led to laminate design databases containing Extension-Shearing [1] and/or Bending-Twisting coupling [2]. The results have demonstrated that the design spaces contain predominantly non-symmetric stacking sequences.…”

Section: Introductionmentioning

confidence: 99%

Effect of bending-twisting coupling on the compression and shear buckling strength of infinitely long plates

York

Almeida

2018

Composite Structures

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This article describes the development of closed form polynomial equations for compression and shear buckling to assess the effect of Bending-Twisting coupling on infinitely long laminated plates with simply supported edges. The equations are used to generate contour maps, representing non-dimensional buckling factors, which are superimposed on the lamination parameter design spaces for laminates with standard ply orientations. The contour maps are applicable to two recently developed databases containing symmetric and non-symmetric laminates with either Bending-Twisting or Extension-Shearing Bending-Twisting coupling. The contour maps provide new insights into buckling performance improvements that are non-intuitive and facilitate comparison between hypothetical and practical designs. The databases are illustrated

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Section: Introductionmentioning

confidence: 99%

Effect of bending-twisting coupling on the compression and shear buckling strength of infinitely long plates

York

Almeida

2018

Composite Structures

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“…The theory behind the algorithm used to generate the designs presented here is given elsewhere [9,10,11,12] for each of the 4 laminate classes. Only a summary is therefore provided here, together with details on how the previous derivation for UD laminates has been modified for the purposes of laminates with new NCF architectures.…”

Section: Derivation Of Stacking Sequence Datamentioning

confidence: 99%

“…Extension-Shearing and Bending-Twisting coupled laminates satisfy the following nondimensional parameter criteria [12]:…”

Section: Derivation Of Non-dimensional Parametersmentioning

confidence: 99%

“…The extent to which tapered laminate designs can be achieved, without introducing unwanted thermo-mechanical coupling, was also investigated through a layer termination algorithm to introduce single-layer [8] or, where necessary, multiple-layer terminations [4,7]. This research followed related studies on laminate design for uni-directional (UD) fibre architectures for fully uncoupled laminates [9], and those with Extension-Shearing [10] and/or Bending-Twisting coupling [11,12].The results presented in this article investigate these four laminate classes constructed from the new NCF architectures, see Fig. A1 of the electronic annex.…”

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confidence: 99%

“…However, the limited number of designs for UD material, which are further reduced in the NCF designs of Tables 2 and 3, necessitates the use of Extension-Shearing and Bending-Twisting coupled designs, as previously considered by Baker[21]. The effect on buckling strength of Bending-Twisting coupling is discussed elsewhere[11,12,15], but detrimental effects can be eliminated to a large extent my minimizing D c   . Such designs are readily determined from the lamination parameter design spaces.…”

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Tapered laminate designs for new non-crimp fabric architectures

York

Almeida

2017

Composites Part A: Applied Science and Manufacturing

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Non-Crimp Fabric (NCF) materials are now available in a range of areal weights and layer architectures, including 0/45, 0/-45, 45/-45 and 0/90, which correspond to the standard ply orientations employed in traditional UD material lay-ups.The benefit of NCF material is generally associated with increased deposition rate, but this advantage may be offset by reduced design freedoms when a specific form of mechanical coupling behaviour is required, layer terminations must be introduced and/or thermal warping distortion eliminated.This article investigates the extent to which new NCF architectures can be tailored to achieve warp free tapered laminates with mechanical Extension-Shearing Bending-Twisting couplings, by single axis (longitudinal) deposition of all ply angles; thus avoiding ply discontinuities that may be introduce in large component manufacture.Lamination parameter design spaces are used to demonstrate the extent of the feasible solutions both before and after applying a laminate tapering scheme. 2 IntroductionDesign issues associated with tapered composite laminates have been comprehensively reviewed in a number of articles [1,2]. These reviews reveal an extensive literature, focussing primarily on delamination initiation and propagation in the region of ply terminations, but also reveal that little attention has been given to the extent to which plies may be dropped without introducing thermal warping distortion and associated changes in mechanical coupling characteristics. Indeed, current tapering schemes tend to consider only short ramps or pad-ups, and few [3] consider thermal warping and the associated locked in stresses. By contrast, tapering schemes for continuous wing or fuselage panel construction, in which only single ply terminations may be necessary between adjacent ribs or ring stiffeners, to satisfy strength and/or buckling constraints, are currently restricted to balanced and symmetric laminate designs. Hence, with few exceptions [4], such designs generally require a minimum of 4 ply terminations to avoid introducing thermal warping distortions; their inherent mechanical Bending-Twisting coupling characteristics can also lead to significant reductions in the compression buckling strength [5]. New joint requirements for aero-elastic tailoring and more efficient manufacturing of composite wing or winglet construction requires a more considered tapering scheme, which has resulted in the recent development of bi-angle non-crimp fabrics (NCF) architectures, consisting of two plies of UD material, one at 0° and the other at either a shallow angle,   20°, or the standard 45° angle, stitched together. The repeating biangle [/0]rT NCF concept [6] has the potential to reduce wet lay-up times by half, in comparison to traditional UD tape. In what follows, a layer (of NCF material) contains 2 plies (of UD material). Ply terminations can also be applied to any layer without 3 changing the Extension-Shearing and Bending-Twisting dominant mechanical coupling, necessary for aero-elastic tailoring of wi...

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On the homogenization of a laminate beam under transverse loading: extension of Pagano’s theory

Subramanian

Mulay

2020

Acta Mech

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On Extension-Shearing Bending-Twisting coupled laminates

Abstract: This article presents details of the development of a special class of laminate,

Cited by 24 publications

References 13 publications

Effect of bending-twisting coupling on the compression and shear buckling strength of infinitely long plates

Effect of bending-twisting coupling on the compression and shear buckling strength of infinitely long plates

Tapered laminate designs for new non-crimp fabric architectures

On the homogenization of a laminate beam under transverse loading: extension of Pagano’s theory

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