Laminate design for optimised in-plane performance and ease of manufacture

Nielsen, Mark W.D.; Johnson, Kevin; Rhead, Andrew; Butler, Richard

doi:10.1016/j.compstruct.2017.06.061

Cited by 18 publications

(8 citation statements)

References 14 publications

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“…Extensional stiffness is readily calculated for any laminate configuration by simply observing the proportion of ply angles, or ply percentages [6] in each of the four principal directions. In other words, the stacking sequence does not need to be defined, a priori.…”

Section: Stiffness Tailoringmentioning

confidence: 99%

“…A technique for extensional stiffness matching between standard and double angle-ply laminates [5,6] also permits like-with-like comparisons, based on ply percentages commonly used in the design process for aircraft components. However, little consideration has previously been given to bending stiffness [7], which has a significant influence on buckling performance.…”

Section: Introductionmentioning

confidence: 99%

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Laminate stiffness tailoring for improved buckling performance

York

2021

Thin-Walled Structures

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Section: Stiffness Tailoringmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Laminate stiffness tailoring for improved buckling performance

York

2021

Thin-Walled Structures

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“…Ply percentages are often used to account for design uncertainties relating to in-plane properties [7] and can be readily applied to the associated in-plane lamination parameter design space [14]. However, the effect of these constraints on the bending stiffness properties have not previously been investigated.…”

Section: Effect Of Design Heuristics On the Lamination Parameter Design Spacementioning

confidence: 99%

Compression and shear buckling performance of finite length plates with bending-twisting coupling

Lee

York

2020

Composite Structures

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This article investigates the compression and shear buckling performance of finite lengthBending-Twisting coupled laminated plates with simply supported edges. New contour maps are developed, representing non-dimensional buckling factors, which are superimposed on the lamination parameter design spaces for laminates with standard ply orientations. Changes in buckling mode for finite length plates complicate the contour maps, which are shown to be continuous only within discrete regions of the lamination parameter design space and are strongly influenced by plate aspect ratio. The contour maps also serve to demonstrate the degrading effect of Bending-Twisting coupling on compression buckling performance as well as providing new insights into shear buckling performance improvements, including optima that are non-intuitive. The adoption of two recently developed laminate databases, to which common design rules are now applied, including ply percentages and ply contiguity constraints, ensure that the conclusions drawn are based on practical rather than hypothetical designs.

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“…2) and deriving identical equations as (3) but with different sample dimensions. Given that we know the intra-ply shear moduli G ply and η ply from the single ply analysis, we can rearrange (5) to calculate the intra-ply shear stiffness…”

Section: Bending Of a Laminate -Mixed Inter And Intra-ply Shearmentioning

confidence: 99%

“…During the forming [1], consolidation and curing processes [3,4], the layers within the laminate shear internally (and therefore bend) relative to one another as the laminate conforms to desired shape [3]. The quality of the as-manufactured part intricately depends on the overall shearing mechanics of the laminate relative to geometry of the tool [5,1]. If these shearing mechanisms are constrained a variety of defects can form, [6], in particular out-of-plane wrinkling defects [3,4] and bridging [7,8].…”

Section: Introductionmentioning

confidence: 99%

Characterisation of bending mechanics in uncured laminated materials using a modified Dynamic Mechanical Analysis

Erland,

Dodwell,

Butler

2017

Preprint

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Understanding the bending mechanics of uncured carbon fibre prepreg is vital for modelling forming processes and the formation of out-of-plane wrinkling defects. This paper presents a modification of standard Dynamic Mechanical Analysis (DMA) to characterise the viscoelastic bending mechanics of uncured carbon fibre prepreg using Timoshenko beam theory. By post-processing DMA results, the analysis provides temperature and rate-dependent values of inter and intra-ply shear stiffness for a carbon fibre laminate and each individual ply with experimental results for AS4/8552 presented. The new methodology provides a means to parametrise process models, and also gives an indication of optimal manufacturing conditions to enable defect-free forming and consolidation processes.

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Laminate design for optimised in-plane performance and ease of manufacture

Cited by 18 publications

References 14 publications

Laminate stiffness tailoring for improved buckling performance

Laminate stiffness tailoring for improved buckling performance

Compression and shear buckling performance of finite length plates with bending-twisting coupling

Characterisation of bending mechanics in uncured laminated materials using a modified Dynamic Mechanical Analysis

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