Shape Instabilities in Composites Resulting from Laminate Anisotropy

Radford, Donald W.; Diefendorf, R. J.

doi:10.1177/073168449301200104

Cited by 92 publications

(50 citation statements)

References 2 publications

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“…Studying changes of mechanical properties in composite materials in order to better understand the residual stresses and resulting distortion in composite parts is important [4,16,17,[25][26][27][28][29][30][31][32][33][34]. Knowledge of the mechanical properties variation in a composite part makes it possible to estimate the residual stresses developed during the curing of the part.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

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Experimental and numerical study of distortion in flat, L‐shaped, and U‐shaped carbon fiber–epoxy composite parts

Roozbehjavan

Tavakol

Ahmed

et al. 2014

J of Applied Polymer Sci

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In this study, flat composite panels were fabricated to find the effect of different manufacturing parameters, including stacking sequence, part thickness, and tooling material, on distortion of carbon fiber‐epoxy composite parts. L‐shaped and U‐shaped panels were also made to investigate the effect of stacking sequence on spring‐in angle and warpage of the curved panels. Results showed that distortion of the flat panels caused by asymmetry in the stacking sequence was an order of magnitude greater than distortion of the panels with an unbalanced stacking sequence; whereas in the curved panels, the panel with an asymmetric stacking sequence showed the least spring‐in angle, and the largest angle was observed in the symmetric panel. MSC Marc was used to predict distortion of the panels, and the simulation results were compared with the experimental results for several stacking sequences of the flat and the L‐shaped panels. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40439.

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Section: Mechanical Propertiesmentioning

confidence: 99%

“…Consequently, the residual stresses are developed and lead to the distortion of the part [29,42]. Figure 13 shows the uneven resin distribution in a composite part.…”

Section: Resin Flowmentioning

confidence: 99%

Experimental and numerical study of distortion in flat, L‐shaped, and U‐shaped carbon fiber–epoxy composite parts

Roozbehjavan

Tavakol

Ahmed

et al. 2014

J of Applied Polymer Sci

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“…The spring-in has been extensively studied by analytical modelling [2] performed an elastic analysis of the residual stresses in a thermoset matrix composite. Radford and Diefendorf [3] developed a simple mathematical formula to predict the spring-in of curved shaped Letter parts. Yoon and Kim [4] developed a computational method by applying the characterized properties to the classical lamination theory.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity Analysis for the Spring-in of Composite Shells

Dong

2011

Advanced Composites Letters

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Composite materials are a class of engineering materials widely used in a wide range of industries. Spring-in is a common dimensional variation of composite shells. It is well known that spring-in is dependent on many factors e.g. the constituent properties and coefficients of thermal expansion (CTE). A sensitivity analysis on the spring-in is presented in this paper. The sensitivities of the spring-in to the constituent properties and CTE are studied by the Design of Experiments (DOE) and the Response Surface Method (RSM). It is shown that the spring-in is predominantly sensitive to the Poisson's ratio of the matrix and the transverse CTE of the fibres. The results can be used to estimate the uncertainty of the spring-in from the uncertainties of the constituent properties and CTE, which is potentially useful for the design of composite products with improved dimensional control.

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“…Hahn and Pagano [4] performed an elastic analysis of the residual stresses in a thermoset matrix composite. Radford and Diefendorf [5] developed a simple mathematical formula to predict the spring-in of curved shaped parts, which was used by Huang and Yang [6] in their experimental studies. Kollar [7] presented an approximate analysis of springin.…”

Section: Introductionmentioning

confidence: 99%

Modeling the process-induced dimensional variations of general curved composite components and assemblies

Dong¹

2009

Composites Part A: Applied Science and Manufacturing

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Dimensional variations are induced during the processing of composite materials. General curved components are commonly used in composite structures. Their performance is affected by the dimensional variations associated with the manufacturing process. This paper presents a piecewise approach for predicting the dimensional variations of general curved composite components and assemblies. For a general curved composite component, it is first divided into a number of pieces of simple geometry. For each piece, the dimensional variation, i.e. spring-in, is calculated using the effective coefficients of thermal expansion. Based on the dimensional variation of each piece, the dimensional variations of the general curved component are calculated sequentially. This approach was validated against the finite element analysis. It shows that it offers excellent accuracy while avoiding time-consuming numerical computations. Besides general curved components, this approach can also be applied to composite assemblies. It provides the foundation for the tolerance analysis/synthesis of composites.

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Shape Instabilities in Composites Resulting from Laminate Anisotropy

Cited by 92 publications

References 2 publications

Experimental and numerical study of distortion in flat, L‐shaped, and U‐shaped carbon fiber–epoxy composite parts

Experimental and numerical study of distortion in flat, L‐shaped, and U‐shaped carbon fiber–epoxy composite parts

Sensitivity Analysis for the Spring-in of Composite Shells

Modeling the process-induced dimensional variations of general curved composite components and assemblies

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