Mixed mode embedded circular delamination propagation in spar wingskin joint made with curved FRP composite laminates
Autor: | P. K. Mishra, M.K. Pandit, A. K. Pradhan |
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Rok vydání: | 2018 |
Předmět: |
Strain energy release rate
Materials science Delamination 0211 other engineering and technologies General Engineering 02 engineering and technology Fibre-reinforced plastic Composite laminates Computer Science::Numerical Analysis Finite element method Mathematics::Numerical Analysis Computer Science Applications Stress (mechanics) Crack closure 020303 mechanical engineering & transports 0203 mechanical engineering Modeling and Simulation Composite material Joint (geology) Software 021106 design practice & management |
Zdroj: | Engineering with Computers. 35:677-685 |
ISSN: | 1435-5663 0177-0667 |
Popis: | This paper presents the mixed mode propagation of circular delamination pre-embedded at the interface of 1st and 2nd plies of wingskin adherend of the Spar Wingskin Joint made with curved fibre reinforced plastic composite panels. Three dimensional finite element analyses of these joints under uniformly applied out of plane transverse load have been carried out using contact and multi point constraint elements. The growth of embedded delamination is simulated by sequential release of the constraints of these elements ahead of the delamination front. The inter-laminar stresses and strain energy release rate values being indicative parameters in delamination growth studies are computed in the vicinity of the curved delamination fronts. These values are evaluated using virtual crack closure technique. It has been observed that the circular delamination size significantly influences the magnitudes of inter-laminar stresses and the three components of SERR values in the vicinity of delamination front. Maximum values of peel stress and mode I SERR occur at orthogonal locations to the loading direction i.e. at θ = 90° and 270° measured counter clockwise from positive X-axis along the periphery of the delamination fronts. The variations of inter-laminar stresses and the values of SERR are non-uniform along the circular delamination front indicating variable rates of propagation. This simulation procedure will be used for the assessment of loss of structural integrity of the SWJs having circular delamination when the embedded delamination undergoes propagation upon increase of loading. |
Databáze: | OpenAIRE |
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