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Finite numerical analysis of composite structure under complex loading conditions - optimal ply design of laminate

Dębski H.

Journal of KONES

2010

Vol. 17, No. 1

111-115

The paper presents FEA numerical analysis of composite structure subjected to complex loading conditions (tension and shear). The layered structures were characterized from the standpoint of optimal selection and strength parameters. The subject of the examinations was a composite: glass fibres reinforcedpolymers-M12/26%/TVR380R-glass prepreg system (Hexcel, R-glass fibres-undirectional, M12 epoxy resin). The composite system is use in helicopter blades. It exhibits good fatigue life and hot/wet performances up to 100° C. The strength properties were investigated according to ISO and ASTM standards. The composites for the study were pro duce d by autoclave technique. The Layup-Ply method with ABAQUS/Standard program was applied as an analysis tool which was carried out the leading of calculation. It was used an incremental iterative Newton-Raphson's method in a range of nonlinear geometric. Numerical calculation was made as a part of introduction to failure analysis composite materials. The risk of laminate's damage could be estimated as a possible appearing in dangerous points of construction. There were taken four criteria: the Maximum Stress Criterion, Tsai-Hill's Criterion, tensor criterion of Tsai-Wu and Azzi-Tsai-HiU's criterion.

Strength of fibrous composites with impact damage

Pavelko I. V., Pavelko V.P., Chatys R.

Prace Naukowe Politechniki Warszawskiej. Mechanika

2007

z. 219

187--198

Numerical analysis of an elastic stress state of composite at low-speed impact is carried out. The use of the general criteria of destruction can give the sufficient information for an approximate prediction of kind of partial destructions in a material and the sizes of a zone of damage. Research and use of knowledge of the phenomenon of self-supported destruction of the brittle components of a composite is especially perspective.

W pracy przedstawiono badania stanu naprężeń materiału przy niskich prędkościach uderzenia. Użycie ogólnych kryteriów destrukcji może dawać istotną informację do przybliżonego prognozowania rodzaju częściowego zniszczenia w materiale i rozmiarów strefy uszkodzenia. Badanie i wykorzystanie wiedzy o zjawisku podtrzymywania zniszczenia kruchych komponentów kompozytu są bardzo perspektywiczne w badaniach problemów przy uszkodzeniu uderzeniowym.