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Reference: Saka, Kolawole., (1987). Dynamic mechanical properties of fibre reinforced plastics. DPhil. University of Oxford.Citable link to this page:


Dynamic mechanical properties of fibre reinforced plastics

Abstract: A small gas gun, capable of accelerating a projectile 1m long by 25.4mmdiameter to about 50 m/s, and an extended split Hopklnson bar apparatus havebeen designed and constructed for the tensile impact testing of fibrereinforced composite specimens at strain rates of the order of 1000/s.Elastic strain measurements derived from the Hopkinson bar analysis arechecked, using strain gauges attached directly to the specimen and thevalidity of the elastic moduli determined under tensile impact is confirmed.Epoxy specimens reinforced with plain-weave fabrics of either carbon orglass or with several hybrid combinations of the two in various lay-ups,giving five different weight fractions of reinforcement from all-carbon toall-glass, have been tested in tension at three strain rates, nominally,~10-3/s, ~10/s and ~103/s. The effect of both hybrid composition (volumefraction of carbon reinforced plies) and applied strain rate on the tensilemodulus, the tensile strength and the strain to fracture is determined and alimited hybrid effect is observed in specimens with a carbon volume fractionin the approximate range 0.6 to 0.7 where, at all three strain rates thereis an enhancement of the failure strain over that for the all-carbon pliesand an increased failure strength, most marked in the impact tests, overthat predicted by the rule of mixtures. The fracture surfaces of specimensare examined by optical and scanning electron microscopy and the failureprocess in the hybrid composites is related to that found in the all-carbonand the all-glass specimens.The classical laminated plate theory and the Tsai-Wu strength criterionare used to predict the stiffness and strength of the hybrid composites fromthe elastic and strength properties of the constituent plies. Analyticalpredictions are in good agreement with experimental measurements.

Type of Award:DPhil Level of Award:Doctoral Awarding Institution: University of Oxford Notes:The digital copy of this thesis has been made available thanks to the generosity of Dr Leonard Polonsky


Harding, J. (John)More by this contributor



Dr. J. HardingMore by this contributor


 Bibliographic Details

Issue Date: 1987Identifiers

Urn: uuid:0514854d-36db-4cc1-b377-03a75550ab76

Source identifier: 602831293 Item Description

Type: Thesis;

Language: eng Subjects: Fiber-reinforced plastics Testing Strains and stresses Elasticity Tiny URL: td:602831293


Author: Saka, Kolawole. - institutionUniversity of Oxford facultyMathematical and Physical Sciences Division - - - - Contributors Harding

Source: https://ora.ox.ac.uk/objects/uuid:0514854d-36db-4cc1-b377-03a75550ab76


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