Search results for "Hole drilling method"

showing 3 items of 13 documents

Dependence between aging treatments and residual stresses on composite laminate

2006

International audience; The objective of this paper is to study the influence of residual stresses due to fabrication conditions on the thermomechanical behavior of carbon/epoxy laminate structures (cross ply). These studied laminates have undergone various cycles of thermal aging. The addition of a post-cure cycle after the end of the initial cycle makes it possible to reduce the residual stresses level. The incremental hole-drilling method is used to measure the residual strain in the laminates. These measured strains and the numerical calibration coefficients obtained by the finite element method allow to calculating the residual stress distribution in composite depth. The obtained resul…

Residual StressAgingMaterials scienceFabrication[SPI] Engineering Sciences [physics]Composite numberComposite02 engineering and technology[SPI]Engineering Sciences [physics]0203 mechanical engineeringResidual stress[SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph]CalibrationGeneral Materials ScienceComposite materialComputingMilieux_MISCELLANEOUSHole drilling methodMechanical EngineeringEpoxyHole-Drilling Method021001 nanoscience & nanotechnologyCondensed Matter PhysicsFinite element method020303 mechanical engineering & transportsCuring CycleMechanics of Materialsvisual_artvisual_art.visual_art_medium0210 nano-technologyReduction (mathematics)
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ERROR AND UNCERTAINTY ANALYSIS OF THE RESIDUAL STRESSES COMPUTED BY USING THE HOLE DRILLING METHOD

2011

The hole-drilling method is one of the most used techniques for the experimental analysis of the residual stresses in mechanical components. For both through-thickness uniform and non-uniform residual stresses, its practical application is standardised by the ASTM E837-08. For uniform residual stresses, to which the present work deals with, the use of the method in accordance with the ASTM limitations, leads to results with a bias of about 10%. Unfortunately, although some experimental parameters can be frequently out of the corresponding standard limitation, the user does not have appropriate procedures to correct the obtained results which, in accordance with the ASTM standard, have to be…

Settore ING-IND/14 - Progettazione Meccanica E Costruzione Di Macchineresidual stresses hole drilling method uncertainty analysis
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Advances in Strain Gauge Measurement on Composite Materials

2010

Abstract:  This article gives an overview on the application of strain gauge techniques to the analysis of the strains in composite materials. The orthotropic behaviour of the composite influences the performance of strain gauges that are calibrated for use on isotropic materials. The article considers therefore the typical topics of the strain gauge technology applied to composites with particular reference to the compensation of thermal output, the measurement of the coefficients of thermal expansion, the determination of the strain and stress state, the influence of the misalignment error, the reinforcement effect, the determination of the stress intensification factor, the analysis of r…

Stress (mechanics)Hole drilling methodMaterials scienceMechanics of MaterialsResidual stressMechanical EngineeringIsotropyComposite numberComposite materialOrthotropic materialStrain gaugeThermal expansionStrain
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