F. Mujika
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View article: Analytical determination and numerical validation of the shear factor in annular sector cross sections
Analytical determination and numerical validation of the shear factor in annular sector cross sections Open
In the present study, the shear factor of an annular sector cross section, including the thickness effect, has been analytically determined for the first time. The shear factors depend on the angle of the sector and on the mean radius to t…
View article: Energy release rate in bimaterial specimens tested in pure modes I and II
Energy release rate in bimaterial specimens tested in pure modes I and II Open
sponsorship: F.M. and A.A. gratefully acknowledge the financial support of the University of the Basque Country (UPV/EHU) in the Research Group GIU21/015 " Mechanics of Materials ". P.T. and L.F.M.d.S. gratefully acknowledge the financial …
View article: On the equivalent flexural and shear moduli of laminated beams: Definition and determination by bending tests
On the equivalent flexural and shear moduli of laminated beams: Definition and determination by bending tests Open
Equivalent flexural and shear moduli of laminated beams of rectangular cross-section made of orthotropic layers are defined by an analytical approach. Equivalent flexural and shear modulus are defined as those that would correspond to a ho…
View article: Mode decoupling in interlaminar fracture toughness tests on bimaterial specimens
Mode decoupling in interlaminar fracture toughness tests on bimaterial specimens Open
The present work has a two-fold objective: (i) to critically review the methods for fracture mode decoupling in unconventional laboratory specimens, such as the asymmetric double cantilever beam (ADCB) specimen; and (ii) to propose mode de…
View article: Analysis of displacement path dependence in mixed mode cohesive law
Analysis of displacement path dependence in mixed mode cohesive law Open
In the present work, a general theoretical analysis is presented and novel mathematical expressions are derived to obtain the cohesive law of adhesive joints under mixed-mode loading.
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\nIt is theoretically stated that the mixed-mode tru…
View article: Delamination Fracture Behavior of Unidirectional Carbon Reinforced Composites Applied to Wind Turbine Blades
Delamination Fracture Behavior of Unidirectional Carbon Reinforced Composites Applied to Wind Turbine Blades Open
One of the materials that is used widely for wind turbine blade manufacturing are fiber-reinforced composites. Although glass fiber reinforcement is the most used in wind turbine blades, the use of carbon fiber allows larger blades to be m…
View article: Numerical assessment of an experimental procedure applied to DCB tests
Numerical assessment of an experimental procedure applied to DCB tests Open
The different compressive and tensile moduli of fibre reinforced composites have been considered in the analysis of the flexural and shear moduli of I-beams. Firstly, the neutral axis has been determined analytically and then, assuming tha…
View article: A novel experimental procedure to determine the cohesive law in ENF tests
A novel experimental procedure to determine the cohesive law in ENF tests Open
This study presents a novel method to determine the mode II cohesive law of unidirectional carbon fiber reinforced polymer laminates, employing the End Notched Flexure (ENF) test. The fracture toughness in mode II (G) and crack shear displ…
View article: Analysis of DCB test of angle-ply laminates including bending-twisting coupling
Analysis of DCB test of angle-ply laminates including bending-twisting coupling Open
Se analiza la fractura interlaminar de laminados simétricos y antisimétricos angulares mediante el método Double Cantilever Beam. Como los semi-laminados son simétricos en ambos casos, se produce un acoplamiento de flexión-torsión. Sin emb…
View article: Comparison between the stiffness method and the hybrid method applied to a circular ring
Comparison between the stiffness method and the hybrid method applied to a circular ring Open
This study deals with the comparison of stresses and displacements of a circular ring obtained by two numerical formulations, namely the stiffness method and the hybrid method, applied to isoparametric quadrilateral elements. After explain…
View article: A novel procedure to determine the cohesive law in DCB tests
A novel procedure to determine the cohesive law in DCB tests Open
A novel method is presented for the determination of mode I cohesive law for the characterization of delamination in unidirectional carbon fiber reinforced polymer laminates. The energy release rate as a function of the crack advance is de…
View article: Analysis of the DCB test of angle-ply laminates including residual stresses
Analysis of the DCB test of angle-ply laminates including residual stresses Open
[ES] Se propone un nuevo método para obtener la tasa de liberación de energía mediante la prueba de doble viga en voladizo para laminados de capas angulares. Se estudian dos secuencias diferentes, simétrica y antisimétrica. El hecho de que…
View article: Experimental assessment of an End Notched Flexure test configuration with an inserted roller for analyzing mixed-mode I/II fracture toughness
Experimental assessment of an End Notched Flexure test configuration with an inserted roller for analyzing mixed-mode I/II fracture toughness Open
This study describes the experimental work related to a test configuration proposed recently, based on an End Notched Flexure test configuration modified with an inserted roller. Various mixed-mode ratio tests have been performed by the va…
View article: Analytical and numerical approach of an End Notched Flexure test configuration with an inserted roller for promoting mixed mode I/II
Analytical and numerical approach of an End Notched Flexure test configuration with an inserted roller for promoting mixed mode I/II Open
A test configuration for studying mixed-mode is analyzed analytically and numerically. It is based on the End Notched Flexure test, inserting a roller in the cracked part in order to promote mixed mode I/II. The analytical approach include…
View article: Application of the dual integrated force method to the analysis of the off-axis three-point flexure test of unidirectional composites
Application of the dual integrated force method to the analysis of the off-axis three-point flexure test of unidirectional composites Open
This paper shows the use of the dual integrated force method in the finite element method and its application to unidirectional composite laminates. This method was developed by SN Patnaik for isotropic materials, considering not only the …
View article: Analysis of a reversible five-point bending configuration based on a novel two-sense support
Analysis of a reversible five-point bending configuration based on a novel two-sense support Open
A novel two-sense support for flexural tests has been designed and manufactured in Ikerlan. The aim of this support is to do two-sense bending fatigue tests. In order to reduce the displacement corresponding to a given stress, a novel test…
View article: A new approach for determining the R-curve in DCB tests without optical measurements
A new approach for determining the R-curve in DCB tests without optical measurements Open
A new method for obtaining the R-curve point to point by the Double Cantilever Beam test is proposed. Besides the determination of new compliance and energy release rate equations, the analytical model presented leads to calculate the crac…