[en] Understanding the out-of-plane mechanical behavior of composite materials is necessary to optimally design thick structures. In unidirectional laminates, the out-of-plane mechanical behavior is generally characterized by the in-plane data assuming transverse isotropy; nevertheless unidirectional woven contain a fraction of fill yarns that might change this property. To evaluate the fill yarns effect over the transverse isotropy, this work compares the in-plane mechanical performance to the out-of-plane behavior under a cyclic load for an epoxy glass fiber reinforced by a unidirectional weave.First, the quasi-static tensile and compression strengths were determined for both planes. Fatigue tests were then performed at 95%, 90%, 80% and 70% of the compressive strength using stress ratios of R= 2, R= 10 (in compression-compression fatigue) and the critical stress ratio defined by the quotient between the compressive and tensile strengths. The results show that the quasi-static tensile strength depends on the plane, mainly due to the influence of the weave fill fibers. These fibers also influence the observed differences in compressive strength; however, the specimen geometry and boundary conditions also have an effect. Despite these differences, the fatigue strength detriment responds to the same causes and their magnitude in terms of the number of cycles is similar. An in-plane S-N curve of the compression-compression fatigue can be transformed into an out-of-plane curve using the compressive strength in both planes and vice versa.
Disciplines :
Mechanical engineering
Author, co-author :
San Juan, Víctor; Department of Mechanical Engineering (DIM), Faculty of Engineering (FI), University of Concepción, Chile
Fernandez Sanchez, Eduardo Felipe ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > LTAS-Mécanique numérique non linéaire ; University of Concepcion > Mechanical Engineering
Pincheira, Gonzalo; Advanced Nanocomposites Research Group (GINA), Department of Materials Engineering (DIMAT), Faculty of Engineering (FI), University of Concepción, Chile
Meléndrez, Manuel; Advanced Nanocomposites Research Group (GINA), Department of Materials Engineering (DIMAT), Faculty of Engineering (FI), University of Concepción, Chile
Flores, Paulo; Department of Mechanical Engineering (DIM), Faculty of Engineering (FI), University of Concepción, Chile
Language :
English
Title :
Evaluation of the fill yarns effect on the out-of-plane compressive fatigue behavior for an unidirectional glass fiber reinforced epoxy composite
This study was supported financially by FONDEF CA12I10308 and Fondef IT 13i10054 from the Government of Chile. The authors would also like to thank the National Commission for Scientific and Technological Research, CONICYT (Ministry of Education-Government of Chile) for the Ph.D. scholarship grants of G. Pincheira and the CIPA, CONICYT Regional, GORE BIO R08C1002.
Park D.C., Lee S.M., Kim B.C., Kim H.S., Lee D.G. Development of heavy duty hybrid carbon-phenolic hemispherical bearings. Compos Struct 2006, 73:88-98.
Kim B.C., Park D.C., Kim H.S., Lee D.G. Development of composite spherical bearing. Compos Struct 2006, 75:231-240.
Li Q., Piechna J., Müeller N. Simulation of fatigue failure in composite axial compressor blades. Mater Des 2011, 32:2058-2065.
Bakaiyan H., Hosseini H., Ameri E. Analysis of multi-layered filament-wound composite pipes under combined internal pressure and thermomechanical loading with thermal variations. Compos Struct 2009, 88:532-541.
Totry E., González C., LLorca J. Prediction of the failure locus of C/PEEK composites under transverse compression and longitudinal shear through computational micromechanics. Compos Sci Technol 2008, 68:3128-3136.
Park D.C., Lee D.G. Through-thickness compressive strength of carbon-phenolic woven composites. Compos Struct 2005, 70:403-412.
Kim B.C., Park D.C., Kim B.J., Lee D.G. Through-thickness compressive strength of a carbon/epoxy composite laminate. Compos Struct 2010, 92:480-487.
Abot J.L., Daniel I.M. Through-thickness mechanical characterization of woven fabric composites. J Compos Mater 2004, 38:543-553.
Gan K.W., Hallett S.R., Wisnom M.R. Measurement and modelling of interlaminar shear strength enhancement under moderate through-thickness compression. Compos Part A Appl Sci Manuf 2013, 49:18-25.
DeTeresa S.J., Freeman D.C., Groves S.E. The effects of through-thickness compression on the interlaminar shear response of laminated fiber composites. J Compos Mater 2004, 38:681-697.
Gan K.W., Wisnom M.R., Hallett S.R. Effect of high through-thickness compressive stress on fibre direction tensile strength of carbon/epoxy composite laminates. Compos Sci Technol 2014, 90:1-8.
Pettersson K.B., Neumeister J.M., Kristofer Gamstedt E., Öberg H. Stiffness reduction, creep, and irreversible strains in fiber composites tested in repeated interlaminar shear. Compos Struct 2006, 76:151-161.
Daniel I.M., Luo J.J., Schubel P.M. Three-dimensional characterization of textile composites. Compos Part B Eng 2008, 39:13-19.
Daniel I.M., Luo J.J., Schubel P.M., Werner B.T. Interfiber/interlaminar failure of composites under multi-axial states of stress. Compos Sci Technol 2009, 69:764-771.
Puck A., Schu H. Failure analysis of FRP laminates by means of physically based phenomenological models.pdf. Compos Sci Technol 2002, 62:1633-1662.
Adumitroaie A., Barbero E.J. Beyond plain weave fabrics - I. Geometrical model. Compos Struct 2011, 93:1424-1432.
Hara E., Yokozeki T., Hatta H., Ishikawa T., Iwahori Y. Effects of geometry and specimen size on out-of-plane tensile strength of aligned CFRP determined by direct tensile method. Compos Part A Appl Sci Manuf 2010, 41:1425-1433.