عنوان البحث(Papers / Research Title)
Investigation of Biaxial Creep of Hybrid Woven Fabric of (LDPE/Nylon, Polyester) Composite Materials
الناشر \ المحرر \ الكاتب (Author / Editor / Publisher)
نجم عبد الامير سعيد اللوباوي
Citation Information
نجم,عبد,الامير,سعيد,اللوباوي ,Investigation of Biaxial Creep of Hybrid Woven Fabric of (LDPE/Nylon, Polyester) Composite Materials , Time 5/11/2011 5:45:03 AM : كلية هندسة المواد
وصف الابستركت (Abstract)
Composite Materials
الوصف الكامل (Full Abstract)
Abstract Hybrid woven fabric composite materials suffer of anisotropic in behavior. It leads to difficult in the designing and fabricating of composite material. The present work aim to study the biaxial creep phenomena of the hybrid woven fabric composite .It consist of low density polyethylene matrix and plain weave from nylon and polyester. The study is carried out by numerical analysis and experimental .The numerical analysis (FEM) includes biaxial creep model is implemented by ANSYS (10) code. To verify the ability of this model in the prediction the effect of anisotropic on biaxial creep, the experimental work is conducted. The experimental work includes designing and fabrication of biaxial creep test Rig. The experimental result show the creep values in the direction of polyester fiber are lower than that in the direction of nylon fiber, and also show the experimental creep values is higher than numerical values.
Keywords: Composite materials, hybrid fibers, biaxial creep behavior, in-plane biaxial testing, cruciform specimens, finite element method. 1. Introduction The rapidly expanding applications of textile fabric composites in the recent past years have provided much optimism for the future of engineering design and technology [1],with the recent advances in modern industrial materials, such as high polymers and polymeric base composite materials , and their extensive application in aerospace and other industries [2].Textile composite were considered for many components to improve structural performance and to reduce costs [3,4]. Polymer composites are viscoelastic in nature (i.e. their behavior is a combination of viscous and elastic behavior).
While being used for load bearing structural application, polymer composites exhibit time dependent degradation in modulus and strength, as a consequence of viscoelasticity of the polymer matrix. The time dependent modulus and strength of composite materials are measured by creep and creep rupture tests, respectively .Since characterizing the time dependent modulus and strength for the entire service life is impossible, accelerated testing and extrapolation procedures are used to extrapolate creep data obtained over a short time to time frame beyond the experimental time window. Hybrid woven fabric composite materials suffer of anisotropic in behavior. It leads to difficult in the designing and fabricating of composite material. There are a numerous of the researchers deals with this subject. Such as, D.E.Duvall & D.B.& Edwards (1993),in their work presented a method for evaluating the creep and stress rupture response of polyethylene sheet under equal bi-axial loading . Specimens have been tested at 23, 60, 80 °C, [5,] .V.Shekar (2000) investigated tensile creep behavior of woven fabric composite stitched through the thickness with carbon threads along the loading direction.
Creep tests were conducted at various temperatures. It was found that through - thickness stitching significantly improved resistance for creep deformation and creep rupture of stitched composites [6]. P. Boisse & et.al. (2001) studied of the mechanical behavior under bi-axial tension. The study results are obtained for a set of fiber fabric reinforcements that show the consequences of undulations and interactions at the macroscopic scale[ 7].K.J. Philps (2002)studied stress relaxation of tufted carpets components .This research seeks to analyze the various components and which plays in the phenomena of stress relaxation .Since a carpet is always stretched in both dimensions simultaneously during installation ,the results of this work show that fabrics may have higher creep and stress relaxation values due to the greater opportunities for movement in the fabric structure since the yarns and the fibers within the yarns may be able to shift positions in order to alleviate stress[8]. The present work aim to study the biaxial creep phenomena of the hybrid woven fabric composite .It consist of low density polyethylene matrix and plain weave from nylon and polyester.
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