Influence of textile properties on dynamic mechanical behavior of epoxy composite reinforced with woven sisal fabrics
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Ó Indian Academy of Sciences Sadhana(0123456789().,-volV)FT 3](0123456789().,-volV)
Influence of textile properties on dynamic mechanical behavior of epoxy composite reinforced with woven sisal fabrics M NAGAMADHU1,* , P JEYARAJ2
and G C MOHAN KUMAR2
1
Department of Mechanical Engineering, Acharya Institute of Technology, Bengaluru 560107, India Department of Mechanical Engineering, National Institute of Technology Karnataka, Srinivasanagar, Surathkal 575025, India e-mail: [email protected]; [email protected]; [email protected]
2
MS received 18 May 2019; revised 19 August 2019; accepted 24 September 2019 Abstract. Due to low cost and environmentally friendly characteristics, natural fibers gain much attention over synthetic fiber. The aim of the present work is to characterize the textile properties of three different types of sisal fabric and study dynamic mechanical properties and water absorption behavior of the sisal fabric reinforced epoxy composite. Influence of grams per square meter of fabric, weaving pattern of the fabric on textile properties of the fabric is studied first. Further, the effect of the same on the dynamic mechanical properties of the sisal composites is studied. Effect of fiber weight percentage and dynamic frequency on dynamic mechanical properties also studied. Results reveal that the storage modulus (G0 ) decreases with increasing temperature in all the woven types of composites under consideration. However, Plain 2 (P2) and Weft Rib (WR) composites have shown better values of G0 even after the glass transition temperature (Tg). From the results, it is also evident that storage and loss modulus (G00 ) increases when the yarn diameter decreases which is observed at a higher temperature also. It is also observed that fabric density also plays a significant role in the enhancement of G0 and G00 values. The water absorption of Plain 1 (P1) based composites are found to be less compared to the other types of composites analyzed. Keywords.
Epoxy; woven sisal fabric; warp; weft; dynamic mechanical analysis.
1. Introduction Over a period of time, the majority of the moderate loadcarrying structural member applications in automobiles and other industries are replaced with natural fiber-reinforced composites as they are environmentally friendly [1–3]. In lieu of this, a lot of research work has been accomplished, and these substantial developments have also been made to realize the morphological structures and subsequent properties of these composites [4–6]. However, woven fabric based natural fiber composites have better mechanical properties compared to randomly oriented and nonwoven composites [7]. In this regard, researchers demonstrated that the direction of filler yarn [8], stitched and z-pinned [9], stacking sequence [10] braided composite exhibits better tensile [11], flexural and impact [12] properties. This clearly indicates that the mechanical strength of these woven composites is influenced by natural woven fabric. So, it is important to understand the influence of fabric/
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