Vinyl Ester+Jute97new

Download Vinyl Ester+Jute97new

Post on 29-Dec-2014




2 download

Embed Size (px)


<p>OPTIMUM COMPOSITION OF JUTE FABRIC AND VINYL ESTER FOR THE MAXIMUM STRENGTH</p> <p>INTRODUCTIONCOMPOSITE MATERIALS DEFINITIONS :TWO OR MORE MATERIALS BONDED TOGETHER A MATERIAL CONSISTING OF ANY COMBINATION OF FIBRES, WHISKERS AND PARTICLES IN A COMMON MATRIX</p> <p>WHY COMPOSITES???HIGH SPECIFIC STRENGTH (STRENGTH /DENSITY) HIGH SPECIFIC MODULUS (MODULUS/DENSITY) FATIGUE RESISTANCE CREEP AND CREEP RUPTURE RESISTANCE LOW TAILORABLE COEFFICIENT OF THERMAL EXPANSION WEAR RESISTANCE CORROSION RESISTANCE TAILORABLE ELECTRICAL CONDUCTIVITY (Very low to very high)</p> <p>WHY COMPOSITES??? Continued..TAILORABLE THERMAL CONDUCTIVITY(Very low to extremely high) GREAT DESIGN FLEXIBILITY LOW COST FORMABLE TO COMPLEX SHAPE</p> <p>COMPOSITIONS USED.VINYL ESTER JUTE FABRICS METHYL ETHYL KETONE PEROXIDECATALYST COBALT NAPHTHENATE- PROMOTER DIMETHYL ANILINE- ACCELERATOR</p> <p>VINYL ESTERVinyl Ester is a resin produced by the esterification of an epoxy resin with an unsaturated monocarboxylic acid. They are used because of their high corrosive resistance, high impact strength, high thermal resistance and low viscosity.</p> <p>JUTE FABRICS It primarily consists of cellulose, hemi cellulose and lignin.</p> <p>PREPARATIONTREATMENT OF FABRICSALKALI TREATMENT PRE-CURING NEUTRALIZATION WITH ACID COMPLETE NEUTRALIZATION WITH DISTILLED WATER DRYING</p> <p> PREPARATION OF RESIN</p> <p> QUANTIZATION OF VINYL ESTER, ACCELERATOR, PROMOTER AND CATALYST MIXING THE COMPONENTS</p> <p>CALCULATIONFOR THE COMPOSITION 32:68 [JUTE:RESIN] Density of the laminate= Wt fraction of jute fabrics * (density of jute fabrics+ Wt fraction of resin) * density of resin = 0.32 * (1.5+0.68) * 1.05 =1.194 g/cc Mass of the laminate = Density of the laminate * Volume of the laminate = 1.194 * 25 * 25 * 0.5 = 373.125 g Ratio of vinyl ester: accelerator: promoter: catalyst =100:2:2:2 Mass of the resin = mass of the laminate * Wt fraction of resin = 373.125 * 0.68 =253.725 g Mass of vinyl ester =100/106 * Mass of resin =100/106 * 253.725 =239.36 g</p> <p>CALCULATION CONTINUEDMass of accelerator = 2/106*mass of the resin = 2/106*253.725 = 4.78 g Mass of promoter = 2/106*mass of the resin = 2/106*253.725 = 4.78 g Mass of catalyst = 2/106*mass of the resin = 2/106*253.725 = 4.78 g Mass of jute fabrics = mass of the laminate*wt fraction of jute fabrics = 373.125*0.32 = 119.4 g No of plies = Mass of jute fabrics/mass of 1 ply = 119.4/24 = 4.9755 plies</p> <p> PREPARATION OF LAMINATE APPLYING RESIN ON THE FABRIC CURING POST CURING</p> <p>TESTING</p> <p>SPECIMEN USED- 32:68 [FABRICS:RESIN]</p> <p>1. TENSILE TESTMACHINE USED: UTM TESTING SPEED: 10mm/min GAUGE LENGTH: 80mm LENGTH : 150mm WIDTH : 12mm THICKNESS: 7.5mm</p> <p>Tensile strength = max load/c.s. area N/mm = 2002.5/12*7.5 =22.25 N/mm</p> <p>Tensile modulus = dy/dx N/m = slope from the graph = (2002.5-2.5)/(1.3080.0015) = 1530.807N/m</p> <p>2.FLEXURAL TEST MACHINE USED: UTM SPEED OF THE TEST: HALF THE THICKNESS OF THE SPECIMEN SPAN LENGTH: 100mm LENGTH: 150mm WIDTH: 12.7mm THICKNESS: 7.8mm</p> <p>FLEXURAL STRENGTH=3Pl/2bd . N/mm Where, P=Breaking load, N l=Span length, mm d=Depth, mm b=Width, mm Therefore, Flexural strength=3*122*100/2*12.7*7.8 =47.368 N/mm Flexural Modulus=l y/4bd N/mm Where, y=slope of the tangent of the initial straight line portion of the load deformation curve. = dy/dx. =(121-8)/(3.15-.5) = 42.64 N/mm Flexural</p> <p>COMPARISION OF FLEXURAL STRENGTH</p> <p>3.IMPACT TEST-CHARPY. MACHINE USED: PENDULUM IMPACT TESTER LENGTH: 127 mm BREADTH: 12.7mm THICKNESS: 4.4mm</p> <p>IMPACT STRENGTH= IE/bh N-m/cm Where, IE= IMPACT ENERGY REQUIRED TO BREAK THE SPECIMEN, N-m Therefore, IMPACT STRENGTH= 0.42/(1.27*0.44) =0.75 N-m/cmImpact energy(N-m)composition</p> <p>1</p> <p>2</p> <p>3</p> <p>4</p> <p>average</p> <p>Impact strength(Nm/cm)</p> <p>32:68 34:66 36:64 38:62</p> <p>0.42 0.46 0.40 0.38</p> <p>0.41 0.44 0.42 0.38</p> <p>0.43 0.46 0.39 0.39</p> <p>0.42 0.45 0.40 0.38</p> <p>0.42 0.453 0.403 0.382</p> <p>0.75 0.758 0.646 0.568</p> <p>COMPARISION OF IMPACT STRENGTH FOR VARIOUS COMPPOSITION</p> <p>4.SURFACE HARDNESS MACHINE USED : SHORE-D HARDNESS TESTING MACHINE</p> <p>Compo sition</p> <p>SPECIMEN HARDNESS(SHORE-D) 1 2 3 4 5 46 50 43 23 47 49 40 22 50 53 36 23 52 48 45 25 49 54 43 19</p> <p>Averag e</p> <p>32:68 34:66 36:64 38:68</p> <p>48.8 50.8 41.4 22.4</p> <p>COMPARISION OF HARDNESS FOR VARIOUS COMPOSITION</p> <p>RESULTSThe mechanical properties are optimal for the ratio 34:66 [jute: resin]</p>


View more >