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The Hong Kong Polytechnic University Department of Mechanical Engineering

CONSULTANCY SERVICE FOR RYOWO (HOLDING) COMPANY, LIMITED

Uniaxial Tensile Test on SMC Panels

by Dr. P.C. Tse (Associate Professor, BSc, MSc, PhD, MHKIE, CEng) Department of Mechanical Engineering The Hong Kong Polytechnic University

Date: 19 April 2006

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The Hong Kong Polytechnic University Department of Mechanical Engineering

Contents

(A) Summary (B) Uniaxial Tensile Test and Fibre Mass Fraction Measurement (C) Conclusions

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The Hong Kong Polytechnic University Department of Mechanical Engineering

(A) Summary Uniaxial tensile test of SMC Panels were carried out in accordance to BS 2782-3: Methods 320A to 320F:1976 "Methods of Testing Plastics – Part 3: Mechanical properties – Methods 320A to 320F: Tensile strength, elongation and elastic modulus" and Singapore Standard 245:1995 (ICS 23.020.10) "Specification for Glass Reinforced Polyester Sectional Water Tanks″. A typical specimen prepared for uniaxial tensile test is shown on the figure in Appendix 1 and a specimen under test is shown on the figure in Appendix 2. Five specimens from each SMC panel were tested to obtain the Young’s modulus, Poisson’s ratio, elongation and failure stress. The fibre mass fraction of the panels was obtained in accordance to BS2782 : Part 10 : Method 1002 : 1977 EN60 "Determination of Loss on Ignition" and BS 5734-1:1990 "Polyester Moulding Compounds for Electrical and Other Purposes" at some selected locations. A typical specimen for fibre fraction measurements and the fibre obtained after burn-off process are shown on the figures in Appendix 4.

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The Hong Kong Polytechnic University Department of Mechanical Engineering

(B) Unixial Tensile Test and Fibre Mass Fraction Measurement • All the specimens for uniaxial tensile test were supplied by the client. • Specimens were prepared and tested in accordance to BS 2782-3: Methods 320A to 320F:1976 "Methods of Testing Plastics – Part 3: Mechanical properties – Methods 320A to 320F: Tensile strength, elongation and elastic modulus" and Singapore Standard 245:1995 (ICS 23.020.10) "Specification for Glass Reinforced Polyester Sectional Water Tanks″. • The location where the test specimens were cut from each panel is shown on the figures in Appendix 3.

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The Hong Kong Polytechnic University Department of Mechanical Engineering

(C) Conclusions The Young’s modulus, Poisson’s ratio, elogation and failure stress for each specimen are shown in the following tables:

Panel Code: 11-SG Young's Modulus (GPa) 12.50 SG1 12.34 SG2 12.64 SG3 12.51 SG4 12.50 SG5 AVERAGE 12.50 Specimen Poisson's Ratio 0.241 0.237 0.241 0.248 0.266 0.247 Elongation (%) 3.28 3.47 3.35 3.29 3.15 3.31 Failure Stress (MPa) 61.93 61.26 63.00 64.07 60.28 62.11

Panel Code: 11-SE Young's Modulus (GPa) 12.69 SE1 12.87 SE2 12.88 SE3 12.87 SE4 13.05 SE5 AVERAGE 12.87 Specimen Poisson's Ratio 0.271 0.275 0.273 0.267 0.280 0.273 Elongation (%) 4.27 3.87 4.46 4.14 4.23 4.20 Failure Stress (MPa) 78.74 74.61 80.56 77.99 76.56 77.69

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The Hong Kong Polytechnic University Department of Mechanical Engineering

Panel Code: 11-SC Young's Modulus (GPa) Specimen 11.17 SC1 11.61 SC2 11.53 SC3 11.17 SC4 11.57 SC5 AVERAGE 11.41 Poisson's Ratio 0.254 0.267 0.244 0.263 0.231 0.251 Elongation (%) 3.38 3.20 3.36 3.08 3.20 3.24 Failure Stress (MPa) 64.89 65.18 68.70 67.26 67.90 66.79

Panel Code: 11-BG Young's Modulus Specimen (GPa) 11.65 BG1 11.46 BG2 11.06 BG3 11.36 BG4 11.27 BG5 AVERAGE 11.36 Poisson's Ratio 0.257 0.248 0.251 0.272 0.268 0.259 Elongation (%) 3.85 3.69 3.03 3.65 3.80 3.60 Failure Stress (MPa) 70.59 64.69 63.28 65.90 70.48 66.99

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The Hong Kong Polytechnic University Department of Mechanical Engineering

Panel Code: 11-BE Young's Modulus (GPa) Specimen 12.09 BE1 12.08 BE2 12.68 BE3 12.34 BE4 12.20 BE5 AVERAGE 12.28 Poisson's Ratio 0.276 0.258 0.256 0.272 0.246 0.262 Elongation (%) 4.42 3.93 4.35...
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