FARKLI TAKVİYE MALZEMELERİNİN KOMPOZİT MALZEME MEKANİK ÖZELLİKLERİNİN İYİLEŞTİRİLMESİNE ETKİSİ

Modern imalatlarda yüksek mekanik ve teknolojik özelliklere ihtiyaç olduğunda geleneksel malzemeler bunlara cevap veremez. Yüksek mukavemet ve hafiflik talepleri birbiri ile çelişen iki mühendislik isteği olup ancak kompozit malzemeler bunları sağlarlar. Bu nedenle kompozit malzemelerin endüstride kullanımları giderek zorunlu hale gelmiştir. Sheet Molding Compounds (SMC) yüksek mukavemetli parçaların seri olarak üretildiği başta otomotiv olmak üzere birçok alanda kullanılan termoset bir polimer kompozit yöntemidir. Bu çalışmada, mukavemeti artırmak için rasgele fiberler yerine dokuma cam fiberler kullanılarak elde edilen mekanik değerler irdelenmiştir. Sonuçlar incelendiğinde; rasgele cam fiber malzeme ile çekme gerilmesi değeri ortalama 67,58 MPa değerine ulaşırken, aynı şartlar ve ağırlık oranında dokuma cam elyaf takviye malzemesi kullanıldığında bu değer ortalama 137,29 MPa değeri sağlanmıştır. Mukavemet değerlerinde sağlanan artış yaklaşık iki kattır.

Anahtar Kelimeler:

Kompozit, SMC; Takviye Malzemesi; Dokuma

Effects of Different Reinforcements for Improving Mechanical Properties of Composite Materials

The traditional materials are inadequate to the needs of modern manufacturing such as high mechanical and technological properties. There is a conflict with the demands of high-strength and lightweight, however the composite materials with diverse reinforcements provide each of the requests. Therefore, the use of the composite materials in industrial applications has become increasingly necessary. Sheet Molding Compounds (SMC) is a production method which the thermoset polymer composite parts with high-strengths can be manufacture in series for many areas, including automotive.In this study, the mechanical properties of two different SMC materials were examined which obtained using woven glass fibers and nonwoven (random) fibers as reinforcements to increase strengths of the resulting material. The experimental results showed that the tensile strength of the SMC specimen with random fibers reached an average value of 67.58 MPa, but the average value of the specimen with woven glass fiber reinforcement in the same conditions and a weight ratio was reached up to 137.29 MPa. With this new material, the tensile strength values were increased approximately to double.

Keywords:

SMC, Composites; Woven Fiber; Mechanical Properties,

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Abrams, L. M. ve Castro, J. M. (2003) Predicting Molding Forces During Sheet Molding Compound (SMC) Compression Molding. I: Model Development, Polymer Composıtes, June Vol. 24, No. 3.
Akermo, M. ve Astrom, B.T. (2000) Modelling component cost in compression moulding of thermoplastic composite and sandwich components, Composites, Part A 31 319–333.
Caprino, G. ve Santo, L. (1998) Interpretation of size effect in orthogonal machining of composite materials. Part II. Sheet moulding compound, Composites, Part A 29A 893–897.
Corre, S. L., Orge´as, L., Favier, D., Tourabi, A., Maazouz, A. ve Venet, C. (2002) Shear and compression behaviour of sheet moulding compounds, Composites Science and Technology, 62 571–577.
Feuillade, V., Bergeret, A., Quantin, A. ve Crespy, J.-C. (2006) Relationships between the glass fibre sizing composition and the surface quality of sheet moulding compounds (SMC) body panels, Composites Science and Technology, 66 115–127.
Fitoussi J., Bocquet M. ve Meraghni F. (2013) Effect of the matrix behavior on the damage of ethylene–propylene glass fiber reinforced composite subjected to high strain rate tension Composites: Part B, 45 1181–1191.
Fitoussi, J., Meraghni, F., Jendli, Z., Hug, G. ve Baptiste D. (2005) Experimental methodology for high strain-rates tensile behaviour analysis of polymer matrix composites, Composites Science and Technology, 65 2174–2188.
Guiraud , O., Dumont, P.J.J. ve Orge´as, L. (2013) How to Prepare SMC and BMC-like Compounds to Perform Relevant Rheological Experiments?, Appl Compos Mater, 20:157–169.
Huang, B. Z. ve Zhao L.J. (2012) Bridging and toughening of short fibers in SMC and parametric optimum, Composites: Part B, 43 3146–3152.
Jendli, Z., Meraghni, F., Fitoussi, J. ve Baptiste, D. (2004) Micromechanical analysis of strain rate effect on damage evolution in sheet molding compound composites Composites, Part A 35 779–785.
Kim, J.W., Kim, H.S., Lee D.G. (2014) Measurement of tensile strength and infrared thermography on unidirectional GFRP, Materials Research Bulletin., vol. 58 35-38.
Kim, M-S., Lee, W-I., Han, W-S. ve Vautrin, A. (2011) Optimisation of location and dimension of SMC precharge in compression moulding process, Computers and Structures, 89 1523–1534.
Kim, S-Y. ve Im, Y-T. (1997) Three-dimensional Finite-element Analysis of Compression Molding of Sheet Molding Compound, Journal of Materials Processing Technology, 67 207-213.
Kim, S-Y. ve Im, Y-T. (1997) Three-dimensional thermo-viscoplastic analysis of compression molding of sheet molding compounds with fiber volume fraction prediction, Journal of Materials Processing Technology, 63 631-636.
Le, T.-H., Dumont, P.J.J., Orge´as, L., Favier, D., Salvo, L. ve Boller, E. (2008) X-ray phase contrast microtomography for the analysis of the fibrous microstructure of SMC composites, Composites, Part A 39 91–103.
Marissen, R. ve Linsen, J. (1999) Variability of the flexural strength of sheet moulding compounds, Composites Science and Technology, 59 2093-2100.
Merle, G., Allemand, J., Camino, G., Luda , M. P., Revellino, M. ve Blancon, R. (1998) Morphology analysis of microvoids in SMC: ageing effects, Composites, Part A 29A 1535–1543.
Ochola, R.O., Marcus, K., Nurick, G.N. ve Franz, T. (2004) Mechanical behaviour of glass and carbon fibre reinforced composites at varying strain rates, Composite Structures, 63 455–467.
Ogi, K. ve Yamanouchi M. (2011) Temperature Dependence of Flexural Strength of a CF-SMC, Composite Appl Compos Mater, 18:397–408.
Palmer, J., Savage, L., Ghita, O.R. ve Evans, K.E. (2010) Sheet moulding compound (SMC) from carbon fibre recyclate, Composites, Part A 41 1232–1237.
Pickering , S.J. (2006) Recycling technologies for thermoset composite materials-current status, Composites, Part A 37 1206–1215.
Rosato D. ve Rosato D. (2004) Reinforced Plastics Handbook, Elsevier Science & Technology Books.
Taketa, I., Okabe, T., Matsutani H. ve Kitano, A. (2011) Flowability of unidirectionally arrayed chopped strands in compression molding, Composites, Part B 42 1764–1769.
Tatara, R.A. (2011) Chapter 17: Compression Molding, Edited:Kutz M. Applied Plastics Engineering Handbook, Processing and Materials, USA.
Voorn, B. V., Smit, H.H.G., Sinke, R.J. ve Klerk B. D. (2001) Natural Fibre Reinforced Sheet Molding Compound, Composites, Part A 32 1271-1279.