Different filler materials are widely used in industry both for obtaining better mechanical properties and decreasing the overall costs. In this study, several uniaxial tensile tests were conducted for 5.15% (MP 1 -GS 1 ), 9.4% (MP 2 -GS 2 ), and 13.4% (MP 3 -GS 3 ) of glass spheres and mica powder-filled elastomer materials. In this research, the results obtained from tensile tests of samples made of natural rubber/styrene-butadiene rubber (NR/SBR)-based elastomer materials in which different amount of glass spheres (GS) and mica powder (MP) mixed were characterized using the finite element method. The values of forces and displacements obtained from the tests were transferred to ABAQUS 6.7 finite element analysis (FEA) software. Among all hyperelastic material models, Marlow's model was found to be the most suitable one and was utilized as a material model in the FEA. Mechanical tests and the finite element results were compared with each other. Comparison of the results show that while the error percentage changed between 0.01 and 0.5% for the MP-filled samples, the error percentage changed between 0.25 and 0.5% for GS-filled samples. The effects of MP and GS filler materials on the mechanical properties of NR/SBR elastomer were compared. Maximum stress and strain values were observed in GS 2 and MP 2 materials.
ÖzBu çalışmada otomotiv süspansiyon sistemi elemanı olan sac salıncak kollarınım üretiminde kullanılan DD13 ve S355MC kalite sacların, üretimde karşılaşılan yırtılma probleminin çözüm süreçleri araştırılmış ve problemin çözümü gerçekleştirilmiştir. Çalışmada Autoform yazılım programı yardımıyla gerçekleştirilen analiz çalışmalarında yırtılmaya maruz kalacak kritik bölgeler tespit edilerek, geometride bazı iyileştirmeler yapılmıştır. Çalışmanın sonraki aşamasında her iki malzeme için de yırtılmanın gözlendiği bölgede oluşan çentik etkisinin giderilmesi için parlatma işlemi yapılmıştır. Parlatma sonrasında DD13 için yırtılma probleminin boyun verme eğiliminde olduğu, S355MC malzemesinde ise yırtılma probleminin azaldığı gözlenmiştir. Bir sonraki aşamada, her iki malzemeye sürtünmeyi azaltmak için kalıp yağlayıcı teflon film kullanılmıştır. DD13 malzemesi için yırtılma problemi tamamen giderilirken, S355MC malzemesinde boyun verme ve yırtılma problemleri azda olsa devam etmektedir. Son aşamada yırtılma problemi giderilemeyen S355MC malzemesinin kritik bölgesine ısıl işlem uygulanmış ve yırtılma problemi giderilmiştir. Çalışmalara ek olarak elde edilen hatasız sac salıncak parçalara ±380 kgf yük altında 500.000 çevrim ile uygulanan yorulma testleri sonrasında parçalarda herhangi bir hasar gözlenmemiştir.
In this work, dielectric and tunability properties of glass spheres containing elastomer based materials have been investigated with dielectric spectroscopy as a function of frequency, composition and DC bias field. Real and imaginary part of dielectric constant and dielectric loss values of the gs1 (glass spheres), gs2, and gs3 were investigated in the frequency range of 100 to 40 × 10 6 Hz. Dielectric tunabilities of 69%, 87% and 33% were measured on gs1, gs2, and gs3 at 10 kHz and at room temperature. The degrees of anharmonic contributions to the polar ization are very high for gs2 and gs3 as 4.53 × 10 −8 and 1.77 × 10 −8 (mm/kV) 2 . Also, dielectric constant, FOM (%) and absorption coefficient a values were calculated at 10 × 10 3 Hz and 20 × 10 3 V/mm depending for different glass spheres.
Weight loss and friction coefficient prediction models for polyamide-6 (PA-6) composites filler with 0,5 and 10 wt.% wollastonite (W) particles was developed using Taguchi method by considering the parameters of sliding speed, applied load and filler ratio. The wear behavior of the specimen was investigated using pin-on-disc arrangement where the samples sliding against a AISI 4140 steel disk under different conditions. The wear tests were realized at the sliding speeds of 1.0, 1.5 and 2.0 ms-1 and under the loads of 6, 10, and 20 N. The obtained weight loss for with 5 and 10 wt.% wollastonite (W) particles PA-6 composites are lower than pure PA-6 weight loss under the same test conditions. The orthogonal array, signal-to-noise ratio (S/N) and analysis of variance (ANOVA) were employed to study the optimal testing parameters on composite samples. The estimated S/N ratio using the optimal testing parameters for specific wear rate were calculated and a good agreement was observed between the predicted and actual weight loss for a confidence level of 90%.
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