Effect of Material Anisotropy on Thermal-Mechanical Instabilities in Metal Free Friction Materials Joseph-shaahu Shaahu, Kingsford Koranteng, and Yun-Bo Yi Department of Mechanical and Material Engineering University of Denver Denver, CO 80208, USA An anisotropic ceramic matrix composite (CMC), which consists of a silicon carbide (SiC) based ceramic matrix reinforced with carbon (C) fibers, is considered as a metal free friction material replacement in brake and clutch applications. The fibers are assumed to have circular cross section, arranged unidirectionally and packed in a rectangular array without the presence of voids. The rule of mixture showed the C-SiC composite to be transversely isotropic with the circumferential plane as the plane of isotropy. A set of parametric studies have been performed to computationally investigate the dominant parameters that affect thermal-mechanical instabilities.
Decoding Genuine Ceramic Pad Formulations - materials and processing Bharat S. Tomar, Dr. Sharafat Ali, Dr. Keith Ellis, Yogesh Chaudhary Allied Nippon Private Limited, Sahibabad, Ghaziabad 201010, UP, India --------------------------------------------------------------------------------------------------------------- ABSTRACT The need for development of genuine ceramic composite for PV application arose to overcome the challenges associated with traditional semi-metallic pads. The main focus is to achieve better performance, pad and disc wear along with low dust in comparison to semi-metallic pads. In general, brake pads convert kinetic energy to thermal energy through friction and operating temperature in semi-metallic brake pads is higher due to presence of steel having high thermal conductivity. Over the last decade, the customer preference has moved over to ceramic pads due to light coloured pad surface, low disc and pad wear and low dust in comparison to semi-metallic pads.
Clutch characteristics play a vital role in ensuring a smooth and comfortable customer experience of any vehicle. The expectation is to have an optimized clutch pedal effort, reduced pedal travel, adequate modulation zone and a smooth and quick pedal returnability. However, achieving all these customer requirements is extremely challenging in some cases. In the present work, the authors discuss on improving the clutch pedal characteristics of a compact sports utility vehicle (SUV by adapting a unique approach of combining a dual torsion spring (DTS) and a return spring (RS). DTS is widely used in the clutch pedal to improve the pre-load at zero travel (1.5 kg to 2.0 kg) to improve the pedal returnability in the free-play zone. Moreover, it is also quite helpful to reduce the peak pedal effort by giving a positive assistance.
The purpose of this experimental investigation is to determine the optimized geometry for the combustion bowl of invariant speed compression ignition engine operated with biodiesel. The sesame biodiesel has been considered for the current proposed work. To enhance the performance characteristics and reduce the emission magnitudes, the sesame methyl ester of 20% blended with diesel fuel of 80% (S20-D80).The nanoparticle additive of titanium oxide at the rate 0f 25 ppm was added to the blend (S20-D80+ 25 ppm). Furthermore improvement in performance of the engine, two diverse combustion bowls was designed with respect to various literature studies.Toroidal U- shape combustion bowl (MP-i) and Toroidal Stepped V-shape combustion bowl (MP-ii) were selected for the current study.The engine performance, combustion and emissions has been analyzedon both modified piston bowl and compared with the standard piston.