阀瓣硬度对制动性能的影响外文文献.pdfVIP

Engineering Failure Analysis 74 (2017) 228–238 Contents lists available at ScienceDirect Engineering Failure Analysis journal homepage: www. elsevier. com/ locate/engfai lanal Effect of disc hardness on MR brake performance K.P. Lijesh a,⁎, Deepak Kumar a, Harish Hirani b a Mechanical Department, Indian Institute of Technology Delhi, India b Central Mechanical Engineering Research Institute, Durgapur, India a r t i c l e i n f o a b s t r a c t Article history: The online control of frictional force using MR fluid makes Magneto-Rheological (MR) brake an Received 12 June 2016 attractive option to replace the conventional disc brake. However, initial experiments on MR Received in revised form 27 November 2016 brake showed deterioration in the braking performance with time. To understand the science, Accepted 9 January 2017 the disc was investigated using the 800× microscope and concluded wear of disc as the cause Available online 16 January 2017 of brake-performance deterioration. To overcome this problem, disc with higher hardness was proposed. Initially experiments using “block on disc setup” were performed. The blocks of Keywords: 15HRC, 30HRC, 50HRC and 57HRC hardness were used. The performance of the experiment MR brake was evaluated by measuring the weight loss of the blocks before and after the tests. To validate MR fluid