A Study On Effect Of Laminated Rubber – Metal Spring On Tensile And Hardness

Mohamed Razak, Mohamad Ikhwan (2019) A Study On Effect Of Laminated Rubber – Metal Spring On Tensile And Hardness. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This project is to promote SMR CV-60 as the most important substance in the development of laminated rubber metal spring (LR-MS). In order to investigate the compatibility of SMR CV - 60 as the main substance in LR-MS development, the hardness and the young modulus of SMR CV - 60 at various force (0.1, 0.2, 0.4, 0.6, 0.8, 1.0, 1.2, 1.4 and 1.6) mN are to be investigated. This thesis will describes in details the methodologies that have been used during conducting the nanoindentation testing. In order to achieve this objective, a nanoindentation test was conducted to obtained mechanical properties for NR which is SMR CV-60 in 3 different types of NR conditions which is normal test, tensile test and heat treatment before conducting nanoindentation test. The normal test refer to original condition of rubber without any testing before using nanoindentation test. Tensile test was conducted at room temperature by stretching the specimen at rate of 100, 200 and 300 mm/min before conduction nanoindentation testing. Heat treatment was carried out at temperature of 100 and 200 before conducting nanoindentation testing. The reason to conduct 3 test above was to determine the hardness and young modulus for before and after test. For normal test, the depth penetration increase as the force increase. The hardness/young modulus is unpredictable as the force increase but graph showing an increasing trend for hardness value. For tensile test 100, 200 and 300 mm/min, the depth penetration also increase as the force applied increase where the hardness/young modulus decrease after tensile test have been done to SMR CV-60. Lastly, for heat treatment, the depth penetration also increase as the force applied increase. For sample 9 where heat treatment at 100, the hardness decrease after heat treatment for both sample 9 and 10 but young modulus remain unchanged after heat treatment.

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