Evaluation Of Slit Parameter Of Ferromagnetic Material Based On Magnetic Flux Leakage

Ambran, Muhammad Abid Muttaqin (2020) Evaluation Of Slit Parameter Of Ferromagnetic Material Based On Magnetic Flux Leakage. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Evaluation and testing the quality of materials are vital importance in order to maintain the productivity of materials, which could have an impact on safety and reliability of the material used. Nondestructive testing (NDT) method, which is a process of evaluating the defects on material without destroying or harming the system is used in this project due to their advantages of retaining the material’s properties without causing damage. To promote the evaluation of defects on ferromagnetic materials, magnetic flux leakage (MFL) method is commonly used, which is reliable for crack detection. However, the requirement of magnetizing objects in traditional MFL method limits their applications in some condition. Hence, metal magnetic memory (MMM) method which is recently proposed by the researchers is chosen in this experiment because of their advantages of easy to operate and is more sensitive to stress.MMM method is highly effective in assessing the extent of early damages such as fatigue cracks in the ferromagnetic components because of the existence of stress concentration zone. The main purpose of this project is to evaluate the slit parameter of ferromagnetic material based on MFL. For this project, SAE 1045 carbon steel is used as the specimen due to its good machinability and offers lower cost compared to the other materials. The 3D view of the specimen models, with different slit depth and slit length are drawn by using SolidWorks software and then finite element analysis is applied to the models of the specimen. During the analysis, 100 N of tensile force is applied to the right end of the models to get the distribution of stress concentration on the models. Then, the results of stress concentration and Von Misses stress acting on the models is tabulated and graphically presented. From the results obtained, the stress concentration will increase when the slit length and slit depth increase. However, the results proved that the slit depth gives more influence to the stress concentration than the slit length. For examples at the v same length (5 mm) but with different depth, the value of the Von Mises stress increase much higher from 1.544x10⁶ N/m² to 1.724x10⁶ N/m² at 1 mm and 1.5 mm depth respectively. In contrast, at the same depth (1 mm) with different length of the slit, there are just a small increment in the value of the Von Misses stress which is from 1.544x10⁶ N/m² to 1.555x10⁶ N/m² at 5 mm and 10 mm length respectively. Then, comparative study is conducted to study and compare the results obtained from the finite element analysis with the previous study. From the comparative study, it is validated that the results of the finite element analysis are similar with the existed experimental results from previous study. Therefore, the coincidence confirms that the MFL method can be used in the evaluation of the slit parameters of ferromagnetic material.

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