e-ISSN: 2582-5208 International Research Journal of Modernization in Engineering Technology and Science Volume:02/Issue:12/December -2020
Impact Factor- 5.354
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SELECTION OF SHEET METAL BASED ON CURRENT DENSITY FOR INDUSTRIAL APPLICATION Tanmoy Bera*1, Shiromani Dhar Diwedi*2, Yashika Joshi*3 *1PEC
University of Technology, Chandigarh(UT), India *2CIPET,
*3Graphic
Lucknow, India
Era Deemed University, Dehradun, India
ABSTRACT When it Comes to selection of Conducting material for electro-mechanical application we need to know the current density (J) of the conductor. As Current density is the measurement of current flowing through a specific cross-section area of a conductor. Therefore, we need to determine how much current (I) can pass through the specific cross-section (A) without reaching the melting point of the conductor. So, that the product is more reliable and robust. To set a criterion for selection we investigated by performing Design of Experiment with 4 Conductors used in automobile industry namely ETP-Copper (Cu-ETP), Phosphor Bronze (Pb), Brass and Steel. Various values of Current were made to flow through each material and temperature rise reading was recorded. We analyzed the observation and plotted a graph of Temperature Change (ΔT) Vs Current (I) which helps to determine the Current Density value w.r.t Temperature Change. Using the Current Density value an engineer can further research and calculate the Maximum Current that can flow the minimum cross-section of the Conductor.
I.
INTRODUCTION
We see many Market Quality problem reported due to heat generated in a conductor and melting the thermoplastic associated with it through Injection Molding. The root cause for the failures is the material selection was not as per the current carrying capacity requirement. A materials Current Carrying capacity is defined by its property of Current Density (J), which depends upon Current (I) and Area of Cross-section (A). The empirical formula is:
To Calculate the maximum Current (I) which can flow through conductor, An Researcher/Designer must know the material property i.e., Current density (J) and Minimum area of Cross-section (A). Cross-section is controlled designed parameter can be reduced or increased as per the requirement. But Current Density of a material remains unknown as any amount of current can be passed through the conductor but leading rise in temperature. Hence, the Researcher cannot determine the allowable current that can flow through the Material for safe application. Therefore, through this experiment we were able to determine the Current Density as per the allowable temperature rise in the part or product.
II.
METHODOLOGY
To establish a criterion for selecting sheet metal based on current density we conducted Design of Experiment and analyzed the results. For this we made strips of Copper, Phosphor Bronze, brass and Steel were wire cut in dumbbell shape. And current was made to pass through it while recording the Temperature rise. Input Design Values: • Input voltage 12V • Input Current 11. 22, 33, 44, 55 and 66A • Copper Strip (as per IS 1897) /Brass Strip (as per IS 410)/Steel Strip (as per IS 513) of 3 mm2 cross-section & Pb Strip (as per IS 7814) of 2.4mm2 • wires with cross-section 4mm2
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