For each problem, I will grade not just for the mathematical solution but also f
ID: 2086432 • Letter: F
Question
For each problem, I will grade not just for the mathematical solution but also for these aspects: A clear statement of the assumptions and method used for solution Final validation of assumptions), if necessary A reflection on whether the numerical answers are reasonable . 1. You have been assigned to develop processing parameters for bonding together two sheets of metal using a thermosetting resin that fuses and forms an acceptable bond at a characteristic temperature for the selected resin. The process, as schematically shown in the figure, involves pressing the two sheets with a thin layer of the adhesive between them using heated dies. You need to set up a method to calculate the process time for which the sheets need to be held in the press to achieve an acceptable bond with the thickness of the sheets, their initial temperature, and their material properties as inputs into the calculation. You may assume that the sheets are of equal thickness and that there is perfect thermal contact between the die and the sheet ie 2b Adhesive layer Die a. Write a problem statement in your own words b. What approach would you take to set up a method for determining the process c. Describe the steps needed for the calculation. d. Apply the method to calculate the process time for the situation in which 304 time? What assumptions would you need to make? stainless steel sheets that are 4 mm thick and are initially at 20°C are bonded with a resin that needs a setting temperature of 170°C. The dies are at 225'c The thermal diffusivity of the sheet material is 2.15 x 10 cm2/s OE10 em). initally at 1200K, is held inExplanation / Answer
For joining of two sheet of metal a thin layer of thermosetting resin of specific bonding temperature is needed to apply between two sheets. These two sheets are held between two heated dies whose material properties and initial temperatures are known. Then find out the time require to achieve acceptable bond temperature.
b) From the material properties we can get the thermal conductivities of dies and sheet. By knowing the dimensions we will able to find out the surface area of contact between dies and sheet. By using thermal diffusivity of sheet metal we can find the penetration of heat. And finally by applying Fouriers law of heat conduction we can able to find out the interface temperature which is nothing but the temperature of thermosetting resin. We will calculate the time require for these process by using transient heat conduction phenomenon.
Assumptions: 1)Temperature distribution between die and sheet material should be uniform.
2) there should be perfect contact between die and sheet.
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