Security expert Chris Nickerson is often asked by clients to conduct penetration testing of their on-site security. Watch Nickerson and his team pull off a $24,000 heist in this video.http://www.csoon

ME 6180 – Additive Manufacturing Summer 2018 Homework 4 Due date : July 6 , Fri day 5:00 pm in PILOT dropbox 1. Consider that you are using an extrusion based ABS printer . Calculate the required heater power, total pressure drop in liquefier , and motor power for extrusion at steady state condition for deposition speed of 0. 5, 1, 1.5, 3, 5, 10, and 50 mm/s and plot them on three separate graphs. Use the following data: m = 2.16  = 7.4 x 10 -5 (kPa) -m s-1  = 900 kg/m 3 cp = 1500 J/ kg -K D1 = 1.8 mm L1 = 10 mm Some required data is missing that can be found from literature. 2. The generalized heat equation for laser melting is given by = [ ]+ [ ]+ [ ]+ ( + + )+ where Reduce the above equation for steady -state thermal analysis of a system having a stationary heat flux and no -heat generation. Then solve the following problem: Consider a case where the surface of a metal plate is irradiated by a stationary laser so that the steady -state temperature near the laser -irradiated region of the top surface is defined by an exponential function given in the figure below. The remaining boundaries are maintained room temperature (23 oC). Consider k x = 50 W/m 2-K, k y = 60 W/m 2-K, and grid sizes x = 0.6 mm , y = 0.5 mm. 1. Derive finite difference equations for all the interior nodes. 2. Develop a MATLAB code, and determine temperatures at all interior nodes .