Automotive bumper beam in the following is same as that of Assignment-01. 100 Z Material properties of C-section beam: 600 lateral translational motion Assuming uniform section properties along the length, and rigid connections at both ends of the beam, estimate (with hand calculations) the following properties: E=70 GPa; v=0.33 p=2.7x10-6 kg/mm (1) Extruded aluminum C-beam of uniform wall thickness: 4 mm (2) Lateral bending stiffness (total lateral force= p*L) for unit maximum deflection at mid-span Effective mass for lateral bending mode vibration (assume: 2/ *total mass) (3) vibration frequency value for lateral bending mode Assume fixed/fixed at both ends 600 3D FEA shell model of the thin-walled beam, for ABAQUS analysis, is given in ASCII text file: "CBeamFreq.inp". Used units are: force - kN, dimension - mm, time ms, mass - kg. Submit the model to ABAQUS and find the frequency of 1st mode in the output data file "CBeamFreq.dat". Frequency value (f) in ABAQUS result file is reported as "cycle/unit time"; where time unit will be "ms" for this model. Examine the "effective mass" values in text output data file "CBeamFreq.dat" and determine the nature of the 1st two vibration modes predicted by the FEA model. Which of these two mode appears to be a lateral bending mode as assumed in hand calculations? Verify the conclusion by plotting the mode shapes of ABAQUS model results (import the ABAQUS result file CBeamFreq. ODB in HyperView to visualize the mode shapes). Explain the reason for difference between frequency values of hand calculation and FEA model.