Recent content by M_Abubakr

Hi, I am trying to find equation of motion and its solutions for a 2D infinite lumped mass spring system as depicted in figure. All the masses are identical, All the springs are identical, and even the horizontal and vertical periodicity is the same n=a. I need to try find dispersive relation...

How do I get the wave dispersion for a 2D continuum unit cell subjected to a periodic boundary which is excited longitudinally? I'll be applying forces in ABAQUS with varying frequencies. I have come across Blochs theorem but I can't find any application of it in continuous systems. Every...

Thank you. I think I'm done with this part but just want to make sure if I did it correctly. I did something like this. Is this correct?

Yes its a 2D shell in a 2D space. I think I understand much of it now however I still have two questions. I understand that when I put a constraint equation between two nodes on the opposite faces of an object in x-direction, I am telling those nodes that if the first one moves in...

I tried using micromechanics and Easy PBC plugin to generate PBC and I got the same error from both of them. Error in job NF: 813 nodes are missing degree of freedoms. The MPC/Equation/kinematic coupling constraints can not be formed. The nodes have been identified in node set...

Are you saying that I have to do this for each node? Like I have one node on the front face U1 and another node on the opposite face U2 and their difference should be zero at all times. I'm doing it in ABAQUS now. The mesh is completely identical on opposite sides. I tried using Easy PBC but it...

Hi I have a project regarding micromechanics of composites. I'm starting my analysis on the Fiber Matrix RVE. Right now I'm trying to find the natural frequency of the unit cell. The Unit cell has some unique geometry which I will keep on changing to see how natural frequency changes. I have...

This project is stressing me out along with other workload and I'm in panic mode right now. The brief of the project is in the attachment. I can interpret 4 objectives out of this: (1) Analysing the relation of the physical parameters in the composite material with the characteristics of wave...

Homework Statement At the top of a mountain the temperature is -5 degree C and a mercury barometer reads 566 mm, whereas the reading at the foot of the mountain is 749 mm. Homework Equations Assuming a temperature lapse rate of 0.0065 K/m and R = 287 J/kg K, calculate the height of the...

Homework Statement Consider beam “A-B” and strut “C-D” from Figure QA1. The beam “A-B” is hinged at point “A” and hinged with strut “C-D” at point “C”. It has an applied force of 8 kN applied at point B as shown in Figure QA1. Strut “C-D” is hinged at point “D” and it is also hinged with beam...

Hi my name is Abubakr, I'm new here. I'm a level 1 Mechanical Engineering Student.