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[chand1127]

 

 

[peteroznewman]

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[chand1127]

 

 

Hello everyone,

    Can anyone help me to calculate the contact area after deformation in the Transient Structural Analysis?

 

                                                                                                                                        

 

As shown in the Figure 1, the length of the body1 (slider) is L₁=1280 μm, the length of the body2 (fixed) is L= 5120 μm, breadth of the both top and bottom bodies is w₁ = 640μm the maximum peak radius of the peak is r=80 μm respectively and surface peak apex (s) =25, sliding speed v=1.024 m/s, height of the peak is 100 μm and difference between the peaks is 0.256 μm.

    

Pressure is applied on the top surface of the slider. Displacement is applied on the one face of the slider. Fixed support is applied to the bottom surface. In the simulation, the upper slider is set as the follower, and a uniform pressure (P) is received in the y-axis direction, the sliding speed (V) is given in the x-axis direction, and the lower slider is set as a smooth flat fixing member.

When the upper and lower sliders are in contact, the upper slider is in contact with the smooth surface of the lower slider by the rough peak, and the upper and lower sliders generate heat due to friction when the relative motion is performed and the heat is concentrated on the surface portion of the peak contact. And the surface of the wave is transmitted to the surroundings and the interior. 

  

In this, we will analyze the change of the contact surface of the upper slider and the internal value of the contact peak.

                                                   

                                                                                      Figure.4 Before loading Contact area status

As shown in Figure.4, Before Loading the contact status is point contact, it’s radius is r=80 μm and it’s height of the peak is 100 μm and after loading the contact status is face contact after deformation as shown in below Figure.5.

                                             

Figure.5 After loading Contact area status

How to calculate the contact area after deformation. 

 

 

[chand1127]

" alt=""> Fig.1  Conatact Gap 

 

" alt="">Fig.2 r=80 μm ,h= 8μm.

2.337608

1.833496

1.288224

0.815752

0.413325

0.079117

0

0

0

[peteroznewman]

Export the contact pressure results including the nodal coordinates.

In matlab, contour the zero pressure boundary, then measure the area within the zero pressure contour.

[chand1127]

Thank you, sir, I will approach your idea.

 

[chand1127]

 Hello sir, In below i am attached my nodes and pressure values, if you don't mind can you help me how to plot the contour the zero pressure boundary, then measure the area within the zero pressure contour in the Matlab.

 

Nodes
Pressure (MPa)


17955
0


17964
0


17973
0


17982
64.956


17991
161.67


18000
396.65


18009
874.03


18018
1878.8


18027
2889.5


18036
2986.5


18045
2875


18054
3541.5


18063
2749.3


18072
2166.6


18081
873.91


18090
423.32


18099
174.42


18108
79.168


18117
0


18126
0


18135
0

[peteroznewman]

 The list above is useless. You must export the pressure with Nodal Coordinates. Please insert an image of the Pressure plot from Mechanical with the elements visible.