Observing Plastic Deformation on a flat plate due to external pressure

Observing Plastic Deformation on a flat plate due to external pressure

Kedar Kapadnis

Geometry setup and cleaning

Fig 1

The model is reduced to the above size after identifying planes of symmetry in order to reduce meshing size as well as computation time and power consumption

Meshing

Fig 2 (Standard meshing – default mesh)

Contacts – Frictional contact assigned from Sphere to Plate with a coefficient of friction = 0.74 (selected from Roymech tribology tables for steel to steel contact)

Supports – Bottom face of plate is fixed

A 4-step displacement from 0 to -4mm is assigned to the sphere along Y direction

Post Processing

Directional def (along y)

Eq. Stress on plate

Strain on sphere

Parameters	Max	Min
Directional Deformation	0.329 mm	-3.3857 mm
Equivalent strain (on plate)	2.01%	0.0465%
Equivalent stress (on plate)	3296.6 MPa	35.071 MPa
Equivalent strain (on sphere) mm/mm	6.47x10-6	-

The above data and analysis explain that the plate gets significantly (and permanently) deformed due to the force applied by the sphere. This is observed as the plate is assigned a non-linear behavior and experiences plastic deformation due to the movement of the sphere as noticed by the maximum stress faced by the plate (which is way beyond the elastic limit).