Analysis of Contact of a Rigid Sphere Against a Deformable Flat

Abstract

<p>In the paper the strain hardening effect on the contact of a rigid ball and elastic-plastic flat is considered using experiments and finite element method. The experiments were carried out for DC04 steel sheet metal. The flat samples of 20 mm width and 200 mm length were straightened using uniaxial tensile test to receive different strain values: 5, 10, 15, 20, 25 and 30%. The indentation tests were performed using a modified Zwick Roell Z030 operated in the compression mode. The diameter of bearing steel indenter was 6 mm. It was found that the strain hardening phenomenon and anisotropy of material have a great influence on the ball indentation value and the maximal indentation force. The linear dependence between the normal load and penetration depth is observed. Furthermore, it was found that the value of penetration depth for specific force value decreases non-linearly with the increase of sample strain. Pre-strained samples cut transverse to the rolling direction exhibit higher deformation resistance than samples cut along the rolling direction. The springback analysis in ABAQUS is executed for studying the actual indentation depth after the indenter is unloaded.</p>

Polynomial Multiple Regression Analysis of the Lubrication Effectiveness of Deep Drawing Quality Steel Sheets by Eco-Friendly Vegetable Oils

“…During contact, the surface roughness of the cooperating elements changed until the so-called equilibrium roughness was reached. As was found by Trzepieciński et al [ 48 ], during the loading of the rough sheet material, only the asperities of the surface were deformed to some extent. Increasing the normal load caused plastic deformation occurring in the subsurface, some distance below the roughness profile, while the surface asperities did not undergo further deformation.…”

Evaluation of abrasive mechanisms in metallic alloys during scratch tests: a numerical-experimental study in micro-scale.

“…Hard materials had a better fitting when compared with the soft materials, presumably because of their different work-hardening behaviour during the scratch test. The same linear relation was verified by means of the microscratch test using a diamond tip against AISI 1070 carbon steel and gray cast iron (SERIACOPI, 2017), and by indentation of DC04 steel used to make bearing steel balls (TRZEPIECIŃSKI et al, 2015).…”