Etudes numérique et expérimentale des grandeurs mesurables en indentation sphérique: influence du frottement et du mode d'écrouissage du matériau

Olivier Bartier (1) , Stanislaw Kucharski , Gerard Mauvoisin (1)

1 LGCGM - Laboratoire de Génie Civil et Génie Mécanique

The experimental results of spherical indentation obtained on globulized carbon steels are compared with those obtained numerically. The study of the indentation curves shows that friction has an negligible influence on the loading curve and a weak influence on the unloading curve. The numerical simulations show that isotropic or kinematic hardening has a considerable influence on the unloading curve. The unloading curves exhibit a greater curvature in the case of a kinematic hardening especially on the final part of theses curves. The study of the morphology of the imprints confirms this result. The imprint geometry obtained numerically shows that pile-up is slightly influenced by the type of hardening and strongly influenced by friction. The pile-up decreases with the increase in the friction coefficient. This study shows that finite elements simulations carried out by considering an isotropic elastic-plastic behavior, with kinematic hardening and a non-zero friction coefficient between the indenter and the indented material, make it possible to obtain numerical indentation results very close to those obtained in experiments.

Keywords: Spherical indentation; finite element method; experimentation; indentation curve; imprint geometry

Domains: Engineering Sciences [physics]

Olivier Bartier, Stanislaw Kucharski, Gerard Mauvoisin. Etudes numérique et expérimentale des grandeurs mesurables en indentation sphérique: influence du frottement et du mode d'écrouissage du matériau. Matériaux & Techniques, 2008, 96 (hors série), pp.59-70. ⟨10.1051/mattech/2009016⟩. ⟨hal-00861798⟩