14th International Conference on Shot Peening

Improvement of the fatigue life of lattice structures covered by a thin envelope for biomedical applications

Tania Solaa, Laurent Weissb, Pascal Laheurtec, Eric Fleury

LEM3, Université Lorraine, 7 Rue Félix Savart, Metz, France – tania.sola-saiz@univ-lorraine.fr

LEM3, Université Lorraine, 7 Rue Félix Savart, Metz, France – laurent.weiss@univ-lorraine.fr

c LEM3, Université Lorraine, 7 Rue Félix Savart, Metz, France – pascal.laheurte@univ-lorraine.fr

d LEM3, Université Lorraine, 7 Rue Félix Savart, Metz, France – eric.fleury@univ-lorraine.fr

Introduction

Introducing compressive residual stresses allows enhancing the fatigue life of pieces. Ultra shot-peening processing or SMAT (Surface Mechanical Attrition Treatment) introduces residual stresses and provides an interesting treatment for additive manufactured hip prosthesis (SMAT avoids machining the manufacture raw parts). Moreover, nowadays, with the aim to developing light but high resistance products, additive manufacturing enables the fabrication of prosthesis composed of architectural lattice structures of various geometries.

Objectives

The lattice structures are of interest in various fields, and this study aims to apply them to the biomedical sector, particularly to the prosthesis manufacturing. Thus, the new generation of prosthesis are designed with internal lattice structure covered by an envelope. This type of structure allows better mechanical adaptation and good osseointegration, as well as a high-quality fixation of implants [1]. The objective of this study is to understand the effects of the orientation of the lattice structures and the effects of SMAT on the envelope on the fatigue life of Ti-6Al-4V parts produced by additive manufacturing.