Experimental and numerical analysis of aluminum-aluminum bolted joints subject to an indentation process

• Published in: International journal of fatigue Vol. 80; pp. 332 - 340
• Main Authors: Fragapane, S., Giallanza, A., Cannizzaro, L., Pasta, A., Marannano, G.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.11.2015
• Subjects: Aluminum; Aluminum base alloys; Bolted joints; Fatigue; Fatigue (materials); Fatigue failure; Finite element analysis; Indentation; Indentation process; Mechanical properties; Numerical analysis; Plastic deformation; Residual stress; Single-lap joint; Fatigue; Single-lap joint; Finite element analysis; Residual stress; Indentation process
• ISSN: 0142-1123; 1879-3452
• DOI: 10.1016/j.ijfatigue.2015.05.023

•Mechanical performances of aluminum–aluminum single-lap bolted joints are studied.•An indentation process creates a residual stress field around the hole.•Several static and fatigue tests are conducted.•Several numerical analysis with explicit solver are performed.•The indentation process increases the fatigue life of bolted joints. The increasing interest of the industry (especially automotive, aviation and marine) in the fastener joints (riveted, bolted, etc.) between metallic materials, has re-opened the study on the possibility to improve the performance of the drilled structure using plastic deformation processes. Indentation process, performed before the drilling operation, creates circumferential compression stresses around the hole which increase significantly the mechanical performance of the drilled structures. In this paper, static and the fatigue performances of aluminum–aluminum (AW 6082-T6) single-lap bolted joints are studied. In particular, the study compares the mechanical strength of only drilled single-lap bolted joints (OD specimens) and single-lap bolted joints subject to an indentation process (IP specimens). In order to determine the cycles to failure and the corresponding Wöhler diagram, several fatigue tests are performed. The analyses allow to determine the mechanical performance and the failure mode of the analyzed joints. Several numerical analysis, conducted in ANSYS environment on three-dimensional models of the single-lap joint, are focused on the evaluation of the residual stress on the indented plate and, in particular, to compare the stress distribution on both type of analyzed joints.