Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
ANALYSIS OF THE CYCLIC BEHAVIOUR OF SINGLE LAP METAL/COMPOSITE JOINTS AT ELEVATED TEMPERATURES
Submission Author:
Camila Ranucci de Luca , RJ , Brazil
Co-Authors:
Camila Ranucci de Luca, Eduardo Pereira Motta, João Marciano Laredo dos Reis, Heraldo da Costa Mattos
Presenter: Camila Ranucci de Luca
doi://10.26678/ABCM.COBEM2019.COB2019-0501
Abstract
The present paper aims to investigate the progressive accumulation of inelastic displacement observed in single lap metal/composite joints under ultra-low fatigue cycles. The joint was fabricated using a polyurethane based composite reinforced with fiberglass, attached to an ASTM A1020 metallic surface using an epoxy adhesive. Experiments were performed using two distinct force amplitudes with three different loading rates each, and they revealed that the displacement hardening induced by inelastic displacement is strongly rate-dependent. Also, the experiments demonstrated a direct relation between the load rate and the total amount of cycles until failure, as higher the load rate, the joint was able to sustain a superior number of cycles before failure, what suggests an elasto-viscoplastic behaviour. This article proposes a preliminary mechanical model that can describe the cyclic behaviour for an arbitrary load history. The kinematic hardening evolution with the inelastic displacement is much more significative than the isotropic one, which enables to identify experimentally all material parameters arisen from theory, performing load-unload tests using flat specimen. A reasonable agreement was obtained between numerical and experimental results
Keywords
Ratcheting, Hysteresis, Ultra-low cycle fatigue, single lap joint, Elasto-viscoplasticity
