Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
SE(B) specimens under 4-point bending - recommended roller span and solutions for KI and elastic compliance
Submission Author:
Gustavo Henrique Bolognesi Donato , SP
Co-Authors:
Gustavo Henrique Bolognesi Donato, Kaue Lucon Carvalho, Victor André Lucas Göltl
Presenter: Gustavo Henrique Bolognesi Donato
doi://10.26678/ABCM.COBEM2017.COB17-2508
Abstract
This work aims to evaluate and develop good practices for fatigue crack growth and fracture toughness testing of SE(B) specimens loaded under 4-point bending. Specifically, this study: i) investigates the most appropriate upper rollers’ span based on applied loads and Hertzian stresses; ii) and develops numerical solutions for KI and elastic unloading compliance (C) considering varying loading schemes and geometrical features. The aforementioned solutions derive from highly refined finite element models including 3D effects and containing cracks - the results are compared to available data from the literature in order to validate the methodology and to improve the knowledge in the field. The obtained results revealed that, considering the studied conditions, the recommended span between upper rollers is L = W, which minimizes local indentation and stress disturbance in the near-tip crack region, while at the same time guarantees high bending moment to induce severe crack driving forces. Both KI and elastic unloading compliance solutions could be obtained as expected, but formulae (or normalization approaches) for SE(B) under 4-point bending differ from those available for 3-point bending, thus deserving attention and further experimental validation.
Keywords
SE(B) specimens, 4-point bending, rollers' span, Elastic unloading compliance, KI
