Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
Numerical Study of the Relationship Between the Load Applied by the Bolt and the Stress Intensity Factor in a Modified-WOL Specimen
Submission Author:
Emerson da Trindade Marcelino , PB
Co-Authors:
Emerson da Trindade Marcelino, Jorge Antonio Palma Carrasco, Nadège Bouchonneau, Jose Maria Barbosa
Presenter: Emerson da Trindade Marcelino
doi://10.26678/ABCM.COBEM2021.COB2021-1041
Abstract
The Modified-WOL specimen is a compact, bolt-loaded device used for fracture toughness tests of engineering materials in environment-assisted conditions, which provides the Threshold Stress Intensity Factor for Environment-Assisted Cracking, KIEAC, value with one specimen only. Its internal bolt yields a constant notch opening, requiring a clip gauge to measure this displacement inside the environmental chamber to calculate the initial KI applied. However, corrosion reactions with the environmental solution limits the use of clip gauge. So, this work aims to propose a method for the specimen’s setup based on a correlation between the load applied by bolt and the KI by three- and bi-dimensional simulations with the Finite Element Method. With the three-dimensional simulation, we obtained the corresponding load reactions and opening displacements for each bolt rotation. From these results, we did theoretical KI calculations. With those load values, bi-dimensional simulations were performed to obtain numerical KI and validate the three-dimensional modeling. We obtained correlation equations from the numerical results to estimate the amount of bolt rotation and bolt load needed to apply a desired value of KI at the crack front. The results indicated that the numerical model used is appropriate to simulate the specimen's setup, achieving acceptable errors.
Keywords
Modified-WOL specimen, Bolt-loaded specimen, Finite Element Method, Environment-Assisted Cracking
