Characteristics of Separations in Fracture After Crack Tip Opening Displacement Tests of Low-Carbon Microalloyed Offshore Steel S460MLO
Open Access
Abstract
Using the results from testing industrial batches of 23 mm steel heavy plates after thermomechanical rolling and subsequent post-weld heat treatment, the patterns of fatigue crack formation in the fracture specimens during CTOD (Crack Tip Opening Displacement) testing for fracture toughness are investigated. Visual, microstructural, and fractographic studies of the nature of fracture formation and the surface of the secondary separations have been conducted. The probable causes of the manifestation of the potential “pop-in” effect on the load–displacement diagrams of the notch opening displacement are described, as well as its potentially negative impact on the interpretation of test results.Keywords
This publication has 14 references indexed in Scilit:
- Effect of notch shape on the fracture toughness behaviorInternational Journal of Naval Architecture and Ocean Engineering, 2025
- Significance of separations occurring in mechanical testing of thermomechanical rolled pipeline steelsJournal of Pipeline Science and Engineering, 2022
- Effect of residual stress modification technique on CTOD test results in heavy thick welded jointsWelding International, 2021
- Evaluation of CTOD resistance curves in clamped SE(T) specimens with weld centerline cracksEngineering Fracture Mechanics, 2020
- Influence of hydrogen on the microstructure and fracture toughness of friction stir welded plates of API 5L X80 pipeline steelInternational Journal of Hydrogen Energy, 2019
- Review of fracture toughness test methods for ductile materials in low-constraint conditionsInternational Journal of Pressure Vessels and Piping, 2016
- Assessment of Pop-in Significance in Heterogeneous Weld Heat-affected Zone Using Finite Element AnalysesProcedia Materials Science, 2014
- Relationship of failure energy and amount of ductile component in a fracture during the DWTT for rolled plate prepared by controlled rollingMetallurgist, 2012
- Effects of finish rolling temperature on inverse fracture occurring during drop weight tear test of API X80 pipeline steelsMaterials Science and Engineering: A, 2012
- Determination of fracture parameters (K Ic s and CTODc) of plain concrete using three-point bend testsMaterials and Structures, 1990