A CTOD equation based on the rigid rotational factor with the consideration of crack tip blunting due to strain hardening for SEN(B)

Khor, WeeLiam

doi:10.1111/ffe.13005

Cited by 4 publications

(1 citation statement)

References 21 publications

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“…A different approach is presented in ASTM [10] and ISO [11], where an energy-based concept is the basis for CTOD evaluation. Recent research by Kawabata et al [14] and Khor [15] resulted in modification of the CTOD formulas in the ISO 12135 standard, 2021 edition.…”

Section: Fig 2 Principle Of the Ctod Testmentioning

confidence: 99%

Influence of Material Thickness on the Ductile Fracture of Steel Plates for Shipbuilding

Kowalski

Kozak

2022

Polish Maritime Research

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In the shipbuilding industry, the risk of brittle fractures is relatively high because some units operate in arctic or subarctic zones and use high thickness (up to 100 mm) steel plates in their structures. This risk is limited by employing certified materials with a specific impact strength, determined using the Charpy method (for a given design temperature) and by exercising control over the welding processes (technology qualification, production supervision, and non-destructive tests). However, for offshore constructions, such requirements may prove insufficient. For this reason, regulations employed in constructing offshore structures require conducting crack tip opening displacement (CTOD) tests for steel and welded joints with thicknesses exceeding 40 mm for high tensile strength steel and 50 mm for other steel types. Since classification codes do not accept the results of CTOD tests conducted on specimens of sub-sized dimensions, the problem of theoretically modelling the steel construction destruction process is of key importance, as laboratory tests for notched elements of considerable thickness (100 mm and higher) are costly and problems stemming from high loads and a wide range of recorded parameters are not uncommon. The aim of this research is to find a relationship between material thickness and CTOD value, by establishing and verifying a numerical model that allows recalculating a result obtained on a sub-size specimen to a full- size specimen for a ductile fracture mode. This work presents results and conclusions from numerical modelling and compares them with laboratory test results of the elastic-plastic properties of high thickness steel, typically used in offshore applications.

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Section: Fig 2 Principle Of the Ctod Testmentioning

confidence: 99%

Influence of Material Thickness on the Ductile Fracture of Steel Plates for Shipbuilding

Kowalski

Kozak

2022

Polish Maritime Research

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Mechanical characterization of hydrogen embrittlement in a gaseous environment: An innovative test setup using sub-size specimens

Madi,

Santana,

Belkacemi

et al. 2024

Engineering Failure Analysis

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Explainable machine learning for precise fatigue crack tip detection

Melching

Strohmann

Requena

et al. 2022

Sci Rep

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Data-driven models based on deep learning have led to tremendous breakthroughs in classical computer vision tasks and have recently made their way into natural sciences. However, the absence of domain knowledge in their inherent design significantly hinders the understanding and acceptance of these models. Nevertheless, explainability is crucial to justify the use of deep learning tools in safety-relevant applications such as aircraft component design, service and inspection. In this work, we train convolutional neural networks for crack tip detection in fatigue crack growth experiments using full-field displacement data obtained by digital image correlation. For this, we introduce the novel architecture ParallelNets—a network which combines segmentation and regression of the crack tip coordinates—and compare it with a classical U-Net-based architecture. Aiming for explainability, we use the Grad-CAM interpretability method to visualize the neural attention of several models. Attention heatmaps show that ParallelNets is able to focus on physically relevant areas like the crack tip field, which explains its superior performance in terms of accuracy, robustness, and stability.

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A CTOD equation based on the rigid rotational factor with the consideration of crack tip blunting due to strain hardening for SEN(B)

Cited by 4 publications

References 21 publications

Influence of Material Thickness on the Ductile Fracture of Steel Plates for Shipbuilding

Influence of Material Thickness on the Ductile Fracture of Steel Plates for Shipbuilding

Mechanical characterization of hydrogen embrittlement in a gaseous environment: An innovative test setup using sub-size specimens

Explainable machine learning for precise fatigue crack tip detection

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