AMPP Store - Products tagged with 'fracture mechanics'

Available for download

51316-7139-Metallurgical Methods used to Assess the Significance of Pipeline Stress Cracking

Product Number: 51316-7139-SG

ISBN: 7139 2016 CP

Author: Steve Biagiotti

Publication Date: 2016

$20.00

Methods used to destructively determine the actual crack depths in the Pipeline Research Council International project as well as the statistical comparison of those values to the NDE measurements. We also briefly introduce advanced fracture mechanics analysis techniques that can be used to assess the safety significance of crack-like pipeline anomalies.

Available for download

A Fracture Mechanics Approach To Characterizing Hydrogen Embrittlement Of Fasteners

Product Number: 51321-16798-SG

Author: Herman E. Amaya, Behrang Fahimi, Ramgopal Thodla

Publication Date: 2021

$20.00

Materials properties that are used in specific oil and gas environments are de-rated due to the risks associated with hydrogen embrittlement cracking. In oil production environments the concern is for the onset of stress corrosion cracking (SCC), while in seawater environments the concern is for Hydrogen Induced Stress Cracking (HISC). Both are hydrogen embrittlement phenomena with the distinction being the source of hydrogen for each. In SSC the source of hydrogen is from the presence of H2S in the oil production fluids, and in HISC the source of hydrogen is from the dissociation of water from the cathodic protection system. This paper is focused on the latter phenomena and aims to characterize the susceptibility of carbon alloy steels as applied in fastener applications, in a seawater environment under cathodic protection.

Available for download

Development of a Master Curve to Characterize the Susceptibility of Fastener Materials to Hydrogen Embrittlement

Product Number: 51324-20813-SG

Author: Ted L Anderson; Behrang Fahmi; Herman E. Amaya

Publication Date: 2024

$40.00

This paper introduces an innovative approach for mitigating hydrogen embrittlement in materials used in underwater environments, a critical challenge in marine engineering. Our study focuses on developing a comprehensive 'master curve' that encapsulates the complex interplay among key factors: hydrogen concentration, applied potential, and material strength. This curve serves as a predictive tool for evaluating the susceptibility of materials to hydrogen embrittlement, a phenomenon that lacks a one-size-fits-all solution. Through fracture mechanics testing of carbon steel alloys and rigorous analysis, quantitative relationships between these factors are established. This research not only aids in optimizing material selection and designing effective cathodic protection systems but also ensures enhanced safety and integrity in operational contexts. The master curve, rooted in both empirical data and theoretical insights, offers a strategic framework for engineers and industry professionals, guiding decisions that enhance the durability and reliability of subsea equipment.

Available for download

Evaluating The Flaw Tolerance And Ductile Tearing Resistance Of Austenitic Stainless-Steel Welds

Product Number: 51321-16811-SG

Author: Phillip E. Prueter, P.E.; Nathaniel G. Sutton; Paul J. Kowalski

Publication Date: 2021

$20.00

Available for download

Using a Computational Galvanic Model in a Fracture Mechanics Framework to Improve Material Degradation Prediction

Product Number: 51320-14646-SG

Author: Robert Adey, Andres Peratta, John Baynham, Thomas Curtin

Publication Date: 2020

$20.00

Although computational methods have been separately developed to predict corrosion and fatigue crack growth rates for metallic structures, challenges remain in implementing a methodology that considers the combined effects. In this work the output from a galvanic model is used to determine the spatial distribution of corrosion damage; providing a guide for the location of discrete corrosion damage features that can be analyzed using stress fields from structural models. In order to build confidence in this approach the galvanic models are validated by comparing predicted results to surface damage measurements from test specimens subject to ambient atmospheric exposure. There was good comparison between the predicted spatial distribution of corrosion damage and the measured surface damage profiles obtained from the galvanic test specimens. Following this exercise novel computational corrosion damage features were developed to represent simplified cracks shapes emanating from corrosion pits. Stress intensity factors (SIF) for these newly developed hybrid pit-crack features were determined and these solutions compared to cases where the pit is assumed to be an equivalent crack. The impact of the local, cavity induced stress field, on the SIF solutions is discussed. Building on these findings a fatigue crack growth simulation was performed using an initial flaw emanating from a hemispherical cavity (corrosion pit) located at the edge of hole in a plate. A reasonable comparison, of the predicted number of crack growth cycles, to available experimental test results was achieved.

Available for download

Using a Computational Galvanic Model in a Fracture Mechanics Framework to Improve Material Degradation Prediction

Product Number: 51321-16509-SG

Author: Robert Adey/ Andres Peratta/ John Baynham/ Thomas Curtin

Publication Date: 2021

$20.00

Products tagged with 'fracture mechanics'

51316-7139-Metallurgical Methods used to Assess the Significance of Pipeline Stress Cracking

A Fracture Mechanics Approach To Characterizing Hydrogen Embrittlement Of Fasteners

Development of a Master Curve to Characterize the Susceptibility of Fastener Materials to Hydrogen Embrittlement

Evaluating The Flaw Tolerance And Ductile Tearing Resistance Of Austenitic Stainless-Steel Welds

Using a Computational Galvanic Model in a Fracture Mechanics Framework to Improve Material Degradation Prediction

Using a Computational Galvanic Model in a Fracture Mechanics Framework to Improve Material Degradation Prediction

Association for Materials Protection and Performance