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Title: Atomistic-scale evaluation of the fracture toughness of silica.

Abstract

Abstract not provided.

Authors:
; ; ;
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Sandia National Laboratories, Livermore, CA
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1367253
Report Number(s):
SAND2017-5271D
653403
DOE Contract Number:
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: Proposed for presentation at the 10th Annual Postdoctoral Technical Showcase held November 8, 2016 in Albuquerque, NM.
Country of Publication:
United States
Language:
English

Citation Formats

Rimsza, Jessica, Jones, Reese E., Criscenti, Louise, and Altman, Susan J. Atomistic-scale evaluation of the fracture toughness of silica.. United States: N. p., 2017. Web.
Rimsza, Jessica, Jones, Reese E., Criscenti, Louise, & Altman, Susan J. Atomistic-scale evaluation of the fracture toughness of silica.. United States.
Rimsza, Jessica, Jones, Reese E., Criscenti, Louise, and Altman, Susan J. 2017. "Atomistic-scale evaluation of the fracture toughness of silica.". United States. doi:. https://www.osti.gov/servlets/purl/1367253.
@article{osti_1367253,
title = {Atomistic-scale evaluation of the fracture toughness of silica.},
author = {Rimsza, Jessica and Jones, Reese E. and Criscenti, Louise and Altman, Susan J.},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2017,
month = 5
}

Conference:
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  • Abstract not provided.
  • A new evaluation procedure has been proposed in this paper to determine the required fracture toughness as a function of the required deformability of structural components. This procedure is characterized by the equivalent CTOD (Crack Tip Opening Displacement) concept which provides the compatible Weibull stress between the 3-point bend specimen and the structural component. The present procedure was useful for the estimation of the fracture performance of notched wide plates from 3-point bend CTOD results, while the analysis based on the conventional CTOD concept gave very conservative estimation. The strength mis-match effect on the required toughness of the weld metalmore » to meet the design requirement can be quantified by the equivalent CTOD concept. It was demonstrated by the numerical simulation using the welded joint of a Grade 550 pipeline steel that the required bend CTOD {delta}{sub 3P}{sup R} was much smaller than the required CTOD {delta}{sub WP}{sup R} for the wide plate. The required weld metal CTOD {delta}{sub WP}{sup R} for the wide plate increased with decreasing the yield strength mis-match ratio {sigma}{sub Y}{sup W}/{sigma}{sub Y}{sup B} between the base and weld metals. By contrast, the required bend CTOD {sigma}{sub 3P}{sup R} of the weld metal was not always sensitive to the mis-match condition in welds.« less
  • One of the greatest uncertainties in a fitness-for-service evaluation is the fracture toughness input for the material of interest. Deterministic analyses with lower-bound estimates of toughness can be overly conservative. An alternative approach is to perform a probabilistic fitness-for-service analysis that considers the statistical distribution of toughness. This article presents a methodology for determining fracture toughness distributions for ferritic steels in the ductile-brittle transition region. A major advantage of this approach is that the toughness distribution for a given material can be inferred from Charpy data.
  • The difference in the degree of plastic constraint in the vicinity of a pre-existing crack brings about difficulty in the evaluation of fracture performance of weldments when using fracture toughness obtained by conventional fracture toughness test results. The constraint controlling factors can be divided into two main areas, geometrical and materials factors. The effect of both factors on the stress/strain behavior in the vicinity of a crack tip is discussed systematically based on previous research and numerical analyses. It is clarified that the common fracture parameters such as J and CTOD do not always represent material constants because of themore » change of stress/strain behavior as a results of the difference in plastic constraint. The possibility of evaluation based on the Local Approach is discussed in order to link between structural integrity assessment and fracture toughness evaluation. 81 refs., 15 figs., 1 tab.« less