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Title: Progress in Developing Finite Element Models Replicating Flexural Graphite Testing

Abstract

This report documents the status of flexural strength evaluations from current ASTM procedures and of developing finite element models predicting the probability of failure. This work is covered under QLD REC-00030. Flexural testing procedures of the American Society for Testing and Materials (ASTM) assume a linear elastic material that has the same moduli for tension and compression. Contrary to this assumption, graphite is known to have different moduli for tension and compression. A finite element model was developed and demonstrated that accounts for the difference in moduli tension and compression. Brittle materials such as graphite exhibit significant scatter in tensile strength, so probabilistic design approaches must be used when designing components fabricated from brittle materials. ASTM procedures predicting probability of failure in ceramics were compared to methods from the current version of the ASME graphite core components rules predicting probability of failure. Using the ASTM procedures yields failure curves at lower applied forces than the ASME rules. A journal paper was published in the Journal of Nuclear Engineering and Design exploring the statistical models of fracture in graphite.

Authors:
Publication Date:
Research Org.:
Idaho National Laboratory (INL)
Sponsoring Org.:
DOE - NE
OSTI Identifier:
989881
Report Number(s):
INL/EXT-10-18882
TRN: US1007242
DOE Contract Number:  
DE-AC07-05ID14517
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; CERAMICS; COMPRESSION; DESIGN; FLEXURAL STRENGTH; FRACTURES; GRAPHITE; NUCLEAR ENGINEERING; PROBABILITY; STATISTICAL MODELS; TENSILE PROPERTIES; TESTING; finite elements; NGNP

Citation Formats

Robert Bratton. Progress in Developing Finite Element Models Replicating Flexural Graphite Testing. United States: N. p., 2010. Web. doi:10.2172/989881.
Robert Bratton. Progress in Developing Finite Element Models Replicating Flexural Graphite Testing. United States. doi:10.2172/989881.
Robert Bratton. Tue . "Progress in Developing Finite Element Models Replicating Flexural Graphite Testing". United States. doi:10.2172/989881. https://www.osti.gov/servlets/purl/989881.
@article{osti_989881,
title = {Progress in Developing Finite Element Models Replicating Flexural Graphite Testing},
author = {Robert Bratton},
abstractNote = {This report documents the status of flexural strength evaluations from current ASTM procedures and of developing finite element models predicting the probability of failure. This work is covered under QLD REC-00030. Flexural testing procedures of the American Society for Testing and Materials (ASTM) assume a linear elastic material that has the same moduli for tension and compression. Contrary to this assumption, graphite is known to have different moduli for tension and compression. A finite element model was developed and demonstrated that accounts for the difference in moduli tension and compression. Brittle materials such as graphite exhibit significant scatter in tensile strength, so probabilistic design approaches must be used when designing components fabricated from brittle materials. ASTM procedures predicting probability of failure in ceramics were compared to methods from the current version of the ASME graphite core components rules predicting probability of failure. Using the ASTM procedures yields failure curves at lower applied forces than the ASME rules. A journal paper was published in the Journal of Nuclear Engineering and Design exploring the statistical models of fracture in graphite.},
doi = {10.2172/989881},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2010},
month = {6}
}

Technical Report:

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