All

What are you looking for?

All
Projects
Results
Organizations

Quick search

  • Projects supported by TA ČR
  • Excellent projects
  • Projects with the highest public support
  • Current projects

Smart search

  • That is how I find a specific +word
  • That is how I leave the -word out of the results
  • “That is how I can find the whole phrase”

The Effect of Pile-Up on Indentation Hardness Evaluation of Neutron-Irradiated 15Ch2MFA Steel

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F18%3A00327087" target="_blank" >RIV/68407700:21340/18:00327087 - isvavai.cz</a>

  • Result on the web

    <a href="http://dx.doi.org/10.12693/APhysPolA.134.729" target="_blank" >http://dx.doi.org/10.12693/APhysPolA.134.729</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.12693/APhysPolA.134.729" target="_blank" >10.12693/APhysPolA.134.729</a>

Alternative languages

  • Result language

    angličtina

  • Original language name

    The Effect of Pile-Up on Indentation Hardness Evaluation of Neutron-Irradiated 15Ch2MFA Steel

  • Original language description

    Hardness testing is an efficient means for monitoring the change in mechanical properties of irradiated materials. The evaluation of the indentation load-displacement data is commonly based on the Oliver-Pharr method, which estimates the projected contact area between the indenter tip and the material surface using Sneddon's elastic contact solution. This simplified method can lead to significant errors when the indented elastic-plastic material exhibits extensive pile-up around the indenter, which is typical for a material with a smaller strain-hardening exponent n and a smaller yield strength-to-elastic modulus ratio sigma(y)/E. Since both these mechanical properties are influenced by the neutron irradiation, one must be careful with the interpretation of measured indentation hardness. In this study, a finite element simulation was used to investigate the effect of pile-up on indentation hardness evaluation. Load-displacement curves, contact areas evaluated by both Oliver-Pharr method and finite element nodes in contact and the corresponding hardnesses were obtained for the 15Ch2MFA (15Cr2MoV) tempered bainitic steel in non-irradiated and neutron-irradiated state. The Oliver-Pharr method underestimates the true contact area, and therefore overestimates hardness by factor of 1.32 and 1.40 for non-and neutron-irradiated state, respectively. Despite this discrepancy, the Oliver-Pharr method as well as direct observation of the contact area are able to indicate the increase of hardness due to neutron-irradiation (15% vs. 8% increase in hardness).

  • Czech name

  • Czech description

Classification

  • Type

    J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database

  • CEP classification

  • OECD FORD branch

    20501 - Materials engineering

Result continuities

  • Project

    <a href="/en/project/TH02020565" target="_blank" >TH02020565: Assurance of Safe and Long Term Operation of Nuclear Reactor Pressure Vessel Internals</a><br>

  • Continuities

    P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Others

  • Publication year

    2018

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Acta Physica Polonica A

  • ISSN

    0587-4246

  • e-ISSN

    1898-794X

  • Volume of the periodical

    134

  • Issue of the periodical within the volume

    3

  • Country of publishing house

    PL - POLAND

  • Number of pages

    4

  • Pages from-to

    729-732

  • UT code for WoS article

    000453257500027

  • EID of the result in the Scopus database

    2-s2.0-85058945747