Effect of testing method type and specimen size on mode I fracture toughness of Kimachi sandstone

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68145535%3A_____%2F19%3A00509117" target="_blank" >RIV/68145535:_____/19:00509117 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.jstage.jst.go.jp/article/journalofmmij/135/5/135_33/_article/-char/en" target="_blank" >https://www.jstage.jst.go.jp/article/journalofmmij/135/5/135_33/_article/-char/en</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.2473/journalofmmij.135.33" target="_blank" >10.2473/journalofmmij.135.33</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Effect of testing method type and specimen size on mode I fracture toughness of Kimachi sandstone

Popis výsledku v původním jazyce

Several testing methods have been proposed for evaluating the mode I fracture toughness of rocks. Since the fracture toughness evaluated from the different testing methods is generally not compared, what is still not wellknown is the effect of the testing method type on the fracture toughness. The effect of not only the testing method type but also the specimen size exists in the fracture toughness of rock materials. To clarify the effect of the testing method type and specimen size on the fracture toughness, many fracture toughness tests were performed in thenprevious experimental studies. However, the effect has not been elucidated because the number of the specimens is limited and the range of the specimen size is relatively small in the previous works. In this paper, firstly, three types of the fracture toughness test, the chevron bend (CB) test, semi-circular bend (SCB) test and straight notched disk bending (SNDB) test, were performed using Kimachi sandstone. Then, the SCB test was carried out using the same sandstone with various specimen sizes. As a result, the fracture toughness obtained from the CB and SCB tests were compatible each other. However, the SNDB tests estimated lower value of the fracture toughness than the others. From the results of the SCB tests with various specimen sizes, the fracture toughness increased with increasing radius. Based on the results, the effect of the specimen size on the fracture toughness and the differencesnof the fracture toughness obtained from the three testing methods were discussed.

Název v anglickém jazyce

Effect of testing method type and specimen size on mode I fracture toughness of Kimachi sandstone

Popis výsledku anglicky

Several testing methods have been proposed for evaluating the mode I fracture toughness of rocks. Since the fracture toughness evaluated from the different testing methods is generally not compared, what is still not wellknown is the effect of the testing method type on the fracture toughness. The effect of not only the testing method type but also the specimen size exists in the fracture toughness of rock materials. To clarify the effect of the testing method type and specimen size on the fracture toughness, many fracture toughness tests were performed in thenprevious experimental studies. However, the effect has not been elucidated because the number of the specimens is limited and the range of the specimen size is relatively small in the previous works. In this paper, firstly, three types of the fracture toughness test, the chevron bend (CB) test, semi-circular bend (SCB) test and straight notched disk bending (SNDB) test, were performed using Kimachi sandstone. Then, the SCB test was carried out using the same sandstone with various specimen sizes. As a result, the fracture toughness obtained from the CB and SCB tests were compatible each other. However, the SNDB tests estimated lower value of the fracture toughness than the others. From the results of the SCB tests with various specimen sizes, the fracture toughness increased with increasing radius. Based on the results, the effect of the specimen size on the fracture toughness and the differencesnof the fracture toughness obtained from the three testing methods were discussed.

Druh

J_ost - Ostatní články v recenzovaných periodicích

CEP obor

—

OECD FORD obor

20701 - Environmental and geological engineering, geotechnics

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Journal of the Mining and Materials Processing Institute of Japan

ISSN

1881-6118

e-ISSN

—

Svazek periodika

135

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

JP - Japonsko

Počet stran výsledku

9

Strana od-do

33-41

Kód UT WoS článku

—

EID výsledku v databázi Scopus

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