Number of the records: 1

Ultrasonic method for estimation of crack initiation stress

SYSNO ASEP	0481249
Document Type	C - Proceedings Paper (int. conf.)
R&D Document Type	The record was not marked in the RIV
Title	Ultrasonic method for estimation of crack initiation stress
Author(s)	Petružálek, Matěj (GLU-S)_{RID, SAI, ORCID} Lokajíček, Tomáš (GLU-S)_{RID, SAI, ORCID} Svitek, Tomáš (GLU-S)_{SAI, RID}
Source Title	51st US Rock Mechanics/Geomechanics Symposium. - s. l. : American Rock Mechanics Association, 2017 - ISBN N
Number of pages	6 s.
Publication form	Print - P
Action	US Rock Mechanics/Geomechanics Symposium /51./
Event date	25.06.2017 - 28.06.2017
VEvent location	San Francisco
Country	US - United States
Event type	WRD
Language	eng - English
Country	US - United States
Keywords	ultrasonic ; crack initiation stress
Subject RIV	DB - Geology ; Mineralogy
R&D Projects	GA13-13967S GA ČR - Czech Science Foundation (CSF)
	GA16-03950S GA ČR - Czech Science Foundation (CSF)
Annotation	Stress strain behavior of low-porosity crystalline rocks is divided into four characteristic stages: crack closure, elastic region, stable crack growth and unstable crack growth which leads to brittle failure. The beginning of stable crack growth is called the crack initiation stress while the beginning of unstable microcracking is called the crack damage stress. This laboratory study presents a new technique for estimation of crack initiation threshold. The technique is based on the interpretation of measured ultrasonic attenuation. The attenuation method was tested on the set of 4 granite specimens during the uniaxial loading. The attenuation based crack initiation stresses were comparable with those determined by interpretation of stress-strain data and acoustic emission data.
Workplace	Institute of Geology
Contact	Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272
Year of Publishing	2018

Number of the records: 1