Publication detail

Visualization of the Evolution of the Fracture Process Zone in Sandstone by Transmission Computed Radiography

VAVRO, L. SOUČEK, K. KYTÝŘ, D. FÍLA, T. KERŠNER, Z. VAVRO, M.

Original Title

Visualization of the Evolution of the Fracture Process Zone in Sandstone by Transmission Computed Radiography

Type

conference paper

Language

English

Original Abstract

The article deals with the use of computed X-ray radiography to visualize the development of the fracture process zone in the rock samples. For radiographic observations during the three-point bending loading, glauconitic sandstone from the Řeka quarry (sometimes also referred to as Godula sandstone) was used. The chevron-notched cylindrical specimens with the diameter of 29 mm and 120 mm nominal length were prepared from the sandstone blocks. These specimens were subjected to the Chevron Bend (CB) test carried out in accordance with the ISRM suggested methodology; the span was 94 mm. The evolution of the fracture process zone was continuously scanned using X-ray radiography during the realized Mode I fracture toughness tests (FTT). The scanning was conducted using an industrial X-ray micro-tomographic inspection system equipped with a flat panel X-ray detector of 4,000 × 4,000 pixels and micro-focus X-ray source with reflection target, which are very suitable for obtaining highly detailed radiographic images during the FTT tests. Three-point bending tests were carried out using an in-house designed table-top loading device, construction of which allows precise control of the loading during testing. Continuous X-ray examination and subsequent radiographic image analysis enable investigation of the crack initiation and the process zone development during FTT and represents a useful tool for a better understanding of failure behavior of the rock material during the loading process.

Keywords

Fracture process zone; fracture toughness; Chevron Bend (CB) test; glauconitic sandstone; X-ray radiography

Authors

VAVRO, L.; SOUČEK, K.; KYTÝŘ, D.; FÍLA, T.; KERŠNER, Z.; VAVRO, M.

Released

1. 7. 2017

Publisher

Elsevier

ISBN

1877-7058

Periodical

Procedia Engineering

Year of study

2017

Number

1

State

Kingdom of the Netherlands

Pages from

689

Pages to

696

Pages count

8

URL

https://www.sciencedirect.com/science/article/pii/S1877705817323731

Full text in the Digital Library

http://hdl.handle.net/11012/193248

BibTex

@inproceedings{BUT146060,
  author="Leona {Vavro} and Kamil {Souček} and Daniel {Kytýř} and Tomáš {Fíla} and Zbyněk {Keršner} and Martin {Vavro}",
  title="Visualization of the Evolution of the Fracture Process Zone in Sandstone by Transmission Computed Radiography",
  booktitle="Procedia Engineering: Symposium of the International Society for Rock Mechanics",
  year="2017",
  journal="Procedia Engineering",
  volume="2017",
  number="1",
  pages="689--696",
  publisher="Elsevier",
  doi="10.1016/j.proeng.2017.05.233",
  issn="1877-7058",
  url="https://www.sciencedirect.com/science/article/pii/S1877705817323731"
}