Acoustic Emission: Fracture Detection in Structural Materials

ISBN-13: 9783031112904 / Angielski / Twarda / 2022 / 218 str.

Valentyn Skalskyi;Zinoviy Nazarchuk;Olena Stankevych

Opis

The book presents topical theoretical and experimental studies for developing advanced methods of detecting materials fracture and assessing their structural state using acoustic emission. It introduces new mathematical models characterizing the displacement fields arising from crack-like defects and establishes a new criterion for classifying different types of materials fracture based on specific parameters obtained from wavelet transforms of acoustic emission signals. The book applies this approach to experimental studies in three types of materials-fiber-reinforced composites, dental materials, and hydrogen-embrittled steels.

Spis treści

1 Macrofracture of Structural Materials and Methods

of Determining its Type................................................................................................... 1

1.1      Types of Structural Materials Fracture................................................................ 1

1.2      Application of the Acoustic Emission Method to Detect

the Fracture of Structural Materials...................................................................... 8

1.3      Detection of Defects by Signals

of Magnetoelastic Acoustic Emission ................................................................ 19

1.4      Methods of Spectral Analysis of AE Signals................................................... 21

1.5      Application of Wavelet Transform for

Analysis of AE signals........................................................................................... 31

References............................................................................................................................... 43

2 Mathematical Models for Displacement Fields Caused by

the Crack in an Elastic Half-Space............................................................................ 61

2.1      Basic Relations of Three-Dimensional Dynamic Problems

of the Theory of Elasticity for Bodies with Cracks........................................... 62

2.2      Modeling of Wave Displacements Field on the Half-Space

Surface due to Displacement of the Internal Crack Faces............................... 68

References............................................................................................................................ 102

3 Energy Criterion for Identification of the Types of

Material Macrofracture............................................................................................. 105

3.1      Methods for Identifying the Types of Macrofracture................................... 105

3.2      Construction of the Energy Criterion.............................................................. 108

3.3      Continuous Wavelet Transform of the AE Signals Emitted

under Fracture of Aluminum and its Alloy...................................................... 123

3.4    Specific Features of the Acoustic Emission Signals During Fracture of Aluminum Alloy Welded Joints under

Quasi-Static Loading............................................................................................ 130

3.5      AE-identification of the Types of Fracture during

Low-Temperature Creep Crack Growth........................................................... 135

3.6      Application of the Wavelet Transform to Study the

Features of Non-Metallic Materials Fracture................................................... 140

References............................................................................................................................ 144

vii

4 Evaluation of the Types and Mechanisms of Fracture

of Composite Materials According to Energy Criteria...................................... 151

4.1      Specific Features of Macrofracture of the Glass

Fiber Reinforced Composites............................................................................ 152

4.2      AE-diagnostics of Fracture of the Aramid

Fiber Reinforced Composites............................................................................ 159

References............................................................................................................................ 179

5 Ranking of Dental Materials and Orthopedic Constructions

by their Tendency to Fracture.................................................................................. 185

5.1      State-of-the Art of Researches on Mechanical Properties

of Dental Materials............................................................................................. 186

5.2      Determination of the Characteristics of Materials for Temporary

Fixed Constructions of Dentures...................................................................... 187

5.3      Evaluation of the Types of Dental Polymer Fracture by

the Energy Criterion........................................................................................... 199

5.4      Peculiarities of Some Tooth-Endocrown

Systems Fracture under Quasi-Static Loading............................................... 205

References............................................................................................................................ 220

6 Rating of Hydrogen Damaging of Steels by Wavelet

Transform of Magnetoelastic Acoustic Emission Signals................................. 227

6.1      Some Aspects of Operation the Technical Systems

in Hydrogenous Medium................................................................................... 228

6.2      Method for Estimating the Hydrogen Damage of Structural

Materials by Wavelet Transform of MAE Signals........................................ 232

6.3      Approbation of the Research Technigue on Specimens of

Long-Term Operated Pipe Steels..................................................................... 244

References............................................................................................................................ 255

O autorze

Valentyn Skalskyi was born in Rivne region, Ukraine, on June 25, 1954. He was studied radio engineering at the Lviv Polytechnic Institute (1978). He received the Candidate of Sc. (PhD) and Doctor of Sc. (DSc) Degrees from the Karpenko Physico-Mechanical Institute of the NAS of Ukraine in 1993 and 2003 respectively, both in mechanics of a deformable solid. He holds the State scientific grades of professor (2009) in diagnosis of materials and constructions.

Since 1980, Prof. Skalskyi is with the Karpenko Physico-Mechanical Institute of the National Academy of Sciences (NAS) of Ukraine. He holds the positions of Vice-Director of this Institute since 2015. Also, since March 2015 he is the Member of the NAS of Ukraine.

His research interests include fracture mechanics, technical diagnostic and nondestructive testing and development of systems of digital signal processing. He has over 500 publications (34 books including) in scientific journals and conference proceedings. Currently he is the editorial-board member of the international journal Materials Science.

Prof. Skalskyi is Honored Worker in Science and Engineering of Ukraine, holds the State Prize of Ukraine for Science and Engineering and two NASU Prizes for works for NDT methodology and its application based on acoustic emission.

 

Zinoviy Nazarchuk was born in Lviv, Ukraine, in 1952. He received the Candidate of Sc. (PhD) and Doctor of Sc. Degrees from Kharkiv State University in 1982 and 1990 respectively, both in radio science. He holds the State scientific grades of senior researcher (1988) and professor (1998) in theoretical and mathematical physics.

Since 1976, Prof. Nazarchuk is with the Karpenko Physico-Mechanical Institute of the National Academy of Sciences of Ukraine (NASU). He holds the positions of Vice-Director (1991-2014) and Director (since 2015) of this Institute. Also, since 2007 he is the member of the Presidium of NASU and head of the Western Scientific Center of NASU and Ministry of Education and Science of Ukraine.

Prof. Nazarchuk is Member of NASU (since 2006). He works in the field of material science, theoretical radio physics and mathematical modelling. His principal area of research is the waves theory and applied mathematics. He has more than 370 publications (15 books including) in the field of the theory of material diagnostics, non-destructive testing, and numerical electromagnetics. Currently he is the editor-in-chief of the international journal Materials Science and the periodical interbranch collection of scientific papers Information Extraction and Processing.

Prof. Nazarchuk is Honored Worker in Science and Engineering of Ukraine, holds the State Prize of Ukraine for Science and Engineering and three NASU Prizes for works in the theory of physical fields and for NDT methodology and its application based on acoustic emission.

Olena Stankevych was born in Lviv, Ukraine, in 1970. She was studied applied mathematics at the Lviv Polytechnic Institute (1992). She received the Candidate of Sc. (PhD) and Doctor of Sc. (DSc) Degrees from the Karpenko Physico-Mechanical Institute of the NAS of Ukraine in 2012 and 2019 respectively, both in diagnosis of materials and constructions. He holds the State scientific grades of senior researcher (2016) in diagnosis of materials and constructions.

Since 2010, DSc Stankevych is with the Karpenko Physico-Mechanical Institute of the National Academy of Sciences of Ukraine (NASU). She holds the positions from Junior Researcher (2010) to Leading Researcher (since 2020) of this Institute.

Her research focuses on wave propagation and vibrations in solids with cracks. She is interested in both basic research and applications in nondestructive testing and digital signal processing. She has over 80 publications in scientific journals and conference proceedings.