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Experimental Testing of Glued Laminated Timber Members using Ultrasonic and Stress Wave Techniques

https://research.thinkwood.com/en/permalink/catalogue151
Year of Publication
2015
Topic
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Author
Nowak, Tomasz
Hamrol-Bielecka, Katarzyna
Jasienko, Jerzy
Organization
Structural Health Assessment of Timber Structures
Year of Publication
2015
Format
Conference Paper
Material
Glulam (Glue-Laminated Timber)
Topic
Mechanical Properties
Keywords
Non-Destructive
Physical Properties
Spruce
Stress
Ultrasonic
Wave Propagation
Wave Techniques
Conference
Structural Health Assessment of Timber Structures 15
Research Status
Complete
Notes
September 9-11, 2015, Wroclaw, Poland
Summary
The paper presents the application of ultrasonic and stress wave techniques in testing the physical and mechanical properties of timber. One of the non-destructive methods for testing timber in construction involves measuring the velocity of ultrasonic and stress wave propagation. The research was carried out using a portable Sylvatest Trio device, which uses ultrasonic technology and a Fakopp Microsecond Timer device, which employs the stress wave technique. The devices measure the wave transition time along a given length of the material, providing qualitative (the extent of possible degradation, structural discontinuities etc.) and quantitative results (density, strength, modulus of elasticity) relating to the state of the timber under study. The paper reports on research on the correlation between wood properties and parameters of ultrasonic and stress wave propagation. The study focused on glued laminated spruce wood of strength class GL24h. Testing involved application of two methods of setting up transducers: directly where the device heads are located on the opposite planes of the test specimens, and where the device heads are located in parallel to or perpendicular to the grain.
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Nondestructive Evaluation of a 75-Year Old Glulam Arch

https://research.thinkwood.com/en/permalink/catalogue246
Year of Publication
2013
Topic
Serviceability
Material
Glulam (Glue-Laminated Timber)
Author
Teder, Marko
Wang, Xiping
Year of Publication
2013
Format
Conference Paper
Material
Glulam (Glue-Laminated Timber)
Topic
Serviceability
Keywords
Decay
Delamination
Modulus of Elasticity
Non-Destructive Evaluation
Stress Wave Timing
Wave Propagation
Strength
Resistance Micro-Drilling
Conference
International Nondestructive Testing and Evaluation of Wood Symposium
Research Status
Complete
Notes
September 24-27, 2013, Madison, Wisconsin, USA
Summary
The purpose of this study was to explore the possibilities of using existing nondestructive evaluation (NDE) methods to assess delamination and decay of glulam structures. A glulam arch removed from a research building after more than 75-year service was used as a test specimen. The glulam arch section was tested using stress wave timing, ultrasonic wave propagation, and resistance microdrilling methods at a series of locations. The arch was subsequently cut open for visual inspection and small compression and shear samples were obtained for strength testing. It was found that wave propagation times or wave velocities measured across the laminations were good indicators of internal decay. Stress wave timing and ultrasonic propagation methods were able to detect moderate to large delamination, but not micro-delamination. Resistance micro-drilling was found not effective in detecting delamination. Further research is planned to evaluate the possibility of using pulse-echo method to detect internal delamination of glulam members. Key words: glued laminated timber (glulam), stress wave, ultrasonic wave, resistance micro-drilling, strength, modulus of elasticity.
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Non-Destructive Testing of Wood–Correlation of Ultrasonic and Stress Wave Test Results in Glued Laminated Timber Members

https://research.thinkwood.com/en/permalink/catalogue1122
Year of Publication
2015
Topic
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Author
Nowak, Tomasz
Hamrol-Bielecka, Katarzyna
Jasienko, Jerzy
Organization
Wroclaw University of Technology
Year of Publication
2015
Format
Journal Article
Material
Glulam (Glue-Laminated Timber)
Topic
Mechanical Properties
Keywords
Non-Destructive Testing
Ultrasonic Waves
Stress Waves
Physical Properties
Spruce
Wave Propagation
Research Status
Complete
Series
Annals of Warsaw University of Life Sciences - SGGW
Summary
Non-destructive testing of wood – correlation of ultrasonic and stress wave test results in glued laminated timber members. The paper presents application of selected non-destructive testing techniques – ultrasonic and stress wave methods - for assessment of the physical and mechanical properties of wood. Nondestructive testing is a scientific field related to: identification of mechanical properties and physical parameters of materials and structural members, detecting material defects and discontinuities, measurement of geometrical dimensions without affecting the functional properties of the elements under investigation. The paper provides a short description of selected methods used for non-destructive and quasi non-destructive testing of wood. It also reports on research on the correlation between glued laminated spruce wood properties and parameters of ultrasonic and stress wave propagation The research was carried out with a Sylvatest Trio device, which uses ultrasonic technology and a Fakopp Microsecond Timer device, which uses the stress wave technique.
Online Access
Free
Resource Link
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