Fracture Analysis of Orthotropic Beams : Linear Elastic and Non-Linear Methods
(2001) In TVSM-3000 200(TVSM-3029).- Abstract
- The use of timber as a construction material demands continuous improvements of our knowledge about the material and computational techniques for structural analysis and design.
In this report the fracture properties of wood are studied and implemented into numerical crack propagation models. The numerical algorithms are utilized for computing the development of cracks in structural elements. Six types of timber beams, with holes and notches, are studied. Experimental results for critical load indicate that the numerical results are fairly accurate. In addition, numerical studies are performed regarding the influence of distribution of load at support, influence of beam geometry, load configuration and axial force. The experimental... (More) - The use of timber as a construction material demands continuous improvements of our knowledge about the material and computational techniques for structural analysis and design.
In this report the fracture properties of wood are studied and implemented into numerical crack propagation models. The numerical algorithms are utilized for computing the development of cracks in structural elements. Six types of timber beams, with holes and notches, are studied. Experimental results for critical load indicate that the numerical results are fairly accurate. In addition, numerical studies are performed regarding the influence of distribution of load at support, influence of beam geometry, load configuration and axial force. The experimental results presented include a comprehensive testing series on the fracture softening properties of wood in pure and combined shear and tension perpendicular to grain.
For end-notched beams, the distribution of load at support affects the load-bearing capacity when the loaded area is close to a corner. The way the load was distributed was found to have little influence on beams of different size, while the notch geometry has a strong influence on the load-bearing capacity. The notch depth and height are the main parameters where the notch height has the most intensive influence. Load configuration does not influence the load-bearing capacity to any greater extent except for external loads placed within a distance of beam height from the notch. In that case the load runs partly straight down to the support without affecting the stress singularity very much at the notch corner. If the supporting force is at an angle to the support area, an axial force may develop in the structure resulting in influence on the load-bearing capacity.
It may be convenient to use simple correction factors to specify in an approximate manner the influence of the studied parameters on the load-bearing capacity of structural elements.
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https://lup.lub.lu.se/record/ae4ca150-f276-4b12-b38b-9ca7c3aec8e3
- author
- Stefansson, Fridberg
- supervisor
- organization
- publishing date
- 2001-11
- type
- Thesis
- publication status
- published
- subject
- keywords
- Fracture mechanics, Wood, Crack, Notches, Holes, Finite Element Method
- in
- TVSM-3000
- volume
- 200
- issue
- TVSM-3029
- pages
- 137 pages
- publisher
- Division of Structural Mechanics, LTH
- ISSN
- 0281-6679
- language
- English
- LU publication?
- no
- id
- ae4ca150-f276-4b12-b38b-9ca7c3aec8e3
- date added to LUP
- 2023-08-14 18:14:44
- date last changed
- 2023-10-16 09:46:09
@misc{ae4ca150-f276-4b12-b38b-9ca7c3aec8e3,
abstract = {{The use of timber as a construction material demands continuous improvements of our knowledge about the material and computational techniques for structural analysis and design.<br/>In this report the fracture properties of wood are studied and implemented into numerical crack propagation models. The numerical algorithms are utilized for computing the development of cracks in structural elements. Six types of timber beams, with holes and notches, are studied. Experimental results for critical load indicate that the numerical results are fairly accurate. In addition, numerical studies are performed regarding the influence of distribution of load at support, influence of beam geometry, load configuration and axial force. The experimental results presented include a comprehensive testing series on the fracture softening properties of wood in pure and combined shear and tension perpendicular to grain.<br/>For end-notched beams, the distribution of load at support affects the load-bearing capacity when the loaded area is close to a corner. The way the load was distributed was found to have little influence on beams of different size, while the notch geometry has a strong influence on the load-bearing capacity. The notch depth and height are the main parameters where the notch height has the most intensive influence. Load configuration does not influence the load-bearing capacity to any greater extent except for external loads placed within a distance of beam height from the notch. In that case the load runs partly straight down to the support without affecting the stress singularity very much at the notch corner. If the supporting force is at an angle to the support area, an axial force may develop in the structure resulting in influence on the load-bearing capacity.<br/>It may be convenient to use simple correction factors to specify in an approximate manner the influence of the studied parameters on the load-bearing capacity of structural elements.<br/><br/>}},
author = {{Stefansson, Fridberg}},
issn = {{0281-6679}},
keywords = {{Fracture mechanics; Wood; Crack; Notches; Holes; Finite Element Method}},
language = {{eng}},
note = {{Licentiate Thesis}},
number = {{TVSM-3029}},
publisher = {{Division of Structural Mechanics, LTH}},
series = {{TVSM-3000}},
title = {{Fracture Analysis of Orthotropic Beams : Linear Elastic and Non-Linear Methods}},
url = {{https://lup.lub.lu.se/search/files/160469772/web3029.pdf}},
volume = {{200}},
year = {{2001}},
}