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Spricklast för dragbelastat trä med sektionsändring

Kinsella, David LU and Gottsäter, Erik LU (2014) In TVSM VSM820 20141
Structural Mechanics
Abstract
On occasion, structural wooden members in tension feature a sectional
alteration in the form of a notch. In spite of being a highly inhomogeneous
and anisotropic material, as an approximation wood may be modelled
as homogeneous and orthotropic. By means of such a material model,
first order linear elastic theory and a fracture mechanics condition on
the strain energy release rate, a formula is derived for the load bearing
capacity with respect to fracturing. The capacity is further simulated
in 2D with FEM both by employing a linear elastic method with node
releasing and by a non-linear method with a cohesive zone. The validity
of the analytical and numerical models are verified by laboratory tests
comprising 21 small wooden... (More)
On occasion, structural wooden members in tension feature a sectional
alteration in the form of a notch. In spite of being a highly inhomogeneous
and anisotropic material, as an approximation wood may be modelled
as homogeneous and orthotropic. By means of such a material model,
first order linear elastic theory and a fracture mechanics condition on
the strain energy release rate, a formula is derived for the load bearing
capacity with respect to fracturing. The capacity is further simulated
in 2D with FEM both by employing a linear elastic method with node
releasing and by a non-linear method with a cohesive zone. The validity
of the analytical and numerical models are verified by laboratory tests
comprising 21 small wooden members with varying notch size. The
characteristic value of the capacity is determined by the 5th percentile
with 75 % confidence level. The results show that the formula is successful
in predicting the load bearing capacity of the wooden members which
were tested. However, the size effect has yet to be established. (Less)
Please use this url to cite or link to this publication:
author
Kinsella, David LU and Gottsäter, Erik LU
supervisor
organization
alternative title
Fracture load of a wooden tensile member with a notch
course
VSM820 20141
year
type
H3 - Professional qualifications (4 Years - )
subject
keywords
sektionsändring, urtag, trä, brottmekanik, noduppsläppning, kohesiv zon, verifiering genom provning
publication/series
TVSM
report number
TVSM-5191
ISSN
0281-6679
language
Swedish
id
4449528
alternative location
http://www.byggmek.lth.se/
date added to LUP
2014-10-24 13:54:49
date last changed
2014-10-24 13:54:49
@misc{4449528,
  abstract     = {On occasion, structural wooden members in tension feature a sectional
alteration in the form of a notch. In spite of being a highly inhomogeneous
and anisotropic material, as an approximation wood may be modelled
as homogeneous and orthotropic. By means of such a material model,
first order linear elastic theory and a fracture mechanics condition on
the strain energy release rate, a formula is derived for the load bearing
capacity with respect to fracturing. The capacity is further simulated
in 2D with FEM both by employing a linear elastic method with node
releasing and by a non-linear method with a cohesive zone. The validity
of the analytical and numerical models are verified by laboratory tests
comprising 21 small wooden members with varying notch size. The
characteristic value of the capacity is determined by the 5th percentile
with 75 % confidence level. The results show that the formula is successful
in predicting the load bearing capacity of the wooden members which
were tested. However, the size effect has yet to be established.},
  author       = {Kinsella, David and Gottsäter, Erik},
  issn         = {0281-6679},
  keyword      = {sektionsändring,urtag,trä,brottmekanik,noduppsläppning,kohesiv zon,verifiering genom provning},
  language     = {swe},
  note         = {Student Paper},
  series       = {TVSM},
  title        = {Spricklast för dragbelastat trä med sektionsändring},
  year         = {2014},
}