Nonceramic insulators (NCis) with crimped metal
end fittings were studied to understand the nature of the interfacial
stresses at the rod-metal fitting interface. The study involved
both experimental and computational aspects. Monotonic tension
tests were performed on rod assemblies (bare rod with end fittings
crimped) as well as full-scale composite insulators. Different
rod formulations (E-glass, E-CR glass fibers, resins made of epoxy,
polyester, and vinyl ester) were evaluated. The experimental results
were used to calculate the stresses at the interface. It is shown
that the onset of debonding/detachment of the rod from the end
fitting c…(more)
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%0 Journal Article
%1 mobasher2003mechanical
%A Mobasher, B.
%A Kingsbury, D.
%A Montesinos, J.
%A Gorur, R. S.
%D 2003
%J IEEE TRANSACTIONS ON POWER DELIVERY
%K Brittle cracking crimping debonding deformation delamination elastic fracture plastic
%N 3
%P 852-858
%T Mechanical Aspects of Crimped Glass Reinforced
Plastic (GRP) Rods
%V 18
%X Nonceramic insulators (NCis) with crimped metal
end fittings were studied to understand the nature of the interfacial
stresses at the rod-metal fitting interface. The study involved
both experimental and computational aspects. Monotonic tension
tests were performed on rod assemblies (bare rod with end fittings
crimped) as well as full-scale composite insulators. Different
rod formulations (E-glass, E-CR glass fibers, resins made of epoxy,
polyester, and vinyl ester) were evaluated. The experimental results
were used to calculate the stresses at the interface. It is shown
that the onset of debonding/detachment of the rod from the end
fitting can occur at load magnitude close to the proof-test load. Radial
cracks in the rod can also develop in the crimped portion of
the rod. A theoretical model for pullout was developed to validate
the experimental observations. A companion paper identified the
role played by imperfections in the GRP rod matrix and electrical
stress on brittle fracture. It is concluded that imperfections caused
by crimping, together with mechanical stress concentrations are
a greater threat to brittle fracture than posed by imperfections in
the GRP rod matrix and electric stress concentrations near the line
end fitting, only if the housing does not protect the rod from the elements.
This highlights the importance of good quality control in
manufacturing, and complete protection of the rod by the polymer
housing.
@article{mobasher2003mechanical,
abstract = {Nonceramic insulators (NCis) with crimped metal
end fittings were studied to understand the nature of the interfacial
stresses at the rod-metal fitting interface. The study involved
both experimental and computational aspects. Monotonic tension
tests were performed on rod assemblies (bare rod with end fittings
crimped) as well as full-scale composite insulators. Different
rod formulations (E-glass, E-CR glass fibers, resins made of epoxy,
polyester, and vinyl ester) were evaluated. The experimental results
were used to calculate the stresses at the interface. It is shown
that the onset of debonding/detachment of the rod from the end
fitting can occur at load magnitude close to the proof-test load. Radial
cracks in the rod can also develop in the crimped portion of
the rod. A theoretical model for pullout was developed to validate
the experimental observations. A companion paper identified the
role played by imperfections in the GRP rod matrix and electrical
stress on brittle fracture. It is concluded that imperfections caused
by crimping, together with mechanical stress concentrations are
a greater threat to brittle fracture than posed by imperfections in
the GRP rod matrix and electric stress concentrations near the line
end fitting, only if the housing does not protect the rod from the elements.
This highlights the importance of good quality control in
manufacturing, and complete protection of the rod by the polymer
housing.},
added-at = {2021-03-04T23:35:15.000+0100},
author = {Mobasher, B. and Kingsbury, D. and Montesinos, J. and Gorur, R. S.},
biburl = {https://www.bibsonomy.org/bibtex/2e1ac3f7e37c3688ceb7e48380c16802c/ceps},
interhash = {fdeea48999bedcf04e36e6712b818ee2},
intrahash = {e1ac3f7e37c3688ceb7e48380c16802c},
journal = {IEEE TRANSACTIONS ON POWER DELIVERY},
keywords = {Brittle cracking crimping debonding deformation delamination elastic fracture plastic},
number = 3,
pages = {852-858},
timestamp = {2023-12-20T14:32:37.000+0100},
title = {Mechanical Aspects of Crimped Glass Reinforced
Plastic (GRP) Rods},
volume = 18,
year = 2003
}