Introduction of Welds into the Dynamic Model of Laminated Structures

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OGRINEC, Primož ;ČEPON, Gregor ;BOLTEŽAR, Miha .
Introduction of Welds into the Dynamic Model of Laminated Structures. 
Strojniški vestnik - Journal of Mechanical Engineering, [S.l.], v. 64, n.2, p. 73-81, march 2018. 
ISSN 0039-2480.
Available at: <http://www.sv-jme.eu/article/introducing-welds-into-the-dynamic-model-of-laminated-structures/>. Date accessed: 22 apr. 2018. 
doi:http://dx.doi.org/10.5545/sv-jme.2017.4915.
Ogrinec, P., Čepon, G., & Boltežar, M.
(2018).
Introduction of Welds into the Dynamic Model of Laminated Structures.
Strojniški vestnik - Journal of Mechanical Engineering, 64(2), 73-81.
doi:http://dx.doi.org/10.5545/sv-jme.2017.4915
@article{sv-jmesv-jme.2017.4915,
	author = {Primož  Ogrinec and Gregor  Čepon and Miha  Boltežar},
	title = {Introduction of Welds into the Dynamic Model of Laminated Structures},
	journal = {Strojniški vestnik - Journal of Mechanical Engineering},
	volume = {64},
	number = {2},
	year = {2018},
	keywords = {laminated structure; electric stator package; dynamics; contact model; weld; modal analysis},
	abstract = {Laminated structures, like an electric stator package, exhibit orthotropic behaviour and high levels of internal damping due to the inter-laminar friction forces. Modelling the complex geometry, number of laminae, spatial pressure distribution, and the effects of welds on the dynamic response of laminated structure remains a challenging issue. The presence of welds, that serve as a physical connection between laminae, results in non-uniform pressure distribution between laminae. Usually orthotropic material properties are proposed to account for lower stiffness in the sheet stacking direction. These models assume uniform distribution of friction forces and may even lead to occurrence of additional, unrealistic mode shapes. In this paper the dynamics model of the electric machine stator is proposed that employs a new contact formulation using beam elements, characterized by stiffness and damping parameters in the tangential direction and nonlinear contact stiffness in the normal contact direction. The welds and the welding process itself are represented using spring-thermo elasto-plastic bar model. As the contact model assumes nonuniform pressure distribution it is possible to include the effect of residual stresses that occur after the welding process. The validity of developed numerical model is demonstrated by comparing numerically and experimentally obtained eigenfrequencies and modes for three different stator packets that differ in geometry, position and the number of welds.},
	issn = {0039-2480},	pages = {73-81},	doi = {10.5545/sv-jme.2017.4915},
	url = {http://www.sv-jme.eu/article/introducing-welds-into-the-dynamic-model-of-laminated-structures/}
}
Ogrinec, P.,Čepon, G.,Boltežar, M.
2018 March 64. Introduction of Welds into the Dynamic Model of Laminated Structures. Strojniški vestnik - Journal of Mechanical Engineering. [Online] 64:2
%A Ogrinec, Primož 
%A Čepon, Gregor 
%A Boltežar, Miha 
%D 2018
%T Introduction of Welds into the Dynamic Model of Laminated Structures
%B 2018
%9 laminated structure; electric stator package; dynamics; contact model; weld; modal analysis
%! Introduction of Welds into the Dynamic Model of Laminated Structures
%K laminated structure; electric stator package; dynamics; contact model; weld; modal analysis
%X Laminated structures, like an electric stator package, exhibit orthotropic behaviour and high levels of internal damping due to the inter-laminar friction forces. Modelling the complex geometry, number of laminae, spatial pressure distribution, and the effects of welds on the dynamic response of laminated structure remains a challenging issue. The presence of welds, that serve as a physical connection between laminae, results in non-uniform pressure distribution between laminae. Usually orthotropic material properties are proposed to account for lower stiffness in the sheet stacking direction. These models assume uniform distribution of friction forces and may even lead to occurrence of additional, unrealistic mode shapes. In this paper the dynamics model of the electric machine stator is proposed that employs a new contact formulation using beam elements, characterized by stiffness and damping parameters in the tangential direction and nonlinear contact stiffness in the normal contact direction. The welds and the welding process itself are represented using spring-thermo elasto-plastic bar model. As the contact model assumes nonuniform pressure distribution it is possible to include the effect of residual stresses that occur after the welding process. The validity of developed numerical model is demonstrated by comparing numerically and experimentally obtained eigenfrequencies and modes for three different stator packets that differ in geometry, position and the number of welds.
%U http://www.sv-jme.eu/article/introducing-welds-into-the-dynamic-model-of-laminated-structures/
%0 Journal Article
%R 10.5545/sv-jme.2017.4915
%& 73
%P 9
%J Strojniški vestnik - Journal of Mechanical Engineering
%V 64
%N 2
%@ 0039-2480
%8 2018-03-08
%7 2018-03-08
Ogrinec, Primož, Gregor  Čepon, & Miha  Boltežar.
"Introduction of Welds into the Dynamic Model of Laminated Structures." Strojniški vestnik - Journal of Mechanical Engineering [Online], 64.2 (2018): 73-81. Web.  22 Apr. 2018
TY  - JOUR
AU  - Ogrinec, Primož 
AU  - Čepon, Gregor 
AU  - Boltežar, Miha 
PY  - 2018
TI  - Introduction of Welds into the Dynamic Model of Laminated Structures
JF  - Strojniški vestnik - Journal of Mechanical Engineering
DO  - 10.5545/sv-jme.2017.4915
KW  - laminated structure; electric stator package; dynamics; contact model; weld; modal analysis
N2  - Laminated structures, like an electric stator package, exhibit orthotropic behaviour and high levels of internal damping due to the inter-laminar friction forces. Modelling the complex geometry, number of laminae, spatial pressure distribution, and the effects of welds on the dynamic response of laminated structure remains a challenging issue. The presence of welds, that serve as a physical connection between laminae, results in non-uniform pressure distribution between laminae. Usually orthotropic material properties are proposed to account for lower stiffness in the sheet stacking direction. These models assume uniform distribution of friction forces and may even lead to occurrence of additional, unrealistic mode shapes. In this paper the dynamics model of the electric machine stator is proposed that employs a new contact formulation using beam elements, characterized by stiffness and damping parameters in the tangential direction and nonlinear contact stiffness in the normal contact direction. The welds and the welding process itself are represented using spring-thermo elasto-plastic bar model. As the contact model assumes nonuniform pressure distribution it is possible to include the effect of residual stresses that occur after the welding process. The validity of developed numerical model is demonstrated by comparing numerically and experimentally obtained eigenfrequencies and modes for three different stator packets that differ in geometry, position and the number of welds.
UR  - http://www.sv-jme.eu/article/introducing-welds-into-the-dynamic-model-of-laminated-structures/
@article{{sv-jme}{sv-jme.2017.4915},
	author = {Ogrinec, P., Čepon, G., Boltežar, M.},
	title = {Introduction of Welds into the Dynamic Model of Laminated Structures},
	journal = {Strojniški vestnik - Journal of Mechanical Engineering},
	volume = {64},
	number = {2},
	year = {2018},
	doi = {10.5545/sv-jme.2017.4915},
	url = {http://www.sv-jme.eu/article/introducing-welds-into-the-dynamic-model-of-laminated-structures/}
}
TY  - JOUR
AU  - Ogrinec, Primož 
AU  - Čepon, Gregor 
AU  - Boltežar, Miha 
PY  - 2018/03/08
TI  - Introduction of Welds into the Dynamic Model of Laminated Structures
JF  - Strojniški vestnik - Journal of Mechanical Engineering; Vol 64, No 2 (2018): Strojniški vestnik - Journal of Mechanical Engineering
DO  - 10.5545/sv-jme.2017.4915
KW  - laminated structure, electric stator package, dynamics, contact model, weld, modal analysis
N2  - Laminated structures, like an electric stator package, exhibit orthotropic behaviour and high levels of internal damping due to the inter-laminar friction forces. Modelling the complex geometry, number of laminae, spatial pressure distribution, and the effects of welds on the dynamic response of laminated structure remains a challenging issue. The presence of welds, that serve as a physical connection between laminae, results in non-uniform pressure distribution between laminae. Usually orthotropic material properties are proposed to account for lower stiffness in the sheet stacking direction. These models assume uniform distribution of friction forces and may even lead to occurrence of additional, unrealistic mode shapes. In this paper the dynamics model of the electric machine stator is proposed that employs a new contact formulation using beam elements, characterized by stiffness and damping parameters in the tangential direction and nonlinear contact stiffness in the normal contact direction. The welds and the welding process itself are represented using spring-thermo elasto-plastic bar model. As the contact model assumes nonuniform pressure distribution it is possible to include the effect of residual stresses that occur after the welding process. The validity of developed numerical model is demonstrated by comparing numerically and experimentally obtained eigenfrequencies and modes for three different stator packets that differ in geometry, position and the number of welds.
UR  - http://www.sv-jme.eu/article/introducing-welds-into-the-dynamic-model-of-laminated-structures/
Ogrinec, Primož, Čepon, Gregor, AND Boltežar, Miha.
"Introduction of Welds into the Dynamic Model of Laminated Structures" Strojniški vestnik - Journal of Mechanical Engineering [Online], Volume 64 Number 2 (08 March 2018)

Authors

Affiliations

  • University of Ljubljana, Faculty for Mechanical Engineering, Slovenia
  • University of Ljubljana, Faculty for Mechanical Engineering, Slovenia
  • University of Ljubljana, Faculty for Mechanical Engineering, Slovenia

Paper's information

Strojniški vestnik - Journal of Mechanical Engineering 64(2018)2, 73-81

10.5545/sv-jme.2017.4915

Laminated structures, like an electric stator package, exhibit orthotropic behaviour and high levels of internal damping due to the inter-laminar friction forces. Modelling the complex geometry, number of laminae, spatial pressure distribution, and the effects of welds on the dynamic response of laminated structure remains a challenging issue. The presence of welds, that serve as a physical connection between laminae, results in non-uniform pressure distribution between laminae. Usually orthotropic material properties are proposed to account for lower stiffness in the sheet stacking direction. These models assume uniform distribution of friction forces and may even lead to occurrence of additional, unrealistic mode shapes. In this paper the dynamics model of the electric machine stator is proposed that employs a new contact formulation using beam elements, characterized by stiffness and damping parameters in the tangential direction and nonlinear contact stiffness in the normal contact direction. The welds and the welding process itself are represented using spring-thermo elasto-plastic bar model. As the contact model assumes nonuniform pressure distribution it is possible to include the effect of residual stresses that occur after the welding process. The validity of developed numerical model is demonstrated by comparing numerically and experimentally obtained eigenfrequencies and modes for three different stator packets that differ in geometry, position and the number of welds.

laminated structure; electric stator package; dynamics; contact model; weld; modal analysis