Guy Gendron - Academia.edu (original) (raw)

Papers by Guy Gendron

Research paper thumbnail of Finite element modeling of bolted connections

Canadian Journal of Civil Engineering, 1989

Research paper thumbnail of A {1,2}-order plate theory accounting for three-dimensional thermoelastic deformations in thick composite and sandwich laminates

Composite Structures, 2001

Research paper thumbnail of Mechanics of Damage and Degradation in Random Short Glass Fiber Reinforced Composites

Journal of Thermoplastic Composite Materials, 2002

ABSTRACT The present study is part of an ongoing research work on damage of random short fiber re... more ABSTRACT The present study is part of an ongoing research work on damage of random short fiber reinforced composites. First, the tensile behavior of the material was studied. In its initial state, the material is planarly isotropic elastic. As the load increases, damage induces an anisotropic degradation of the material properties. Then, the degradation mechanisms were studied from microscopic observations of polished specimens. Finally, a theoretical model based on damage mechanics is proposed to predict the mechanical behavior of the material. Damage variables are used to evaluate the change of the compliance tensor. The evolution laws of the damage variables are established within a thermodynamic framework using the associated thermodynamic forces. Correlation with the tensile test results is good. However, additional experiments have to be carried out to fully validate the proposed model.

Research paper thumbnail of Bearing Behavior of Mechanically Fastened Joints in Composite Laminates--Part II: Failure Mechanisms

Mechanics of Advanced Materials and Structures, 2003

The bearing response and failure mechanisms of mechanically fastened carbon/epoxy laminated compo... more The bearing response and failure mechanisms of mechanically fastened carbon/epoxy laminated composite joints were investigated. Some results of the experimental study on strength and local strains were presented in Part I. The investigation on failure mechanisms is summarized in this paper. The major focus of the second part of the experiments was to determine the effect of the stacking sequence and the influence of clamping pressure exerted by a bolt on the bearing failure mechanisms. External damage was examined on a macroscopic scale and internal damage was evaluated using optical microscopy. To evaluate the extent of internal damage, polished cross-sections of the specimens were taken from a bearing plane and from a shear plane tangent to the hole boundary. Fiber orientation has an influence on the location around the hole circumference where failure initiates. Micrographs of the cross-ply and quasi-isotropic laminate specimens showed the importance of the 0° ply behavior. Intensive shear delamination appeared between the 0° ply and the adjacent inner ply. The pattern of bearing damage under the washers is similar for different clamping methods, but the ability of the joint to sustain damage increases with the level of clamping pressure.

Research paper thumbnail of Active shape control of composite structures under thermal loading

Smart Materials & Structures, 2009

Research paper thumbnail of Analysis of bolted joints in composite laminates: Strains and bearing stiffness predictions

Composite Structures, 2007

Research paper thumbnail of Stress and failure analysis of mechanically fastened joints in composite laminates

Composite Structures, 2000

Research paper thumbnail of léments de génie parasismique et de calcul dynamique des structure

Canadian Journal of Civil Engineering, 1997

Research paper thumbnail of A theoretical study on shear strengthening of reinforced concrete beams using composite plates

Composite Structures, 1999

The present paper deals with shear strengthening of reinforced concrete beams by means of thin fi... more The present paper deals with shear strengthening of reinforced concrete beams by means of thin fiber-reinforced composite plates. First, the theoretical model is presented. It is then applied to the shear strengthening of a T-beam. This beam is also used to investigate the ...

Research paper thumbnail of A numerical study of the hygro-mechanical deformation of two cardboard layups

Composites Science and Technology, 2004

A finite element and a semi-analytical model have been set up to study the hygro-mechanical defor... more A finite element and a semi-analytical model have been set up to study the hygro-mechanical deformation of two different three-layer square cardboard sheets. Both models are based on a linear constitutive equation and nonlinear von Karman strain–displacement relationships. Results corresponding to steady-state deformations reached after a moisture content change of 5% are presented. Both models agree on the final deformation

Research paper thumbnail of Bearing Behavior of Mechanically Fastened Joints in Composite Laminates--Part I: Strength and Local Strains

Mechanics of Advanced Materials and Structures, 2003

The bearing response and failure mechanisms of mechanically fastened carbon/epoxy laminated compo... more The bearing response and failure mechanisms of mechanically fastened carbon/epoxy laminated composite joints were investigated. The results of this experimental study will be presented in two papers. In this first paper, results on bearing strength and local strains are reported. In the second paper, failure mechanisms will be described. The major focus of the experiments was to determine the effect

Research paper thumbnail of Minimizing hot spot temperature of porous stackings in natural convection

International Journal of Heat and Mass Transfer, 2008

Due to their large surface of heat transfer per volume, porous structures such as metallic foams ... more Due to their large surface of heat transfer per volume, porous structures such as metallic foams are considered as an interesting alternative to fins. In this paper, we investigate the optimal configuration of a porous medium structure with the objective to minimize the hot spot temperature in natural convection. The heat sink is adjacent to a heat-generating plate, and consists of a stacking of porous layers, in which a cooling fluid circulates strictly driven by natural convection. The objective of this work is to minimize the hot spot temperature of the system. The design variables are the porosity and the material of each layer. The thermal performance is evaluated with a CFD code based on a finite volume approach. The hot spot temperature minimization is pursued with a genetic algorithm (GA) under global mass and cost constraints. The GA determines the optimal porosity and selects the most appropriate material of each layer. Furthermore, the optimal total length of the stacking is indirectly determined by the GA as layers can be added or removed in order to improve the global performance and/or satisfy the constraints. A mapping of the designs generated by the GA as a function of the mass and cost constraint combination reveals that an appropriate distribution of porosity and material benefits the overall thermal performance of the layered porous medium.

Research paper thumbnail of Finite element modeling of bolted connections

Canadian Journal of Civil Engineering, 1989

Research paper thumbnail of A {1,2}-order plate theory accounting for three-dimensional thermoelastic deformations in thick composite and sandwich laminates

Composite Structures, 2001

Research paper thumbnail of Mechanics of Damage and Degradation in Random Short Glass Fiber Reinforced Composites

Journal of Thermoplastic Composite Materials, 2002

ABSTRACT The present study is part of an ongoing research work on damage of random short fiber re... more ABSTRACT The present study is part of an ongoing research work on damage of random short fiber reinforced composites. First, the tensile behavior of the material was studied. In its initial state, the material is planarly isotropic elastic. As the load increases, damage induces an anisotropic degradation of the material properties. Then, the degradation mechanisms were studied from microscopic observations of polished specimens. Finally, a theoretical model based on damage mechanics is proposed to predict the mechanical behavior of the material. Damage variables are used to evaluate the change of the compliance tensor. The evolution laws of the damage variables are established within a thermodynamic framework using the associated thermodynamic forces. Correlation with the tensile test results is good. However, additional experiments have to be carried out to fully validate the proposed model.

Research paper thumbnail of Bearing Behavior of Mechanically Fastened Joints in Composite Laminates--Part II: Failure Mechanisms

Mechanics of Advanced Materials and Structures, 2003

The bearing response and failure mechanisms of mechanically fastened carbon/epoxy laminated compo... more The bearing response and failure mechanisms of mechanically fastened carbon/epoxy laminated composite joints were investigated. Some results of the experimental study on strength and local strains were presented in Part I. The investigation on failure mechanisms is summarized in this paper. The major focus of the second part of the experiments was to determine the effect of the stacking sequence and the influence of clamping pressure exerted by a bolt on the bearing failure mechanisms. External damage was examined on a macroscopic scale and internal damage was evaluated using optical microscopy. To evaluate the extent of internal damage, polished cross-sections of the specimens were taken from a bearing plane and from a shear plane tangent to the hole boundary. Fiber orientation has an influence on the location around the hole circumference where failure initiates. Micrographs of the cross-ply and quasi-isotropic laminate specimens showed the importance of the 0° ply behavior. Intensive shear delamination appeared between the 0° ply and the adjacent inner ply. The pattern of bearing damage under the washers is similar for different clamping methods, but the ability of the joint to sustain damage increases with the level of clamping pressure.

Research paper thumbnail of Active shape control of composite structures under thermal loading

Smart Materials & Structures, 2009

Research paper thumbnail of Analysis of bolted joints in composite laminates: Strains and bearing stiffness predictions

Composite Structures, 2007

Research paper thumbnail of Stress and failure analysis of mechanically fastened joints in composite laminates

Composite Structures, 2000

Research paper thumbnail of léments de génie parasismique et de calcul dynamique des structure

Canadian Journal of Civil Engineering, 1997

Research paper thumbnail of A theoretical study on shear strengthening of reinforced concrete beams using composite plates

Composite Structures, 1999

The present paper deals with shear strengthening of reinforced concrete beams by means of thin fi... more The present paper deals with shear strengthening of reinforced concrete beams by means of thin fiber-reinforced composite plates. First, the theoretical model is presented. It is then applied to the shear strengthening of a T-beam. This beam is also used to investigate the ...

Research paper thumbnail of A numerical study of the hygro-mechanical deformation of two cardboard layups

Composites Science and Technology, 2004

A finite element and a semi-analytical model have been set up to study the hygro-mechanical defor... more A finite element and a semi-analytical model have been set up to study the hygro-mechanical deformation of two different three-layer square cardboard sheets. Both models are based on a linear constitutive equation and nonlinear von Karman strain–displacement relationships. Results corresponding to steady-state deformations reached after a moisture content change of 5% are presented. Both models agree on the final deformation

Research paper thumbnail of Bearing Behavior of Mechanically Fastened Joints in Composite Laminates--Part I: Strength and Local Strains

Mechanics of Advanced Materials and Structures, 2003

The bearing response and failure mechanisms of mechanically fastened carbon/epoxy laminated compo... more The bearing response and failure mechanisms of mechanically fastened carbon/epoxy laminated composite joints were investigated. The results of this experimental study will be presented in two papers. In this first paper, results on bearing strength and local strains are reported. In the second paper, failure mechanisms will be described. The major focus of the experiments was to determine the effect

Research paper thumbnail of Minimizing hot spot temperature of porous stackings in natural convection

International Journal of Heat and Mass Transfer, 2008

Due to their large surface of heat transfer per volume, porous structures such as metallic foams ... more Due to their large surface of heat transfer per volume, porous structures such as metallic foams are considered as an interesting alternative to fins. In this paper, we investigate the optimal configuration of a porous medium structure with the objective to minimize the hot spot temperature in natural convection. The heat sink is adjacent to a heat-generating plate, and consists of a stacking of porous layers, in which a cooling fluid circulates strictly driven by natural convection. The objective of this work is to minimize the hot spot temperature of the system. The design variables are the porosity and the material of each layer. The thermal performance is evaluated with a CFD code based on a finite volume approach. The hot spot temperature minimization is pursued with a genetic algorithm (GA) under global mass and cost constraints. The GA determines the optimal porosity and selects the most appropriate material of each layer. Furthermore, the optimal total length of the stacking is indirectly determined by the GA as layers can be added or removed in order to improve the global performance and/or satisfy the constraints. A mapping of the designs generated by the GA as a function of the mass and cost constraint combination reveals that an appropriate distribution of porosity and material benefits the overall thermal performance of the layered porous medium.