VERSION OF SHEAR DEFORMATION OF ADHESIVE LAYER CONSIDERING ITS ELASTOPLASTIC PROPERTIES. FINDING THE J-INTEGRAL

2021 ◽  
pp. 65-70
Author(s):  
Viktoriya E. Bogacheva ◽  
Vadim V. Glagolev ◽  
Oksana V. Inchenko
Keyword(s):  
Shear Deformation ◽  
Adhesive Layer ◽  
J Integral ◽  
Elastoplastic Properties

Measurement of Cohesive Laws and Related Problems

2009 ◽  
Author(s):  
Ulf Stigh ◽  
K. Svante Alfredsson ◽  
Anders Biel
Keyword(s):  
Cohesive Zone ◽  
Adhesive Layer ◽  
J Integral ◽  
Material Behaviour ◽  
Cohesive Law ◽  
Simple Method ◽  
Process Region ◽  
Path Independence ◽  
Cohesive Laws ◽  
Separation Relation

Cohesive modelling provides a simple method to introduce a process region in models of fracture. It is computationally attractive since it blends into the structure of finite element programmes for stress analysis. The development of computational methods and applications of cohesive modelling has accelerated during recent years. Methods to measure cohesive laws have also been developed. One class of such methods is based on the path-independence of the J-integral. By choosing a path encircling the cohesive zone, J can be shown to be given by the area under the traction-separation relation for the cohesive zone. Using an alternative path, J can in some cases be directly related to the applied load and deformation with relatively modest or no assumptions on the material behaviour. Thus, the cohesive law can be measured. Methods to measure cohesive laws for different specimen geometries are presented. The methods are used to measure the cohesive law in peel, shear and mixed-mode for an adhesive layer. A new method to measure cohesive laws in shear is presented. The method is shown to give accurate data with a much smaller test specimen than earlier methods.

Deformation Behavior of Adhesive Layer in Stretch-Bending/Unbending for Adhesively Bonded Sheet Metals

2014 ◽  
Vol 939 ◽  
pp. 19-24 ◽  
Author(s):  
Michihiro Takiguchi ◽  
Taro Tokuda ◽  
Tetsuya Yoshida ◽  
Takeshi Uemori ◽  
Fusahito Yoshida
Keyword(s):  
Shear Deformation ◽  
Deformation Behavior ◽  
Adhesive Layer ◽  
Sheet Metals ◽  
Adhesively Bonded ◽  
Plastic Working ◽  
Cyclic Shear ◽  
Adhesive Layers ◽  
Stretch Bending ◽  
Bending Behavior

In this paper, the deformation behavior of adhesive layer in stretch-bending/unbending for adhesively bonded sheet metals was investigated by experiments and finite element method (FEM). We paid special attention to the cyclic shear deformation of the adhesive layers during the plastic working. Major results obtained are summarized as follows: (1) When the adhesively bonded sheet metals is bent and pulled out at a 90° angle, shear deformation due to bending of the adhesive layer starts shortly before reaching the die corner and unbending starts at the middle of the corner. (2) The die radius has a large influence on the bending behavior. (3) It is possible to suppress shear deformation of the adhesive layer by using a material with small tensile strength as one of the two adherends.

Die-Bending of Adhesively Bonded Sheet Metals

2014 ◽  
Vol 626 ◽  
pp. 103-108 ◽  
Author(s):  
Michihiro Takiguchi ◽  
Taro Tokuda ◽  
Tetsuya Yoshida ◽  
Takeshi Uemori ◽  
Fusahito Yoshida
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Shear Deformation ◽  
Deformation Behavior ◽  
High Speed ◽  
Adhesive Layer ◽  
Sheet Metals ◽  
Adhesively Bonded ◽  
Acrylic Adhesive ◽  
Punch Radius

In this paper, the deformation behavior of adhesive layer in die-bending for adhesively bonded sheet metals was investigated by experiments and finite element method (FEM). We paid special attention to the bending/unbending shear deformation of the adhesive layer during the die-bending of adhesively bonded sheet metals by using highly ductile acrylic adhesive. Major results obtained are summarized as follows: (1) The bending/unbending shear deformation of the adhesive layer was observed during the die-bending. (2) The punch radius has a large influence on the die-bending in the adhesively bonded sheet metals. (3) It is desirable to perform die-bending at high speed as well as air-bending.

scholarly journals Shear Deformation Behavior of Adhesive Layer in Stretch-bending/unbendingof Adhesively Bonded Dissimilar Sheet Metals

2015 ◽  
Vol 51 (7) ◽  
pp. 347-354
Author(s):  
Taro TOKUDA ◽  
Tetsuya YOSHIDA ◽  
Takeshi UEMORI ◽  
Michihiro TAKIGUCHI ◽  
Fusahito YOSHIDA
Keyword(s):  
Shear Deformation ◽  
Deformation Behavior ◽  
Adhesive Layer ◽  
Sheet Metals ◽  
Adhesively Bonded ◽  
Stretch Bending

Failure of a Ductile Adhesive Layer Constrained by Hard Adherends

1999 ◽  
Vol 122 (1) ◽  
pp. 80-85 ◽  
Author(s):  
Toru Ikeda ◽  
Akira Yamashita ◽  
Deokbo Lee ◽  
Noriyuki Miyazaki
Keyword(s):  
Fracture Toughness ◽  
Composite Materials ◽  
Thin Layer ◽  
Adhesive Joint ◽  
Structural Integrity ◽  
Adhesive Layer ◽  
Adhesive Joints ◽  
Hard Material ◽  
J Integral

The evaluation of a fracture from a thin layer constrained by a hard material is important in relation to the structural integrity of adhesive joints and composite materials. It has been reported that the fracture toughness of a crack in a ductile adhesive joint depends on the bond thickness, but the mechanism has not yet been elucidated clearly. In this study, the J-integral and the near-tip stress of a crack in an adhesive joint are investigated. It is determined that a decrease of the bond thickness increases the stress ahead of a crack rip, which results in the decrease of fracture toughness. [S0094-4289(00)01201-9]

An Analytical Model for the Vibration of Laminated Beams Including the Effects of Both Shear and Thickness Deformation in the Adhesive Layer

1986 ◽  
Vol 108 (1) ◽  
pp. 56-64 ◽  
Author(s):  
R. N. Miles ◽  
P. G. Reinhall
Keyword(s):  
Shear Deformation ◽  
Analytical Model ◽  
Equations Of Motion ◽  
Ritz Method ◽  
Adhesive Layer ◽  
Order Theory ◽  
Sixth Order ◽  
Viscoelastic Damping ◽  
Laminated Beams ◽  
Metal Layers

The equations of motion governing the vibration of a beam consisting of two metal layers bonded together with a soft viscoelastic damping adhesive are derived and solved. The adhesive is assumed to undergo both shear and thickness deformations during the vibration of the beam. In previous investigations the thickness deformation has been assumed to have negligible effect on the total damping. However, if the adhesive is very soft, and if at least one of the metal layers is stiff in bending, the thickness deformation in the adhesive can become the dominant damping mechanism. The analysis presented here comprises an extension of the well-known sixth order theory of DiTaranto, Mead, and Markus to include thickness deformation. The equations of motion are derived using Hamilton’s Principle and solutions are obtained by the Ritz method. It is shown that the use of a lightweight constraining layer which is stiff in bending will result in a design which is considerably more damped than a conventional configuration in which the adhesive is undergoing predominant shear deformation.

Application Of Electron Probe Analyses Of Minerals In Discussing The Relationship Between Ductile Deformation And Metamorphism

1990 ◽  
Vol 48 (2) ◽  
pp. 250-251
Author(s):  
Fan Guochuan ◽  
Sun Zhongshi
Keyword(s):  
Chemical Composition ◽  
Shear Deformation ◽  
Electron Probe ◽  
General Rule ◽  
Granulite Facies ◽  
Ductile Deformation ◽  
Higher Temperature ◽  
Ductile Shear ◽  
The Relationship ◽  
Ductile Shear Deformation

Under influence of ductile shear deformation, granulite facies mineral paragenesis underwent metamorphism and changes in chemical composition. The present paper discusses some changes in chemical composition of garnet in hypers thene_absent felsic gnesiss and of hypersthene in rock in early and late granulite facies undergone increasing ductile shear deformation .In garnet fetsic geniss, band structures were formed because of partial melting and resulted in zoning from massive⟶transitional⟶melanocrate zones in increasing deformed sequence. The electron-probe analyses for garnet in these zones are listed in table 1 . The Table shows that Mno, Cao contents in garnet decrease swiftly from slightly to intensely deformed zones.In slightly and moderately deformed zones, Mgo contents keep unchanged and Feo is slightly lower. In intensely deformed zone, Mgo contents increase, indicating a higher temperature. This is in accord with the general rule that Mgo contents in garnet increase with rising temperature.

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