scholarly journals Fracture Energy Measurement of Prismatic Plane and Σ2 Boundary in Cemented Carbide

JOM ◽  
2021 ◽  
Author(s):  
Max Emmanuel ◽  
Oriol Gavalda-Diaz ◽  
Giorgio Sernicola ◽  
Rachid M’saoubi ◽  
Tomas Persson ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Single Crystal ◽  
Fracture Energy ◽  
Cantilever Beam ◽  
Double Cantilever Beam ◽  
Energy Measurement ◽  
Displacement Control ◽  
Prismatic Plane ◽  
Twist Boundaries ◽  
Crystal Fracture

AbstractThe grain boundary network of WC in WC-Co is important, as cracks often travel intergranularly. This motivates the present work, where we experimentally measure the fracture energy of Σ2 twist grain boundaries between WC crystals using a double cantilever beam opened with a wedge under displacement control in a WC-10wt%Co sample. The fracture energy of this boundary type was compared with cleaving {$$10\overline{1}0$$ 10 1 ¯ 0 } prismatic planes in a WC single crystal. Fracture energies of 7.04 ± 0.36 Jm−2 and 3.57 ± 0.28 Jm−2 were measured for {$$10\overline{1}0$$ 10 1 ¯ 0 } plane and Σ2 twist boundaries, respectively.

Effect of loading rate on cohesive parameters of the adhesive Araldite 2015

2020 ◽  
Vol 62 (9) ◽  
pp. 943-950
Author(s):  
Engin Erbayrak ◽  
Halil Ozer
Keyword(s):  
Fracture Toughness ◽  
Plastic Deformation ◽  
Fracture Energy ◽  
Transition Region ◽  
Cantilever Beam ◽  
Epoxy Matrix ◽  
Loading Rate ◽  
Double Cantilever Beam ◽  
Loading Rates ◽  
Softening Behavior

Abstract This study addresses the effect of loading rates on cohesive parameters and microstructural composition of the Araldite 2015 adhesive. Double Cantilever Beam (DCB) samples were tested under the loading rates of 1, 5, 10, 20, 100 and 200 mm × min-1. The Park-Paulinho-Roeser model (PPR model) was used to get cohesive parameters. In modelling of the softening behavior, inverse analyses were performed using the date obtained from the PPR softening curves. It was seen that the fracture energy and cohesive parameters are decreasing with increasing the loading rate. However, there seems to be a transition region where the fracture energy nearly remains constant. Microstructural analyses were implemented in order to study the effects of the loading rates on the characteristics of the fracture surfaces. It was concluded that the loading rates greatly influence the distribution of micro-voids in the epoxy matrix. Moreover, the presence of voids in epoxy matrix improved the plastic deformation around the crack tip and increased the fracture toughness.

scholarly journals Experimental Study On Fracture Property Of Double Cantilever Beam Specimen With Aluminum Foam

2015 ◽  
Vol 60 (2) ◽  
pp. 1151-1154
Author(s):  
Y.C. Kim ◽  
H.K. Choi ◽  
J.U. Cho
Keyword(s):  
Fracture Energy ◽  
Cantilever Beam ◽  
Adhesive Joint ◽  
Aluminum Foam ◽  
Fracture Property ◽  
Double Cantilever Beam ◽  
Beam Specimen ◽  
Double Cantilever Beam Specimen ◽  
Opening Mode ◽  
Static Experiment

Abstract This study aims to investigate double cantilever beam specimen with aluminum foam bonded by spray adhesive to investigate the fracture strength of the adhesive joint experimentally. The fracture energy at opening mode is calculated by the formulae of British Engineering Standard (BS 7991) and International Standard (ISO 11343). For the static experiment, four types of specimens with the heights (h) of 25 mm, 30 mm, 35 mm and 40 mm are manufactured and the experimental results are compared with each other. As the height becomes greater, the fracture energy becomes higher. After the length of crack reaches 150 mm, the fracture energy of the specimen (h=35 mm) is greater than that of the specimen (h=40 mm). Fatigue test is also performed with DCB test specimen. As the height decreases, the fracture energy becomes higher. By the result obtained from this study, aluminum foam with adhesive joint can be applied to actual composite structure and its fracture property can possibly be anticipated.

scholarly journals Experimental Study On Fracture Property Of Tapered Double Cantilever Beam Specimen With Aluminum Foam

2015 ◽  
Vol 60 (2) ◽  
pp. 1459-1462
Author(s):  
Y.C. Kim ◽  
S.S. Kim ◽  
J.U. Cho
Keyword(s):  
Fracture Energy ◽  
Cantilever Beam ◽  
Fracture Behavior ◽  
Aluminum Foam ◽  
Double Cantilever Beam ◽  
Experimental Results ◽  
Experimental Result ◽  
Real Field ◽  
Adhesive Fracture ◽  
Critical Fracture

Abstract It is indispensable to evaluate fracture energy as the bonding strength of adhesive at composite material with aluminum foam. This specimen is designed with tapered double cantilever beam by British standards (BS 7991 and ISO 11343). 4 kinds of specimens due to m values of 2, 2.5, 3 and 3.5 are manufactured and compared each other with the experimental results. Adhesive fracture energy is calculated from the formulae of British standards. The value of m is the gradient which is denoted as the length and the height of specimen. As m becomes greater at static experimental result, the maximum load becomes higher and the displacement becomes lower. And the critical fracture energy becomes higher. As m becomes less at fatigue experimental result, the displacement becomes higher and the critical fracture energy becomes higher. Fracture behavior of adhesive can be analyzed by this study and these experimental results can be applied into real field effectively. The stability on TDCB structure bonded with aluminum foam composite can be predicted by use of this experimental result. Adhesive fracture energy is calculated from the formulae of British standards. Based on correlations obtained in this study, the fracture behavior of bonded material would possibly be analyzed and aluminum foam material bonded with adhesive would be applied to a composite structure in various fields, thereby analyzing the mechanical and fracture characteristic of the material.

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