Role of residual stress on crack penetration and deflection at a bimaterial interface in a 4-point bend test

2007 ◽  
Vol 84 (1) ◽  
pp. 72-79 ◽  
Author(s):  
S. Roham ◽  
T. Hight
Keyword(s):  
Residual Stress ◽  
Bend Test ◽  
Bimaterial Interface ◽  
Crack Penetration ◽  
Point Bend Test ◽  
Point Bend

Analysis of film residual stress on a of 4-point bend test for thin film adhesion

2005 ◽  
Vol 875 ◽  
Author(s):  
Sassan Roham ◽  
Timothy Hight
Keyword(s):  
Residual Stress ◽  
Energy Release ◽  
Semiconductor Industry ◽  
Finite Size ◽  
Bimaterial Interface ◽  
Release Rates ◽  
Interface Adhesion ◽  
Crack Penetration ◽  
Energy Release Rates ◽  
Point Bend

AbstractThe four-point bend (4PB) test has emerged as a method of choice in semiconductor industry for obtaining bimaterial interface adhesion data. When measuring the interface adhesion using 4PB test, it is essential to obtain a crack through the interface of interest. The deposited films, however, posses intrinsic and extrinsic stresses which affect the ratio between energy release rates for interface cracking and crack penetration. Crack penetration and deflection at a bimaterial interface and the role of residual stress has been broadly studied before. However, the results are based on asymptotic analysis regarding interface between two semi-infinite half spaces, where the results do not directly account for boundary conditions and finite size effects of an actual test specimen. In this paper, we look at the role these residual stresses play on the competition between deflection and penetration energy release rates of a bimaterial interface and the extent of which the previous assumption of two semi-infinite media can be accepted.

scholarly journals Mechanical Performance of Honeycomb Sandwich Structures Using Three-Point Bend Test

2019 ◽  
Vol 9 (2) ◽  
pp. 3955-3958
Author(s):  
T. Subhani
Keyword(s):  
Mechanical Performance ◽  
Sandwich Structures ◽  
Bend Test ◽  
Core Material ◽  
Honeycomb Core ◽  
Adhesive Film ◽  
Honeycomb Sandwich ◽  
Point Bend Test ◽  
Three Point Bend Test ◽  
Point Bend

In this study, honeycomb sandwich structures were prepared and tested. Facesheets of sandwich structures were manufactured by carbon fiber epoxy matrix composites while Nomex® honeycomb was used as core material. An epoxy-based adhesive film was used to bond the composite facesheets with honeycomb core. Four different curing temperatures ranging from 100oC to 130oC were applied with curing times of 2h and 3h. Three-point bend test was performed to investigate the mechanical performance of honeycomb sandwich structures and thus optimize the curing parameters. It was revealed that the combination of a temperature of 110oC along with a curing time of 2h offered the optimum mechanical performance together with low damage in honeycomb core and facesheets.

FEM Modelling Techniques for Three Point Bend Test of Rubber Composites

2018 ◽  
Vol 919 ◽  
pp. 257-265 ◽  
Author(s):  
Jan Kledrowetz ◽  
Jakub Javořík ◽  
Rohitha Keerthiwansa ◽  
Pavel Nekoksa
Keyword(s):  
Test Sample ◽  
Bend Test ◽  
Rubber Matrix ◽  
Vertical Force ◽  
The Matrix ◽  
Composite Models ◽  
Modelling Techniques ◽  
Point Bend Test ◽  
Three Point Bend Test ◽  
Point Bend

This paper studies different modelling methodologies for a calculation of the three point bend test. Test samples are composed of a rubber matrix and either steel or textile cords reinforcement. Prior to the bending tests, all of the used materials including the matrix and the reinforcement were measured to find out their mechanical properties. Rubber materials were described using hyperelastic models. FEM software MSC Marc/Mentat is employed as a calculation tool and its various functionalities are utilized for a description of the test composite models. The main observed outcome is a dependence of the vertical force causing the test sample deformation on the amount of the deformation. Calculated results are compared to each other and to measurements. Then, all the modelling techniques are evaluated.

THE MINIATURISATION OF THE 4-POINT-BEND TEST

1997 ◽  
Vol 20 (11) ◽  
pp. 1605-1616 ◽  
Author(s):  
T. Lube ◽  
M. Manner ◽  
R. Danzer
Keyword(s):  
Bend Test ◽  
Point Bend Test ◽  
Point Bend
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