On the Shear Strength and Mixed-mode Fracture Toughness of a Lead-Tin and a Tin-Silver Solder

1998 ◽  
Vol 515 ◽  
Author(s):  
M. Manoharan ◽  
K. S. SIOW ◽  
M. W. WEISER
Keyword(s):  
Shear Strength ◽  
Mixed Mode ◽  
Compact Tension ◽  
Compact Tension Specimen ◽  
Bulk Solder ◽  
Shear Loading ◽  
Mixed Mode Fracture ◽  
Traditional Role ◽  
Mode Fracture ◽  
Lap Shear

ABSTRACTThe increasing demands on solder joints have made it imperative that they perform not only their traditional role of electrical connection but also possess good mechanical integrity. One such key mechanical property is the shear strength of the solder. A number of specimen geometries can be used to evaluate the shear strength of solders, each with its advantages and limitations. This study uses a modified double lap shear geometry to measure the shear strength of the solders as a function of strain rate. It is ahown that the shear strength measured this way is truly reflective of the complex composite formed by the copper, solder and intermetallics and may be more representative of actual conditions of use rather than measurements of the shear strengths of the bulk solder. The study also uses a modified compact tension specimen to measure the fracture of the solder under combined tensile-shear loading conditions. It is shown that the solder fracture under these conditions follows the general principles of a mixed-mode fracture mechanism map.

Fracture of a Lead-Tin and a Tin-Silver Solder Under Combined Tensile Shear Loading

1999 ◽  
Vol 563 ◽  
Author(s):  
M. Manoharan ◽  
K. S. Siow
Keyword(s):  
Shear Strength ◽  
Compact Tension ◽  
Compact Tension Specimen ◽  
Shear Loading ◽  
Tensile Shear ◽  
Tension Specimen ◽  
Traditional Role ◽  
Ductile Materials ◽  
Mode Of Failure

AbstractThe increasing demands on solder joints have made it imperative that they perform not only their traditional role of electrical connection but also possess good mechanical integrity. One such key mechanical property is the shear strength of the solder. A number of specimen geometries can be used to evaluate the shear strength of solders, each with its advantages and limitations. However, these geometries do not provide information about the notched fracture strength of the solder under shear. Studies on a number of ductile materials have indicated that in many of these materials shear is the preferential mode of fracture even when the imposed load is a combination of tensile and shear. This study, which is part of a larger project on the failure of materials under combined tensile-shear loading, uses a modified compact tension specimen to measure the appropriate failure criterion. It is shown that the fracture of solders under these conditions follows the general principles of a mixedmode fracture mechanism map and shear is the preferred mode of failure.

scholarly journals An Experimental and Numerical Investigation of the Mixed-Mode Fracture Toughness and Lap Shear Strength of Aerospace Grade Composite Joints

2011 ◽  
Vol 488-489 ◽  
pp. 549-552
Author(s):  
J. Mohan ◽  
A. Karač ◽  
Neal Murphy ◽  
Alojz Ivanković
Keyword(s):  
Fracture Toughness ◽  
Mixed Mode ◽  
Experimental Tests ◽  
Numerical Approach ◽  
Mixed Mode Fracture ◽  
Joint System ◽  
Mode Fracture ◽  
Post Process ◽  
Composite Joint ◽  
Lap Shear

In the present study, the mixed-mode fracture toughness of an adhesively bonded composite joint system was examined using a variety of linear elastic fracture mechanics (LEFM) based tests. These tests include the mode I double cantilever beam (DCB), mixed-mode asymmetrical DCB (ADCB) and mode II end load split (ELS) test. The joint system was also evaluated using the wide area lap shear (WALS) test that is often employed by the aerospace industry. While lap shear type tests are relatively simple to perform and post-process compared to their LEFM counterparts, the results can often be misleading and are greatly dependent on the overlap length, thickness of substrate and type of fillet. The experimental tests were also simulated using OpenFOAM, a finite volume based software package. Through this combined experimental-numerical approach, a greater understanding of the influence of the peel ply surface treatment and scrim cloth on the behaviour of the WALS test was achieved.

Sign in / Sign up

Export Citation Format

Share Document