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Stress-induced solder joint failure is one of the most common modes of printed circuit board assembly (PCBA) failures. Today, this problem is further exasperated with the introduction of lead-free solder material, which, for similar tensile and compressive strengths, is almost twice as brittle as the traditional tin-lead solder. Various assembly and test processes can cause solder joint failures on PCBAs by over-flexing them even before they are shipped out. Strain gage testing allows objective analysis of the strain and strain rate levels that a Surface Mount Technology (SMT) package is subjected to during PCB assembly, test and operation. The IPC/JEDEC-9704 document gives specific guidelines for strain gage testing for PCB assemblies in the board manufacturing process including, assembly, test, system integration and board shipping. The suggested procedure enables board assemblers to conduct required strain gage testing independently, and provides a quantitative method for measuring board flexure, and accessing risk levels. The IPC/JEDEC-9702 document specifies a common method of establishing the fracture resistance of board-level device interconnects to flexural loading. |
 White paper: Identify and Characterize Damaging PCB Assembly and Test Processes Using Strain Gage Testing |
 Online Demo: Implementing Strain Gage Tests for Printed Circuit Board Assemblies |
 Download an example LabVIEW program for PCB Strain Gage Testing from the link below |
Download a presentation on PCB Strain Gage Testing
Purchase products featured in this tutorial.
Reader Comments | Submit a comment »
Powerpoint presentation added. Thanks,
- Swapnil Padhye, National Instruments. swapnil.padhye@ni.com - Jul 6, 2007
Where's the ppt on pcb strain measurements?
I spoke with an application engineer at
the sensor show and he told me to
come to this location to find the PPT
discussing this application and it seems
to be missing from the web site. Can
someone please forward it to me?
Thanks
Rich Slates
General Electric
775-215-1892
richard.slates@ge.com
- richard slates, general electric. richard.slates@ge.com - Jun 19, 2007
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