Technical Library | 2014-10-30 01:48:43.0
The ultimate life of a microelectronics component is often limited by failure of a solder joint due to crack growth through the laminate under a contact pad (cratering), through the intermetallic bond to the pad, or through the solder itself. Whatever the failure mode proper assessments or even relative comparisons of life in service are not possible based on accelerated testing with fixed amplitudes, or random vibration testing, alone. Effects of thermal cycling enhanced precipitate coarsening on the deformation properties can be accounted for by microstructurally adaptive constitutive relations, but separate effects on the rate of recrystallization lead to a break-down in common damage accumulation laws such as Miner's rule. Isothermal cycling of individual solder joints revealed additional effects of amplitude variations on the deformation properties that cannot currently be accounted for directly. We propose a practical modification to Miner's rule for solder failure to circumvent this problem. Testing of individual solder pads, eliminating effects of the solder properties, still showed variations in cycling amplitude to systematically reduce subsequent acceleration factors for solder pad cratering. General trends, anticipated consequences and remaining research needs are discussed
Parts & Supplies | Pick and Place/Feeders
Leaderway company was established in 2012, SMT electronic manufacturing service company, service customers involved in EMS electronics manufacturing products in various areas, like smart phone, automotive electronics, earphones, air conditioners, c
Industry Directory | Manufacturer's Representative
Manufacturers' Representative covering Florida, Puerto Rico and the Dominican Republic. TRC specializes in electronics assembly, inspection, repair equipment and synergistic products.
Used SMT Equipment | Pick and Place/Feeders
We have 2 Zevatech Juki PM570 pick and place machines with laser centering in perfect condition. It was upgraded: added soft start and USB (instead floppy). Both machines are selling with many feeders, 8,12, and universal (8/16
PVS-801 and PVS-901 - Part Verification Systems to STOP WRONG PARTS during PCB Assembly
IPC in the UK accredited trainers to the electronics manufacturing industry.
Industry Directory | Association / Non-Profit
HDP User Group is a non-profit trade organization that offers memberships to companies involved in the supply chain of manufacturing products that utilize high-density electronic packages.
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Parts & Supplies | SMT Equipment
New-style Universal PCB-Supports module is a new product that is specially designed for solving following problems: a large amount of debug time and possible damage to component and PCB microcircuitry caused by hard pin and gauge when using high-den
Industry Directory | Association / Non-Profit / Research Institute / Laboratory / School
The Applied Physics Laboratory (APL) is a not-for-profit center for engineering, research, and development.
Used SMT Equipment | Pick and Place/Feeders
Make: PanasonicModel: CM602-L Details:1.High-speed mounting capability: Equipped with a 12-nozzle high-speed mounting head, the mounting speed can reach 100,000 CPH (0.036 seconds per chip), suitable for fast production needs .2.Precise mounting: Mo
