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With the progress of the lead-free in electronics industry, the reliability of SAC 305 lead-free solder joint is particularly important. According to typical components (BGA) suffering from thermal cycling and thermal aging test, present the fatigue life of the solder joint. Check the solder joint cracking at different cycling. Cross section and metallographic microscope are performed to inspect the...
The purpose of this work is to conduct the multi-physics simulation analysis of LED-based luminaires under certain temperature and humidity environment, and to find out the vulnerable spot of the luminaire. The coupled modeling of LED luminaire during step stress accelerated test (SSAT) is simulated by ANSYS. Five types of modeling, i.e. thermal and thermo-mechanical modeling, moisture diffusion and...
Carboxylic acid functionalized deacetylated konjac glucomannan was synthesized by free radical graft copolymerization of methyl acrylate (MA) and methyl methacrylate (MMA) onto the backbone of deacetylated konjac glucomannan with subsequent chemical activation of the ester groups in the side chains of the resulting graft copolymer by sodium hydroxide. Effects of sodium hydroxide concentration and...
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