Title :
Influences of viscoelasticity of polybutylene terephthalate (PBT) on the thermal interface contact of LED spotlight module
Author :
Hongyu Tang;Yong Yu;Min Jia;Stanley Y. Y. Leung;Cheng Qian;Cadmus C. A. Yuan;Xiang Zhou;G. Q. Zhang
Author_Institution :
State Key Laboratory of Solid-State Lighting, Changzhou, Jiangsu, 213161, China
fDate :
5/1/2014 12:00:00 AM
Abstract :
The influence of viscoelastic behavior of polybutylene terephthalate (PBT) on reliability of the thermal contact of a spotlight module is evaluated. The contact between a module and the heat sink is evaluated using non-linear finite element model. The viscoelastic behavior of PBT was obtained under multiple frequencies from single cantilever DMA experiments. The relevant viscoelastic parameters (i.e. Relaxation time τi, Shear relaxation coefficient Gn and volume relaxation coefficient Kn) were obtained by using the linear regression. The mechanical behavior of the contact interface under high temperature storage was simulated. The simulation results agree with the experimental measurement. The proposed simulation is an efficient tool to depict the effect of PBT viscoelastic behavior on the reliability of LED spotlight module.
Keywords :
"Light emitting diodes","Heat sinks","Finite element analysis","Materials","Temperature measurement","Stress","Force"
Conference_Titel :
Electronic Packaging Technology (ICEPT), 2014 15th International Conference on
DOI :
10.1109/ICEPT.2014.6922858