Please use this identifier to cite or link to this item: https://doi.org/10.1109/EPTC.2007.4469819
Title: A study of the effect of viscoelasticity on delamination in a plastic IC package undergoing leadfree solder reflow
Authors: Guojun, H.H.
Tay, A.A.O. 
Yongwei, Z.
Chew, S.
Issue Date: 2007
Source: Guojun, H.H., Tay, A.A.O., Yongwei, Z., Chew, S. (2007). A study of the effect of viscoelasticity on delamination in a plastic IC package undergoing leadfree solder reflow. Proceedings of the Electronic Packaging Technology Conference, EPTC : 686-692. ScholarBank@NUS Repository. https://doi.org/10.1109/EPTC.2007.4469819
Abstract: Over the glass transition temperature, epoxy molding compound strongly exhibits viscoelastic behavior which causes its Young's modulus to be not only temperaturedependent but also time-dependent. In the present study, the viscoelastic properties of an epoxy molding compound were measured and used in a delamtoation analysis. To establish a suitable failure criterion for delamtoation, end-notched flexure tests have been conducted at varying temperatures under different loading rates. The C(t) integral and J-integral were investigated as possible criteria for interfacial delamtoation involving viscoelastic materials. It was found that while both are suitable, the J-integral is better. A very significant finding from this study is that the fracture toughness of the interface between the molding compound and copper increases with temperature when the viscoelastic behaviour of the molding compound is taken into account. Finally, the delamtoation of the pad/encapsulant interface in a 160-leaded PQFP undergoing leadfree solder reflow was simulated using the delamtoation criterion established. © 2007 IEEE.
Source Title: Proceedings of the Electronic Packaging Technology Conference, EPTC
URI: http://scholarbank.nus.edu.sg/handle/10635/73102
ISBN: 1424413249
DOI: 10.1109/EPTC.2007.4469819
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