A computational study of PCB layer orientation of WCSP assembly under temperature dependent drop impact loading

2016 ◽  
Author(s):  
Anik Mahmood ◽  
Trina Barua ◽  
Saylalee Sabne ◽  
A R Nazmus Sakib ◽  
Dereje Agonafer
Keyword(s):  
Impact Loading ◽  
Computational Study ◽  
Drop Impact ◽  
Temperature Dependent ◽  
Layer Orientation

Cracking of the Intermetallic Compound Layer in Solder Joints Under Drop Impact Loading

2011 ◽  
Vol 133 (3) ◽  
Author(s):  
Tong An ◽  
Fei Qin
Keyword(s):  
Intermetallic Compound ◽  
Solder Joint ◽  
Impact Loading ◽  
Driving Force ◽  
Solder Joints ◽  
Compound Layer ◽  
Drop Impact ◽  
Lead Free ◽  
Intermetallic Compound Layer ◽  
Crack Driving Force

The significant difference between failure modes of lead-containing and lead-free solder joints under drop impact loading remains to be not well understood. In this paper, we propose a feasible finite element approach to model the cracking behavior of solder joints under drop impact loading. In the approach, the intermetallic compound layer/solder bulk interface is modeled by the cohesive zone model, and the crack driving force in the intermetallic compound layer is evaluated by computing the energy release rate. The numerical simulation of a board level package under drop impact loading shows that, for the lead-containing Sn37Pb solder joint, the damage in the vicinity of the intermetallic compound layer initiates earlier and is much greater than that in the lead-free Sn3.5Ag solder joint. This damage relieves the stress in the intermetallic compound layer and reduces the crack driving force in it and consequently alleviates the risk of the intermetallic compound layer fracturing.

Quick Evaluation of Crashworthiness for Nonlinear Damped Systems by Using an Analytical Linearization Method

2005 ◽  
Author(s):  
Yuqi Wang ◽  
K. H. Low
Keyword(s):  
Nonlinear Analysis ◽  
Impact Loading ◽  
Linearization Method ◽  
Drop Impact ◽  
Accurate Analysis ◽  
Good Efficiency ◽  
Reliability Design ◽  
Damped Systems ◽  
The Impact ◽  
Analytical Approaches

The ability to predict crashworthiness is helpful for the cushion design. This is to minimize the impact loading on packaged products, such as drop impact loading occurring during shipment or transportation. In addition, the nonlinear characteristic of cushion system would affect the crashworthiness of the packaged goods. Therefore, an accurate analysis for the nonlinear cushion system is crucial in reliability design. However if nonlinear analysis is performed, a large computation load is required for numerical approaches; on the other hand, there is a need to include higher transcendent functions within the analytical approaches. In this paper, an analytical linearization method is applied to obtain quantitative solution in the nonlinear analysis. This method is not a numerical method, meanwhile, no high transcendent functions are considered. Therefore, the crashworthiness for nonlinear drop-impact systems can be quickly evaluated. In practical application, this method also shows good efficiency and good agreement with the experimental results.

A STUDY ON THE BEHAVIOR OF A THIN STS 304 SHEET WITH A FREE BOUNDARY CONDITIONS SUBJECTED TO IMPACT LOADING

2008 ◽  
Vol 22 (31n32) ◽  
pp. 5572-5577 ◽  
Author(s):  
D. G. AHN ◽  
G. J. MOON ◽  
C. G. JUNG ◽  
D. Y. YANG
Keyword(s):  
Free Boundary ◽  
Impact Energy ◽  
Impact Loading ◽  
Three Dimensional ◽  
Local Deformation ◽  
Drop Impact ◽  
Absorption Mechanism ◽  
Impact Tests ◽  
Deformation Behaviors ◽  
The Impact

The objective of this paper is to investigate into impact behaviors of a STS 304 sheet with a thickness of 0.7 mm in a free boundary condition subjected to impact loading by a hemispherical impact head using drop impact tests and the three-dimensional FE analyses. The drop impact tests and the FE analyses were conducted with different impact energy ranging from 37.0 J to 45.7 J. From the results of the impact tests, the influence of the impact energy on the force-deflection curve, the absorption mechanism of the impact energy and deformation behaviors of specimen were examined quantitatively. Through the FE analyses, the variation of stress-strain distributions and characteristics of the local deformation during the impact of the specimen were investigated.

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