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Non-linear finite element simulation by an elastic-viscoplastic constitutive model and the experimental characterization were carried out to investigate the volume effect of BGA structure solder joints under shear stress. A solder mask defined flat type copper pad of a circular opening 480 μm diameter and Sn3.0Ag0.5Cu (SAC) lead-free solder balls of 300–760 μm in diameter, were used to fabricate BGA...
The influences of the standoff height (H), contact angle (θ), pad size and loading rate on shear fracture behavior of BGA structure Cu/Sn-3.0Ag-0.5Cu/Cu joints were investigated by finite element (FE) method. The simulation results show that the maximum Von Mises stress zones locate on the edge of the solder near the intermetallic compound (IMC) layer in the BGA joint under shear stress, the cracks...
After monolithic translation of superstructure, the upper structure and new foundation should be connected effectively. Installations of isolators between the topside structure and base are not only make full use of the translation material, but also enhance the security of the building. For the masonry structure of integral translation, double columns with coupling beam of the vertical bearing component...
To figure out the temperature distribution laws of laminated damping apparatus, a method based on heat flow distribution and superposition methods is proposed to solve the steady state temperature distribution of the laminated damping apparatus with nonuniform generation. Heat flow and temperature distribution formulas of the apparatus are derived. A numerical example is performed to verify the correction...
A new type of six-axis full shearing strain force sensor has been developed. It uses strain gauge as sensing element for the detection of force. The elastic body is a thin cylinder on which four holes are opened evenly in two levels. There are six Wheatstone bridges on the beams to detect the force in six directions. The sensor was designed from the results of finite element method (FEM) simulation...
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