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Simulation of thermal stresses in gold wires was rarely reported in previous days due to the difficulties in FE model building. In this study, the 3D modeling was performed to evaluate the thermal stresses in gold wires with the entire package model to identify which wires to peel when verifying the second bond. The FE model in this study included the wire loops and the second bond (stitch bond) geometries...
The existence of viscosity effect at the interface of double dissimilar materials has an important impact to the distribution of interface crack-tip field and the properties variety of the interface itself. The singular is considered in crack-tip, and the elastic-viscoplastic quasi-static propagating governing equations of double dissimilar materials at interface crack-tip field are established. The...
According to energy conservation from the destruction of rock catastrophe, a new calculation method of the length of fracture propagation in hydraulic fracturing is proposed, and assuming the crack extends to approximate ellipse, the width calculation model of fracture extension is established. By using this new method in Changsheng well of Jilin oilfield, And the maximum error between the productivity...
In ULSI metallization with tantalum barriers the highest stress is generally induced in the barrier, because in the structure tantalum has the highest young modulus compared to the other materials. Regarding this barrier cracking can occur due to the high stress values. In this work possible approaches to simulate cracking appearances are selected from the literature and their feasibility will be...
A numerical simulation based on the pressure-sensitive yield criterion of Gurson mesomechanics model is presented for explicit dynamic finite element calculations of SS304 bar under tension at high rates of strain. The necking process, including void nucleation and coalescence, is modeled numerically. The result shows clearly the crack propagation and eventual separation. The numerical analysis is...
The plastic buckling calculation of the centrifugal concreted-filled steel tubes under torsion was derived from the cylindrical shells with spiral stiffeners analogy. In applying the analogy, it is assumed that under torsion, concrete compression parts between the diagonal cracks work as spiral stiffeners of steel shells, based on the plastic performance and mechanism of the tubes under experiment...
Precision bar cutting process is a typical large localized plastic deformation process. Based on its forming characteristics, a numerical model is established and an elasto-plastic simulation is performed using the finite element method (FEM). The re-meshing method is used when the severe element distortion occurs to facilitate further computation and avoid divergence. The Normalized Cockroft &...
Through an aggressive product development program which includes experiment and simulation, Amkor has developed the next level of WLCSP (CSPnltrade), a product which exhibits superior board level reliability when subjected to drop impact, a strong requirement for portable electronics. Failure mechanism of WLCSP under drop test has been established. Depending on type of WLCSP and test board design,...
Therepsilare many kinds of bending test conditions according to different control modes: displacement control, force control and strain control. In our paper, strain-controlled bending test was chosen, since the lifetime and failure modes were more sensitive relating to different loading strain range and strain rate. ANSYS was used to simulate the bending test to predict board level solder joint reliability...
The hard turning of AISI 4340 is taken as an example. First, thermo-mechanical coupled cutting model is set up with Abaqus\Explicit software. Then, different friction coefficient for chip formation is studied for the reason of crack and heat softening. Additionally, another increased strain energy release rate is studied with different friction coefficient. Finally, the result shows that the friction...
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