scholarly journals Unified Creep Plasticity Damage (UCPD) Model for SAC396 Solder

2013 ◽  
Author(s):  
Michael Neilsen ◽  
Paul Vianco
Keyword(s):  
Finite Element ◽  
Solder Joints ◽  
Element Analysis ◽  
Damage Evolution Equation ◽  
Thermal Mechanical Fatigue ◽  
Model Predictions ◽  
Solder Fatigue ◽  
Solder Joint Fatigue ◽  
The Relationship ◽  
Model Crack

A unified creep plasticity damage (UCPD) model for Sn-Pb and Pb-free solders was developed and implemented into finite element analysis codes. The new model will be described along with the relationship between the model’s damage evolution equation and an empirical Coffin-Manson relationship for solder fatigue. Next, developments needed to model crack initiation and growth in solder joints will be described. Finally, experimentally observed cracks in typical solder joints subjected to thermal mechanical fatigue are compared with model predictions. Finite element based modeling is particularly suited for predicting solder joint fatigue of advanced electronics packaging, e.g. package-on-package (PoP), because it allows for evaluation of a variety of package materials and geometries.

UCPD Model for Pb-Free Solder

2014 ◽  
Vol 136 (4) ◽  
Author(s):  
Michael K. Neilsen ◽  
Paul T. Vianco
Keyword(s):  
Finite Element ◽  
Solder Joints ◽  
Element Analysis ◽  
Damage Evolution Equation ◽  
Thermal Mechanical Fatigue ◽  
Model Predictions ◽  
Solder Fatigue ◽  
Solder Joint Fatigue ◽  
Free Solder ◽  
The Relationship

A unified creep plasticity damage (UCPD) model for eutectic Sn-Pb and Pb-free solders was developed and implemented into finite element analysis codes. The new model will be described along with the relationship between the model's damage evolution equation and an empirical Coffin–Manson relationship for solder fatigue. Next, developments needed to model crack initiation and growth in solder joints will be described. Finally, experimentally observed cracks in typical solder joints subjected to thermal mechanical fatigue are compared with model predictions. Finite element based modeling is particularly suited for predicting solder joint fatigue of advanced electronics packaging, e.g. package-on-package (PoP), because it allows for evaluation of a variety of package materials and geometries.

A Capability to Model Crack Initiation and Growth in Solder Joints

2009 ◽  
Author(s):  
Mike Neilsen ◽  
Paul Vianco ◽  
Alice Kilgo ◽  
Elizabeth Holm
Keyword(s):  
Finite Elements ◽  
Crack Initiation ◽  
Solder Joints ◽  
Acceleration Factor ◽  
Element Analysis ◽  
Damage Evolution Equation ◽  
Thermal Mechanical Fatigue ◽  
Modeling Approach ◽  
Geometric Effects ◽  
Model Crack

A new capability to model both crack initiation and growth in eutectic Sn-Pb solder joints was developed and implemented into finite element analysis codes. Two significant developments were needed to create this new capability. First, an ability to accelerate the simulations such that the effects of hundreds or thousands of thermal cycles could be modeled in a reasonable amount of time was needed. This was accomplished by applying a user prescribed acceleration factor to specific terms in the solder model’s damage evolution equation; then, the damage generated by an acceleration factor of cycles could be captured by the numerical simulation of a single thermal cycle. Second, an ability to capture the geometric effects of crack initiation and growth was needed. This was accomplished by replacing material in finite elements that had met the cracking failure criterion with very flexible elastic material. This diffuse crack modeling approach with local finite elements is known to generate mesh-dependent solutions. However, mesh refinement studies revealed that for thermal mechanical fatigue simulations, the mesh dependency is small and has a small effect on predictions for cycles to generate an electrical open. The new crack modeling approach will be described. Finally, crack predictions are compared with experimental observations.

Analysis of magnetic force and dynamic characteristic for non-contact permanent magnet linear drive device

2020 ◽  
Vol 64 (1-4) ◽  
pp. 1337-1345
Author(s):  
Chuan Zhao ◽  
Feng Sun ◽  
Junjie Jin ◽  
Mingwei Bo ◽  
Fangchao Xu ◽  
...  
Keyword(s):  
Finite Element ◽  
Permanent Magnet ◽  
Dynamic Characteristic ◽  
Driving Force ◽  
Magnetic Circuit ◽  
Response Speed ◽  
Computation Method ◽  
Element Analysis ◽  
Element Simulation ◽  
The Relationship

This paper proposes a computation method using the equivalent magnetic circuit to analyze the driving force for the non-contact permanent magnet linear drive system. In this device, the magnetic driving force is related to the rotation angle of driving wheels. The relationship is verified by finite element analysis and measuring experiments. The result of finite element simulation is in good agreement with the model established by the equivalent magnetic circuit. Then experiments of displacement control are carried out to test the dynamic characteristic of this system. The controller of the system adopts the combination control of displacement and angle. The results indicate that the system has good performance in steady-state error and response speed, while the maximum overshoot needs to be reduced.

Finite Element Analysis of the ESTELA M1 Airplane Firewall (Representative Specimen)

2011 ◽  
Author(s):  
V. Ramirez-Elias ◽  
E. Ledesma-Orozco ◽  
H. Hernandez-Moreno
Keyword(s):  
Finite Element ◽  
Federal Aviation Administration ◽  
Element Model ◽  
Maximum Load ◽  
Load Factor ◽  
Representative Specimen ◽  
Maximum Displacement ◽  
Element Analysis ◽  
Element Simulation ◽  
The Relationship

This paper shows the finite element simulation of a representative specimen from the firewall section in the AEROMARMI ESTELA M1 aircraft. This specimen is manufactured in glass and carbon / epoxy laminates. The specimen is subjected to a load which direction and magnitude are determined by a previous dynamic loads study [10], taking into account the maximum load factor allowed by the FAA (Federal Aviation Administration) for utilitarian aircrafts [11]. A representative specimen is manufactured with the same features of the firewall. Meanwhile a fix is built in order to introduce the load directions on the representative specimen. The relationship between load and displacement is plotted for this representative specimen, whence the maximum displacement at the specific load is obtained, afterwards it is compared with the finite element model, which is modified in its laminate thicknesses in order to decrease the deviation error; subsequently this features could be applied to perform the whole firewall analysis in a future model [10].

scholarly journals Prediction of Thermal Fatigue Life of Lead-Free BGA Solder Joints by Finite Element Analysis

2001 ◽  
Vol 42 (5) ◽  
pp. 809-813 ◽  
Author(s):  
Young-Eui Shin ◽  
Kyung-Woo Lee ◽  
Kyong-Ho Chang ◽  
Seung-Boo Jung ◽  
Jae Pil Jung
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fatigue Life ◽  
Thermal Fatigue ◽  
Solder Joints ◽  
Lead Free ◽  
Element Analysis ◽  
Thermal Fatigue Life

Research on Deflection Analysis and Compensation Method of Ram of Boring and Milling Machining Center

2014 ◽  
Vol 633-634 ◽  
pp. 693-698
Author(s):  
Long Xin ◽  
Shi Chao Cui ◽  
Qi Lin Shu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Least Squares Method ◽  
Preliminary Calculation ◽  
Element Analysis ◽  
Object A ◽  
Machining Center ◽  
Deflection Analysis ◽  
Long Stroke ◽  
The Relationship

In this paper, the ram of boring and milling machining center is taken as the research object. A new method that hydraulic pull rods compensation is proposed to solve the problem of deformation compensation of long stroke ram of boring and milling machining center. Firstly, the method of finite element analysis is used to get the laws of ram deformation and the relationship curve between the ram deformation and the stroke of ram. Secondly, the preliminary calculation value of pull rods compensation force is derived based on the theoretical analysis of material mechanics. The relationship curve between compensation force and the stroke of ram is obtained by finite element analysis and polynomial least squares method. Finally, the analyzed results are as follows: the laws of ram deformation distribution is accurately predicted by the used method, the deflection error of the ram is well controlled,and the machining precision is significantly improved.

Finite Element Analysis of Temperature and Stress Distributions on Touching Area of Freight Train Wheel

2011 ◽  
Vol 120 ◽  
pp. 56-60
Author(s):  
Han Wu Liu ◽  
Zhi Qiang Li ◽  
Yun Hui Du ◽  
Peng Zhang
Keyword(s):  
Finite Element ◽  
Development Trend ◽  
Stress Distributions ◽  
Railway Transportation ◽  
Element Analysis ◽  
Work Condition ◽  
Freight Train ◽  
The Development Trend ◽  
The Relationship ◽  
Wheel Track

With the development trend of constant speeding and heavy loading of the railway transportation, the freight train wheels which take the way of touching area breaking are in the bad conditions of strong friction, fever load and big wheel track forces. After many times’ repeated breaking, the wheels will come to be thermal fatigue, then, result in expired puncture. In this article, according to the actual work condition of the freight train wheel, its temperature and stress fields in the process of an urgently breaking when the wheel speed is 120 km/h with the 21 tons shaft weight were analyzed and simulated by Finite Element Method. The relationship between the injury occurring on the touching area of freight wheel and the fields of the temperature and stress was also studied. The research results showed that the maximum values of the temperature and thermal stress lied in the breaking process all locate in the touching friction area between the breaking and the wheel, and the temperature rises continuously with the breaking process going on. When the value of the temperature gets to the crest value, it slowly descends. The wheel temperature reduces from the touching area to the wheel shaft, and the nearer of the distance to wheel shaft, the lower of the temperature and stress values. After the end of the breaking process, the temperature into the wheel is higher than that on the touching area, and the maximum stress exists under the wheel touching area.

3D FEA Modeling of Hard Turning

2002 ◽  
Vol 124 (2) ◽  
pp. 189-199 ◽  
Author(s):  
Y. B. Guo ◽  
C. R. Liu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Geometric Model ◽  
Friction Model ◽  
Dominant Factor ◽  
Analysis Model ◽  
Element Analysis ◽  
Plastic Properties ◽  
Fea Model ◽  
Model Predictions

A practical explicit 3D finite element analysis model has been developed and implemented to analyze turning hardened AISI 52100 steels using a PCBN cutting tool. The finite element analysis incorporated the thermo-elastic-plastic properties of the work material in machining. An improved friction model has been proposed to characterize tool-chip interaction with the friction coefficient and shear flow stresses determined by force calibration and material tests, respectively. A geometric model has been established to simulate a 3D turning. FEA Model predictions have reasonable accuracy for chip geometry, forces, residual stresses, and cutting temperatures. FEA model sensitivity analysis indicates that the prediction is consistent using a suitable magnitude of material failure strain for chip separation, the simulation gives reasonable results using the experimentally determined material properties, the proposed friction model is valid and the sticking region on the tool-chip interface is a dominant factor of model predictions.

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