1111 FEM Analysis of Thermal Stress on Solder Ball for BGA Type LSI Package

2008 ◽  
Vol 2008.6 (0) ◽  
pp. 227-228
Author(s):  
Kento KIMURA ◽  
Takao IWAMOTO ◽  
Shozo NAKAMURA
Keyword(s):  
Thermal Stress ◽  
Solder Ball ◽  
Fem Analysis

FEM Analysis of Contact for Converter Spherical Hinge

2013 ◽  
Vol 365-366 ◽  
pp. 331-334
Author(s):  
Xue Ping Ren ◽  
Jian Da Gao
Keyword(s):  
Numerical Simulation ◽  
Thermal Stress ◽  
Optimum Design ◽  
Theoretical Basis ◽  
Fem Analysis ◽  
Structure Design ◽  
Coupling Field ◽  
Main Components ◽  
Spherical Hinge

The role of converter spherical hinge is one of the main components, combined with practical work and With help of FEM, Thermal Stress coupling field of spherical washer can been obtained through numerical simulation. The result supplies substantial theoretical basis for further structure design and optimum design of mechanism.

FEM Analysis on Thermal Stress of Desulphurization Injection Lance

2007 ◽  
Vol 336-338 ◽  
pp. 1531-1533
Author(s):  
Jian Qiang Qi ◽  
Yong Huang ◽  
Shi Xi Ouyang ◽  
Nan Li ◽  
Jiang Li ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Finite Element Method ◽  
Finite Element ◽  
Thermal Stress ◽  
Elastic Modulus ◽  
Fem Analysis ◽  
Finite Element Method Model ◽  
Method Model ◽  
Element Method

By means of a finite element method model, the effects of property parameters of refractory on thermal stress of injection lance have been studied. The results show that the maximum thermal stress increases with the improvement of thermal conductivity and elastic modulus of refractory, while it decreases at first and then increases with the improvement of the coefficient of expansion of refractory.

A FEM Study on Thermal Stress in Laminated Composite

2008 ◽  
Vol 373-374 ◽  
pp. 786-789 ◽  
Author(s):  
Zhi Li ◽  
Min You ◽  
Xiao Ling Zheng ◽  
Mei Rong Zhao ◽  
Jia Ling Yan
Keyword(s):  
Thermal Stress ◽  
Equivalent Stress ◽  
Laminated Composite ◽  
Fem Analysis ◽  
Interface Layer ◽  
Temperature Cycling ◽  
Stress And Strain ◽  
Von Mises Equivalent Stress ◽  
Von Mises ◽  
Peak Value

The 3-D elasto-plastic finite element method (FEM) was used to analyze the thermal stress in the laminated composite (SiC/6061Al) under the condition of a temperature cycling of 200 0C-30 0C- 200 0C-30 0C. The results from the FEM analysis showed that the hysteretic peak value of the von Mises equivalent stress in the substrate 6061Al was increased significantly as the temperature loading cycles processed on but it was nearly the same after the first cycle in the interface layer SiC of the laminated composite. The elastic strain in the substrate 6061Al varied within the range of -0.15% to 0.15% and the maximum plastic deformation was equal to about 0.26 %. The results also showed that the maximum normal stress Sx was increased from 32.8 MPa to 87.9 MPa after ten cycles and the work-hardening of the substrate 6061Al occurred during the stress and strain hysteresis loop.

FEM Analysis on Thermal Stress of Desulphurization Injection Lance

2007 ◽  
pp. 1531-1533
Author(s):  
Jian Qiang Qi ◽  
Yong Huang ◽  
Shi Xi Ouyang ◽  
Nan Li ◽  
Jiang Li ◽  
...  
Keyword(s):  
Thermal Stress ◽  
Fem Analysis

scholarly journals A THERMAL STRESS CALCULATION METHOD OF CONCRETE PAVEMENT BASED ON TEMPERATURE PREDICTION AND FEM ANALYSIS

2016 ◽  
Vol 72 (3) ◽  
pp. I_105-I_113 ◽  
Author(s):  
Tatsuo NISHIZAWA ◽  
Masashi KOYANAGAWA ◽  
Yasushi TAKEUCHI ◽  
Kazuyuki KUBO ◽  
Toru YOSHIMOTO
Keyword(s):  
Thermal Stress ◽  
Calculation Method ◽  
Fem Analysis ◽  
Concrete Pavement ◽  
Temperature Prediction ◽  
Stress Calculation

Annealing Effect of Thermal Conductivity on Thermal Stress Induced Fracture of Nuclear Graphite

2005 ◽  
Vol 297-300 ◽  
pp. 1698-1703
Author(s):  
Junya Sumita ◽  
Taiju Shibata ◽  
Masahiro Ishihara ◽  
Tatsuo Iyoku ◽  
Nobumasa Tsuji
Keyword(s):  
Thermal Conductivity ◽  
Thermal Stress ◽  
Thermal Annealing ◽  
Fem Analysis ◽  
Fracture Probability ◽  
Annealing Effect ◽  
The Core ◽  
Nuclear Graphite ◽  
Induced Defects ◽  
Irradiation Induced Defects

Graphite materials are used for structural components in the core of high temperature gas-cooled reactors (HTGRs) because of their excellent thermo/mechanical properties. When the core temperature is raised at an accident, the thermal stress of the components is induced, and it enhances the fracture probability of them. In general, the thermal conductivity of graphite is decreased by neutron irradiation due to irradiation-induced defects preventing heat conduction by phonon. It is hence expected that decreased thermal conductivity is recovered to some extent by thermal annealing at the accident. Therefore, the consideration of the thermal annealing effect is placed as much important subject in the fracture/strength evaluation of the graphite components at the accident. In the present study, the thermal stress and the fracture probability of graphite components influenced by the thermal annealing were investigated by a finite element method (FEM) analysis. It was shown that the annealing effect decreases the thermal stress and a certain level of the fracture probability.

scholarly journals Crack Initiation Criteria in EBC under Thermal Stress

Coatings ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 697 ◽  
Author(s):  
Kawai ◽  
Kakisawa ◽  
Kubo ◽  
Yamaguchi ◽  
Yokoi ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Thermal Stress ◽  
Crack Initiation ◽  
Interface Crack ◽  
Fem Analysis ◽  
Interface Fracture ◽  
Mechanical Reliability ◽  
Crack Initiation And Propagation ◽  
Environmental Barrier Coatings ◽  
Initiation And Propagation

For design of multi-layered environmental barrier coatings (EBCs), it is essential to assure mechanical reliability against interface crack initiation and propagation induced by thermal stress owing to a misfit of the coefficients of thermal expansion between the coating layers and SiC/SiC substrate. We conducted finite element method (FEM) analyses to evaluate energy release rate (ERR) for interface cracks and performed experiment to obtain interface fracture toughness to assess mechanical reliability of an EBC with a function of thermal barrier (T/EBC; SiC/SiAlON/mullite/Yb-silicate gradient composition layer/Yb2SiO5 with porous segment structure) on an SiC/SiC substrate under thermal stress due to cooling in fabrication process. Our FEM analysis revealed that a thinner SiAlON layer and a thicker mullite layer are most suitable to reduce ERRs for crack initiation at the SiC/SiAlON, SiAlON/mullite and mullite/Yb2Si2O7 interfaces. Interface fracture tests of the T/EBC with layer thicknesses within the proposed range exhibited fracture at the SiC/SiAlON and SiAlON/mullite interfaces. We also estimated the approximate fracture toughness for the SiC/SiAlON and SiAlON/mullite interfaces and lower limit of fracture toughness for the mullite/Yb2Si2O7 interface. Comparison between ERR and fracture toughness indicates that the fabricated T/EBC possesses sufficient mechanical reliability against interface crack initiation and propagation.

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