scholarly journals DESIGN OPTIMIZATION AND HIGH CYCLE FATIGUE ANALYSIS AND OF A DIFFERENTIAL CASE

2018 ◽  
Author(s):  
Praveen Bulusu Surya Naga
Keyword(s):  
Design Optimization ◽  
High Cycle Fatigue ◽  
Fatigue Analysis ◽  
Cycle Fatigue

Deformation and Fatigue Analysis of Micro Thermal-Electrostatic Actuator Devices

Volume 3 ◽  
2004 ◽  
Author(s):  
Jeng-Nan Hung ◽  
Meng-Ju Lin ◽  
Chung-Li Hwan
Keyword(s):  
Applied Voltage ◽  
High Cycle Fatigue ◽  
Fatigue Analysis ◽  
Flexible Beam ◽  
Cycle Fatigue ◽  
Fatigue Cycle ◽  
Electrostatic Actuator ◽  
Beam Length ◽  
The Difference ◽  
Cold Arms

Micro thermal-electrostatic actuator devices are widely used in MEMS. However, the effect of structure sizes on deformation and fatigue is seldom discussed. In this work, the effect of structure sizes on deformation and fatigue is investigated. In this device, two beams called hot and cold arms with different width under applied voltage will have different elongation for there different width and the structure will cause the structure laterally bent. Theoretical solutions of deformation and stresses are derived. And numerical methods of finite element are used to analyze for details. The stresses obtained from the finite element are used in fatigue analysis. In the fatigue analysis, high-cycle fatigue model is used as the load in the elastic regime. Considering the accumulation of damage by fatigue being linear, Miner theory is used to estimate the life of the thermal-electrostatic devices under high-cycle fatigue. The result shows with the same length and flexible beam length connecting the hot and cold arms, the large width will cause larger displacement and stresses. However, the difference is not significant. It is also found that as the applied voltage increasing, the displacement and stresses will increase nonlinearly. With the same width and flexible beam length, the larger length will cause larger stresses and small displacement. For fatigue analysis, as the gap increasing and the length and width decreasing, the fatigue cycle increases. It shows when the length and gap are 220 and 5 μm, the fatigue cycle of 50 μm width is more than ten times of 90 μm width. When the width and gap are 50 and 5 μm, the fatigue cycle of 220 μm length is more than ten times of 260 μm length. When the length and width are 220 and 50 fatigue cycles of 50 μm width are more than ten times of 90 μm width, the difference of fatigue cycle between gap 9 and 5 μm is more than 10 times. However, the most significant effect on fatigue is the applied voltage. It shows the fatigue cycle decays very fast as the applied voltage increasing. When the applied voltages are 2 and 8 volts, the fatigue cycles will decrease from 1018 to less than 108. As the applied voltage being 25 volt, the fatigue cycle near zero. Therefore, the limit applied voltage is about 25 volt.

scholarly journals High cycle fatigue analysis in the presence of autofrettage compressive residual stress

2018 ◽  
Vol 41 (11) ◽  
pp. 2305-2320
Author(s):  
V. Okorokov ◽  
D. MacKenzie ◽  
Y. Gorash ◽  
M. Morgantini ◽  
R. van Rijswick ◽  
...  
Keyword(s):  
Residual Stress ◽  
Compressive Residual Stress ◽  
High Cycle Fatigue ◽  
Fatigue Analysis ◽  
Cycle Fatigue

The Engine Connecting Rod Strength Evaluation and Fatigue Analysis

2012 ◽  
Vol 549 ◽  
pp. 812-815
Author(s):  
Yu Qing Zheng ◽  
Zhen Lin Wang ◽  
He Ji Ke ◽  
Bing Li
Keyword(s):  
Stress Analysis ◽  
High Cycle Fatigue ◽  
Gasoline Engine ◽  
Fatigue Analysis ◽  
Inertia Force ◽  
Cycle Fatigue ◽  
Connecting Rod ◽  
Design Strength ◽  
Explosion Pressure ◽  
Simulation Results

In this paper, all parts of the gasoline engine connecting rod were assembled and the stress analysis was executed in two working cases of the maximum explosion pressure and the maximum inertia force based on ABAQUS. According to the simulation results from two above working cases, the engine connecting rod strength was evaluated comprehensively, which could satisfy the rod design strength requirement. And meanwhile the high cycle fatigue analysis of the connecting rod was also completed in fatigue safe module. The fatigue simulation result showed that the safety factor was greater than the specified value and the connecting rod was reliable.

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