Study on Contact Force of Tooth Profile Modification

2011 ◽  
Vol 328-330 ◽  
pp. 451-456
Author(s):  
Yong Ma ◽  
Qi Huang ◽  
Zhi Feng Lou ◽  
Ke Hong Li
Keyword(s):  
Finite Element ◽  
Dynamic Simulation ◽  
Contact Force ◽  
Equivalent Stress ◽  
Finite Element Models ◽  
Contact Method ◽  
Elastic Contact ◽  
Profile Modification ◽  
Single Tooth ◽  
Contact Impact

Linear, conic, cubic, and sine relief curve are compiled and established in MATLAB, on which gear models are built in UG and a new method of establishing relief gear models is proposed in this paper. Based on the theory of elastic, contact method is used on the proposed finite element models of gears by software LS-DYNA. Total contact force of teeth face, contact force of single tooth and equivalent stress on relief gears in different cases are obtained. The results show that contact impact existing in meshing between teeth of gears is ameliorated, contact force of tooth face and equivalent stress is reduced. The effect of cubic and sine relief curve is the best. So dynamic simulation on relief gears has great significance for reducing contact force between teeth faces of gears.

Study on the Effect of Ways of Gear Relief on Contact Force of Teeth Face

2011 ◽  
Vol 415-417 ◽  
pp. 66-70
Author(s):  
Yong Ma ◽  
Qi Huang ◽  
Tian Ji ◽  
Zhi Feng Lou
Keyword(s):  
Finite Element ◽  
Contact Force ◽  
Contact Analysis ◽  
Finite Element Models ◽  
Contact Method ◽  
Helical Gears ◽  
Profile Modification ◽  
Involute Gears ◽  
Main Basis ◽  
Better Than

An accurate finite element contact analysis of helical gears was done directly under ANSYS, while the integrated elastic deformation of the meshed teeth was extracted directly from the finite element contact analysis results, and considered as the main basis of the amount of tooth profile modification. Linear, conic, cubic, and sine relief curve are compiled and established in MATLAB, on which gear models of two ways of modified gear are built. Under the same modified parameters, contact method is used on the proposed finite element models of gears by software LS-DYNA, and the effect of the two ways of gear relief on contact force on teeth face is analyzed. The results show that the effect of a pair of gears relief is better than one gear relief for linear and conic relief curve, and the effect of one gear relief is better than a pair of gears relief for cubic and sine relief curve. So dynamic simulation on modified involute gears has great significance for reducing contact force of teeth face of gears.

Fracture Reasons and Improvements for the Running Gear of Shearers

2012 ◽  
Vol 490-495 ◽  
pp. 2733-2737
Author(s):  
Chun Yu Song ◽  
Jing Ru Liu ◽  
Xiu Juan Zhang
Keyword(s):  
Finite Element ◽  
Internal Stress ◽  
Contact Force ◽  
Maximum Stress ◽  
Contact Analysis ◽  
Finite Element Models ◽  
Elastic Contact ◽  
Gear Teeth ◽  
Calculation Results ◽  
Contact Spots

Running traction mechanism of shearers is adopted as the analysis object in this paper. The finite element models for the elastic contact analysis between the running gears and pin-rails are created. When the gears are running, the variation principles of contact spots, contact force, and internal stress for the gears and pin-rails at the different contact positions are analyzed. The calculation results show that the maximum stress is located at the edges of the gear teeth for the different contact positions. When the teeth are loaded with the repeated large stress, cracks are produced at the tooth edges at first and then are growing. The tooth breakage is produced at last. Gear chamfers using two circulars at the tooth edges can change the location of the maximum stress and the maximum MISES stress can be reduced by 20% or more. Therefore, the fracture problem of gear teeth is solved basically.

scholarly journals Strain Hardening From Elastic–Perfectly Plastic to Perfectly Elastic Flattening Single Asperity Contact

2018 ◽  
Vol 141 (3) ◽  
Author(s):  
Hamid Ghaednia ◽  
Matthew R. W. Brake ◽  
Michael Berryhill ◽  
Robert L. Jackson
Keyword(s):  
Finite Element ◽  
Contact Force ◽  
Material Model ◽  
Real Contact Area ◽  
Contact Radius ◽  
Elastic Contact ◽  
Elastic Deformations ◽  
Real Contact ◽  
Perfectly Plastic ◽  
Elastic Perfectly Plastic

For elastic contact, an exact analytical solution for the stresses and strains within two contacting bodies has been known since the 1880s. Despite this, there is no similar solution for elastic–plastic contact due to the integral nature of plastic deformations, and the few models that do exist develop approximate solutions for the elastic–perfectly plastic material model. In this work, the full transition from elastic–perfectly plastic to elastic materials in contact is studied using a bilinear material model in a finite element environment for a frictionless dry flattening contact. Even though the contact is considered flattening, elastic deformations are allowed to happen on the flat. The real contact radius is found to converge to the elastic contact limit at a tangent modulus of elasticity around 20%. For the contact force, the results show a different trend in which there is a continual variation in forces across the entire range of material models studied. A new formulation has been developed based on the finite element results to predict the deformations, real contact area, and contact force. A second approach has been introduced to calculate the contact force based on the approximation of the Hertzian solution for the elastic deformations on the flat. The proposed formulation is verified for five different materials sets.

Comparative Analysis and Selection of Seal Structure between the Piston and Casing of Rapping Device

2012 ◽  
Vol 487 ◽  
pp. 401-405 ◽  
Author(s):  
Jiu Yang Yu ◽  
Yi Wen Chen ◽  
Xiao Tao Zheng ◽  
Wei Lin ◽  
Si Hao Nie
Keyword(s):  
Finite Element ◽  
Comparative Analysis ◽  
Equivalent Stress ◽  
Fluid Pressure ◽  
Nonlinear Finite Element ◽  
Finite Element Models ◽  
Working Pressure ◽  
Von Mises Equivalent Stress ◽  
Von Mises ◽  
Selection Of

ANSYS was employed to build nonlinear finite element models of seal structure of double-Y and quad-ring between the piston and casing of rapping device respectively. The relationships of the contact stress versus fluid pressure and the Von-Mises equivalent stress versus working pressure of fluid were obtained. The comparison of the two calculated results presented the seal structure of double-Y was proper for rapping device between the piston and casing.

Finite Element Analysis of Stamped Tees Stress in Directly Buried Heating Pipeline

2013 ◽  
Vol 405-408 ◽  
pp. 997-1001
Author(s):  
Guo Qiang Yu ◽  
Fei Wang ◽  
Guang Du
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Structure Analysis ◽  
Optimization Design ◽  
Equivalent Stress ◽  
Finite Element Models ◽  
Element Analysis ◽  
Intersection Area ◽  
Maximum Equivalent Stress ◽  
Displacement Constraints

In order to provide evidence for optimization design of directly buried heating pipeline tees, finite element models of tees with different ratios of branch-main pipe diameters had been established and simulated by structure analysis soft ANSYS. The change law of maximum equivalent stress values in pipe-nozzle intersection area had been obtained at same temperature, pressure loads and displacement constraints. The results show that maximum equivalent stress values of stamped tees are less than welded tees with same specifications. And stamped tees with lager fillet radius and local wall thickness can effectively decrease maximum equivalent stress values of pipe-nozzle intersection area.

Study on Dynamic Simulation of Buffering Mechanism with Liquid Bag

2013 ◽  
Vol 397-400 ◽  
pp. 546-550
Author(s):  
Ming Zhang ◽  
Rui Jiang ◽  
Chun Yang ◽  
Li Cao
Keyword(s):  
Finite Element ◽  
Dynamic Simulation ◽  
Outer Part ◽  
Element Model ◽  
Contact Method ◽  
Buffering Effect ◽  
Finite Element Software ◽  
Simulation Results ◽  
Contact Relation ◽  
The Finite Element Model

The finite element model of buffering mechanism with liquid bag is constructed using finite element software MSC. Patran. The liquid bag is clamped between the inner part and outer part, and the contact relation is modeled by contact method in the finite element software MSC. Dytran. An airbag module in MSC. Dytran is used to simulate the buffering effect of the liquid bag equivalently. Then dynamic simulation results is presented and compared with the experimental results. The validity of the model is verified and contributes to further analyses of liquid bag.

Simulation on Safety Property of Inner Support in Tire

2016 ◽  
Vol 835 ◽  
pp. 639-642
Author(s):  
Xu Zhang ◽  
Qi He Zhang ◽  
Guang Qi Wang ◽  
Kun Lun Wu ◽  
Da Song ◽  
...  
Keyword(s):  
Finite Element ◽  
Dynamic Simulation ◽  
Fatigue Damage ◽  
Optimization Method ◽  
Finite Element Models ◽  
Damage Analysis ◽  
Multi Objective Optimization ◽  
Safety Property ◽  
Fatigue Damage Analysis ◽  
New Type

Multi-objective optimization method was adopted for obtaining appropriate dimensions of a new type of inner support in tire. Based on optimized inner support in tire with three monomer block components, finite element models were established by HyperMesh, and dynamic simulation on safety property was completed on LsDyna3D. For this type of inner support in tire, strength is enough during tire burst. After fatigue damage analysis, safety property of inner support after tire burst is well enough too. It is certain for the inner support to work well not only during tire burst but also after tire burst.

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