scholarly journals Bending Durability of Ni-Mo pre-alloyed Sintered Steel Case-Carburizing Gears with Different Densities and Tooth Root Bending Stress Analysis Using FEM Model Considering Voids

2016 ◽  
Vol 63 (1) ◽  
pp. 17-22 ◽  
Author(s):  
Takahiro NAGATA ◽  
Teruie TAKEMASU ◽  
Takao KOIDE ◽  
Satoshi NISHIDA
Keyword(s):  
Stress Analysis ◽  
Tooth Root ◽  
Bending Stress ◽  
Sintered Steel ◽  
Fem Model

FEM Model for the Tooth Root Bending Stress Analysis of Mating Helical Gears

2000 ◽  
Author(s):  
Giancarlo Ambruosi ◽  
Giuseppe Bianco ◽  
Orazio Della Corte ◽  
Claus-Hermann Lang ◽  
Domenico Paradiso ◽  
...  
Keyword(s):  
Computation Time ◽  
Machining Parameters ◽  
Tooth Root ◽  
Bending Stress ◽  
Fem Model ◽  
Static Tests ◽  
Helical Gears ◽  
Model Size ◽  
Domain Discretization

Abstract The role of simulation in the engineering phase of the product is becoming increasingly important, due to the variety of analysis which can be performed in a shorter time and at reduced costs also identifying weak spots of a component or system, before volume parts have been produced. An FEM model of mating cylindrical helical gears has been developed with the aim of evaluating tooth root bending stress during the engagement. The accurate description of the tooth geometry was provided by an in-house developed software having a direct interface with the FEM pre-processor. This software simulates the manufacturing process, taking into account the geometry of manufacturing tools and the machining parameters. Tooth micro-geometry corrections have been included to better match the real geometry. In the FEM model, the tooth mesh has been optimized in order to reduce the errors due to the domain discretization, in the numerical solution of the contact problem. A non-congruent mesh with special connectivity has been used to minimize the model size and therefore the computation time. The model has been validated by experimental data. Static tests have been performed on innovative test apparatus. The test rig allows the measurement of tooth root bending strains of two mating helical gears engaged in a specified fixed mesh position.

S1120204 Tooth Root Bending Stress Analysis of Face Gears

2015 ◽  
Vol 2015 (0) ◽  
pp. _S1120204--_S1120204-
Author(s):  
Kouji KUMAGAI ◽  
Kunihiko MORIKAWA ◽  
Kenichi SONOWA
Keyword(s):  
Stress Analysis ◽  
Tooth Root ◽  
Bending Stress

Comparative study of stress analysis of gears with different helix angle using the ISO 6336 standard and tooth contact analysis methods

2016 ◽  
Vol 230 (7-8) ◽  
pp. 1350-1358 ◽  
Author(s):  
Layue Zhao ◽  
Robert C Frazer ◽  
Brian Shaw
Keyword(s):  
Stress Analysis ◽  
Contact Stress ◽  
Helix Angle ◽  
Contact Analysis ◽  
Bending Stress ◽  
Contact Ratio ◽  
Tooth Contact Analysis ◽  
Tooth Contact ◽  
Iso Standard ◽  
Analysis Methods

With increasing demand for high speed and high power density gear applications, the need to optimise gears for minimum stress, noise and vibration becomes increasingly important. ISO 6336 contact and bending stress analysis are used to determine the surface load capacity and tooth bending strength but dates back to 1956 and although it is constantly being updated, a review of its performance is sensible. Methods to optimise gear performance include the selection of helix angle and tooth depth to optimise overlap ratio and transverse contact ratio and thus the performance of ISO 6336 and tooth contact analysis methods requires confirmation. This paper reviews the contact and bending stress predicted with four involute gear geometries and proposes recommendations for stress calculations, including a modification to contact ratio factor Zɛ which is used to predict contact stress and revisions to form factor YF and helix angle factor Yβ which are cited to evaluate bending stress. The results suggest that there are some significant deviations in predicted bending and contact stress values between proposal methods and original ISO standard. However, before the ISO standard is changed, the paper recommends that allowable stress numbers published in ISO 6336-5 are reviewed because the mechanisms that initiate bending and contact fatigue have also changed and these require updating.

Viscoelastic Tooth Root Stress Analysis on Fiber Reinforced Thermoplastic Poly-Imide (TPI) Gears

2000 ◽  
Author(s):  
Gong Donghui ◽  
Ichiro Moriwaki ◽  
Kenji Saito
Keyword(s):  
Carbon Fiber ◽  
Stress Analysis ◽  
Power Transmission ◽  
Hysteresis Loss ◽  
Tooth Root ◽  
Fiber Reinforced ◽  
Standard Specimens ◽  
Sufficient Strength ◽  
Root Stress ◽  
Poly Imide

Abstract Although thermoplastic poly-imide (TPI) gears do not have sufficient strength for power transmission, carbon fiber reinforcement greatly improves the strength of TPI gears. Previous experimental research showed that although standard specimens made from carbon fiber reinforced (CFR) TPI has 2.4 times strength in static bending than specimens made from natural TPI, gears made from CFR-TPI yields bending fatigue strength about 10 times greater than gears made from natural TPI. The present paper explains this phenomenon using viscoelastic tooth root stress analysis. The experiments indicated that the natural TPI gears showed much larger viscoelasticity than the CFR-TPI gears. Thus, tooth root stresses were calculated for cases of large and small viscosity moduli. These calculations showed tooth root stress increased with the increase in the viscosity modulus. Also, viscoelasticity may induce heat due to hysteresis loss, and this heat should reduce gear durability. The increase in tooth root stress and the heat due to hysteresis loss must make the durability of the natural TPI gears very small. Therefore, the CFR-TPI can yield much more durable gears than the natural TPI.

scholarly journals Optimization of Tooth Root Profile Using Bezier Curve with G2 Continuity to Reduce Bending Stress of Asymmetric Spur Gear Tooth

2018 ◽  
Vol 237 ◽  
pp. 03010 ◽  
Author(s):  
Priyakant Vaghela ◽  
Jagdish Prajapati
Keyword(s):  
Stress Concentration ◽  
Gear Tooth ◽  
Spur Gear ◽  
Bézier Curve ◽  
Bezier Curve ◽  
Tooth Root ◽  
Geometric Continuity ◽  
Bending Stress ◽  
Gear Design ◽  
G2 Continuity

This research describes simple and innovative approach to reduce bending stress at tooth root of asymmetric spur gear tooth which is desire for improve high load carrying capacity. In gear design at root of tooth circular-filleted is widely used. Blending of the involute profile of tooth and circular fillet creates discontinuity at root of tooth causes stress concentration occurs. In order to minimize stress concentration, geometric continuity of order 2 at the blending of gear tooth plays very important role. Bezier curve is used with geometric continuity of order 2 at tooth root of asymmetric spur gear to reduce bending stress.

scholarly journals Bending stress analysis of a piezoelectric nanoplate with flexoelectricity under inhomogeneous electric fields

AIP Advances ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 055029
Author(s):  
Yan Guo ◽  
Tingfeng Ma ◽  
Ji Wang ◽  
Bin Huang ◽  
Heung Soo Kim
Keyword(s):  
Stress Analysis ◽  
Electric Fields ◽  
Bending Stress
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