Torque and Stress Characteristics of the Skewed-Roller Slipping Clutch Considering Frictional Contact and Dynamic Equilibrium

2014 ◽  
Vol 670-671 ◽  
pp. 784-789
Author(s):  
Ming Feng ◽  
Yong Li
Keyword(s):  
Contact Stress ◽  
Frictional Contact ◽  
Dynamic Equilibrium ◽  
Von Mises Stress ◽  
Relative Rotation ◽  
Stress Distributions ◽  
Surface Contact ◽  
Von Mises

The Skewed–Roller Slipping Clutch (SRSC) produces resistant torque which depends on the relative rotation and sliding between askew arranged cylindrical rollers and specially curved races. In this paper, the surface contact stress and von Mises stress distributions between the dub-off profiled rollers and races are calculated, with consideration given to the frictional contact and dynamic equilibrium of the rollers. The effects of the profiled roller’s parameters on the von Mises stress are investigated and the optimal modification parameters are calculated. In addition, the limiting resistant torque characteristics of the slipping clutch with optimal profiled rollers are discussed in detail.

Stress Analysis of the Skewed-Roller Slipping Clutch Based on Frictional Contact and Dynamic Equilibrium

2011 ◽  
Vol 86 ◽  
pp. 850-853 ◽  
Author(s):  
Ming Feng ◽  
Guang Rong Yan
Keyword(s):  
Stress Concentration ◽  
Frictional Contact ◽  
Power Transmission ◽  
Dynamic Equilibrium ◽  
Von Mises Stress ◽  
Relative Rotation ◽  
Profile Modification ◽  
Roller Profile ◽  
Von Mises ◽  
Reducing Stress

As a novel power transmission component, the skewed–roller slipping clutch (SRSC) produces resisting torque depending on relative rotation and sliding between askew arranged cylindrical rollers and specially curved races. In this paper, the surface contact stress and von Mises stress between the rollers and the races are calculated and the effects of roller profile modification on reducing stress concentration are investigated under frictional contact and dynamic equilibrium of the rollers and races.

The effect of proximity of a rail end in elastic-plastic contact between a wheel and a rail

2003 ◽  
Vol 217 (3) ◽  
pp. 189-201 ◽  
Author(s):  
Y. C. Chen
Keyword(s):  
Contact Stress ◽  
Contact Point ◽  
Plastic Zone Size ◽  
Von Mises Stress ◽  
Stress Distributions ◽  
Elastic Plastic ◽  
Contact Points ◽  
Contact Distance ◽  
Von Mises ◽  
Strain Model

This paper investigates the effects of a free rail end on the contact stress distribution near the rail end by employing elastic-plastic finite element methods. The contact elements were used to simulate the interaction between a wheel and a rail. A plane strain model was used in this study. Variations in contact stress fields at various contact points near the rail end were compared. The availability of the Hertz contact theory in the region near the rail end was also investigated. The numerical results indicated that the contact stress distributions around the rail end are sensitive to the contact distance. The location of the maximum von Mises stress was shifted to the contact surface as the contact point moves close to the rail end. Results also show that the plastic zone size and the von Mises stress are increased gradually and extend to the rail end as the contact point moves near the rail end. A higher stress, larger deflection and serious plastic deformation occurring at the rail end may lead to deterioration and delamination at the rail end.

Investigation on stress distribution and pressure capacity of two-layer split high-pressure die based on finite element analysis

2019 ◽  
Vol 233 (14) ◽  
pp. 5048-5055
Author(s):  
Z Yi ◽  
WZ Fu ◽  
MZ Li
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
High Pressure ◽  
Stress State ◽  
Von Mises Stress ◽  
Stress Distributions ◽  
Element Analysis ◽  
Round Cylinder ◽  
Von Mises ◽  
Supporting Ring

In order to obtain a higher pressure capacity for the high-pressure die with a larger sample cavity, two types of two-layer split dies with a round cylinder and a quadrate cylinder were designed based on the conventional belt-type die. Finite element analysis was performed to investigate the stress distributions and pressure capacities of the high-pressure dies using a derived Mohr–Coulomb criterion and the von Mises criterion for the cylinder and supporting rings, respectively. As predicted by the finite element analysis results, in the two-layer split dies with a round cylinder, the stress state of the cylinder can be only slightly improved; and the von Mises stress of the first layer supporting ring can be hardly decreased. However, in the two-layer split dies with a quadrate cylinder and sample cavity, the stress state of the cylinder can be remarkably improved. Simultaneously, the von Mises stress of the supporting rings, especially for the first-layer supporting ring, can be also effectively decreased. The pressure capacities of the two-layer split dies with a round cylinder and a quadrate cylinder are 16.5% and 63.9% higher with respect to the conventional belt-type die.

scholarly journals Effect of Fiber Posts on Stress Distribution of Endodontically Treated Upper Premolars: Finite Element Analysis

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1708 ◽  
Author(s):  
Maciej Zarow ◽  
Mirco Vadini ◽  
Agnieszka Chojnacka-Brozek ◽  
Katarzyna Szczeklik ◽  
Grzegorz Milewski ◽  
...  
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Resin Composite ◽  
Von Mises Stress ◽  
Stress Distributions ◽  
Stress Concentrations ◽  
Element Analysis ◽  
Endodontically Treated Tooth ◽  
Maxillary Premolars ◽  
Von Mises

By means of a finite element method (FEM), the present study evaluated the effect of fiber post (FP) placement on the stress distribution occurring in endodontically treated upper first premolars (UFPs) with mesial–occlusal–distal (MOD) nanohybrid composite restorations under subcritical static load. FEM models were created to simulate four different clinical situations involving endodontically treated UFPs with MOD cavities restored with one of the following: composite resin; composite and one FP in the palatal root; composite and one FP in the buccal root; or composite and two FPs. As control, the model of an intact UFP was included. A simulated load of 150 N was applied. Stress distribution was observed on each model surface, on the mid buccal–palatal plane, and on two horizontal planes (at cervical and root-furcation levels); the maximum Von Mises stress values were calculated. All analyses were replicated three times, using the mechanical parameters from three different nanohybrid resin composite restorative materials. In the presence of FPs, the maximum stress values recorded on dentin (in cervical and root-furcation areas) appeared slightly reduced, compared to the endodontically treated tooth restored with no post; in the same areas, the overall Von Mises maps revealed more favorable stress distributions. FPs in maxillary premolars with MOD cavities can lead to a positive redistribution of potentially dangerous stress concentrations away from the cervical and the root-furcation dentin.

Design and Analysis on a Kind of Oblique-Cone-Slid-Ring Assembly Seal Device with Self-Compensation to Seal Wear in Carbide Actor

2010 ◽  
Vol 43 ◽  
pp. 247-252 ◽  
Author(s):  
Yong Hu ◽  
Wei Yan ◽  
Hua Bing Wen ◽  
Chuan Shun Wen
Keyword(s):  
Work Stress ◽  
Contact Stress ◽  
Von Mises Stress ◽  
Thickness Variation ◽  
Ansys Software ◽  
Ring Assembly ◽  
Spring Force ◽  
User Demand ◽  
Von Mises ◽  
Oblique Cone

We design and analyze a kind of oblique-cone-slid-ring (OCSR) assembly seal device used in carbide actor that can self-compensate the seal wear. The effect of the OCSR thickness variation on the contact stress, Von mises stress, and spring force is analyzed using ANSYS software. It shows that the OCSR assembly seal device can seal well and has the function of self-compensation to seal wear when the OCSR thickness vary during the experiment conditions given. The max contact stress on the seal surface and other contact face is higher or much higher than the work stress of sealed medium. That means the design is satisfied with the user demand. The results provide a theoretical base for the further study and applications of the OCSR assembly seal device.

Elastic Analysis of Journal Bearings

Volume 1 ◽  
2004 ◽  
Author(s):  
M. M. Villar ◽  
M. M. Pe´rez
Keyword(s):  
Stress Distribution ◽  
General Purpose ◽  
Von Mises Stress ◽  
Elastic Analysis ◽  
Stress Distributions ◽  
Finite Element Program ◽  
Relative Significance ◽  
Element Program ◽  
Von Mises ◽  
Hoop Stresses

In this paper a numerical model is used to investigate the effect of the elasticity of the bearing in the pressure distribution in the lubricant and the stress distribution in the bearing. The lubricant film, as well as a bearing, including the lining and the backing of the insert, and the housing, are modeled using the general-purpose ANSYS®5.7 commercial Finite Element program. Results have been obtained for the pressure, radial displacement, hoop and von Mises stress distributions at the surface of the bearing, as well as for the shear stress distribution at the interface between the lining and the backing. A number of conclusions have been drawn regarding the relative significance of the steep pressure gradient at the end of the lubricated region on the hoop stresses that cause localized bending distortions at the surface of the lining. These localized bending distortions, in turn, are likely to cause fatigue failure of the lining.

Numerical Study on Elastic-Plastic Stress Field Near the Cooling Holes of Nickel-Based Single Crystal Air-Cooled Blades

2006 ◽  
Vol 324-325 ◽  
pp. 563-566 ◽  
Author(s):  
Qing Min Yu ◽  
Zhu Feng Yue ◽  
Yong Shou Liu
Keyword(s):  
Shear Stress ◽  
Stress Field ◽  
Numerical Study ◽  
Von Mises Stress ◽  
Shear Stresses ◽  
Slip Systems ◽  
Stress Distributions ◽  
Elastic Plastic ◽  
Von Mises ◽  
Plastic Stress

In this paper, a plate containing a central hole was used to simulate gas turbine blade with cooling hole. Numerical calculations based on crystal plasticity theory have been performed to study the elastic-plastic stress field near the hole under tension. Two crystallographic orientations [001] and [111] were considered. The distributions of resolved shear stresses and strains of the octahedral slip systems {110}<112> were calculated. The results show that the crystallographic orientation has remarkable influence on both von Mises stress and resolved shear stress distributions. The resolved shear stress distributions around the hole are different between the two orientations, which lead to the different activated slip systems. So the deformed shape of the hole in [001] orientation differs from that in [111] orientation.

Experimental Study and Finite Element Analysis of the Performance of Reciprocating Seal in Rapping Device of Gasifier

2010 ◽  
Vol 42 ◽  
pp. 48-53
Author(s):  
Jiu Yang Yu ◽  
Jiu Yang Gao ◽  
Wei Lin ◽  
Cheng Gang Wang ◽  
Yan Yang Wu ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Experimental Study ◽  
Finite Element ◽  
Contact Stress ◽  
Power Loss ◽  
Von Mises Stress ◽  
Seal Ring ◽  
Element Analysis ◽  
Von Mises

The performance of reciprocating seals in rapping device of gasifier was studied through finite element method. The contact stress, Von-Mises stress, and friction power loss of O-ring and Sliding-ring combined Seal-ring were obtained. Meanwhile, the experimental study in performance of seal structures of rapping device were carried out. The results show that both of the seal structures are satisfied seal requirement, but compared with the Sliding-ring combined Seal-ring, the O-ring is easier to be destroyed and power loss of O-ring is higher than Sliding-ring combined Seal-ring. The results also verify the superiority of Sliding-ring combined Seal-ring in rapping device of gasifier.

Falling Simulation of Free-Standing Museum Cultural Relics Supported by Soft Pad

2014 ◽  
Vol 670-671 ◽  
pp. 715-719
Author(s):  
Qian Zhou
Keyword(s):  
Material Properties ◽  
Element Model ◽  
Von Mises Stress ◽  
Stress Distributions ◽  
Acceleration Response ◽  
Response Curves ◽  
Free Standing ◽  
Cultural Relic ◽  
Von Mises ◽  
Cultural Relics

Free-standing museum cultural relics are easy to fall off exhibition booth and get damaged under earthquakes. To find an effective method to mitigate damage of cultural relics due to fall off, influences of soft pad under relic was studied by ANSYS/LS-DYNA program. A bronze relic supported by a soft pad was selected for analysis. Based on material properties of both the relic and the pad, finite element model of the relic was built. By simulation, Von mises stress distributions, acceleration response curves as well as kinetic energy curves of the relic were obtained; effects of the soft pad to mitigate damage of the relic were discussed. Results show that collision between the falling museum cultural relic and ground can be mitigated by soft pad due to its buffer as well as energy absorption effects. It is suggested to use soft pad under relic to provide protection. Besides, by ANSYS/LS-DYNA program, falling off process of free-standing museum cultural relics can be effectively simulated.

Boule Shape Dependence of Shear and von-Mises Stress Distributions in Bulk SiC during Sublimation Growth

2010 ◽  
Vol 1246 ◽  
Author(s):  
Roman Victorovich Drachev ◽  
Darren Hansen ◽  
Mark J Loboda
Keyword(s):  
Shear Stress ◽  
Thermal Conditions ◽  
Side Surface ◽  
Growth Front ◽  
Growth Conditions ◽  
Von Mises Stress ◽  
Stress Distributions ◽  
Reaction Cell ◽  
Small Seed ◽  
Von Mises

AbstractAn analytical study of the dependence of shear and von-Mises stress distributions, which develop during PVT (Physical Vapor Transport) growth of 4H-SiC, has been executed. The key parameters investigated include thermal conditions of the crystal growth and parameters of the growing boule geometry. The evaluation was conducted via a 24 full factorial DOE (Design of Experiments). Parameters of the growing boule geometry, i.e. seed diameter, growth front height, inclination angle and height of the side surface were set as the DOE factors, while responses were calculated using numerical simulations. It is found that unique SiC boule growth conditions, which simultaneously minimize both the shear stress and von Mises stress magnitudes, cannot be achieved. Optimization of the shear stress distribution favors longer SiC boules with small seed diameters, small expansion angles and flat growth fronts. Alternatively, optimization of von-Mises stress favors short crystals with small seed diameters and small expansion angles but with curved growth fronts. Consequently, optimization of stress components in SiC crystals involves careful investigation of the interaction and compromise of the reaction cell geometry and growth conditions.

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