Large Pendulum Shaft Failure Analysis and Countermeasure Research

2012 ◽  
Vol 605-607 ◽  
pp. 756-759
Author(s):  
Wei Ming Lin ◽  
Yong Zhang ◽  
Hui Yu Xiang ◽  
Zhe Li
Keyword(s):  
Finite Element ◽  
Fatigue Strength ◽  
Failure Analysis ◽  
Safety Factor ◽  
Drive System ◽  
Drive Shaft ◽  
Output Shaft ◽  
Countermeasure Research ◽  
Finite Element Software ◽  
Shaft Failure

With respect to the failure of drive shaft of a large pendulum, a finite element software is used to analyze its stress. The results indicate that the failure is caused by inadequate design of the fatigue strength of the output shaft. Chamfer is the main reason for changing the fatigue strength safety factor, in addition, the drive system may also cause the stress of output shaft too large. At last, specific equipment improvements and shaft failure countermeasures is put forward.

scholarly journals Stability Analysis of Ecological Slopes Based on a 3D Finite Element Model

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
ZiFan Sui ◽  
Weijia Yuan ◽  
Wen Yi ◽  
Weihuan Yang
Keyword(s):  
Finite Element ◽  
Root System ◽  
Safety Factor ◽  
Cynodon Dactylon ◽  
Plant Protection ◽  
Lateral Roots ◽  
Plant Distribution ◽  
Plant Roots ◽  
Research Subjects ◽  
Finite Element Software

To explore the effect of grass and shrub plant roots on the stability of soil slopes in rainy areas in the south, this article relies on the Longlang Expressway construction project. Cynodon dactylon and Magnolia multiflora were selected as research subjects. The plant distribution characteristics and mechanical properties are analyzed. This paper uses ABAQUS finite element software to construct a 3D model of the planted slope in the test section. The stress and strain on the root system and the soil were observed, and the variation law of slope stability before and after plant protection under different rainfall events was compared and analyzed. The test and simulation results show that the root content of Cynodon dactylon gradually decreases with increasing depth. Cynodon dactylon was mainly distributed in the 0–30 cm soil body, and its effect on improving the cohesion of the soil body reached 75%. Magnolia multiflora belongs to vertical roots and has a strong and longer main root with relatively developed lateral roots. Its root system passes through the sliding surface of the slope bottom, which reduces the maximum equivalent plastic stress generated inside the slope by 61%. When the total rainfall duration is unchanged, under the three rainfall intensities of small, medium, and large, herbaceous plants increase the safety factor of the soil by 1.33%, 2.08%, and 6.1%, respectively, and the roots of shrubs increase the safety factor of the soil by 3.29%, 4.08%, and 4.32%, respectively. When the rainfall intensity does not change, as the rainfall time increases, the effect of plants on the slope safety factor first gradually increases and eventually stabilizes. The research results provide a reliable theoretical basis for analyzing the effect of plant roots on soil consolidation and slope protection, and they also lay a technical foundation for the promotion and application of ecological slope protection technology.

Based on Analysis of Finite Element Analysis of Automobile Transmission Shaft Comprehensive Optimization

2014 ◽  
Vol 684 ◽  
pp. 341-346
Author(s):  
Heng Yi Yuan
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Finite Element Model ◽  
High Speed ◽  
Ride Comfort ◽  
Element Model ◽  
Drive Shaft ◽  
Element Analysis ◽  
Finite Element Software ◽  
Transmission Shaft

The shaft as an important parts of automobile transmission system, in the process of the car have the effect of rotational speed and torque. Due to the structural characteristics of its low frequency, small stiffness, universal joint, such as the existence of the additional moment drive shaft inevitably exist when high speed vibration phenomenon. So the shaft vibration problems to deal with the vehicle ride comfort, comfort and dynamic performance has important significance. On the basis of the finite element software ANSYS, the physical design of drive shaft. Analyzes the mapping grid finite element model of transmission shaft, facilitate accurate transmission shaft strength calculation. Based on the inherent frequency and vibration model of finite element method to calculate transmission shaft, using experimental modal technology for modal analysis of the shaft, the test results verify the reliability of the finite element model. On this basis, the drive shaft assembly constraint modal finite element analysis, can be used as the basis of further research.

The Modal Analysis of the Ceramic Ball’s Rolling Contact Fatigue Tester’s Drive Shaft

2012 ◽  
Vol 503-504 ◽  
pp. 1029-1032
Author(s):  
Jing Ling Zhou ◽  
Wei Ming Zuo ◽  
Yu Jing Li ◽  
Yu Song Ren ◽  
Wei Nan Zhu
Keyword(s):  
Finite Element ◽  
Fatigue Life ◽  
Modal Analysis ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Drive Shaft ◽  
Test Rig ◽  
Finite Element Software ◽  
Contact Fatigue Life

The Modal Analysis of the Ceramic Ball Rolling Contact Fatigue Life Test Rig Drive Shaft Abstract: With the increasing of the rolling contact fatigue life tester’s speed, the vibration problem is getting more and more serious. In order to optimize the dynamic performance test rig, the modal analysis of the drive shaft was carried. First the vibration mechanics model was got by simplifying the shaft and get the first order of horizontal natural frequency which is 787.4266Hz with the theoretic algorithm. Then the drive shaft’s modal analysis was made by using the finite element software and that is 779Hz. The relative error between the former and the latter is 1.1%. It has demonstrated the accuracy of the finite element result, and its modal analysis could be the basis of the dynamic optimization.

scholarly journals Pinion Failure Analysis of a Helical Reduction Gearbox in a Kraft Process

2020 ◽  
Vol 10 (8) ◽  
pp. 2935
Author(s):  
Deepak K. Pandey ◽  
Hee-Chang Lim
Keyword(s):  
Finite Element Analysis ◽  
Plastic Deformation ◽  
Finite Element ◽  
Failure Analysis ◽  
Safety Factor ◽  
Design Methodology ◽  
Element Analysis ◽  
Axial Thrust ◽  
Kraft Process ◽  
Surface Fatigue

This paper reports investigations related to addressing the cause of pinion teeth deformation of a helical reduction gearbox in a kraft process. The American Gear Manufacturers Association (AGMA) design methodology was employed to determine the safety factor under bending and surface fatigue strengths of a pinion and gear at two operating loads (3 and 3.75 MW). In addition, finite element analysis (FEA) of the pinion and gear assembly was also performed to check the misalignment (due to deformation) at 3.75 MW load. Based on the investigations presented herein, it is found that the pinion portion near the thrust disc became excessively deformed at the axial thrust corresponding to the 3.75 MW load, causing misalignment that resulted in the plastic deformation of the pinion teeth.

scholarly journals Sensitivity of Multistage Fill Slope Based on Finite Element Model

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Bingxiang Yuan ◽  
Zihao Li ◽  
Zhilei Su ◽  
Qingzi Luo ◽  
Minjie Chen ◽  
...  
Keyword(s):  
Sensitivity Analysis ◽  
Finite Element ◽  
Internal Friction ◽  
Safety Factor ◽  
Friction Angle ◽  
Internal Friction Angle ◽  
Sliding Surface ◽  
Finite Element Software ◽  
The Stability ◽  
Fill Slope

Based on the strength reduction method, the laws of slope displacement and the changing positions of the sliding surface during the filling process are studied. The model of multistage fill slope is established by the finite element software PLAXIS. The difference is compared between the slope with no reinforcement and with reinforcement under the same working condition. Sensitivity analysis is carried out from two aspects which are internal factors and external factors. The finite element analysis shows that the settlement of the multistage fill slope with no reinforcement is mainly concentrated on the right side of the slope and gradually decreases with the increase of the filling height. The position of the sliding outlet is located at the joint of the first and the second grade of the slope. The effect of the reinforcement on the sliding surface is ideal. It is obvious that the reinforcement can supply the slope with a better position of the sliding surface, which is beneficial to the stability of the slope. The sensitivity analysis shows that unit weight, ratio of slope, and height of each grade are negatively correlated with the safety factor. At the same time, the platform width, cohesion, and internal friction angle are positively correlated with the safety factor. The internal friction angle has the greatest influence on the stability of the slope. Besides, the platform width and the height of each grade should be controlled at about 4 m. The sensitivity analysis provides a reference for the design of the multistage filling slope.

Finite Element Analysis on High Embankment of Widened Road

2011 ◽  
Vol 63-64 ◽  
pp. 770-774 ◽  
Author(s):  
Cheng Zhong Yang ◽  
Wen Jie Wan
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Safety Factor ◽  
Factor Of Safety ◽  
Conversion Coefficient ◽  
Yield Criterion ◽  
Strength Reduction ◽  
Finite Element Software ◽  
True Value ◽  
Element Method

By means of finite element method software simulation analysis, using strength reduction finite element method analyse factor of safety of embankments. Nowadays most finite element program is analyzed in the perfect elasto-plastic with the Mohr-Coulomb not equiangular hexagon circumcircle Drucker-Prager yield criterion, it have margin of error with not equiangular hexagon in π-plane, so we use Mohr-Coulomb equivalent area circle D-P yield criterion instead of it. Calculate conversion coefficient of two safety factor under different yield criterion. Using safety factor through finite element software by strength reduction multiply by conversion coefficient, get new safety factor. Through the example of high embankment of old road widened in Shanghai-Chengdu expressway Hejiaping cable section K2+ 710~890, validation of this method calculated the accuracy of the safety factor, the results show that the new factor of safety closer to the true value.

The Elastoplastic Finite Element Analysis for the Deep Anti-Sliding Stability of Gravity Dam by the Method of Overloading

2015 ◽  
Vol 1089 ◽  
pp. 270-276
Author(s):  
Jun Rui Pang ◽  
Wei Sun ◽  
Gang Wang ◽  
Long Su
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Safety Factor ◽  
Horizontal Displacement ◽  
Gravity Dam ◽  
Element Analysis ◽  
Dam Foundation ◽  
Finite Element Software ◽  
Sliding Stability ◽  
Foundation Rock

Combined with engineering requirements of the Qingyu reservoir, the ANSYS finite element software was used to establish an elastoplastic gravity dam calculation model which considered the mechanical properties of weak structural plane of rock in the dam foundation. An analysis based on not only the finite element iteration not converging,the plastic zones in dam foundation rock developing to through the foundation and the mutation in horizontal displacement of feature points, but also the discontinuous variation of the distribution of horizontal displacement of dam foundation rock, the dislocation between the above and below of weak layers and the leap of iterations were took as the criterions to get the deep anti-sliding stability safety factor of gravity dam by gradually increasing the load burdened on the upstream face of the dam. This thesis illustrated the principle of the elastoplastic finite element analysis for the deep stability of gravity dam by the method of overloading, demonstrated the feasibility of this method ,expanded the criterions to determine the safety factor and obtains the safety factor of this practical engineering under the elastoplastic overloading method.

scholarly journals Low-Cycle Fatigue Crack Initiation Simulation and Life Prediction of Powder Superalloy Considering Inclusion-Matrix Interface Debonding

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4018
Author(s):  
Shuming Zhang ◽  
Yuanming Xu ◽  
Hao Fu ◽  
Yaowei Wen ◽  
Yibing Wang ◽  
...  
Keyword(s):  
Finite Element ◽  
Crack Initiation ◽  
Life Prediction ◽  
Damage Mechanics ◽  
Low Cycle Fatigue ◽  
Fatigue Crack Initiation ◽  
Fatigue Loading ◽  
Interface Debonding ◽  
Damage Evolution Equation ◽  
Finite Element Software

From the perspective of damage mechanics, the damage parameters were introduced as the characterizing quantity of the decrease in the mechanical properties of powder superalloy material FGH96 under fatigue loading. By deriving a damage evolution equation, a fatigue life prediction model of powder superalloy containing inclusions was constructed based on damage mechanics. The specimens containing elliptical subsurface inclusions and semielliptical surface inclusions were considered. The CONTA172 and TARGE169 elements of finite element software (ANSYS) were used to simulate the interfacial debonding between the inclusions and matrix, and the interface crack initiation life was calculated. Through finite element modeling, the stress field evolution during the interface debonding was traced by simulation. Finally, the effect of the position and shape size of inclusions on interface debonding was explored.

Effect of crack on free vibration of a pre-stressed curved plate

2021 ◽  
pp. 095440622199486
Author(s):  
Can Gonenli ◽  
Hasan Ozturk ◽  
Oguzhan Das
Keyword(s):  
Finite Element ◽  
Free Vibration ◽  
Natural Frequency ◽  
Present Model ◽  
Mode Shapes ◽  
Load Parameter ◽  
Flexible Plate ◽  
Cantilever Plate ◽  
Finite Element Software ◽  
Aspect Ratios

In this study, the effect of crack on free vibration of a large deflected cantilever plate, which forms the case of a pre-stressed curved plate, is investigated. A distributed load is applied at the free edge of a thin cantilever plate. Then, the loading edge of the deflected plate is fixed to obtain a pre-stressed curved plate. The large deflection equation provides the non - linear deflection curve of the large deflected flexible plate. The thin curved plate is modeled by using the finite element method with a four-node quadrilateral element. Three different aspect ratios are used to examine the effect of crack. The effect of crack and its location on the natural frequency parameter is given in tables and graphs. Also, the natural frequency parameters of the present model are compared with the finite element software results to verify the reliability and validity of the present model. This study shows that the different mode shapes are occurred due to the change of load parameter, and these different mode shapes cause a change in the effect of crack.

Numerical solutions for strain-softening surrounding rock under three-dimensional principal stress condition

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Sheng Yu-ming ◽  
Li Chao ◽  
Xia Ming-yao ◽  
Zou Jin-feng
Keyword(s):  
Finite Element ◽  
Principal Stress ◽  
Stress Condition ◽  
Strain Softening ◽  
Numerical Solutions ◽  
Three Dimensional ◽  
Strength Criterion ◽  
Surrounding Rock ◽  
Flow Rule ◽  
Finite Element Software

Abstract In this study, elastoplastic model for the surrounding rock of axisymmetric circular tunnel is investigated under three-dimensional (3D) principal stress states. Novel numerical solutions for strain-softening surrounding rock were first proposed based on the modified 3D Hoek–Brown criterion and the associated flow rule. Under a 3D axisymmetric coordinate system, the distributions for stresses and displacement can be effectively determined on the basis of the redeveloped stress increment approach. The modified 3D Hoek–Brown strength criterion is also embedded into finite element software to characterize the yielding state of surrounding rock based on the modified yield surface and stress renewal algorithm. The Euler implicit constitutive integral algorithm and the consistent tangent stiffness matrix are reconstructed in terms of the 3D Hoek–Brown strength criterion. Therefore, the numerical solutions and finite element method (FEM) models for the deep buried tunnel under 3D principal stress condition are presented, so that the stability analysis of surrounding rock can be conducted in a direct and convenient way. The reliability of the proposed solutions was verified by comparison of the principal stresses obtained by the developed numerical approach and FEM model. From a practical point of view, the proposed approach can also be applied for the determination of ground response curve of the tunnel, which shows a satisfying accuracy compared with the measuring data.

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