scholarly journals DYNAMIC STRUCTURAL ANALYSIS OF ENGINE CRANKSHAFT AT DIFFERENT ANGLE OF CRANK TURNS FOR THREE DIFFERENT MATERIALS

2021 ◽  
Vol 16 (3) ◽  
Author(s):  
Fida Hussain
Keyword(s):  
Cast Iron ◽  
Fatigue Life ◽  
Structural Analysis ◽  
Main Bearing ◽  
Maximum Deformation ◽  
Torsional Load ◽  
Bending Load ◽  
Power Machinery ◽  
Molybdenum Steel ◽  
Engine Crankshaft

For many years, engines have been one of the main power machinery of different kinds of applications, and the main part of power machinery is a crankshaft that converts the piston’s reciprocating displacement with four-link mechanisms into rotary motion. . The major limitation of the engine crankshaft is fatigue failure due to repeated load caused by bending and torsional load. In this paper, the comparative dynamics structural analysis was carried out for three different materials such as forged steel, cast iron, and chromium-molybdenum steel with different angles of turns of cranks from 0° to 720° and to predict the stresses, deformation, and fatigue life of crankshaft without compromising its weight, strength and reliability. The 3D CAD model was simulated with FEA software. The simulated results show that by applying bending load and torsional load for three materials, the maximum stresses produced in the fillet area of the main bearing journal and in the fillet area of the crankpin journal at a crank angle of 360° respectively. The deformation results revealed that maximum deformation occurs at the mid-surface of the crankpin. From fatigue life prediction it was observed that forged steel and chromium-molybdenum steel shows better fatigue life as compared to cast iron. Moreover, in the comparative study, it was concluded that chromium-molybdenum steel shows fewer stresses and better fatigue life. Therefore it is suggested that chromium-molybdenum steel would be the better option for manufacturing crankshaft.

Calculation Error Analysis on the Strain Fatigue Life Predication Formula of Manson-Coffinn and Damage Stain Model

2011 ◽  
Vol 197-198 ◽  
pp. 1599-1603
Author(s):  
Zhen Wei Wang ◽  
Ping An Du ◽  
Ya Ting Yu
Keyword(s):  
Fatigue Life ◽  
Error Analysis ◽  
Fatigue Failure ◽  
High Speed ◽  
Production Cost ◽  
Calculation Error ◽  
Mechanical Components ◽  
Strain Model ◽  
Engine Crankshaft

Mechanical components are subjected heavy alternate load in industries, such as engine crankshaft, wheel axle, etc. The fatigue failure happens after a long work loading, which affects the production cost, safe and time. So the fatigue life predication is fundamental for the mechanical components design. Especially, it is very important for heavy, high-speed machinery. In this paper, both main fatigue life predication formulas are introduced briefly, including Manson-Coffinn formula and Damage strain model. Then, shortages of above life predication formulas are pointed out, and coefficients are explained in detail. Further calculation error analysis is conducted on the basis of experiments on 16 materials. Results show that above life predication formulas lack calculation accuracy. Finally, it is pointed out that coefficients of fatigue life predication formulas are dependent of material performance. So it is unreliable that coefficients are constants for Manson-Coffin and Damage strain model.

scholarly journals Numerical Simulation on Reinforced Concrete Beam with Different Cover Size under Two Point Bending Load

2021 ◽  
Vol 7 (05) ◽  
pp. 39-43
Author(s):  
R Padma Rani & R Harshani
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Structural Analysis ◽  
Concrete Beam ◽  
Failure Modes ◽  
Equivalent Stress ◽  
Reinforced Concrete Beam ◽  
Simulation Software ◽  
Beam Specimen ◽  
Bending Load

Structural analysis is used to assess the behavior of engineering structures under the application of loads. Usually, structural analysis methods include analytical,experimental and numerical methods is used in thisproject, however, only Analytical method is used and the values are taken from literature reference, to get familiar with Finite Element Analysis (FEA) using ANSYS, this is done to acquire practical knowledge about of the effect of the cover. The aim is to identify different failure modes under a range of loading conditions by changing the cover size to get the data of various parameters such as deflection, stress etc. Study of cover helps to observe the stability, reliability and the overall strength of the structural beam. This project attempts made to study the effect of cover on the behavior of reinforced concrete beam. Forthis analytical study, the Reinforced concrete beam specimen of 2000x100x200mm was considered.ANSYS software is a suite of engineering simulation software, based on finite element method, which can solve problems ranging from linear analysis to nonlinear analysis. The Doubly reinforced beams weremodeled by using geometry. In this model,various covers are provided. The beam specimensused in this study were tested under two-point static loading condition until failure of the specimen. From theobtained resultconcluded that the total deformation and directional deformation values are low in 25mm cover compared to other cases but the equivalent stress value is low in 35mm cover size compared to 25mm cover size.

Analysis of Cornering Strength of Steel Wheels Including the Effects of Disc and Rim Interference Assembly

2019 ◽  
Author(s):  
Bin Dang ◽  
Yingchun Shan ◽  
Xiandong Liu ◽  
Xiaoran Wang ◽  
Yue Zhang ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Fatigue Test ◽  
Commercial Vehicle ◽  
Simulation Analysis ◽  
Cyclic Stress ◽  
Stress Variation ◽  
Steel Wheel ◽  
Bending Load ◽  
Simulation Results ◽  
Stress Simulation

Abstract The cornering fatigue test of commercial vehicle steel wheel is modeled and simulated by finite element method in this paper. The influence of interference stress between wheel disc and rim on the simulation results is analyzed. The interference stress is taken as predefined fields to superimpose with the stress generated by the bending load. Then the influence of two different superposition methods defining the interference stress as the average stress and the predefined fields on the stress in dangerous area of the wheel is compared. The results show that the interference stress has a significant effect on the stress state of the wheel and increases the amplitude of symmetric cyclic stress, which directly affects the prediction of fatigue life of the wheel. Therefore, the interference stress must be taken into consideration in the simulation analysis of cornering fatigue test. The influence of different interference stress superposition methods on the stress variation in the dangerous area is obviously different. The method which superimposes interference stress as predefined fields with the stress generated by the bending load is more consistent with the actual assembling and loading process of the wheel. Therefore, this paper provides a reasonable method for the simulation of cornering fatigue test, which can provide more accurate stress simulation results for the prediction of cornering fatigue life of the wheel.

Sign in / Sign up

Export Citation Format

Share Document