scholarly journals Determination of the optimal coverage for heavy-duty-axle gears in shot peening

2021 ◽  
Author(s):  
Hongzhi Yan ◽  
Pengfei Zhu ◽  
Zhi Chen ◽  
Hui Zhang ◽  
Yin Zhang ◽  
...  
Keyword(s):  
Shot Peening ◽  
Heavy Duty

scholarly journals Determination of the Optimal Coverage for Heavy-Duty-Axle Gears in Shot Peening

2021 ◽  
Author(s):  
Hongzhi Yan ◽  
Pengfei Zhu ◽  
Zhi Chen ◽  
Hui Zhang ◽  
Yin Zhang ◽  
...  
Keyword(s):  
Residual Stress ◽  
Surface Roughness ◽  
Dislocation Density ◽  
Shot Peening ◽  
Compressive Residual Stress ◽  
Heavy Duty ◽  
High Coverage ◽  
Service Lifetime ◽  
Maximum Value

Abstract Pitting and wear often appear on heavy-duty-axle gears due to their harsh working conditions, such as high torques, high loads and poor lubrication. Shot peening is a popular surface strengthening method for gears. In order to ensure complete coverage during shot peening, 100%~200% coverage is usually prescribed for most gears. However, it is difficult to effectively improve the contact fatigue and wear resistance of heavy-duty-axle gears. Generally, increasing shot peening coverage can heighten the compressive residual stress for prolonging the service lifetime of gears. Whereas, high coverage levels may cause the deterioration of surface roughness, thus increase the noise and vibration of gears. To address this issue, this paper deals with the determination of optimal coverage for heavy-duty-axle gears by experimental tests. The influence of shot peening coverage on the surface integrity of gears is analyzed in terms of residual stress, microhardness, surface morphology and dislocation density. The results show that the maximum compressive residual stress increases first and then keeps stable with the increase of coverage, and the maximum value is −1172.10 MPa. The microhardness peak increases obviously in the beginning and then slowly rises with the increase of coverage, and the maximum value is 747.5 HV1.0. The surface roughness (Ra) decreases initially and then enhances with the increase of coverage, and the minimum value is 0.99 μm under the coverage of 1000%. The dislocation density increases with the increase of coverage, and the maximum value is 3.70×1016 m-2. Numerous damages (microscalings, spallings) occur on the treated gear tooth flank affecting the residual stress distribution and roughness under high coverage levels. Taking into consideration of service lifetime, working noise and economic efficiency, the coverage of 1000% is the optimal coverage for heavy-duty-axle gears in shot peening.

Device for the Determination of Impact Velocities in Shot Peening

Shot Peening ◽  
2006 ◽  
pp. 89-95
Author(s):  
Rolf Clausen ◽  
Jürgen Stangenberg
Keyword(s):  
Shot Peening

Investigation of Failures in Gas Turbines: Part 1 — Techniques and Principles of Failure Investigation

1993 ◽  
Author(s):  
Robert E. Dundas
Keyword(s):  
Gas Turbines ◽  
Heavy Duty ◽  
Case Histories ◽  
Logical Approach ◽  
Failure Investigation ◽  
Industrial Gas Turbines ◽  
The One ◽  
Aircraft Accident

This paper is Part 1 of a two-part paper on the principles and methods of failure investigation in gas turbines. The qualities of a successful failure investigator are presented, and the most efficacious approaches to an investigation are discussed. An example of an aircraft accident that might have been avoided is used to support the necessity for thorough and conclusive investigations into failures. Two case histories involving heavy-duty industrial gas turbines are described to demonstrate different aspects of the logical approach to construction of hypotheses and the determination of the essential cause of a failure — the one event without which the failure would not have occurred.

Process Optimization of Ultrasonic Shot Peening by Realistic Modeling of Beads Motion

2014 ◽  
Author(s):  
Alexandre Brosse ◽  
Simon Le Moal ◽  
Rémi Lacroix ◽  
Philippe Mourgue ◽  
Vincent Robin ◽  
...  
Keyword(s):  
Numerical Model ◽  
Shot Peening ◽  
High Frequency ◽  
High Speed ◽  
Nuclear Industry ◽  
Input Frequency ◽  
Realistic Modeling ◽  
Ultrasonic Shot Peening ◽  
Small Steel

In the nuclear industry surface mechanical treatments are used in order to improve the surface integrity of the component, which increases their lifetime regarding corrosion and fatigue damages. A good understanding of these processes and their consequences is required to ensure the efficiency and perpetuity of such mitigation treatment. This study focuses on the ultrasonic shot peening process. It consists in shooting at high speed small steel beads on the part to be treated by using a high frequency vibration device. Parameters such as the number and the size of beads, the input frequency and the dimensions of the chamber can induce large ranges of impact velocity and coverage. In order to help manufacturers to control the treatment applied on their components, a numerical model has been developed. It accounts for the shocks of the beads against the walls of the chamber, the peening head and between beads, describing their motions accurately. In this paper, we will introduce the numerical model developed to simulate the motions of beads in the peening chamber. Special attention will be taken to the determination of the restitution rates related to the different materials. Results of the model will be shown for different process parameter (e.g. the number of beads), and a thorough analysis of their effects on the workpiece will be presented, including a comparison with some experimental results.

Assessment of the Crack Compliance Method and the Introduction of Residual Stresses by Shot Peening Using the Finite Element Method

2009 ◽  
Vol 15 ◽  
pp. 109-114 ◽  
Author(s):  
G. Urriolagoitia-Sosa ◽  
E. Zaldivar-González ◽  
J.M. Sandoval Pineda ◽  
J. García-Lira
Keyword(s):  
Numerical Simulation ◽  
Residual Stress ◽  
Stress Field ◽  
Residual Stresses ◽  
Shot Peening ◽  
Working Life ◽  
The Finite Element Method ◽  
Residual Stress Field ◽  
Main Effect

The interest on the application of the shot peening process to arrest and/or delay crack growth is rising. The main effect of the shot peening technique is to introduce a residual stress field that increases the working life of mechanical components. In this paper, it is presented the numerical simulation (FEM) of the shot peening process and the effect of introducing a residual stress field. Besides, the consequence of changing the sizes of the impacting ball is analyzed. This work also used the Crack Compliance Method (CCM) for the determination of residual stresses in beams subjected to a numerical simulation of a shot peening process. The numerical results obtained provide a quantitative demonstration of the effect of shot peening on the introduction of residual stresses by using different sizes of impacting balls and assess the efficiency of the CCM.

Effect of Shot Peening and NiAl Coating on Fatigue Limit of Mg-Al-Zn-Mn Alloy

2011 ◽  
Vol 56 (3) ◽  
pp. 743-748 ◽  
Author(s):  
P. Mrva ◽  
D. Kottfer ◽  
Ł. Kaczmarek
Keyword(s):  
Fatigue Limit ◽  
Shot Peening ◽  
Thermal Spraying ◽  
Analytical Determination ◽  
Standard Measurement

Effect of Shot Peening and NiAl Coating on Fatigue Limit of Mg-Al-Zn-Mn Alloy The paper deals with an influence of cylic load on fatigue limit of the Mg-Al-Zn-Mn alloy without or with the NiAl coating. The fatigue limit was determined for the following three types of specimens of the Mg-Al-Zn-Mn alloy: (1) fine-turned specimens; (2) fine-turned specimens with an application of the shot peening process; (3) fine-turned and shot-peened specimens with the NiAl coating deposited by the thermal spraying technique. A standard measurement of the fatigue limit was used for the analytical determination of the Wohler curves (S-N curves). The Wohler curves for the specimens (1) and (3) were in agreement with those presented in literature. The specimens (2) exhibited a lower value of the fatigue limit compared with that of the specimens (1), although the increase of the fatigue limit of the specimens (2) was expected due to the presence of the application of the shot peening process. An analysis of reasons of the decrease of the fatigue limit of the specimens (2) is presented.

Method for the Determination of the Composition of Diesel Engine Piston Deposits by Infrared Spectroscopy

1997 ◽  
Vol 51 (6) ◽  
pp. 827-835 ◽  
Author(s):  
H. F. Shurvell ◽  
A. D. H. Clague ◽  
M. C. Southby
Keyword(s):  
Infrared Spectroscopy ◽  
Diesel Engine ◽  
Chemical Information ◽  
Heavy Duty ◽  
Engine Piston ◽  
Heavy Duty Diesel Engine ◽  
Heavy Duty Diesel ◽  
Inorganic Components ◽  
Detailed Chemical

A chemical method for separating diesel engine piston deposits into various organic and inorganic components is described. The components are subsequently analyzed by infrared spectroscopy. The method is illustrated with examples of deposits removed from the upper lands and upper ring grooves of pistons taken from heavy-duty diesel engine tests. Subtle chemical differences were observed between two deposits removed from upper lands of pistons taken from diesel engine tests which had been carried out with the use of lubricating oils with different formulations. More obvious differences were found between the deposits taken from the upper land areas and the upper ring grooves. These results indicate that a combined chemical and spectroscopic approach has the potential to provide detailed chemical information about engine deposits.

Sign in / Sign up

Export Citation Format

Share Document