scholarly journals Assessment of the Impact of Shot Peening on the Fatigue Life of a Compressor Blade Subjected to Resonance Vibrations

2020 ◽  
Author(s):  
Arkadiusz Bednarz ◽  
Wojciech Misiołek
Keyword(s):  
Fatigue Life ◽  
Shot Peening ◽  
Geometric Model ◽  
Fatigue Analysis ◽  
Compressor Blade ◽  
Resonant Vibrations ◽  
Equivalent Stresses ◽  
Resonance Vibrations ◽  
The Impact ◽  
The Relationship

The publication presents the assessment of the influence of surface treatment such as shot-peening on the fatigue life of a compressor blade exposed to resonant vibrations. As part of the work, a geometric model of the blade was developed and a numerical modal and fatigue analysis were performed. The fatigue analysis was based on the Manson-Coffin-Basquin and Ramberg-Osgood models. As part of the work, the influence of different values of residual stresses on the results of fatigue life was determined. Additionally, the location of the highest equivalent stresses was established. The obtained results of the numerical analyzes were compared with the results presented in the scientific literature. An additional aim of the study was to determine the size of the grains at various points of the blade as well as the thickness of the layer plasticized as a result of peening. The obtained results are presented in the form of tables and charts. The relationship between the location of the highest values of equivalent stresses and the thickness of the plasticized layer was determined. The explanation of the effect of shot peening on the increase in fatigue life of the blade was proposed.

scholarly journals Assessment of the Impact of Shot-Peening on the Fatigue Life of a Compressor Blade Subjected to Resonance Vibrations

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5726
Author(s):  
Arkadiusz Bednarz ◽  
Wojciech Z. Misiolek
Keyword(s):  
Fatigue Life ◽  
Shot Peening ◽  
Geometric Model ◽  
Fatigue Analysis ◽  
Compressor Blade ◽  
Strength Analysis ◽  
Equivalent Stresses ◽  
Resonance Vibrations ◽  
Secondary Objective ◽  
The Impact

This publication presents an assessment of the influence of a surface treatment such as shot-peening on the fatigue life of a compressor blade exposed to resonant vibrations. As part of the work, a geometric model of the blade was developed, and a numerical modal and fatigue analysis were performed. The fatigue analysis was based on the Manson–Coffin–Basquin and Ramberg–Osgood models. Additionally, the location of the highest equivalent stresses was established. Based on the results of the strength analysis, two points were identified where a fatigue crack may potentially occur. As part of the work, the influence of different values of residual stresses on the results of the fatigue life was determined. The obtained results were compared to the literature values of fatigue life for this blade. A secondary objective of the study was to determine the size of the grains at various points of the blade, as well as the thickness of the layer plasticized as a result of peening. The relationship between the location of the highest values of the equivalent stresses and the thickness of the plasticized layer was determined. An explanation of the effect of shot-peening on the increase in the fatigue life of the blade was proposed.

scholarly journals Experimental Investigation on the Effect of Shot Peening and Deep Rolling on the Fatigue Response of High Strength Fasteners

Metals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1093 ◽  
Author(s):  
Reggiani
Keyword(s):  
Fatigue Life ◽  
Shot Peening ◽  
High Strength Steels ◽  
High Strength ◽  
Experimental Tests ◽  
Published Data ◽  
Deep Rolling ◽  
Beneficial Impact ◽  
The Impact ◽  
Fatigue Life Enhancement

Shot-peening and deep rolling are mechanical surface treatments that are commonly applied to enhance the fatigue performances of components, owing to their capacity to generate compressive residual stresses and induce work hardening. However, literature is still poor of published data concerning the application of these treatments to high strength steels fasteners, although these represent a class of components among the most widespread. In the present work, the impact of deep rolling and shot-peening performed in the underhead radius of two set of fasteners made of 36NiCrMo and 42CrMoV for fatigue life enhancement has been investigated. The experimental tests consisted of six combinations of shot-peening and deep rolling, including the non-treated state. Two test campaigns have been sequentially carried out with different process parameters and treatment sequences. The results always showed a beneficial impact of the deep rolling on fatigue, especially for the 42CrMoV steel. Conversely, the effect of the shot-peening strongly depended on the selected set of parameters, alternatively leading to an improvement or a worsening of the fatigue life in relation to the level of induced surface roughness.

Effects of Surface Treatments on the Fatigue Response of High Strength Fasteners

2019 ◽  
Vol 813 ◽  
pp. 352-357 ◽  
Author(s):  
Barbara Reggiani ◽  
Giorgio Olmi ◽  
Leonardo Orazi ◽  
Luca Tomesani ◽  
Stefano Fini ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Shot Peening ◽  
Rolling Force ◽  
High Strength ◽  
Deep Rolling ◽  
Experimental Campaign ◽  
Life Enhancement ◽  
The Impact ◽  
Fatigue Life Enhancement ◽  
Treated State

The aim of the present work was the assessment of the impact of deep-rolling and shot-peening performed in the underhead and in the unthreaded shank of two high strength screws (36 NiCrMo and 42 CrMoV) for fatigue life enhancement. The experimental campaign consisted of six combinations, including the non-treated state. The aforementioned treatments were evaluated alone or with shot-peening performed after deep-rolling in the underhead fillet of the screws. Deep rolling was carried out at the optimal rolling force, whereas two shot diameters were considered for shot-peening (Z100 and UFS70). The results have been evaluated in terms of fatigue limits and factor effects have been assessed by marginal mean plots.

scholarly journals Design and Fatigue Analysis of Shot Peened Leaf Spring

2019 ◽  
Vol 9 (1) ◽  
pp. 1120-1126
Keyword(s):  
Fatigue Life ◽  
Shot Peening ◽  
High Strength ◽  
Load Level ◽  
Spring Steel ◽  
Leaf Spring ◽  
Leaf Springs ◽  
Point Test ◽  
Life Improvement ◽  
The Impact

The paper handles the fatigue and failing analysis of serial shot-peened leaf springs of cumbersome vehicles emphasizing on the impact of shot peening on fatigue life, coping with automotive leaf springs, the shot peening method turns into an important step in production.In the situation of leaf spring suspensions, however, asystematic research of the effect of shot peening about fatigue life isstill required. Experimental stress-life curves are determined with the aid of the usage of investigating clean specimen subjected to shot peening. those test consequences are as compared to corresponding ones identified from cyclic three-point test on shot peened serial leaf springs in order to show the influence of applied heat treatment and shot peening approach on fatigue existence of high-strength used to get leaf spring manufacturing, reliant on the load level. Analyses are performed to explain the effects resulting from shot peening practice on the surface features of the high-strength spring steel under examination. The evaluation of fatigue results shows that almost no life improvement due to production highlighting the importance for mutual variation in parameters of shot peening and thermal treatment so that there is sufficient progress in life

Relationship between Saturation Curve and Peening Parameters for Aerospace Shot Peening Process

2007 ◽  
Vol 561-565 ◽  
pp. 965-968
Author(s):  
Chi Kong Huang ◽  
Chau Chen Torng ◽  
Hsien Ming Chang
Keyword(s):  
Fatigue Life ◽  
Fatigue Strength ◽  
Shot Peening ◽  
Mass Production ◽  
Saturation Curve ◽  
Statistical Methodology ◽  
Saturation Point ◽  
Verification Period ◽  
Machine Parts ◽  
The Relationship

The shot peening process can improve the fatigue strength of machine parts of aero structures. Due to the strength requirement of aircraft, the shot peening is widely used in the manufacturing process. Most of shot peening parts peened after penetrate inspection to ensure no defect and crack on the surface, and then peen the shots on the surface of machine parts to increase the fatigue life. During the first article verification period, the saturation curve has to be created. The peening parameters of mass production would base on the peening parameters of saturation point of the saturation curve. By using statistical methodology to analysis saturation curve of shot peening process, this study tries to find the relationship between saturation curve and relative peening parameters, such as peening time, air pressure. The results of this analysis can provide an efficient and economical approach for the process engineer and technician to develop the new shot peening process.

An Experimental Study on Fatigue Life Variance, Residual Stress Variance, and Their Correlation of Face-Turned and Ground Ti 6Al-4V Samples

2002 ◽  
Vol 124 (4) ◽  
pp. 809-819 ◽  
Author(s):  
Xiaoping Yang ◽  
C. Richard Liu ◽  
A. F. Grandt
Keyword(s):  
Residual Stress ◽  
Fatigue Life ◽  
Manufacturing Processes ◽  
Machining Processes ◽  
Stress Variation ◽  
Bending Fatigue ◽  
New Process ◽  
The Impact ◽  
The Relationship ◽  
Stress Variance

It is well known that there is a large variance associated with fatigue life. However, in literature little is found on the relationship between manufacturing processes and fatigue variance of the manufactured components. In this research, the influence of machining processes on the fatigue variance of the machined Ti 6Al-4V samples is studied experimentally. The impact is evaluated by comparing the safety ratios of face-turned samples with those of ground samples. The safety ratio is defined as the average fatigue life over the fatigue life with a reliability of 95%. In the computation, it is assumed that fatigue life follows Weibull distribution. Two sets of faced samples and two sets of ground samples are tested for bending fatigue. The test is under constant amplitude in high cycle fatigue regime under room temperature. The results show that the safety ratios of face-turned samples are significantly smaller than are those of ground samples. Consequently, it is suggested that fatigue life variance be considered as a new process capability. This capability serves as a basis in choosing manufacturing processes for making fatigue critical products such as aircraft. Another finding is the positive correlation between the residual stress variation and fatigue life variation. This correlation suggests that a better understanding and prediction of residual stress lead to a better prediction of fatigue life.

The Relationship Between Design, Processing and Shot Peening on Wheel Plate Failures

2014 ◽  
Author(s):  
Steven L. Dedmon
Keyword(s):  
Fatigue Life ◽  
Residual Stresses ◽  
Cold Rolling ◽  
Shot Peening ◽  
Cyclic Stresses ◽  
Compressive Stresses ◽  
Freight Car ◽  
The Relationship ◽  
Fatigue Failures ◽  
Improve Fatigue

Wheel plate failures occur rarely in North American freight car service. When they do occur, derailments are a likely result. Shot peening has been used to improve fatigue life for more than 80 years and the efficacy of the process is now undisputed in reducing fatigue failures of parts subjected to high levels of cyclic stresses. The introduction of residual compressive stresses from shot peening is acknowledged as the reason for the improvement in fatigue life; comparable processes such as cold rolling, are successful for the same reason. Since residual stresses are so important to fatigue life, then design and processing prior to shot peening should have an equally important role. This investigation demonstrates some of the variables which are important to producing wheels resistant to plate fatigue failures.

Fracture Mechanics Approach to Fatigue Analysis in Design

1978 ◽  
Vol 100 (2) ◽  
pp. 113-120 ◽  
Author(s):  
R. P. Wei
Keyword(s):  
Fatigue Life ◽  
Fracture Mechanics ◽  
Crack Growth ◽  
Environmental Variables ◽  
Life Prediction ◽  
Fatigue Analysis ◽  
Growth Data ◽  
Engineering Structures ◽  
The Relationship

Many engineering structures are subjected to cyclically varying (fatigue) loads during service. Fatigue analysis, or the estimation of fatigue lives on such structures, is therefore an essential part of engineering design. In this paper, the fracture mechanics approach to fatigue analysis is described. This approach has evolved over the last decade, and is based on the assumptions (i) that there are preexisting flaws or cracks in a structural component, or that cracks are initiated early in the life of the component, and (ii) that the fatigue life of the component is determined principally by the rate of growth of these cracks under cyclic loading. Characterization of the rate of fatigue crack growth in terms of fracture mechanics parameters is discussed. The relationship between these parameters and those commonly used in fatigue analysis is identified. A procedure for estimating fatigue lives from crack growth data is outlined. The importance of various loading and environmental variables on fatigue life prediction is considered. A number of example problems are given to illustrate the procedure and the various effects.

Performance-Based Geometric Tolerancing of Compressor Blades

2004 ◽  
Author(s):  
Caroline Twomey Lamb ◽  
David L. Darmofal
Keyword(s):  
Geometric Model ◽  
Three Dimensional ◽  
Aerodynamic Performance ◽  
Compressor Blade ◽  
Geometric Parameters ◽  
Performance Limits ◽  
Compressor Blades ◽  
Performance Limit ◽  
Geometric Tolerancing ◽  
The Impact

The relationship between statically measured geometric parameters (tolerances) and the aerodynamic performance of an airfoil are investigated in this paper. The goal is to determine which geometric parameters are critical to control during manufacturing, such that a blade will have acceptable aerodynamic performance. A probabilistic model of geometric variability for a three-dimensional blade is derived. Using this geometric model, probabilistic aerodynamic simulations are conducted to analyze the variability in aerodynamic performance. Tolerance optimization is then applied in which tolerance ranges are modified to best sort blades according to some arbitrary performance limit. The optimization is performed for several limits, expressed as a percent of nominal performance, to observe both which parameters best predict performance and the accuracy of that prediction at each limit. Two blade cases are considered, both based on the same compressor blade: the base compressor blade with nominal manufacturing noise; and a probabilistic redesign of the blade geometry designed to minimize the impact of manufacturing noise, also analyzed with nominal manufacturing noise. Results show the best static indicators of meanline performance are parameters concerning the LE of the airfoil, and the effectiveness of these parameters vary greatly depending on the chosen performance limit. In addition, it was shown that the optimized tolerances for the redesigned blade were consistently looser, or less restrictive, than those for the original blade population for a given performance limit. The differences in observed optimized tolerance ranges are small for less restrictive performance limits but at more aggressive performance limits, there is a 20–30% increase in tolerance range for the redesigned blade population.

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