Fatigue Damage Assessment Correlating with I-Kaz Coefficient

2013 ◽  
Vol 471 ◽  
pp. 235-240
Author(s):  
Mahfodzah M. Padzi ◽  
S. Abdullah ◽  
Mohd Zaki Nuawi
Keyword(s):  
Fatigue Life ◽  
Carbon Steel ◽  
Fatigue Damage ◽  
Strain Gauge ◽  
Damage Assessment ◽  
Data Acquisition System ◽  
Sampling Frequency ◽  
Fatigue Tests ◽  
Constant Loading ◽  
Aisi 1045

This paper describes the correlation between fatigue life with the I-kaz coefficients. Fatigue tests were performed according to the ASTM E466-96 standard with a strain gauge attached to the specimen being tested. AISI 1045 carbon steel was used as the material for this test due to its wide applications in the automotive and machinery industry. Fatigue tests were carried out at several constant loading stresses of 610 MPa, 650 MPa and 690 MPa at the sampling frequency of 8 Hz. A set of data acquisition system was used to collect the fatigue strain signals. The integrated Kurtosis-based algorithm for Z-filter (I-kaz) technique had been used to find the I-kaz coefficient. The I-kaz coefficient is found to have a good correlation with fatigue life, other than can represent fatigue damage.

Novel Methods for High-Cycle Fatigue Life Determination

2019 ◽  
Vol 810 ◽  
pp. 40-45
Author(s):  
Pavel Konopík ◽  
Radek Procházka ◽  
Martin Rund ◽  
Jan Džugan
Keyword(s):  
Fatigue Life ◽  
High Cycle Fatigue ◽  
Fatigue Tests ◽  
Cycle Fatigue ◽  
Testing Methods ◽  
Destructive Testing ◽  
New Approach ◽  
Constant Loading ◽  
Thermographic Analysis ◽  
Novel Methods

In the present paper, two novel methods for determining the fatigue limit are presented. Despite the fact that these methods are different in principle, both represent a new approach to testing where the main benefit is reduced consumption of material. The first method is based on small round specimens and can be considered as one of semi-destructive testing methods. The second method is based on infrared thermographic analysis and requires only one specimen. Results obtained with these techniques were compared with those obtained from standard high-cycle force-controlled fatigue tests under constant loading until failure.

Fatigue Life Assessments of the AISI 1513 Carbon Steel of a Vehicle Lower Arm Subjected to Clockwise and Counter-Clockwise Road Strains

2020 ◽  
Vol 402 ◽  
pp. 45-49
Author(s):  
Husaini ◽  
Teuku Edisah Putra ◽  
Muhammad Reza Rizky ◽  
Rauzatul Akmal ◽  
Iskandar Hasanuddin ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Carbon Steel ◽  
Strain Gauge ◽  
The Right ◽  
Cycles To Failure

This study aims to predict the fatigue life of the AISI 1513 carbon steel as the material for the vehicle lower arm subjected to road strains. Measurement of the strain signals was done by attaching a strain gauge at the left lower arm and driving the vehicle on clockwise and counter-clockwise roads at a speed of 30 km/h. According to the results based on the strain-life approach, the clockwise road gave the fatigue life of 2,600,000 cycles to failure, which was 1,862 % lower than the counter-clockwise road. It indicated that when the vehicle turned to the right, the lower arm on the left side subjected to a higher strain, resulting in a shorter fatigue life.

Using a Dovetail Fixture to Study Fretting Fatigue and Fretting Palliatives

2003 ◽  
Vol 128 (2) ◽  
pp. 133-141 ◽  
Author(s):  
B. P. Conner ◽  
T. Nicholas
Keyword(s):  
Fatigue Life ◽  
Service Life ◽  
Fatigue Damage ◽  
Fretting Fatigue ◽  
Fatigue Tests ◽  
Turbine Engines ◽  
Aluminum Bronze ◽  
Gas Turbine Engines ◽  
Contact Loads ◽  
Low Plasticity Burnishing

Fretting fatigue damage can reduce the service life of engineering components in contact. The attachment between blades and disks in the fan and compressor stages of gas turbine engines is often a dovetail geometry. As a result, normal and tangential cyclic contact loads are present. Results of fretting fatigue tests using a new dovetail fixture are detailed here. Dovetail specimens and three types of contact pads were all machined out of Ti−6A1−4V. Two types of palliatives are also examined: aluminum bronze coatings and low-plasticity burnishing. While the palliatives were effective in increasing the fatigue life, the three pad geometries produced essentially the same fatigue life.

Change of the Elastic Characteristics of a Fiber-Reinforced Laminate as a Result of Progressive Fatigue Damage

2021 ◽  
Vol 316 ◽  
pp. 955-960
Author(s):  
M.Sh. Nikhamkin ◽  
D.G. Solomonov
Keyword(s):  
Fatigue Life ◽  
Fatigue Damage ◽  
Natural Frequencies ◽  
Fatigue Testing ◽  
Fatigue Behavior ◽  
Fatigue Tests ◽  
Fiber Reinforced ◽  
Second Stage ◽  
Two Stages ◽  
Elastic Characteristics

It is a widely known fact that the stiffness of polymer composite materials decreases with the accumulation of fatigue damage under cyclic loading. The purpose of this article is to develop a method and obtain experimental data on decrease of the elastic characteristics of a fiber-reinforced laminate, as a result of progressive fatigue damage. The developed technique consists of two stages. At the first one, the natural frequencies and eigenmodes of the samples during their fatigue testing are experimentally obtained. The dependences of the natural frequencies of the samples on the number of loading cycles are found. At the second stage, the four elasticity parameters of the laminate monolayer (two Young modules, the shear module and Poisson's ratio) are identified via the natural frequencies. The inverse numerical/experimental technique for material properties identification is applied. The dependences of the natural frequencies and mentioned elastic characteristics on the relative fatigue life are obtained as experimental results of both modal and fatigue tests. The results can be useful to study the fatigue behavior of the investigated materials and to create methods for calculating fatigue life.

A Study on the Fatigue Life Prediction and Evaluation of the Natural Rubber Components for Automobile Vehicles

2006 ◽  
Vol 326-328 ◽  
pp. 589-592
Author(s):  
Chang Su Woo ◽  
Wan Doo Kim ◽  
Jae Do Kwon
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fatigue Life ◽  
Natural Rubber ◽  
Fatigue Damage ◽  
Damage Parameter ◽  
Fatigue Tests ◽  
Element Analysis ◽  
Engine Mount ◽  
Lagrange Strain

The fatigue analysis and lifetime evaluation are very important in design procedure to assure the safety and reliability of the rubber components. The interest of the fatigue life of rubber components such as the engine mount is increasing according to the extension of warranty period of the automotive components. In this study, the fatigue lifetime prediction methodology of the vulcanized natural rubber was proposed by incorporating the finite element analysis and fatigue damage parameter determined from fatigue tests. Finite element analysis of 3D dumbbell specimen of natural rubber was performed based on a hyper-elastic material model determined from the tension, compression and shear tests. The Green-Lagrange strain at the critical location determined from the finite element analysis was used for evaluating the fatigue damage parameter of the natural rubber. Fatigue tests were performed using the 3D dumbbell specimens with different levels of maximum strain and various load. The basic mechanical properties test and the fatigue test of rubber specimens under the normal and elevated temperature were conducted. Fatigue life curves can be effectively represented by a following single function using the maximum Green-Lagrange strain. Fatigue lives of the natural rubber are predicted by using the fatigue damage parameters at the critical location. Predicted fatigue lives of the engine mount agreed fairly with the experimental fatigue lives a factor of two.

Ultrasound Signals Response Associated to Fatigue Failure Behaviour using Statistical Analysis

2013 ◽  
Vol 65 (1) ◽  
Author(s):  
M. M. Padzi ◽  
S. Abdullah ◽  
M. Z. Nuawi
Keyword(s):  
Carbon Steel ◽  
Fatigue Test ◽  
Fatigue Failure ◽  
Structural Changes ◽  
Energy Content ◽  
Fatigue Tests ◽  
Failure Behaviour ◽  
Aisi 1045 ◽  
Steel Aisi ◽  
Ultrasound Signals

In this paper, ultrasound signals had been analysed using a statistical-based approach to evaluate and predict fatigue failure of carbon steel AISI 1045. Fatigue tests were performed according to the ASTM E466-96 standard with the attachment of an ultrasound sensor to the tested specimen. The material used in this test was the AISI 1045 carbon steel due to its extensive application in automotive and machinery industry. Fatigue test was carried out at a constant loading stress at the sampling frequency of 8 Hz. A set of data acquisition system was used to collect those fatigue ultrasound signals. All obtained data were analysed using specific software. Ultrasound signals were collected during fatigue test in order to detect any structural changes occurs during the test. Fatigue damage characteristics were observed based on the ultrasound signals characteristics and a further analysis was performed using statistical approach. The results of signals distribution, r.m.s value and energy content of the signals were discussed to correlate fatigue failure behaviour and ultrasound signals.

Variable Loading Sequence Effect for Thermal Fatigue at a Mixing Tee

2019 ◽  
Author(s):  
Koji Miyoshi ◽  
Masayuki Kamaya
Keyword(s):  
Fatigue Life ◽  
Fatigue Damage ◽  
Pipe Wall ◽  
Hot Spot ◽  
Fatigue Tests ◽  
Stress Fluctuation ◽  
Fluctuation Range ◽  
Miner’S Rule ◽  
Loading Sequence ◽  
Miner's Rule

Abstract Mixing flow causes fluctuations in fluid temperature near the pipe wall and may result in fatigue crack initiation. In a previous study, the authors reported the characteristics of the thermal stress to cause thermal fatigue at a mixing tee. A large stress fluctuation was caused by movement of the hot spot, at which the pipe wall was heated by hot flow from the branch pipe. According to a general procedure, fatigue damage is calculated by the linear damage accumulation rule. However, it has been reported that Miner’s rule does not always predict the fatigue life conservatively for variable stress amplitude. In this study, we investigated the change in fatigue life due to variable strain around the hot spot. The time histories of the strain around the hot spot were estimated by finite element analysis (FEA) for which the temperature condition was determined by wall temperature measured in a mock-up test. Strain-controlled fatigue tests were conducted using smooth cylindrical specimens made of stainless steel. The fatigue damage at failure of the specimen was calculated using Miner’s rule. The calculated fatigue damage around the hot spot became less than unity and the minimum value was 0.18. Therefore, Miner’s rule predicted non-conservative fatigue life. In addition, the calculated fatigue damage inside the hot spot was larger than those outside the hot spot and at the position of maximum stress fluctuation. Fatigue tests using strain with periodic overload were also conducted in order to investigate the effect of the loading history on fatigue life. It was shown that the strain with periodic overload reduced the fatigue life. The calculated fatigue damage for the strain at the maximum position of stress fluctuation range seemed to be smaller than those at other positions. This implies that the fatigue life can be estimated conservatively from the viewpoint of the loading sequence effect by calculating the fatigue damage using Miner’s rule for the strain at the maximum position of stress fluctuation range.

scholarly journals Improvement of fatigue life of AISI 1045 carbon steel of parts obtained by turning process through feed rate

2018 ◽  
Vol 9 ◽  
pp. 243-249
Author(s):  
Khadija Kimakh ◽  
Abdelkarim Chouaf ◽  
Samir Aghzer ◽  
Amal Saoud ◽  
El hassan Malil ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Carbon Steel ◽  
Feed Rate ◽  
Turning Process ◽  
Aisi 1045
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