Corrosion Fatigue Tests Using Strain Gauges for Measuring Load and Crack Length

CORROSION ◽  
10.5006/2123 ◽  
2016 ◽  
Vol 72 (12) ◽  
pp. 1547-1555 ◽  
Author(s):  
Rodrigo R.A. Garcia ◽  
Felipe Cristaldi C. Caldas ◽  
Oscar Rosa Mattos
Keyword(s):  
Crack Length ◽  
Corrosion Fatigue ◽  
Fatigue Tests ◽  
Strain Gauges

scholarly journals Methods for automated crack length detection in fracture mechanical fatigue tests of unreinforced polymers

2020 ◽  
Vol 28 ◽  
pp. 1184-1192
Author(s):  
Anja Gosch ◽  
Jutta Geier ◽  
Florian Arbeiter ◽  
Michael Berer ◽  
Gerald Pinter
Keyword(s):  
Crack Length ◽  
Fatigue Tests ◽  
Mechanical Fatigue

scholarly journals Impact of Long-Term Operation on the Reliability and Durability of Transit Gas Pipelines

2020 ◽  
Vol 70 (1) ◽  
pp. 115-126
Author(s):  
Okipnyi Igor ◽  
Poberezhny Lyubomyr ◽  
Zapukhliak Vasyl ◽  
Hrytsanchuk Andrii ◽  
Poberezhna Liubov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Corrosion Fatigue ◽  
Static Loading ◽  
Physical And Mechanical Properties ◽  
Fatigue Tests ◽  
Gas Pipelines ◽  
Term Operation ◽  
Full Capacity ◽  
Corrosive Environments

AbstractCorrosion and corrosion-fatigue tests of the material of the pipeline, which was in operation for 41 years. It has been shown that prolonged operation reduces the parameters of resistance to fatigue and prolonged static loading in corrosive environments. It was established that the degradation of physical and mechanical properties is insignificant, Ukraine’s main gas pipelines are ready to operate at full capacity provided that timely monitoring measures are carried out.

Corrosion characteristics of carbon steel in solutions of synthetic detergents

2020 ◽  
pp. 112-115
Author(s):  
I.A. Strel’nikov ◽  
D.A. Pestryaev ◽  
Sh.V. Sadetdinov
Keyword(s):  
Carbon Steel ◽  
Corrosion Rate ◽  
Aqueous Solutions ◽  
Corrosion Fatigue ◽  
Potentiodynamic Polarization ◽  
Cyclic Strength ◽  
Fatigue Tests ◽  
Polarization Curves ◽  
Positive Side ◽  
Potentiodynamic Polarization Curves

Data of corrosion rate are obtained experimentally, values of braking coefficient, protection degree of steel 10 in 3 % aqueous solutions of detergents ML-52, MS-8 and Labomid-203 are calculated. It is found that when the composition of synthetic detergents diethylene tetraborate ammonium (DETA) composition (NH4)2B4O7·2C2H8N2·2H2O concentration of 0.5 % wt., the corrosion rate of carbon steel is significantly reduced, and the values of the braking coefficient and the protection degree increase and reach almost significant values. By removing the potentiodynamic polarization curves, it is shown that in the presence of DETA, the dissolution potentials of steel 10 are shifted to the positive side relative to the potential in the background solutions and the anode process is predominantly slowed down. Corrosion-fatigue tests indicate increase in the coefficient of cyclic strength reserve of carbon steel in aqueous solutions of synthetic detergents with the addition of DETA. The results allow us to recommend the compound diethylene tetraborate ammonium as effective anticorrosive additive to synthetic detergents used to clean parts from technological contaminants in the repair of process metallurgical plants machines.

Crude Oil Corrosion Fatigue of L485MB Pipeline Steel

2015 ◽  
Vol 137 (5) ◽  
Author(s):  
Ľ. Gajdoš ◽  
M. Šperl ◽  
J. Bystrianský
Keyword(s):  
Crude Oil ◽  
Strain Rate ◽  
Corrosion Fatigue ◽  
Pipeline Steel ◽  
Fatigue Tests ◽  
Fatigue Properties ◽  
Oil Pipeline ◽  
Oil Processing ◽  
Tension Loading ◽  
Aggressive Effect

An investigation was made into the fatigue properties of L485MB (X70) pipeline steel after 13 yr of exploitation as a crude oil pipeline material. Fatigue tests in zero-to-tension loading were carried out (i) in air, (ii) in crude oil, (iii) in a mixture of crude oil with rainwater, and (iv) in water separated from the crude oil phase. The aim of the investigation was to assess the degree of degradation of the fatigue properties of this steel due to the action of environments typical for crude oil processing and transport. The results are not directly comparable to any corrosion fatigue experienced by the crude oil pipeline, since the strain rate for the tests was higher by an order of five than the strain rate observed in typical loading cycles. The results showed that crude oil and a mixture of crude oil with rainwater had no aggressive effect on the steel in the sense of reducing its fatigue characteristics, while the separated water had an aggressive effect.

On Electrochemical Polarization Curve and Corrosion Fatigue Resistance of the AZ31 Magnesium Alloy

2010 ◽  
Vol 452-453 ◽  
pp. 321-324 ◽  
Author(s):  
Sotomi Ishihara ◽  
Z.Y. Nan ◽  
Tomonori Namito ◽  
Takahito Goshima ◽  
Satoshi Sunada
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloys ◽  
Fatigue Resistance ◽  
Polarization Curve ◽  
Corrosion Fatigue ◽  
Chloride Solution ◽  
Fatigue Tests ◽  
Mg Alloys ◽  
Electrochemical Polarization ◽  
Fatigue Characteristic

Recently, due to increasing popularity of the magnesium alloys, many studies on corrosion resistance of the magnesium alloys have been reported to improve their corrosion resistance. However, it is not clarified yet whether an electrochemical polarization curve or a corrosion rate is a good measure for the corrosion fatigue resistance or not. In the present study, corrosion fatigue tests, the weight loss test, and measurement of the electrochemical polarization curve were performed in 3% sodium chloride solution using both the extruded and the rolled Mg alloys. It was clarified that there are no differences in the corrosion fatigue lives between the extruded and the rolled Mg alloys, though they have different corrosion resistance. So, it was concluded that the corrosion fatigue characteristic does not correspond well with the trend in corrosion resistance.

Influence of the Embedding Media on the Results of Standard In Vitro Fatigue Tests on the Femoral Components

1994 ◽  
Vol 208 (3) ◽  
pp. 131-137 ◽  
Author(s):  
M Viceconti ◽  
A Toni ◽  
A Giunti
Keyword(s):  
Mechanical Properties ◽  
Stress Analysis ◽  
Mechanical Tests ◽  
Fatigue Tests ◽  
Strain Gauges ◽  
Static Properties ◽  
Static Mechanical ◽  
Hip Stems ◽  
Dental Applications

The aim of the present investigation was to determine the effects of the embedding material mechanical properties on the in vitro fatigue endurance of femoral hip stems as determined following ISO standards. Acrylic cements are usually employed as embedding media; due to the high cost of surgical cements, acrylic cements for dental applications are commonly used. Two acrylic cements for dental applications were tested to determine their static mechanical properties and compared with those found for three surgical cements. The same two dental cements were also compared as embedding media in a series of ISO 7206/3 fatigue tests on a mini-size Cr-Co stem; prosthesis stress analysis using strain gauges was also performed. The mechanical tests on the different cements showed that behind the definition of acrylic cement are materials with considerably different mechanical static properties. The fatigue campaign confirmed the influence of embedding media on the results obtained from the ISO 7206/3 fatigue test. Under a load of 4200 N the stem failed after four million cycles when using one cement; it did not fail after ten million cycles when using another cement. Stress analysis with strain gauges substantially confirmed these findings.

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