Effect of heat treatment on the growth rate of transverse fatigue cracks in railroad rails

1991 ◽  
Vol 27 (1) ◽  
pp. 67-69
Author(s):  
M. N. Georgier ◽  
K. P. Zamula ◽  
N. Ya. Mezhova ◽  
V. A. Reikhart
Keyword(s):  
Heat Treatment ◽  
Growth Rate ◽  
Fatigue Cracks ◽  
Railroad Rails

scholarly journals Probabilistic Evaluation of Fatigue Crack Growth Rate for Longitudinal Tungsten Inert Gas Welded Al 6013-T4 Under Various PostWeld Heat Treatment Conditions

2019 ◽  
Vol 130 ◽  
pp. 01016 ◽  
Author(s):  
I Made Wicaksana Ekaputra ◽  
Gunawan Dwi Haryadi ◽  
Stefan Mardikus ◽  
Rando Tungga Dewa
Keyword(s):  
Heat Treatment ◽  
Growth Rate ◽  
Fatigue Crack ◽  
Crack Growth Rate ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Fatigue Crack Growth Rate ◽  
Postweld Heat Treatment ◽  
Inert Gas ◽  
Probabilistic Assessment

In this study, a Monte Carlo method (MCM) was applied on the fatigue crack growth rate (FCGR) curves to evaluate a probabilistic assessment for the welded longitudinal Al 6013-T4 aluminum alloy under various post-weld heat treatment (PWHT) conditions. The welded CT specimens were manufactured by a tungsten inert gas (TIG) welding, and the fatigue crack growth (FCG) tests were conducted by following ASTM E647. Before conducting the FCG test, the PWHT conditions were applied to the welded CT specimens under three different aging times of 6 h, 18 h, and 24 h at 175 C. The FCGR curves were generated from the FCG data and plotted on the da/dN versus Δk curves. The constants C and m were determined by drawing the fitting line on the FCGR curves. A sizeable random number was generated from the obtained constants by MCM. By plotting these constants, the probabilistic assessment of FCGR was determined on the da/dN versus Δk curves. The results showed that the confidence interval was appeared on the FCGR curves and limited by the upper and lower probabilistic lines. It was found that the lower and upper probabilistic lines were formed at 1 % and 90 %, respectively.

Growth rate of fatigue cracks in fields of residual stresses in titanium welded joints with different content of embrittling impurities

1990 ◽  
Vol 22 (11) ◽  
pp. 1562-1569 ◽  
Author(s):  
V. T. Troshchenko ◽  
V. V. Pokrovskii ◽  
V. L. Yarusevich ◽  
V. I. Mikhailov ◽  
V. A. Sher
Keyword(s):  
Growth Rate ◽  
Residual Stresses ◽  
Welded Joints ◽  
Fatigue Cracks ◽  
Different Content

The Growth Rate of Semi-Elliptic Fatigue Cracks in Thick-Walled Cylinders

1983 ◽  
Vol 22 ◽  
Author(s):  
W. A. Lees ◽  
P. S. J. Crofton
Keyword(s):  
Growth Rate ◽  
Crack Growth Rate ◽  
Internal Pressure ◽  
Crack Growth ◽  
Fatigue Cracks ◽  
Low Alloy Steel ◽  
Linear Elastic ◽  
Fatigue Data ◽  
Elastic Fracture ◽  
Crack Growth Rates

ABSTRACTThe rate of growth of fatigue cracks originating at the bore and at the outside surface of thick-walled low alloy steel cylinders has been measured for cylinders subjected to fluctuating internal pressure.Analysis of the results using linear elastic fracture mechanics relationships shows that crack growth rates found in air adequately predict the behaviour of cracks growing from the outside surface of a cylinder.Fatigue cracks growing from the bore of a cylinder subjected to fluctuating internal pressure are found to advance at a consistently higher rate than that predicted from crack growth rate tests carried out in air.These findings are discussed in relation to the proposed adoption of existent strain-life fatigue data for pressure vessel design.

Heat therapy of virus-infected cultures of the cultivated mushroom Agaricus bisporus

1973 ◽  
Vol 24 (4) ◽  
pp. 553 ◽  
Author(s):  
NG Nair
Keyword(s):  
Heat Treatment ◽  
Growth Rate ◽  
Agaricus Bisporus ◽  
Thermal Inactivation ◽  
Treatment Time ◽  
Virus Particles ◽  
Heat Therapy ◽  
Cultivated Mushroom ◽  
Pre Treatment

A procedure for elimination of viruses by heat treatment of virus-infected isolates of the cultivated mushroom Agaricus bisporus has been perfected. A minimum treatment time of 3 weeks at 33�C was required. The effect of heat treatment was assessed in terms of increased growth of the isolates in vitro and absence of virus particles. Growth rate was not always a good measure of effective heat treatment. Some virus-infected isolates were found which can act as symptomless carriers. The effect of heat treatment appeared to depend on the pre-treatment which the isolates had received. Elimination of viruses did not occur when the isolates were grown at 25� prior to heat treatment. It appears, therefore, that thermal inactivation of viruses is not complete in mature mycelium.

Research on Preparation Technology for Machinable Ceramics

2014 ◽  
Vol 804 ◽  
pp. 203-206
Author(s):  
Hao Zhang ◽  
Yan Xu ◽  
Hai Yun Jin ◽  
Guan Jun Qiao
Keyword(s):  
Heat Treatment ◽  
Growth Rate ◽  
Phase Composition ◽  
Crystallization Temperature ◽  
Treatment Process ◽  
Glass Ceramics ◽  
Heat Treatment Process ◽  
Preparation Technology ◽  
The Relationship ◽  
Sintering Method

In this paper, the compact SiO2-B2O3-Al2O3-MgO-F machinable ceramics were prepared through melt-cast and sintering method. The phase composition and microstructure of the ceramics were analyzed and observed using XRD and SEM, and the relationship between processing and microstructure were discussed. The results showed that, after the heat treatment, the main phase of the ceramics changed from fluorophlogopite (mica like) to fluoramphibole (rod like). When the crystallization temperature at 950°C, the nuclei growth rate of the mica glass-ceramics was higher. Meanwhile, a small quantity of forsterite (Mg2SiO4) was also crystallized out in the process. The best heat treatment process was nucleated at 630°C for 2h and crystallized at 950°C for 2h.

Growth rate of fatigue cracks in the frame side members of the 2T�-116 locomotive

1977 ◽  
Vol 9 (5) ◽  
pp. 561-567
Author(s):  
M. E. Georgiev ◽  
V. N. Danilov ◽  
N. Ya. Mezhova ◽  
E. M. Morozov ◽  
V. B. Tskipurishvili
Keyword(s):  
Growth Rate ◽  
Fatigue Cracks
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