Fatigue Crack Propagation Limit Curves for Different Metallic and Non-Metallic Materials

Lukács, János

doi:10.4028/www.scientific.net/msf.414-415.31

Cited by 18 publications

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“…Stable crack propagation and/or crack tip blunting can be detected during the hold time at nominally 300 ºC testing temperature. Following our earlier works and methodology [9][10][11], the determination of the fatigue crack propagation limit or design curves requires further investigations.…”

Section: Discussionmentioning

confidence: 99%

Fatigue crack growth tests on type 321 austenitic stainless steel in corrosive environment and at elevated temperature

Lukács

2010

Procedia Engineering

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There are different documents and standards containing fatigue crack propagation limit or design curves and rules for the prediction of crack growth. The background of the curves and the calculations consist of two basic parts: statistical analysis of numerous fatigue crack propagation experiments and fatigue crack propagation law. The research work aimed to measure basic data for limit curves on austenitic stainless steel (type 321), in corrosive environment and at elevated temperatures; and to determine the design curves based on statistical analysis of measured data and the Paris-Erdogan law. Fatigue crack growth tests were performed on modified CT specimens in water solution (30 g CuSO 4 *5H 2 O + 10 g NaCl + 3 g NaOH in 1000 ml water), at nominally 100 C and 300 C testing temperatures. The examinations were executed by constant load amplitude method, the stress ratio was R = 0,1, and f = 20 Hz frequency was used during the whole tests . In order to study the hold time effect, fatigue crack growth tests were terminated and 3 hours hold time period was applied. The constants of the Paris-Erdogan law were calculated and these values were compared with data can be found in the literature.

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Section: Discussionmentioning

confidence: 99%

Fatigue crack growth tests on type 321 austenitic stainless steel in corrosive environment and at elevated temperature

Lukács

2010

Procedia Engineering

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“…A vizsgálataink során kapott eredmények és azok kiértékelése alapján a fáradásos repedésterjedési határdiagramok meghatározhatóak [16].…”

Section: Eredmények éS Következtetésekunclassified

S690QL és S960M nagyszilárdságú acélok hegesztett kötéseinek fáradásos repedésterjedéssel szembeni ellenállása

Dobosy

2020

MDT

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Jelen kutatómunka célja S690QL és S960M alapanyagok és védőgázos fogyóelektródás ívhegesztett kötéseik fáradásos repedésterjedéssel szembeni ellenállásainak meghatározása. A hegesztési kísérletek 15 mm vastag alapanyagokon lettek végrehajtva, szimmetrikus X kötéskialakítást alkalmazva. A paraméterek állandósága érdekében hegesztő szekátort alkalmaztunk, illetve WeldQAS folyamatfelügyelő rendszer segítségével ellenőriztük a hegesztési paramétereket. A repedésterjedési próbatestek a jellemző irányokra merőlegesen illetve azokkal párhuzamosan lettek kimunkálva, mind az alapanyag, mind a hegesztett kötések esetében, illetve ez utóbbi próbatestek során a bemetszések helyzetét is változtattuk. Ennek megfelelően a vizsgálataink során terjedő repedések a valós szerkezetekben előforduló és megjelenő, különböző repedés megjelenési helyeknek felelnek meg. A vizsgálati eredmények megfelelő módon kiválasztott értékinek felhasználásával egy statisztikai módszer javasolható a fáradásos repedésterjedéssel szembeni ellenállás meghatározására.

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“…Based on the experimental data and results, fatigue crack propagation limit curves can be determined. Generally, the determination of the fatigue design curves consists of six steps, as follows [20]. First step: determination of measuring values, the threshold stress intensity factor , at a level of significance ε = 0.05.…”

Section: Fatigue Crack Propagation Limit Curvesmentioning

confidence: 99%

Matching effect on fatigue crack growth behaviour of high-strength steels GMA welded joints

Lukács

Dobosy

2019

Weld World

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The objective of the paper is to study the influence of the mismatch effect on high-strength steels and to determine fatigue crack propagation design curves. In order for determination and comparison of the fatigue resistance, fatigue crack growth tests were performed on S690QL, S960QL quenched and tempered, and S960M thermomechanically rolled high-strength steels. Fifteenmillimeter-and 30-mm-thick base materials were used for our investigations. Welded joints were made from these base materials, using gas metal arc welding with matching, overmatching, and undermatching filler metals. In the paper, the performance of the welding experiments will be presented, especially with the difficulties of the filler material selection; along with the results of the fatigue crack growth examinations executed on the base materials and its welded joints. Statistical aspects were applied both for the presenting of the possible locations of the cracks in the base materials and the welded joints and for the processing of the measured data. Furthermore, the results will be compared with each other, and the possibility of derivation of fatigue crack propagation design or limit curves will be referred.

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Fatigue Crack Propagation Limit Curves for Different Metallic and Non-Metallic Materials

Cited by 18 publications

References 0 publications

Fatigue crack growth tests on type 321 austenitic stainless steel in corrosive environment and at elevated temperature

Fatigue crack growth tests on type 321 austenitic stainless steel in corrosive environment and at elevated temperature

S690QL és S960M nagyszilárdságú acélok hegesztett kötéseinek fáradásos repedésterjedéssel szembeni ellenállása

Matching effect on fatigue crack growth behaviour of high-strength steels GMA welded joints

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