In this paper the results of bending fatigue studies on butt-welded pipes are presented and discussed. The original purpose of this investigation was to extend the existing fatigue database on butt-welded pipes from those of Markl's tests to the low-cycle fatigue range (100 to 2,000 cycles), using 1.5'' (38 mm) Schedule 80 pipe and comparing the measured fatigue strength with analytical formulations developed and put forth by Markl. Fatigue studies were also performed on 4.0'' (100 mm) Schedule 40 pipe. The earlier study by Markl covered the range from 2,000 to 4 x 106 cycles, with only two data points below 2 x 103 cycles. The effects of pipe size and field welds on fatigue strength of butt-welded pipe is also examined. The butt-welded pipe specimens were deformed in beading using two different four-point bending test fixtures designed and fabricated exclusively for this study. All testing was conducted under constant cyclic alternating displacement amplitudes about a zero mean value. Force versus deflection data was obtained in order to compare with the stress data obtained by Markl. Strain amplitudes were measured to provide the variation of strain with fatigue life for the butt-welded pipes.


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    Title :

    Fatigue of butt-welded steel pipes


    Contributors:


    Publication date :

    1998


    Size :

    31 Seiten, 13 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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