GEOMETRIC SIZE EFFECT IN RELATION TO THE FATIGUE LIFE OF S355J2+C STEEL UNDER VARIABLE BENDING CONDITIONS
Abstract eng: The fatigue tests are mainly carried out on the specimens with dimensions, which differ from actual tested items. Failure to allow for the item size in engineering practice can lead to significant errors in the assumed fatigue life of structural materials. The size effect is a complex phenomenon and no universal analytical or numerical models are currently available. The material strength decreases with the increase in size of the tested item subject to monotonic or fatigue loads. The reduction in strength is affected by the factors related to a random distribution of defects in the material, shape and type of load and the effects of technological processes during production. The study analyses the size effect in a geometrical approach. The test conditions (rotary bending) allow to estimate the stress gradient effect on the fatigue life. The tests were carried out on specimens to PN-H-04326 and specimens with reduced cross-sectional area (minispecimens).
Contributors:
Publisher:
Institute of Thermomechanics AS CR, v.v.i., Praha
Conference Title:
Conference Title:
Engineering Mechanics 2016
Conference Venue:
Svratka, CZ
Conference Dates:
2016-05-09 / 2016-05-12
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.
Record appears in:
Record created 2016-08-16, last modified 2016-08-16
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