Ïðåäñòàâëåíû ðåçóëüòàòû ðàñ÷åòíî-ýêñïåðèìåíòàëüíîãî àíàëèçà âëèÿíèÿ òåìïåðàòóðû íà ìåõàíè÷åñêèå ñâîéñòâà âûñîêîïðî÷íîé êîíñòðóêöèîííîé ñòàëè S690QL. Îïðåäåëåíà ìàêñèìàëüíàÿ òåìïåðàòóðà ïðè ñòàòè÷åñêèõ èñïûòàíèÿõ íà ðàñòÿaeåíèå, ïðè êîòîðîé äàííàÿ ñòàëü ñîõðàíÿåò âûñîêèå ìåõàíè÷åñêèå õàðàêòåðèñòèêè. Ñòàòè÷åñêèå èñïûòàíèÿ íà ðàñòÿaeåíèå ïðîâîäèëèñü ïðè ïÿòè ðàçëè÷íûõ òåìïåðàòóðàõ â äèàïàçîíå 20…550°Ñ. Ïîëó÷åííûå ýêñïåðèìåíòàëüíûå äàííûå ñðàâíèâàëèñü ñ ðåçóëüòàòàìè êîíå÷íîýëåìåíòíûõ ðàñ÷åòîâ ïóòåì ïîñòðîåíèÿ ñîîòâåòñòâóþùèõ êðèâûõ óïðî÷íåíèÿ ñòàëè.Êëþ÷åâûå ñëîâà: ñòàëü S690QL, òåìïåðàòóðà, ìåõàíè÷åñêèå ñâîéñòâà, êîíå÷íîýëåìåíòíûé ÷èñëåííûé àíàëèç, ýêâèâàëåíòíîå íàïðÿaeåíèå, ýôôåêòèâíàÿ äåôîðìàöèÿ.Introduction. With constant advancements in the field of construction engineering, there is a growing need for high strength construction steels such as the steel grade S690QL, which is analyzed in this paper. These steels should have good mechanical properties which would make the construction reliable and light. The steel grade S690QL is used for producing high responsible constructions such as cranes, dynamic loaded parts for millitary vehicles and battle assemblies, etc [1]. When complex constructions are made, especially the ones made of steels of wide cross sections, the steel is often heated (preheated, additionally heated and tempered), and the process engineers and designers often find themselves in a dilemma concerning the maximum temperatures allowed for this process. In the literature, wide ranges of these temperatures can be found, depending on the thickness. The aim of this paper is to determine experimentaly and numericaly the maximum working temperatures at which S690QL steel keep thier high strength values.In order to determine dependance of mechanical properties of the S690QL steel on the temperature, numerous investigations has been carried out [2][3][4][5][6][7]. Most of the investigations dealt with properties of base metal S690QL, but some papers show results of investigation of welded joints made of mentioned steel [2]. The aim of investigations was to determine
This paper presents a method for implicit stress integration of the
Drucker-Prager material model with kinematic hardening. The stress
integration of the material model is conducted using the incremental
plasticity method, while the kinematic hardening of material is defined using
nonlinear Armstrong-Frederick hardening. This type of granular material
hardening occurs as a consequence of the cyclic loading effects, such as the
seismic load. For this reason, this material model is used for the earthquake
analysis in the soil mechanics. Yield surface of the material model changes
its position under the cyclic loads in the stress space, whereas there is no
change in the size of the yield surface in deviatoric plane. The developed
algorithm of the material model has been implemented in the software package
PAK. [Projekat Ministarstva nauke Republike Srbije, br. TR37013 i br.
TR32036]
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