Prevalent Mode II Fracture Investigation of VO-Notched Specimens Made of Tungsten–Copper Functionally Graded Materials

Abstract

 ñòàòüå ýêñïåðèìåíòàëüíî è òåîðåòè÷åñêè èçó÷åí ïðåîáëàäàþùèé ðåaeèì ðàçðóøåíèÿ îáðàçöîâ ñ V-îáðàçíûìè íàäðåçàìè ñ êîíöåâûìè îòâåðñòèÿìè (VO-îáðàçíûå íàäðåçû) èç ôóíêöèîíàëüíî-ãðàäèåíòíîãî ìàòåðèàëà ñîñòàâà WCu. Îáðàçöû èçãîòàâëèâàëè ìåòîäîì ïîðîøêîâîé ìåòàëëóðãèè. Èñïûòàíèÿ íà ðàçðóøåíèå âîëüôðàì-ìåäíûõ îáðàçöîâ ñ VO-îáðàçíûì íàäðåçîì ïðè íàãðóaeåíèè ïðåèìóùåñòâåííî ïî òèïó II ïðîâîäèëè äëÿ ðàçëè÷íûõ çíà÷åíèé ðàäèóñà âåðøèíû íàäðåçà è åãî ãëóáèíû. Âåëè÷èíó ðàçðóøàþùåé íàãðóçêè îáðàçöîâ ñ VO-îáðàçíûì íàäðåçîì â óñëîâèÿõ ïðåîáëàäàþùåãî ðåaeèìà íàãðóaeåíèÿ îïðåäåëÿëè íà îñíîâå êðèòåðèÿ ïëîòíîñòè ýíåðãèè äåôîðìàöèè, óñðåäíåííîé ïî çàäàííîìó êîíòðîëüíîìó îáúåìó. Èçó÷åíî âëèÿíèå ðàäèóñà âåðøèíû, ãëóáèíû è óãëà ðàñêðûòèÿ íàäðåçà íà âåëè÷èíó ðàçðóøàþùåé íàãðóçêè. Ïîëó÷åííûå ðåçóëüòàòû ïîäòâåðaeäàþò ïðèìåíèìîñòü òåîðèè ïëîòíîñòè ýíåðãèè äåôîðìàöèè äëÿ èçó÷åíèÿ ðàçðóøåíèÿ îáðàçöîâ ãðàäèåíòíûõ ìàòåðèàëîâ ñ VO-îáðàçíûì íàäðåçîì â óñëîâèÿõ ïðåîáëàäàþùåãî ðåaeèìà íàãðóaeåíèÿ.Êëþ÷åâûå ñëîâà: ôóíêöèîíàëüíî-ãðàäèåíòíûå ìàòåðèàëû, âîëüôðàì, ìåäü, VO-îáðàçíûé íàäðåç, íàãðóaeåíèå òèïà II, ïëîòíîñòü ýíåðãèè äåôîðìàöèè