Î ÄÈÑÑÈÏÀÒÈÂÍÎÉ ÔÓÍÊÖÈÈ ÏÐÈ ÒÐÀÍÑËßÖÈÎÍÍÎÉ ÀÍÈÇÎÒÐÎÏÈÈ ÏÐÈ ÊÐÓ×ÅÍÈÈ

 

Àííîòàöèÿ.  ðàáîòå ðàññìàòðèâàåòñÿ äèññèïàòèâíàÿ ôóíêöèÿ ïðè òðàíñëÿöèîííîì íàïðÿæåíèè ïðè êðó÷åíèè.

Êëþ÷åâûå ñëîâà: íàïðÿæåíèå, äåôîðìàöèÿ, ïðåäåë òåêó÷åñòè, êðó÷åíèå, ïàðàìåòðû àíèçîòðîïèè, äèññèïàòèâíàÿ ôóíêöèÿ.

 

         1. Ðàññìîòðèì óñëîâèå ïëàñòè÷íîñòè èëè ïðåäåëüíîãî ñîñòîÿíèÿ â ñëó÷àå êðó÷åíèÿ âèäà

                                       .                                                  (1.1)

          äàëüíåéøåì ïåðåéäåì ê áåçðàçìåðíûì âåëè÷èíàì è îòíåñåì âñå âåëè÷èíû, èìåþùèå ðàçìåðíîñòü íàïðÿæåíèé, ê âåëè÷èíå . Óñëîâèå (1.1) ïðèìåò âèä

                                       .                                                  (1.2)

         Î÷åâèäíî, (1.2) ïðåäñòàâëÿåò óðàâíåíèå ýëëèïñà (ðèñ.1) ñ öåíòðîì  è ïîëóîñÿìè , .

 

 

 

 

Ðèñ. 1

Ñîãëàñíî àññîöèèðîâàííîìó çàêîíó ïëàñòè÷åñêîãî òå÷åíèÿ êîìïîíåíòû ñêîðîñòè äåôîðìàöèè èìåþò âèä

                                      , .                                                       (1.3)

Èç (1.2), (1.3) ñëåäóåò

                               , .                                            (1.4)

         Îòñþäà

                                    ,                                                                 (1.5)

                                         .                                                                (1.6)

         Òîãäà

                                         ,                                                          (1.7)

                                         .                                                          (1.8)

Ñîãëàñíî (1.7), (1.8) ïîëó÷èì

                              .                                          (1.9)

         Èç (1.2), (1.9) èìååò ìåñòî óðàâíåíèå

                                        .                                                            (1.10)

         Èç (1.10) íàéäåì

                                            .                                                          (1.11)

         Äèññèïàòèâíàÿ ôóíêöèÿ îïðåäåëÿåòñÿ ñîãëàñíî

                                         .                                                            (1.12)

         Èç (1.5), (1.6) ñëåäóåò

                                           ,                                                               (1.13)

                                            .                                                              (1.14)

         Òîãäà

                                         ,                                                          (1.15)

                                         .                                                         (1.16)

         Èç (1.12), (1.15), (1.16) ïîëó÷èì

                                   .                                             (1.17)

         Ñîãëàñíî (1.11), (1.17) äèññèïàòèâíàÿ ôóíêöèÿ èìååò âèä

                              .                                                 (1.18)

2. Ðàññìîòðèì óñëîâèå ïëàñòè÷íîñòè èëè ïðåäåëüíîãî ñîñòîÿíèÿ â ñëó÷àå êðó÷åíèÿ âèäà

                               .                                                  (2.1)

          äàëüíåéøåì ïåðåéäåì ê áåçðàçìåðíûì âåëè÷èíàì è îòíåñåì âñå âåëè÷èíû, èìåþùèå ðàçìåðíîñòü íàïðÿæåíèé, ê âåëè÷èíå . Óñëîâèå (2.1) ïðèìåò âèä

                                    .                                                   (2.2)

Î÷åâèäíî, (2.2) ïðåäñòàâëÿåò óðàâíåíèå ýëëèïñà (ðèñ.2) ñ öåíòðîì  è ïîëóîñÿìè , .

 

 

 

 

 

Ðèñ. 2

Ñîãëàñíî àññîöèèðîâàííîìó çàêîíó ïëàñòè÷åñêîãî òå÷åíèÿ êîìïîíåíòû ñêîðîñòè äåôîðìàöèè èìåþò âèä

                                    , .                                                       (2.3)

Èç (2.2), (2.3) ñëåäóåò

                              , .                                         (2.4)

         Îòñþäà

                                   ,                                                               (2.5)

                                  .                                                               (2.6)

Ñîãëàñíî (2.5), (2.6) ïîëó÷èì

                        .                                         (2.7)

         Èç (2.2), (2.7) èìååò ìåñòî óðàâíåíèå

                                   .                                                            (2.8)

         Èç (2.8) íàéäåì

                                    .                                                             (2.9)

         Èç (2.5), (2.6) ñëåäóåò

                                     ,                                                          (2.10)

                                           .                                                         (2.11)

         Òîãäà

                                ,                                                      (2.12)

                                .                                                     (2.13)

         Èç (1.12), (2.12), (2.13) ïîëó÷èì

                             .                                           (2.14)

         Ñîãëàñíî (2.9), (2.14) äèññèïàòèâíàÿ ôóíêöèÿ èìååò âèä

                                   .                                                (2.15)

 

ËÈÒÅÐÀÒÓÐÀ

 

1. Èâëåâ, Ä. Ä. Òåîðèÿ ïðåäåëüíîãî ñîñòîÿíèÿ è èäåàëüíîé ïëàñòè÷íîñòè : èçáðàííûå ðàáîòû /    Ä. Ä. Èâëåâ. – Âîðîíåæ : Âîðîíåæñêèé ãîñóäàðñòâåííûé óíèâåðñèòåò, 2005. – 357 ñ.