Synergy of crack closure, near-tip residual stress and crack-tip blunting in crack growth under periodic overloads – A fractographic study; International Journal of Fatigue; Vol. 93, pt. 1

Synergy of crack closure, near-tip residual stress and crack-tip blunting in crack growth under periodic overloads – A fractographic study; International Journal of Fatigue; Vol. 93, pt. 1

Opis bibliograficzny
Parent link:International Journal of Fatigue: Scientific Journal.— , 1979-
Vol. 93, pt. 1.— 2016.— [P. 18-29]
Korporacja: Национальный исследовательский Томский политехнический университет (ТПУ) Институт физики высоких технологий (ИФВТ) Кафедра материаловедения в машиностроении (ММС)
Kolejni autorzy: Ramasubbu S. Sunder, Byakov A. V. Anton Viktorovich, Eremin A. V. Alexandr Vyacheslavovich, Panin S. V. Sergey Viktorovich
Streszczenie:Title screen
Fatigue crack growth tests were performed on an Al-Cu alloy under specially designed load sequences with a periodic overload cycle. These overloads were either immediately followed by or preceded by underloads of controlled magnitude. Baseline loading magnitude was designed to induce near-threshold conditions well below the Paris Regime. The fatigue fracture surfaces obtained from the tests were subject to fractographic analysis. The study shows that irrespective of their magnitude, underloads preceding tensile overloads do not affect crack growth rate after the overload. However, if the underload follows an overload, it carries a deleterious effect on retardation, whose magnitude is determined by the extent to which the underload drops below baseline cycling level. In either case, observed effects do not seem to have anything to with crack closure, but rather, are attributable to the effect of underloads on near-tip residual stress during baseline cycling that in turn controls threshold stress intensity range. Post-overload crack closure is reduced by crack-tip blunting, but rapidly recovers.
Режим доступа: по договору с организацией-держателем ресурса
Język:angielski
Wydane: 2016
Hasła przedmiotowe:
электронный ресурс
труды учёных ТПУ
near threshold fatigue
near-tip residual stress
crack closure
crack-tip blunting/re-sharpening
variable-amplitude loading
остаточные напряжения
трещины усталости
амплитуда
нагружение
Dostęp online:http://doi.org/10.1016/j.ijfatigue.2016.08.004
Format: Elektroniczne Rozdział
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=654062

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