Wyniki wyszukiwania - Biblioteka Nauki

Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na https://bibliotekanauki.pl

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: allowable stresses

Sortuj według:

Ogranicz wyniki do:

Measurement method of grinding wheel's material strength properties

100%

Koziarski A. , Jaroniek M.

Postępy Technologii Maszyn i Urządzeń

1999

tom Vol. 23, nr 3

43-59

Investigations into material behaviour and mechanical propreties of selected grinding wheel materials are presented in the paper. The emphasis was layed on electrocorund wheels with ceramic binders. The followng parametrs were investigated: ultimate stresses in tension, compression and bending, respectively: Rm, Rc, Rg, Young modulus E and Poisson's ratio v, as well as stress intensity factors KV, Kic. The presentation of results is preceded by th review of applied research methods and of the used equippment.

W pracy przedstawiono badania własne dotyczące charakterystyki mechanicznych właściwości wybranych materiałów ściernic. Uwagę skupiono na ściernicach elektrokorundowych ze spoiwem ceramicznym. Badano parametry: Rm, Rc, Rg, E, V, KV, Kic. Opis uzyskanych wyników poprzedzono prezentacją zastosowanych metod badawczych i wykorzystanej aparatury.

Analysis of the nonstability states during bending processes of metallic tubes at bending machines. P. 1, Derivation of the basic expressions and relationships

100%

Śloderbach Z.

Engineering Transactions

2016

tom Vol. 64, iss. 3

311--330

In this paper the derivation of expressions for admissible values of strains and stresses for vertex points of layers subjected to tension during tube bending at bending machines is presented. The conditions of the dispersed and located loss of stability of the bent tube and the cracking criterion based on the technological index A5 (five fold sample) were assumed as criteria of instability. The original element of this paper is the extension of the criterion of strain location in a form of possible initiation of a neck or furrow (introduced by Marciniak for thin plates [1]) to bending thin- and thick-walled metal tubes at bending machines. Occurrence of loss of stability (especially that in a localised form) during tube bending can strongly reduce the service life. Thus, it is recommended to avoid such states during tube bending for elbows for pipelines or pipe installations.