Analyse van het insnoerverschijnsel bij vlakke deformatie van plaat

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Analyse van het insnoerverschijnsel bij vlakke deformatie van

plaat

Citation for published version (APA):

Houtackers, L. J. A. (1975). Analyse van het insnoerverschijnsel bij vlakke deformatie van plaat. (TH Eindhoven. Afd. Werktuigbouwkunde, Laboratorium voor mechanische technologie en werkplaatstechniek : WT rapporten; Vol. WT0352). Technische Hogeschool Eindhoven.

Document status and date: Gepubliceerd: 01/01/1975

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...-'--~'-'-'--'--~ .. ---.. ----..

techniache hog.school eindhoven vakgtoep produktietechnologlc

rapport van de .ectie: _{Omvormtechnologie} titer:

ANALYSE VAN HET INSNOERVERSCHIJNSEL BIJ VLAKKE DEFORMATIE VAN PLAAT.

auteur(.): L.J.A. Houtackers sectieleid.,: J • A. G. Ka 1 s fbl;~' walsh blZ·l T rapport nr.0352 codering: i ttefwoord:

I

Insnoerverschijn-sel vlakke de- !

format i evan pI aat.

I

I hoogleraar: lamenvottina P.C. Veenstra '

I

~---J

I·,r--

=.c.:;;;.::~--~'---'---+II-·!l'

II! In deze studie wordt een model opgezet voor het insnoerverschijnsel (2 dim.) bij v1akke deformatie van plaat onder inv10ed van een trekkr acht in 1angsrichting. Uitgaande va~ een ! evenwicntsbeschOlMing is m.b.v. de Levy-von Mises verge1 ijkingen en de vloeivoorwaarde volgens von Mises de spanningstoestand als funktie va~ de insnoergeometrie voor de kleinste doorsnede ganalyseerd.

! Uit deze geometrie is een korrektiefaktor CL afgeleid, (analoog aan de korrektiefaktor vol-gens Brid~man voor ronde en rechthoekige trekstrip: C

So resp. C8~) welke de effektleve spanning a in de kleinste doorsnede relateert aan de gemiddelde spanning in

trekrich-ting. gem

Voorts zijn er kanttekeningen geplaatst bij de analyses door Bridgman. De spanningskomponen-ten, gerelateert aan de vloeispanning -, zijn als funktie van de geoemtrie van de kleinste doorsnede (X/a) met (a/R) als parameter weergegeven. Verder is een 1 iteratuurstudie uitge-voerd over Mogel ijke breukkriteria.

I ,

' OPMERKING

Het opzet ten van een "ana 1 oog" mode I voo r gebogen pI aa t en daa rb i j na te gaan \~e 1 ke i nv 1 oed een kerf (met straal R) aan de buitenzijde van de buigzone en de plaatdikt6 5 op de

I spanningsverdel ing over de kleinste doorsnede van deze plaat hebben (met a al~ funktie

L van de plaats in dikterichting) dient als completering van deze studie nog te vol gen. J

progno.e

Het opzetten van een fundamenteel model, het opsporen van para-meters die bij breuk een rol spelen, het nagaan welke parapara-meters een bepaald "type" breuk stimuleren en het onderzoeken van de gevoeligheid van deze parameters zou een zinvol Ie inhoud van een nader onderzoek kunnen zijn.

datum: maart 1975 aantal biz. 54 igesc:hikt voor

I

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Nog niet voor. pub 1 i ka tie of

!

ex~~rne afg i ftle

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