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Blz. 22-38
Laat het segment AC de x-as voorstellen in de oorspronkelijke staat van druk.
Wanneer u de staat van druk wilt bepalen voor de assen x’-y’, met de klok mee
gedraaid volgens een hoek
φ
ten opzichte van de oorspronkelijke assen x-y,
teken dan segment A’B’, gecentreerd in C en met de klok mee gedraaid volgens
een hoek
ten opzichte van segment AB. De coördinaten van punt A’ zullen
de waarden (σ
xx
,τ
xy
) geven, terwijl die van punt B’ de waarden (σ
yy
,τ
xy
)
zullen geven.
De voorwaarde waarvoor de schuine druk, τ
xy
, gelijk is aan nul, aangegeven
door segment D’E’, geeft de zgn. voornaamste drukpunten σ
P
xx
(bij punt D’) en
σ
P
yy
(bij punt E’). Om de voornaamste drukpunten te verkrijgen, moet u het
coördinatenstelsel x’-y’ tegen de klok in draaien volgens een hoek
φ
n
ten
opzichte van het systeem x-y. Bij de cirkel van Mohr meet de hoek tussen de
segmenten AC en D’C 2
φ
n
.
De voorwaarde waarvoor de schuine druk τ
xy
, het maximum is, wordt
aangegeven door segment F’G’. Onder deze voorwaarden zijn beide normale
drukpunten, σ
xx
= σ
yy
gelijk. De hoek die overeenkomend komt met deze
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