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Samenvatting Overzicht van alle bewijzen die worden gevraagd op het examen sterkteleer $9.92   Add to cart

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Samenvatting Overzicht van alle bewijzen die worden gevraagd op het examen sterkteleer

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Dit is een samenvatting van alle bewijzen die worden gevraagd op het examen sterkteleer. Alle bewijzen zijn duidelijk uitgewerkt en moeten uit het hoofd gekend zijn (AJ 2023/24).

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  • September 21, 2024
  • 19
  • 2023/2024
  • Summary
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,Inhoud
1. Buiging van balken opgebouwd uit één materiaal ........................................................................... 3
1.1 Verloop van de normaalspanningen ........................................................................................ 3
1.2 Ligging van de neutrale vezel .................................................................................................. 4
1.3 Buigingsformule. ..................................................................................................................... 5
2. Buiging en afschuiving ..................................................................................................................... 6
2.1 Vormverandering : opstellen DVG elastische lijn ..................................................................... 6
2.2 Schuifspanningen in langs- en dwarsdoorsneden.................................................................... 7
2.3 Wet der wederkerigheid der schuifspanningen ....................................................................... 8
3. Traagheidsgrootheden................................................................................................................... 10
3.1 Verschuivingsformule voor axiaal traagheidsmoment Ix en Iy ............................................... 10
3.2 Verschuivingsformule voor traagheidsproduct Cxy ............................................................... 10
3.3 Verdraaiingsformule voor axiaal traagheidsmoment Ix en Iy ................................................. 11
3.4 Verdraaiingsformule voor traagheidsproduct Cxy ................................................................. 11
3.5 Hoofdtraagheidsmomenten Imin en Imax ............................................................................. 13
3.6 Cirkel van Mohr ..................................................................................................................... 14
4. Trek en druk................................................................................................................................... 15
4.1 Spanningen in een willekeurige doorsnede ........................................................................... 15
4.2 Relatieve volumeverandering ................................................................................................ 16
5. Afschuiving .................................................................................................................................... 18
5.1 Verband tussen de materiaalconstanten G,E en m................................................................ 18
6. Wringing ........................................................................................................................................ 19
6.1 Verband tussen 𝜏w en Mw ...................................................................................................... 19

, 1. Buiging van balken opgebouwd uit één materiaal
1.1 Verloop van de normaalspanningen




Wet van Hooke geldt :
𝜎 = 𝜀. 𝐸
Hypothese van Bernouilli :
“vlak blijft vlak”

R is de kromtestraal van de balk
|CC|=|CC’|= dx → neutrale vezel


In rust
|AA|=|BB|=|CC|= dx
Na aanleggen Moment MZ
|CC’|= dx = R . dα
|BB’| = dx + Δdx = ( R+y ) . dα

|𝐵𝐵 ′ | 𝑑𝑥+Δ𝑑𝑥 (𝑅+𝑦).𝑑𝛼
|𝐶𝐶 ′ |
= =
𝑑𝑥 𝑅.𝑑𝛼
Δ𝑑𝑥 𝑦
⇒1+ =1+
𝑑𝑥 𝑅
𝑦 Δ𝑑𝑥
⇒ 𝜀𝑥 = (𝜀𝑥 = )
𝑅 𝑑𝑥



Wet van Hooke :
e is de maximale afstand van de NV
𝜎𝑥 𝑦 𝑦 𝜎𝑥 𝑦
= ⇔ 𝜎𝑥 = 𝐸. =
𝐸 𝑅 𝑅
𝜎𝑚𝑎𝑥 𝑒
𝐸
𝜎𝑚𝑎𝑥 = .𝑒
𝑅

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