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A3

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Lösning

Som test, kan vi kontrollera att vi faktiskt har jämvikt:

\[\eqleft 20+10-20-10=0\]

Dvs ok!

Spänningsberäkningar

Spänning i snitten: (frilägger delen till vänster om varje snitt)

Snitt 1

\[\eqleft 20 -F_1 = 0 \qgives F_1 = 20\kN\]
\[\sigma_1 = \frac{F_1}{A} = \frac{20\cdot 10^3}{100\cdot 10^{-6}} = 200\MPa\]

Snitt 2

\[\eqleft 20+10-F_2=0 \qgives F_2 = 30\kN\]
\[\sigma_2 = \frac{F_2}{A} = \frac{30\cdot 10^3}{100\cdot 10^{-6}} = 300 \MPa\]
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