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Design and Stress Analysis of Extraterrestrial ... - The Black Vault

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a<br />

a<br />

I<br />

a<br />

A4l "• dr; P= pr dr idy;<br />

AW =-P -- prdr d•!,<br />

2 2<br />

.1! (Q +-dQ) =(Q+ dQ7)(r +dr)dr d?.<br />

I" +Afd+oi4.)<br />

'"i<br />

Ill<br />

a .<br />

0<br />

0<br />

Fig. 2.50.<br />

(a/<br />

A plate element.<br />

(b)<br />

Projecting all forces acting 6ob the element (see Fig. 2.50a)<br />

onto the z-axis, we obtain<br />

S Qr do (Q +4QlQ(r + 'Ir) (kj -pr dy(r ,<br />

SI<br />

hence<br />

'II<br />

0167<br />

'pr. (2.57)<br />

I

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