The instability of compression bar refers to the bar under axial pressure
A. The area of the local cross section changes rapidly
B. Yield or fracture of dangerous surface
C. Unable to maintain balance and move
D. Bending due to inability to maintain linear balance
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When the axial pressure P reaches the critical pressure Pcr, a slender compression rod is unstable after slight interference and is in micro bending equilibrium state. At this time, if the pressure P is relieved, the compression rod will be micro bending deformed
A. Completely disappear
B. remain unchanged
Continue to increase
Length factor in the following figure μ=
A. μ<0.7
B. 0.7<μ<1.0
C. 1.0<μ<2
D. μ>2
The slender rod bears the axial pressure P, and the critical pressure Pcrit of the rod is independent of
A. Material of rod
B. the length of rod
C. Pressure on rod
D. Shape of rod
When the materials are the same, with the increase of working flexibility,
A. The critical pressure of slender rod decreases, and the critical pressure of medium thick rod remains unchanged
B. The critical pressure of slender rod remains unchanged, and the critical pressure of medium thick rod decreases
C. The critical pressure of slender rod decreases, and that of medium thick rod decreases
D. The critical pressure of slender rod remains unchanged, and that of medium thick rod remains unchanged
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