Round section compression bar hinged at both ends, 1m long and 50mm in diameter. Its flexibility is ()
A. 60
B. 66.7
C. 80
D. 50
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For slender compression bars, (), the critical stress σ the bigger.
A. The larger the elastic modulus E or the smaller the flexibility λ
B. The larger the elastic modulus E or the larger the flexibility λ
C. The smallerthe elastic modulus E or thelarger the flexibility λ
The critical stress σcrof compression bar In the conclusion, () is correct.
A. The value of slender rod σcris independent of the material of the rod
B. The value of medium long rodσcris independent of the material of the rod
C. The value ofmedium long rodσcris independent of the flexibility of the rod
D. The value ofthick short rodσcris independent of theflexibilityof the rod
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
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
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