超星 - quiz-11 - 查题吧

单选题

The flexibility of the compression bar intensively reflects which factors of the compression bar will affect the critical stress.

A. Length, constraints, section size and shape
B. Material, length and constraints
C. Material, constraints, section size and shape
D. Material, length, section size and shape

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单选题

Which measure can not improve the stability of slender compression bar.

A. Increase the cross-sectional area of the compression bar
B. Increase the surface finish of the compression bar
C. Reduce the flexibility of the compression bar
D. Materials with large elastic modulus shall be selected

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单选题

Buckling of the strut will occur in the longitudinal plane of ().

A. Maximum length factor
B. Minimum section inertia radius
C. Maximum flexibility
D. Minimumflexibility

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单选题

The compression bar belongs to a slender bar. Whether it is a medium long bar or a short thick bar is determined according to the () of the compression bar.

A. length
B. Cross section size
Critical stress
D. flexibility

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单选题

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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单选题

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

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单选题

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

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单选题

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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单选题

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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单选题

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

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