A classroom teaching demonstration device for the stability of a slender compression rod

Abstract

The invention provides a long and thin pressing rod stability classroom teaching demonstrator. The long and thin pressing rod stability classroom teaching demonstrator comprises a demonstrator body support, a movable lever, a long and thin pressing rod to be tested, an inner supporting plate, hold-down mechanisms, a pressure providing device, a connecting rod, a side support, an L-shaped connecting plate, a connection rod, a steering device, a sliding plate and a pressure sensor. The C-shaped inner supporting plate is fixed into the demonstrator body support, grooves are formed both in the upper portion and the lower portion of the C-shaped inner supporting plate, the steering device is arranged on one side of the C-shaped inner supporting plate, and the upper portion and the lower portion of the C-shaped inner supporting plate are respectively fixedly provided with one hold-down mechanism, the pressure providing device is arranged above the hold-down mechanism on the upper portion of the C-shaped inner supporting plate, and the pressure sensor is arranged below the hold-down mechanism on the lower portion of the C-shaped inner supporting plate. Correctness of a calculation formula of critical pressure of the long and thin pressing rod is verified by stimulating axial compression of the two ends of the long and thin rod under different constraint conditions and observing a steady state skew curve of the pressing rod under critical pressure, and therefore students can conveniently understand the deduction process of correlation formulae.

Description

technical field [0001] The invention relates to the field of classroom teaching experiment demonstration equipment, in particular to a classroom teaching demonstration device for the stability of a slender pressure rod. Background technique [0002] Mechanics of materials is relatively abstract. The research method usually used in this subject is to draw reasonable assumptions through experimental phenomena, and derive practical calculation formulas from the assumptions. The correctness of the formulas must be verified in experiments. Because it is too abstract, the experiments are very complicated. , it is difficult for students to understand during learning, so if there are corresponding classroom teaching experiment demonstration equipment to demonstrate it, it can greatly reduce the difficulty of students' understanding and improve learning efficiency. [0003] Among them, the following formula is given in the textbook for the critical pressure of the slender compression...

AI Technical Summary

Problems solved by technology

[0009] In the process of deriving the critical pressure formula of slender compression rods, when the rod end constraints are different, the bending moment M on the cross section can sometimes be ignored, and sometimes it cannot be ignored. This is often difficult for students to understand, so there is an urgent need for a device to simulate slender The axial compression under different constraints at both ends of the rod is used to observe the steady-state deflection line of the compression rod at the critical pressure, and to verify the correctness of the calculation formula for the critical pressure of the slender compression rod

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