CN102426807A

CN102426807A - Combination deformation mechanics experiment apparatus

Info

Publication number: CN102426807A
Application number: CN2011103418519A
Authority: CN
Inventors: 侯德门; 赵挺; 殷民; 刘光远; 黄莺; 徐志敏
Original assignee: Xian Jiaotong University
Current assignee: Xian Jiaotong University
Priority date: 2011-11-02
Filing date: 2011-11-02
Publication date: 2012-04-25
Anticipated expiration: 2031-11-02
Also published as: CN102426807B

Abstract

A combination deformation mechanics experiment apparatus is disclosed. One end of a thin walled tube is fixed on a vertical arm of a rack so as to form a solid supported end. A first ball bearing is sleeved on the thin walled tube. An upper surface and a lower surface of the thin walled tube are sticked with strain rosettes respectively. A cantilever end of the thin walled tube fixes a sector framework. An upper vertex angle of the sector framework is clamped with a flexible cable, a flexible cable tandem connection tension sensor and a spinning wheel loading mechanism. A lower end is fixed on a pedestal of the rack. A stud, whose height can be adjusted continuously, is arranged under the first ball bearing. A double U-shaped position of the stud is provided with two second ball bearings. The stud and a spinning wheel are spinningly connected to a support. A spacing taper pin is installed on the support and is guided into a spacing chute of the stud. By using the apparatus of the invention, multiaspect experiment projects can be realized. There are a plurality of mechanics model boundary conditions, many kinds of test conditions, various kinds of test schemes and changeable group bridge forms. A design is novel and reasonable. A structure is compact. Operation and usage are convenient. The apparatus has many other advantages.

Description

A kind of combined deformation Experiments of Machanics device

Technical field

The present invention relates to the Experiments of Machanics technical field, particularly relate to a kind of combined deformation Experiments of Machanics device.

Background technology

Present existing combined deformation Experiments of Machanics method and apparatus mostly only limits to traditional statically determinate structure combined deformation, and its mechanical model is single, the test operating mode is single, content measurement is analyzed single.

Summary of the invention

In order to overcome the defective of above-mentioned prior art; The object of the present invention is to provide a kind of combined deformation Experiments of Machanics device; Can realize that mechanical model is multiple, test operating mode multiclass, various, the changeable comprehensive Design property experiment of group bridge form of testing scheme, cultivate, excite the student to the deep thinking of evaluation of combined deformation structural-load-carrying capacity and optimal design principle and understand the meaning that the aspect has positive important for strengthening student's integrated practice ability.

In order to achieve the above object, technical scheme of the present invention is achieved in that

A kind of combined deformation Experiments of Machanics device; Comprise stand 5; end of thin walled tube 1 forms solid Zhi Duan with pair bolted on the upright arm 14 of stand 5, on the cross section of the thin walled tube 1 of holding 2/3 place apart from solid, closely be set with first ball bearing 3, one piece of rectangular rosette 2 is respectively pasted on the upper and lower surface of 1 two varying cross-sections of thin walled tube between the solid Zhi Duan and first ball bearing 3; another cantilever end of thin walled tube 1 is fixed fan-shaped framework 4; the last drift angle of fan-shaped framework 4 fixes has gentle rope 6, and gentle rope 6 is connected in series pulling force sensors 7 and spinning roller formula load maintainers 8, and rope 6 lower ends that soften are anchored on the base of stand 5; below of first ball bearing 3 is provided with the double-screw bolt 10 that height can be regulated continuously; dual U-shaped place, double-screw bolt 10 upper end is provided with two second ball bearing 9, and double-screw bolt 10 is rotatably connected on the bearing 13 with spinning roller 11, and spacing taper pin 12 is installed on the bearing 13 and imports in the limit sliding chutes of double-screw bolt 10.

The present invention has constituted multi-form static indeterminacy/statically determinate structure combined deformation Experiments of Machanics device, can leave many-sided experimental project respectively, as: statically determinate structure flexion torsion combined deformation Experiments of Machanics; Just contact or excessive contact or owe to contact statically indeterminate structure flexion torsion combined deformation Experiments of Machanics; Pure torsional deflection Experiments of Machanics.During experiment; Require the autonomous Design experimental program by the student according to experiment purpose and content measurement fully; To each test operating mode; With the good TCH test channel binding post that inserts the stress-strain tester that is placed on the experimental provision next door of signal wire of strain rosette, two half-bridges and two full-bridges that winding successively is of practical significance are so that measure normal stress and the shearing stress component under the corresponding operating mode respectively.This invention had both had that the mechanical model boundary condition is multiple, test operating mode multiclass, testing scheme is various, group bridge form is changeable, also had novel and reasonable design, compact conformation, advantage such as easy for operation.Especially cultivate, excite the student to the deep thinking of evaluation of combined deformation structural-load-carrying capacity and optimal design principle and understand the meaning that the aspect has positive important for strengthening student's integrated practice ability.

Description of drawings

Fig. 1 is a perspective view of the present invention.

Fig. 2 is a front view of the present invention.

Fig. 3 is a side view of the present invention.

Embodiment

Below in conjunction with accompanying drawing structural principle of the present invention and principle of work are described in detail.

A kind of combined deformation Experiments of Machanics device; Comprise stand 5; end of thin walled tube 1 uses two bolted on the upright arm 14 of stand 5, to form solid Zhi Duan; on the cross section apart from the thin walled tube 1 that props up end 2/3 place admittedly, closely be set with first ball bearing 3, and one piece of rectangular rosette 2 is respectively pasted on the upper and lower surface of 1 two varying cross-sections of thin walled tube between the solid Zhi Duan and first ball bearing 3, pass through key and bolt on another cantilever end of thin walled tube 1 fan-shaped framework 4 is fixed; the last drift angle fixing of fan-shaped framework 4 has gentle rope 6; gentle rope 6 serial connection pulling force sensors 7 and spinning roller formula load maintainers 8 that rope 6 lower ends that soften are anchored on the base of stand 5, the below of first ball bearing 3 is provided with the double-screw bolt 10 that highly can regulate continuously; dual U-shaped place, double-screw bolt 10 upper end is provided with two second ball bearing 9, makes two second identical, the middle faces of ball bearing 9 apical side heights remain in the same plane; Double-screw bolt 10 is rotatably connected on the bearing 13 with spinning roller 11, and spacing taper pin 12 is installed on the bearing 13 and imports in the limit sliding chutes of double-screw bolt 10, and when preventing the adjustment height, the dual U-shaped place of double-screw bolt 10 upper ends rotates.

Principle of work of the present invention is:

Do not contact the circular arc of first ball bearing 3 or fan-shaped framework 4 when two second ball bearing 9; Can realize statically determinate structure flexion torsion combined deformation Experiments of Machanics, the TCH test channel binding post of the good insertion force strain testing of the strainometer signal wire appearance in selected two pieces of strain rosettes 2, two half-bridges of winding successively and two full-bridges; When load is zero; The Magnetic gauge stand of displacement transducer stably is positioned on the stand 5, again the contact of displacement transducer vertically well is contacted with top side location on the circular arc of fan-shaped framework 4, implement displacement, power and strain zero clearing; Rotation load maintainer 8 imposed loads are measured normal stress and shearing stress component respectively; Regulate two second ball bearing 9 when rotation hand wheel 11 and just be in first ball bearing 3 and contact (or excessive contact or owe to contact); Can realize statically indeterminate structure flexion torsion combined deformation Experiments of Machanics; When successively same two half-bridges of winding and two full-bridges, load are zero, implement displacement, power and strain zero clearing; Rotation load maintainer 8 imposed loads are measured normal stress and shearing stress component respectively; When just being in the arc position of fan-shaped framework 4, two second ball bearing 9 of rotation hand wheel 11 adjustings contact; Can realize pure torsional deflection Experiments of Machanics; When successively same two half-bridges of winding and two full-bridges, load are zero, implement displacement, power and strain zero clearing; Rotation load maintainer 8 imposed loads are measured normal stress and shearing stress component respectively.Carry out static indeterminacy/statically determinate structure combined deformation Experiments of Machanics and respectively test operating mode; Measure and calculate the corresponding strain value of difference of twice different loads respectively; Confirm experimental result according to plane principle stress calculation relational expression; And the result of analysis and more different mechanical models, test operating mode, testing scheme and group bridge form; Dangerouse cross-section position in conjunction with thin walled tube 1 changes, variant changes, can bear situation such as the maximum load value improves, maximum defluxion reduces, and differentiates the principle that key element that its evaluation on bearing capacity relates to and optimal design parameter are chosen.

Claims

1. combined deformation Experiments of Machanics device; Comprise stand (5), it is characterized in that an end of thin walled tube (1) is gone up in the upright arm (14) of stand (5) with two bolted and formed solid Zhi Duan; On cross section, closely be set with first ball bearing (3) apart from the thin walled tube (1) of consolidating Zhi Duanyue 2/3 place; One piece of rectangular rosette (2) is respectively pasted on the upper and lower surface of (1) two varying cross-section of thin walled tube between solid Zhi Duan and first ball bearing (3), and another cantilever end of thin walled tube (1) is fixing with fan-shaped framework (4), and the last drift angle of fan-shaped framework (4) fixes has gentle rope (6); Gentle rope (6) serial connection pulling force sensor (7) and spinning roller formula load maintainer (8); Gentle rope (6) lower end is anchored on the base of stand (5), and the below of first ball bearing (3) is provided with the double-screw bolt (10) that height can be regulated continuously, and dual U-shaped place, double-screw bolt (10) upper end is provided with two second ball bearing (9); Double-screw bolt (10) is rotatably connected on the bearing (13) with spinning roller (11), and spacing taper pin (12) is installed on bearing (13) and goes up and import in the limit sliding chutes of double-screw bolt (10).