CN201812403U

CN201812403U - Progressive and cumulative damage simulation demonstration apparatus

Info

Publication number: CN201812403U
Application number: CN2010205701471U
Authority: CN
Inventors: 林伟岸; 詹良通; 管铮; 陈云敏; 王顺玉; 闫旭; 樊苏璐; 黄艳
Original assignee: Zhejiang University ZJU
Current assignee: Zhejiang University ZJU
Priority date: 2010-10-19
Filing date: 2010-10-19
Publication date: 2011-04-27
Anticipated expiration: 2020-10-19

Abstract

The utility model discloses a progressive and cumulative damage simulation demonstration apparatus. Both ends of an aluminum alloy track are respectively provided with a control fixed pulley and a fixed pulley. The track is provided with three iron blocks for forming a sliding fit with the track. The front end of each iron block is respectively provided with a high-strength magnet. Each iron block is provided with a center hole. A guide cylinder is welded at one end of a first iron block, which is toward the fixed pulley and an electronic dynamometer is arranged in the hole of the first iron block. Sliding cylinders are respectively welded at both ends of a second iron block. After springs are respectively sleeved on the two sliding cylinders, the two sliding cylinders are inserted in the front and rear center holes. One end of the electronic dynamometer is fixed at one end of the guide cylinder. The other end of the electronic dynamometer is connected with a steel wire rope, then passes through the guide cylinder, the three iron blocks and the two sliding cylinders, is wound around the control fixed pulley, passes through the inside of the aluminum alloy track, is wound around the fixed pulley and finally is fixed on the guide cylinder. The progressive and cumulative damage simulation demonstration apparatus can observe the strain softening process of a single unit and the progressive and cumulative damage process of three units from local damage to general damage.

Description

A kind of analog demenstration instrument of progressive cumulative damage

Technical field

The utility model relates to a kind of experimental provision of measuring friction force, especially relates to a kind of analog demenstration instrument of progressive cumulative damage.

Background technology:

The progressive cumulative damage of earthen structure is the comparatively general and important failure mode of strain softening type rock-soil material, comprises that the side slope unstability and the foundation ditch of overconsolidation clay caves in, and landfill yard is along slippage of bottom liner system interface etc.Strain softening type rock-soil material mainly comprises overconsolidation clay, close sand, brittle rock and landfill pad system interface, its typical stress-strain relation generally can be divided into three phases (as shown in Figure 1) such as elastic stage, softening stress-displacement stage and remaining stage: elastic stage shear stress increases with strain, after reaching peak strength, enter softening stress-displacement stage, this moment, shear stress reduced with the strain increase, reach the remaining stage at last, shear stress remains unchanged.Progressive cumulative damage is the mechanical response of strain softening type rock-soil material a kind of complexity in loading procedure: produce uneven strain and stress when (1) loads in the earthen structure, cause rock soil mass shearing strength performance everywhere inconsistent; (2) destruction of each soil body unit is not produced simultaneously, but one is expanded gradually by local failure so that whole perforation the and form the process of destruction face.

Above-mentioned strain softening and progressive cumulative damage phenomenon can utilize this progressive cumulative damage simulated demonstration instrument to demonstrate out visually.

Summary of the invention

The purpose of this utility model is to provide a kind of progressive cumulative damage analog demenstration instrument, and it can demonstrate the whole process of three cell cubes progressive cumulative damage under the horizontal thrust effect visually.

The technical scheme that the utility model adopted is:

The utility model comprises the control fixed pulley, fixed pulley, electronic dynamometer, three iron blocks, three high strong magnets, two slide cartridges, two springs, aluminium alloy track, wire rope, guide cylinder; Control fixed pulley and fixed pulley are installed respectively at the two ends of aluminium alloy track, aluminium alloy track between control fixed pulley and fixed pulley is installed first iron block, second iron block and the 3rd iron block, the orienting lug and the formation of aluminium alloy track that are arranged on three iron block lower ends are slidingly matched, from first iron block of fixed pulley towards control fixed pulley direction, the front end of second iron block and the 3rd iron block is installed the first high strong magnet respectively successively, the second high strong magnet and the 3rd high strong magnet, three high strong magnets all are arranged on below the aluminium alloy track, first iron block, the center of second iron block and the 3rd iron block has the center pit of perforation, first iron block is towards the end welding guide cylinder of fixed pulley, guide cylinder is provided with electronic dynamometer in the hole, the two ends of second iron block are welded first slide cartridge and second slide cartridge respectively, the first slide cartridge external cylindrical surface inserts in the first iron block center pit after being with first spring, the second slide cartridge external cylindrical surface inserts in the 3rd iron block center pit after being with second spring, one end of electronic dynamometer is fixed on the end of guide cylinder near fixed pulley, the other end of electronic dynamometer connects wire rope, wire rope passes the guide cylinder endoporus successively, first iron block, first slide cartridge, second iron block, behind the center pit of second slide cartridge and the 3rd iron block, around the control fixed pulley, pass in the aluminium alloy track again and walk around fixed pulley, be buckled on the guide cylinder at last.

Described first iron block and second iron block head and the tail are at a distance of 80-100cm, and second iron block and the 3rd iron block head and the tail are at a distance of 50-70cm.

The beneficial effect that the utlity model has is:

1) iron block simulation soil body unit connects the interaction between the spring simulation soil body unit between the iron block.

2) shear stress of the friction force simulation soil body unit between the utility model utilization iron block and the track, and the strain softening of the change modeling soil body unit shear stress of friction force when changing: high strong magnet is fixed on aluminium alloy track inside with distance between magnet and the iron block, when iron block from far near when the magnet, suction between iron block and the track increases gradually, cause its friction force to increase gradually, when the iron block center arrives magnetic blow out centre, its friction force reaches maximal value, and this process is corresponding to the elastic stage in the stress-strain diagram; When iron block continued slippage forward, the suction between iron block and the track reduced gradually, caused its friction force also to reduce gradually, and this process is corresponding to the softening stress-displacement stage in the stress-strain diagram; Enough apart from being that the friction force between iron block and the track was reduced to stable kinetic force of friction when suction was zero between iron block and the magnet away from magnet when iron block, this process is corresponding to the remaining stage in the stress-strain diagram.

3) spring between electronic dynamometer and each iron block can record in the whole slipping acting force that three iron blocks bear jointly and the interaction force between each iron block.

4) shake strain softening process and three progressive cumulative damage processes that the unit destroys that handwheel can be observed individual unit from the local failure to integral body.

Description of drawings

Fig. 1 is the graph of a relation of shear stress and strain (or shear displacemant)

Fig. 2 is a structural principle front view of the present utility model.

Fig. 3 is the vertical view of Fig. 1.

Fig. 4 is the graph of a relation of thrust and shear displacemant.

Among the figure: 1, control pulley, 2, fixed pulley, 3, handwheel, 4, electronic dynamometer, 5, first iron block, 6, second iron block, 7, the 3rd iron block, 8, the first high strong magnet, 9, the second high strong magnet, 10, the 3rd high strong magnet, 11, first slide cartridge, 12, first spring, 13, second slide cartridge, 14, second spring, 15, the aluminium alloy track, 16, wire rope, 17, guide cylinder, 18, orienting lug.

Embodiment

The utility model is described in further detail below in conjunction with drawings and Examples.

As Fig. 2, shown in Figure 3, the utility model control fixed pulley 1, fixed pulley 2, electronic dynamometer 4, three 5,6,7, three high

strong magnet

11,13, two springs of 8,9,10, two slide cartridges of iron block (12,14), aluminium alloy track 15, wire rope 16, guide cylinder 17 and orienting lug 18.Control fixed pulley 1 and fixed pulley 2 are installed respectively at the two ends of aluminium alloy track 15, aluminium alloy track 15 between control fixed pulley 1 and fixed pulley 2 is installed first iron block 5, second iron block 6 and the 3rd iron block 7, the orienting lug and 15 formation of aluminium alloy track that are arranged on three iron block lower ends are slidingly matched, from first iron block 5 of fixed pulley 2 towards control fixed pulley 1 direction, the front end of second iron block 6 and the 3rd iron block 7 is installed the first high strong magnet 8 respectively successively, the second high strong magnet 9 and the 3rd high strong magnet 10, three high strong magnets all are arranged on below the aluminium alloy track 15, first iron block 5, the center of second iron block 6 and the 3rd iron block 7 has the center pit of perforation, first iron block 5 is towards the end welding guide cylinder 17 of fixed pulley 2, guide cylinder is provided with electronic dynamometer 4 in 17 holes, the two ends of second iron block 6 are welded first slide cartridge 11 and second slide cartridge 13 respectively, first slide cartridge, 11 external cylindrical surfaces are with first spring, 12 backs and insert in first iron block, 5 center pits, second slide cartridge, 13 external cylindrical surfaces are with second spring, 14 backs and insert in the 3rd iron block 7 center pits, one end of electronic dynamometer 4 is fixed on the end of guide cylinder 17 near fixed pulley 2, the other end of electronic dynamometer 4 connects wire rope 16, wire rope 16 passes guide cylinder 17 endoporus successively, first iron block 5, first slide cartridge 11, second iron block 6, behind the center pit of second slide cartridge 13 and the 3rd iron block 7, around control fixed pulley 1, pass in the aluminium alloy track 15 again and walk around fixed pulley 2, be buckled at last on the guide cylinder 17.

Described first iron block 5 and second iron block, 6 head and the tail are at a distance of 80-100cm, and second iron block 6 and the 3rd iron block 7 head and the tail are at a distance of 50-70cm.

With the utility model device according to the described installation of summary of the invention, shake handwheel 3 counterclockwise at a slow speed, make first iron block 5 at a slow speed to front slide, electronic dynamometer 4 readings continue to increase, when first iron block, 5 centers reach top, the first high strong magnet, 8 centers, electronic dynamometer 4 readings reach maximum value for the first time, continue to promote first iron block 5, electronic dynamometer 4 readings reduce, when first iron block 5 breaks away from the first high strong magnet, 8 zones of influence, electronic dynamometer 4 readings reach stable minimum value, and this moment, first iron block 5 reached the remaining stage; Continue to shake counterclockwise handwheel 3, when first iron block 5 when first spring 12 on second iron block 6 contacts, second iron block 6 is subjected to thrust that first iron block 5 transmits and slippage forward, electronic dynamometer 4 readings continue to increase, when second iron block, 6 centers reach top, the second high strong magnet, 9 centers, electronic dynamometer 4 readings reach maximum value again, continue to shake handwheel 3 and reach stable smaller value again until electronic dynamometer 4 readings, and this moment second, iron block 6 arrived the remaining stage; Continue to shake handwheel 3, second iron block 6 contacts with second spring 14 on the 3rd iron block 7, the 3rd iron block 7 is subjected to thrust that second iron block 6 transmits and slippage forward, electronic dynamometer 4 readings continue to increase, when the 3rd iron block 7 centers reach top, the 3rd high strong magnet 10 centers, electronic dynamometer 4 readings reach maximum value for the last time, electronic dynamometer 4 reading continuous decrease are until reaching last little value subsequently, this moment, the 3rd iron block 7 also reached the remaining stage, final three unit have all reached the remaining stage, whole destruction has taken place in the soil body, whole process simulation the progressive cumulative damage process from the local failure to integral body, destroyed of soil body unit.In this process, read the reading in the electronic dynamometer continuously, can obtain the relation of thrust and shear displacemant, as shown in Figure 4.Shake handwheel 3 repositions clockwise, can test easily next time.

Above-mentioned embodiment is used for the utility model of explaining; rather than the utility model limited; in the protection domain of spirit of the present utility model and claim, any modification and change to the utility model is made all fall into protection domain of the present utility model.

Claims

1. the analog demenstration instrument of a progressive cumulative damage, it is characterized in that: comprise control fixed pulley (1), fixed pulley (2), electronic dynamometer (4), three iron blocks (5,6,7), three high strong magnets (8,9,10), two slide cartridges (11,13), two springs (12,14), aluminium alloy track (15), wire rope (16) and guide cylinder (17); Control fixed pulley (1) and fixed pulley (2) are installed respectively at the two ends of aluminium alloy track (15), aluminium alloy track (15) between control fixed pulley (1) and fixed pulley (2) is installed first iron block (5), second iron block (6) and the 3rd iron block (7), the orienting lug and aluminium alloy track (15) formation that are arranged on three iron block lower ends are slidingly matched, from first iron block (5) of fixed pulley (2) towards control fixed pulley (1) direction, the front end of second iron block (6) and the 3rd iron block (7) is installed the first high strong magnet (8) respectively successively, the second high strong magnet (9) and the 3rd high strong magnet (10), three high strong magnets all are arranged on below the aluminium alloy track (15), first iron block (5), the center of second iron block (6) and the 3rd iron block (7) has the center pit of perforation, first iron block (5) is towards the end welding guide cylinder (17) of fixed pulley (2), guide cylinder (17) is provided with electronic dynamometer (4) in the hole, the two ends of second iron block (6) are welded first slide cartridge (11) and second slide cartridge (13) respectively, first slide cartridge (11) external cylindrical surface is with first spring (12) back and inserts in first iron block (5) center pit, second slide cartridge (13) external cylindrical surface is with second spring (14) back and inserts in the 3rd iron block (7) center pit, one end of electronic dynamometer (4) is fixed on the end of guide cylinder (17) near fixed pulley (2), the other end of electronic dynamometer (4) connects wire rope (16), wire rope (16) passes guide cylinder (17) endoporus successively, first iron block (5), first slide cartridge (11), second iron block (6), behind the center pit of second slide cartridge (13) and the 3rd iron block (7), around control fixed pulley (1), pass in the aluminium alloy track (15) again and walk around fixed pulley (2), be buckled at last on the guide cylinder (17).

2. the analog demenstration instrument of a kind of progressive cumulative damage according to claim 1 is characterized in that: described first iron block (5) and second iron block (6) head and the tail are at a distance of 80-100cm, and second iron block (6) and the 3rd iron block (7) head and the tail are at a distance of 50-70cm.