CN105445093A - Gradienter for split-Hopkinson-pressure-bar splitting test piece - Google Patents
Gradienter for split-Hopkinson-pressure-bar splitting test piece Download PDFInfo
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- CN105445093A CN105445093A CN201510969764.6A CN201510969764A CN105445093A CN 105445093 A CN105445093 A CN 105445093A CN 201510969764 A CN201510969764 A CN 201510969764A CN 105445093 A CN105445093 A CN 105445093A
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- protective cover
- bar
- thread
- bearing
- hopkinson pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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Abstract
A disclosed gradienter for split-Hopkinson-pressure-bar splitting test piece mainly comprises a protective shield, a support, a half-thread bushing, a balancing tray and a fixed bar. The protective shield is formed by a protective-shield rear cover, a protective-shield front cover and two side baffle plates, and the center part of each side baffle plate is provided with a circular hole for passing of a split Hopkinson pressure bar; and the upper surface of the support is an oblique surface, the fixed bar is fixedly disposed on the upper surface, the upper part of the fixed bar is connected with the balancing tray through the half-thread bushing, the height of the balancing tray is adjusted by rotating the half-thread bushing, and the upper surface of the balancing tray is provided with scale. During experiment, the test piece is put at a corresponding scale, and by adjusting the vertical-direction height and the horizontal-direction scale, the fact is guaranteed that the diameter direction of a middle cross section along the height direction of the test piece is collinear with axes of an incidence bar and a transmission bar in the split Hopkinson pressure bar, and thus the precision of the splitting test is improved.
Description
Technical field
The invention belongs to mechanical testing equipment field, be specifically related to a kind of Hopkinson pressure bar diametral compression test test specimen leveling instrument.
Background technology
In recent years, the dynamic characteristics research of rock type materials is a large focus.Under dynamic loading, the dynamic tension mechanical characteristic of this kind of material is identical with pressurized, but dynamically tension experiment is very high to the requirement of equipment, success ratio is very low, test relative to uniaxial compression, achievement is less, and at present, comparatively widely used is adopt split hopkinson press bar device to carry out Brazilian disc spilt test.During test, test specimen is radially clipped between incident bar and transmission bar, test specimen play knick point in the central spot of test specimen, and radially loading direction is expanded to both sides, until surface of test piece, therefore, in device test specimen and pull bar connected mode to the operation tested and Influence on test result very large, especially the hard brittle material such as rock, concrete, pottery, the stress in test specimen concentrates the inefficacy that test specimen can be caused too early.The reason causing stress in test specimen to be concentrated is the axis Disalignment of whole system, therefore need in process of the test to guarantee test specimen along section diametric(al) in the middle of in short transverse and incident bar and transmission bar axis on the same line, when carrying out dynamic splitting test, many employings ocular estimate is to realize this purpose at present, and this has impact to the precision of test.Therefore, needing to develop one can Anping diametral compression test test specimen, and equipment simple to operate, improves the precision of diametral compression test.
Summary of the invention
For ensure test specimen in current Hopkinson pressure bar dynamic splitting test along section diametric(al) in the middle of in short transverse and incident bar and transmission bar axis on the same line, improve the precision of diametral compression test, the invention provides a kind of Hopkinson pressure bar diametral compression test test specimen leveling instrument.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of Hopkinson pressure bar diametral compression test test specimen leveling instrument, comprises protective cover, bearing (3), half-thread cover (5), Anping pallet (6), fixed bar (7);
Described bearing (3) upper surface is dip plane, has groove at the middle part of upper surface and protective cover protecgulum (2) contact position, the darkest in the middle of groove, shoals gradually to both sides; Fixed bar (7) is fixed with at the middle part of bearing (3) upper surface, fixed bar (7) from lower to upper cross-sectional sizes is different, lower section is large, cross section, top is little, two different cross sections are intersegmental without transition, external thread is provided with in the bottom of the small bore section of fixed bar (7), small bore section is connected with half-thread cover (5) by screw thread, half-thread cover (5) is cylindric, internal thread process is done in its underpart, is connected by screw thread with small bore is intersegmental; The internal diameter of half-thread cover (5) is equal with the maximum outside diameter of small bore section, the equal diameters of the heavy in section section of external diameter and fixed bar (7); Anping pallet (6) is inserted with in the top cylinder of half-thread cover (5); Protective cover bonnet (1) and two side shields of bearing (3) upper surface and protective cover weld, bottom is for falling " recessed " shape, be provided with screw falling the two sides of " recessed " shape, pass through gib screw (4) between the crossbeam (11) of bearing (3) and Hopkinson pressure bar system and be connected;
The bottom of described Anping pallet (6) is right cylinder, is provided with scale on cylindrical top, and cylindrical bottom is inserted in half-thread cover (5); The top of Anping pallet (6) is rectangular structure, its upper surface is parallel with the beam surface upper of Hopkinson pressure bar system, axis along Hopkinson pressure bar (12) is long limit, radial direction along Hopkinson pressure bar (12) is minor face, is provided with scale in the center of Anping pallet (6) upper surface along long side direction to symmetria bilateralis;
Described protective cover comprises protective cover bonnet (1), protective cover protecgulum (2) and two side shields, wherein, the part that protective cover bonnet (1) is cylindrical shell, protective cover protecgulum (2) is made up of curvature portion and planar section, be arc transition between the two, wherein curvature portion and protective cover bonnet (1) part that is same cylindrical shell, planar section is rectangle, the curvature portion of protective cover protecgulum (2) is connected by hinge (8) with protective cover bonnet (1), two side shields, protective cover bonnet (1), protective cover protecgulum (2), bearing (3) upper surface forms a closed space jointly, circular port is had at the middle part of two side shields, weld together with protective cover bonnet (1) on the upside of two side shields, downside and bearing (3) upper surface weld together,
Under the planar section of described protective cover protecgulum (2), middle side part is provided with bayonet lock (9), and one end of bayonet lock (9) is hinged on the downside of protective cover protecgulum (2), and the other end can rotate around stationary shaft; Immediately below bayonet lock (9), bearing (3) upper surface has a groove, groove is located the darkest immediately below bayonet lock (9), shoal gradually to both sides, the distance from bayonet lock (9) hinged end to bottom portion of groove each point equals brachium when bayonet lock (9) rotates.
Beneficial effect of the present invention is:
(1) a kind of Hopkinson pressure bar diametral compression test test specimen leveling instrument provided by the invention, by horizontal centring adjustment and vertical centering adjustment ensure test specimen along section diametric(al) in the middle of in short transverse and the incident bar in Hopkinson pressure bar and transmission bar axis on the same line, and then the precision of raising diametral compression test;
(2) the present invention is simple to operate, is easy to adjustment, is applicable to the diametral compression test of different size test specimen;
(3) the present invention is with protective cover, can collect the broken test block after test, upper surface of support is made dip plane and is conducive to broken test block and is slipped to protective cover protecgulum place, is convenient to cleaning, can prevent from broken test block from splashing to hurt sb.'s feelings simultaneously, thus the safety of warranty test operating personnel;
(4) bearing in the present invention is inverted concave, can move freely on Hopkinson pressure bar crossbeam, after moving to desired location, is fixed on Hopkinson pressure bar crossbeam by gib screw.
Accompanying drawing explanation
Fig. 1 is elevation drawing of the present invention;
Fig. 2 is fixed bar of the present invention, connection diagram between half-thread cover and Anping pallet;
Fig. 3 is Anping of the present invention pallet schematic diagram;
Fig. 4 is protective cover protecgulum schematic diagram of the present invention;
Fig. 5 is connection diagram between the present invention and Hopkinson crossbeam;
Fig. 6 is connection diagram between the present invention and Hopkinson pressure bar.
Number in the figure illustrates: 1-protective cover bonnet, 2-protective cover protecgulum, 3-bearing, 4-gib screw, 5-half-thread cover, 6-Anping pallet, 7-fixed bar, 8-hinge, 9-bayonet lock, 10-test specimen, the crossbeam of 11-Hopkinson pressure bar system, 12-Hopkinson pressure bar, 13-Hopkinson pressure bar diametral compression test test specimen leveling instrument.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail:
A kind of Hopkinson pressure bar diametral compression test test specimen leveling instrument, comprises protective cover, bearing (3), half-thread cover (5), Anping pallet (6), fixed bar (7);
Described bearing (3) upper surface is dip plane, has groove at the middle part of upper surface and protective cover protecgulum (2) contact position, the darkest in the middle of groove, shoals gradually to both sides; Fixed bar (7) is fixed with at the middle part of bearing (3) upper surface, fixed bar (7) from lower to upper cross-sectional sizes is different, lower section is large, cross section, top is little, two different cross sections are intersegmental without transition, external thread is provided with in the bottom of the small bore section of fixed bar (7), small bore section is connected with half-thread cover (5) by screw thread, half-thread cover (5) is cylindric, internal thread process is done in its underpart, is connected by screw thread with small bore is intersegmental; The internal diameter of half-thread cover (5) is equal with the maximum outside diameter of small bore section, the equal diameters of the heavy in section section of external diameter and fixed bar (7); Anping pallet (6) is inserted with in the top cylinder of half-thread cover (5); Protective cover bonnet (1) and two side shields of bearing (3) upper surface and protective cover weld, bottom is for falling " recessed " shape, be provided with screw falling the two sides of " recessed " shape, pass through gib screw (4) between the crossbeam (11) of bearing (3) and Hopkinson pressure bar system and be connected;
The bottom of described Anping pallet (6) is right cylinder, is provided with scale on cylindrical top, and cylindrical bottom is inserted in half-thread cover (5); The top of Anping pallet (6) is rectangular structure, its upper surface is parallel with the beam surface upper of Hopkinson pressure bar system, axis along Hopkinson pressure bar (12) is long limit, radial direction along Hopkinson pressure bar (12) is minor face, is provided with scale in the center of Anping pallet (6) upper surface along long side direction to symmetria bilateralis;
Described protective cover comprises protective cover bonnet (1), protective cover protecgulum (2) and two side shields, wherein, the part that protective cover bonnet (1) is cylindrical shell, protective cover protecgulum (2) is made up of curvature portion and planar section, be arc transition between the two, wherein curvature portion and protective cover bonnet (1) part that is same cylindrical shell, planar section is rectangle, the curvature portion of protective cover protecgulum (2) is connected by hinge (8) with protective cover bonnet (1), two side shields, protective cover bonnet (1), protective cover protecgulum (2), bearing (3) upper surface forms a closed space jointly, circular port is had at the middle part of two side shields, weld together with protective cover bonnet (1) on the upside of two side shields, downside and bearing (3) upper surface weld together,
Under the planar section of described protective cover protecgulum (2), middle side part is provided with bayonet lock (9), and one end of bayonet lock (9) is hinged on the downside of protective cover protecgulum (2), and the other end can rotate around stationary shaft; Immediately below bayonet lock (9), bearing (3) upper surface has a groove, groove is located the darkest immediately below bayonet lock (9), shoal gradually to both sides, the distance from bayonet lock (9) hinged end to bottom portion of groove each point equals brachium when bayonet lock (9) rotates.
As shown in Figure 1, the present invention is by protective cover, and bearing (3) and Anping pallet (6) form, and wherein protective cover is made up of protective cover bonnet (1), protective cover protecgulum (2) and two side shields; Bearing (3) is by " recessed " shape base and fixed bar (7) form, fixed bar (7) top is Anping pallet (6), connected by half-thread cover (5) between the two, whole Hopkinson pressure bar diametral compression test test specimen leveling instrument can be fixed on the crossbeam (11) of Hopkinson pressure bar system by the gib screw (4) fallen on " recessed " shape base.
The mode that Anping pallet (6) realizes its Anping function is: be provided with scale on the top of Anping pallet (6) lower cylinder, this scale value specifically refers to the half of general Hopkinson pressure bar diametral compression test height of specimen value, test specimen is adjusted in the height direction with this, make the horizontal axis cross section of the incident bar in test specimen midsection and Hopkinson pressure bar and transmission coplanar, scale is provided with along long side direction to symmetria bilateralis in the center of Anping pallet (6) upper surface, this scale value specifically refers to the diameter of general Hopkinson pressure bar diametral compression test test specimen, test specimen is adjusted in the horizontal direction with this, make the axis of incident bar in test specimen midsection place's diametric(al) and Hopkinson pressure bar and transmission bar on the same line.
By reference to the accompanying drawings, by specific embodiment, the present invention will be described:
When using the present invention to carry out diametral compression test, first, the present invention is erected on Hopkinson pressure bar system crossbeam, as shown in Figure 1:
1. rotate bayonet lock (9), make itself and bearing (3) upper surface contactless;
2. protective cover protecgulum (2) is slowly raised up to vertical position;
3. Anping: test specimen is placed on Anping pallet (6), the round section of test specimen contacts with Anping pallet (6) upper surface, according to the height of test specimen, by rotating half-thread cover (5), in the vertical direction adjusts Anping pallet (6), ensure that the horizontal axis cross section of incident bar in test specimen midsection and Hopkinson pressure bar and transmission is coplanar with this, then according to the scale on test specimen diameter and Anping pallet (6) upper surface, test specimen is placed on the corresponding graduation position of Anping pallet (6), the axis of incident bar in test specimen midsection place's diametric(al) and Hopkinson pressure bar and transmission bar is ensured on the same line with this,
4. the incident bar in adjustment Hopkinson pressure bar, to appropriate location, pulls the present invention, is not in contact with it is advisable with the close incident bar of test specimen (10);
5. pull the transmission bar in Hopkinson pressure bar, make close contact between incident bar, test specimen (10), transmission bar by adjustment transmission bar;
6. slowly put down protective cover protecgulum (2), rotate bayonet lock (9), in the groove that its free end is entered in bearing (3) upper surface;
7. by gib screw (4), the present invention is fixed on Hopkinson pressure bar system crossbeam, as shown in Figure 6.
Above-described embodiment is only better embodiment of the present invention; specifically understand technical conceive of the present invention and essential implementation by reference to the accompanying drawings; not protection scope of the present invention is limited; change, the modification done under all Spirit Essences according to technical solution of the present invention and principle, substitute, combination, to simplify; all should be the substitute mode of equivalence, all should be encompassed within protection scope of the present invention.
Claims (4)
1. a Hopkinson pressure bar diametral compression test test specimen leveling instrument, comprise protective cover, bearing (3), half-thread cover (5), Anping pallet (6), fixed bar (7), it is characterized in that: described bearing (3) upper surface is dip plane, groove is had at the middle part of upper surface and protective cover protecgulum (2) contact position, the darkest in the middle of groove, shoal gradually to both sides; Fixed bar (7) is fixed with at the middle part of bearing (3) upper surface, fixed bar (7) from lower to upper cross-sectional sizes is different, lower section is large, cross section, top is little, two different cross sections are intersegmental without transition, external thread is provided with in the bottom of the small bore section of fixed bar (7), small bore section is connected with half-thread cover (5) by screw thread, half-thread cover (5) is cylindric, internal thread process is done in its underpart, is connected by screw thread with small bore is intersegmental; The internal diameter of half-thread cover (5) is equal with the maximum outside diameter of small bore section, the equal diameters of the heavy in section section of external diameter and fixed bar (7); Anping pallet (6) is inserted with in the top cylinder of half-thread cover (5); Protective cover bonnet (1) and two side shields of bearing (3) upper surface and protective cover weld, bottom is for falling " recessed " shape, be provided with screw falling the two sides of " recessed " shape, pass through gib screw (4) between the crossbeam (11) of bearing (3) and Hopkinson pressure bar system and be connected.
2. a kind of Hopkinson pressure bar diametral compression test test specimen leveling instrument according to claim 1, it is characterized in that: the bottom of described Anping pallet (6) is right cylinder, be provided with scale on cylindrical top, cylindrical bottom is inserted in half-thread cover (5); The top of Anping pallet (6) is rectangular structure, its upper surface is parallel with the beam surface upper of Hopkinson pressure bar system, axis along Hopkinson pressure bar (12) is long limit, radial direction along Hopkinson pressure bar (12) is minor face, is provided with scale in the center of Anping pallet (6) upper surface along long side direction to symmetria bilateralis.
3. a kind of Hopkinson pressure bar diametral compression test test specimen leveling instrument according to claim 1, it is characterized in that: described protective cover comprises protective cover bonnet (1), protective cover protecgulum (2) and two side shields, wherein, the part that protective cover bonnet (1) is cylindrical shell, protective cover protecgulum (2) is made up of curvature portion and planar section, be arc transition between the two, wherein curvature portion and protective cover bonnet (1) part that is same cylindrical shell, planar section is rectangle, the curvature portion of protective cover protecgulum (2) is connected by hinge (8) with protective cover bonnet (1), two side shields, protective cover bonnet (1), protective cover protecgulum (2), bearing (3) upper surface forms a closed space jointly, circular port is had at the middle part of two side shields, weld together with protective cover bonnet (1) on the upside of two side shields, downside and bearing (3) upper surface weld together.
4. a kind of Hopkinson pressure bar test fragment according to claim 3 is collected and protective device, it is characterized in that: under the planar section of described protective cover protecgulum (2), middle side part is provided with bayonet lock (9), one end of bayonet lock (9) is hinged on the downside of protective cover protecgulum (2), and the other end can rotate around stationary shaft; Immediately below bayonet lock (9), bearing (3) upper surface has a groove, groove is located the darkest immediately below bayonet lock (9), shoal gradually to both sides, the distance from bayonet lock (9) hinged end to bottom portion of groove each point equals brachium when bayonet lock (9) rotates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510969764.6A CN105445093B (en) | 2015-12-17 | 2015-12-17 | A kind of Hopkinson pressure bar diametral compression test test specimen leveling instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510969764.6A CN105445093B (en) | 2015-12-17 | 2015-12-17 | A kind of Hopkinson pressure bar diametral compression test test specimen leveling instrument |
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| CN105445093A true CN105445093A (en) | 2016-03-30 |
| CN105445093B CN105445093B (en) | 2017-11-07 |
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| CN201510969764.6A Expired - Fee Related CN105445093B (en) | 2015-12-17 | 2015-12-17 | A kind of Hopkinson pressure bar diametral compression test test specimen leveling instrument |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106198190A (en) * | 2016-07-06 | 2016-12-07 | 合肥工业大学 | A kind of Hopkinson pressure bar experiment sample collection device |
| CN106644691A (en) * | 2016-12-09 | 2017-05-10 | 安徽省建筑工程质量监督检测站 | Support leveling device for testing of splitting tensile strength and clamp thereof |
| CN108267361A (en) * | 2018-01-25 | 2018-07-10 | 无锡职业技术学院 | A kind of clamshell Hopkinson pressure bar test specimen collection device |
| CN108760465A (en) * | 2018-04-18 | 2018-11-06 | 河海大学 | The test specimen leveling instrument of hopkinson test |
| CN109708956A (en) * | 2019-01-17 | 2019-05-03 | 浙江大学 | A kind of positioning device for dynamic splitting test |
| CN109708955A (en) * | 2019-01-17 | 2019-05-03 | 浙江大学 | A kind of positioning device for Hopkinson pressure bar |
| CN112665995A (en) * | 2020-12-17 | 2021-04-16 | 武汉理工大学 | Parallel Hopkinson bar simulation instant unloading test device and method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106198190A (en) * | 2016-07-06 | 2016-12-07 | 合肥工业大学 | A kind of Hopkinson pressure bar experiment sample collection device |
| CN106644691A (en) * | 2016-12-09 | 2017-05-10 | 安徽省建筑工程质量监督检测站 | Support leveling device for testing of splitting tensile strength and clamp thereof |
| CN108267361A (en) * | 2018-01-25 | 2018-07-10 | 无锡职业技术学院 | A kind of clamshell Hopkinson pressure bar test specimen collection device |
| CN108760465A (en) * | 2018-04-18 | 2018-11-06 | 河海大学 | The test specimen leveling instrument of hopkinson test |
| CN109708956A (en) * | 2019-01-17 | 2019-05-03 | 浙江大学 | A kind of positioning device for dynamic splitting test |
| CN109708955A (en) * | 2019-01-17 | 2019-05-03 | 浙江大学 | A kind of positioning device for Hopkinson pressure bar |
| CN112665995A (en) * | 2020-12-17 | 2021-04-16 | 武汉理工大学 | Parallel Hopkinson bar simulation instant unloading test device and method |
| CN112665995B (en) * | 2020-12-17 | 2024-03-22 | 武汉理工大学 | Parallel-arranged Hopkinson bar simulation instant unloading test device and method |
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|---|---|
| CN105445093B (en) | 2017-11-07 |
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