CN105716957A - Universal type true-triaxial static load pre-loading system for split Hopkinson pressure bar - Google Patents
Universal type true-triaxial static load pre-loading system for split Hopkinson pressure bar Download PDFInfo
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- CN105716957A CN105716957A CN201610202354.3A CN201610202354A CN105716957A CN 105716957 A CN105716957 A CN 105716957A CN 201610202354 A CN201610202354 A CN 201610202354A CN 105716957 A CN105716957 A CN 105716957A
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- 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
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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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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Abstract
The invention provides a universal type true-triaxial static load pre-loading system for a split Hopkinson pressure bar. A main counter-force steel frame is a carrier of axial pre-loading systems and radial pre-loading systems and is mounted on brackets of a guide rail system. The two axial pre-loading systems are located at two ends of the main counter-force steel frame and mounted on axial counter-force frames of the main counter-force steel frame. The four radial pre-loading systems are mounted in middles of assembly cross beams of the main counter-force steel frame in the length direction; center lines of radial oil cylinders of the radial pre-loading system are perpendicular to the center line of a radial pre-loading bar of the axial pre-loading system. The universal type true-triaxial static load pre-loading system in variable sizes is suitable for large-diameter split Hopkinson pressure bars, triaxial static loads can be independently and controllably applied to a rock sample, and the system has the characteristics of high universality and good economical performance and is simple in structure, convenient to mount and operate and high in automation degree.
Description
Technical field
The present invention relates to material mechanical performance technical field of measurement and test, specifically a kind of universal pre-adding system of true triaxial static load suitable in split hopkinson press bar.
Background technology
When underground engineering rock mass is in three-dimensional unequal stress, and destroyed by the impact dynamic load effects such as earthquake shock, Excavation blasting even weapon strike more, the crash characteristics under rock material true triaxial stress condition is carried out research there is necessity.
At present, true triaxial test machine is difficult to middle high strain-rate impact load and applies, and split hopkinson press bar (SHPB) device is as research strain rate section 101-103s-1The classical trials system of rock fragile materials dynamic property is widely used.Conventional SHPB device is mainly used in the test of material single shaft mechanical property.Existing confined pressure SHPB device is mainly through carrying out impact test after sample is applied confined pressure, existing normal triaxial sound combination test apparatus is mainly through carrying out axial impact test after sample is applied lateral confined pressure and axial static stress, and this both of which is difficult to the good simulation of the three-dimensional unequal stress condition to underground engineering rock.
At present, based on the existing application of Multi-axial Loading device that SHPB device improves, but due to the multiformity of SHPB plant bulk assembling etc., mostly being the upgrading that unit one belongs to carries out for its concrete model, the variable-sized pre-adding system of true triaxial static load with versatility not yet occurs.
Summary of the invention
For overcoming the deficiency of the good simulation of the three-dimensional unequal stress condition to underground engineering rock that is difficult to existed in prior art, the present invention proposes a kind of universal pre-adding system of true triaxial static load for split hopkinson press bar.
The present invention includes body counter-force steelframe, axial Preload system, radially Preload system and guide track system.Described main body counter-force steelframe is described axial Preload system and the carrier of radial direction Preload system.This main body counter-force steelframe is arranged on the bracket of guide track system.Described axial Preload system has two sets, lays respectively at the two ends of described main body counter-force steelframe, and is arranged on the axial reaction frame of this main body counter-force steelframe.Described radial direction Preload system has four sets, is installed in the medium position of the assembling crossbeam length direction of described main body counter-force steelframe；The centrage of the central axis of the radial direction jack cylinder in described each radial direction Preload system axial prestrain bar in described axial Preload system.
Described guide track system includes two brackets, moves radially guide rail for a pair, four two-way rollers and move axially guide rail a pair.Four wherein said two-way rollers be divided into two groups be placed in described in move radially on guide rail.The pair of guide rail that moves axially is separately mounted on two groups of two-way rollers.The two ends of two brackets are separately mounted to one and move axially on guide rail.Described move radially guide rail and be mutually perpendicular to moving axially guide rail.Described move axially the guide rail parallel axial prestrain bar in axial Preload system.
Described two-way roller is for overall by affixed for the turning rolls surface of two roller set, makes the roller in two roller set lay respectively at the upper and lower surface of this two-way roller.Described turning rolls is groove-like, has two pair roller mounting grooves on the wallboard of each turning rolls respectively.The axis of the roller of the described upper surface being positioned at this two-way roller is mutually perpendicular to the axis of the roller of the lower surface being positioned at this two-way roller.Having mounting platform respectively at the top of said two bracket, this mounting platform is connected by bolt with the radial bearing reaction frame in described main body counter-force steelframe.
Described main body counter-force steelframe includes two axial reaction frames, two radial bearing reaction framves, two axial oil cylinder fixed cover cylinders, four fixing sleeves of radial oil cylinders and four assembling crossbeams and T shaped connecting piece and I shape connector.Wherein, four middle parts assembling crossbeams and two ends are separately fixed on the end face of each T shaped connecting piece and I shape connector；Described each T shaped connecting piece is distributed on the circumference of each radial bearing reaction frame；Described each I shape connector is distributed on the circumference of each axial reaction frame.Said two axial oil cylinder fixed cover cylinder lays respectively at the two ends of described main body counter-force steelframe, and is fixed on each axial reaction frame by fixing plate.The fixing sleeve of described four radial oil cylinders is respectively through on the center being bolted to each assembling crossbeam length direction.
Described axial Preload system includes axial jack, axial prestrain bar, drawing head and axial locating ring.Described axial jack includes axial jack cylinder, hollow piston, unloading fuel tap, loads fuel tap and air valve.Described axial jack cylinder contains front grease chamber and rear grease chamber, and described front grease chamber communicates with loading fuel tap, and described rear grease chamber communicates with unloading fuel tap；Described front grease chamber and rear grease chamber are separately installed with air valve.The inner surface of the circumferential surface of the piston head of described hollow piston and axial jack cylinder is joined sealing and is closed.
The hollow stem at described hollow piston two ends stretches out from the tapping at axial jack cylinder two ends respectively.Described axial prestrain bar loads in described hollow piston, and this one end stating axial prestrain bar passes from the end cap central of the drawing head being sleeved on described hollow piston.
Described round rod segment has the pressure-bearing shaft shoulder, after one end of described axial prestrain bar penetrates endoporus and the axial locating ring of round outside but spuare inside ring-type of described hollow piston successively, one end face of this pressure-bearing shaft shoulder and this hollow piston one end end face offset, and drawing head is sleeved on this axial prestrain bar, the inner face of drawing head and another end face of the pressure-bearing shaft shoulder is made to offset, thus realizing the axial location to described axial prestrain bar；Threaded between described drawing head and hollow piston.Described axial prestrain bar square bar section is crossed through the square opening of axial locating ring and is positioned.
The shaft of described axial prestrain bar is divided into round rod segment, circle-side's variable cross-section section and square bar section.Round rod segment therein contacts with the waveguide rod of SHPB device, for transmitting the dynamic load of SHPB device；Described circle-side's variable cross-section section is the changeover portion that the shaft of this axial prestrain bar is gradually varied to square section by circular section；Described square bar section and sample contacts, and this sample is pressed.
Described axial locating ring is round outside but spuare inside circulus, and square opening size and axial prestrain bar square bar section sectional dimension match and pass for axial prestrain bar square bar section and position.Described drawing head is tube-in-tube structure, and one end bore size and axial prestrain bar round rod segment sectional dimension match for its traverse, and the other end is threadeded with described hollow piston.
Described radial direction Preload system includes four radially jack and loading heads.Described radial direction jack includes radially jack cylinder, piston, sealing ring, unloading fuel tap, loading fuel tap and air valve.
Described radial direction jack cylinder comprises front grease chamber and rear grease chamber, and wherein said front grease chamber communicates with loading fuel tap, and rear grease chamber communicates with unloading fuel tap；Described front grease chamber and rear grease chamber all there is air valve.
Described jack cylinder is respectively charged in the fixing sleeve of radial oil cylinders.The fixing sleeve of described each radial oil cylinders is fixed on the surface of assembling crossbeam length direction medium position.The piston head of described each piston is respectively charged in the inner chamber of radially jack cylinder, and is sealed by sealing ring；The piston rod of described piston is placed through the hole, location on assembling crossbeam, and makes matched in clearance therebetween.
The termination of described piston rod is convex hemispherical；One end of described loading head is the multi-directional ball dish being made up of magnetic material, in recessed hemispherical, be fitted together to described tailpiece of the piston rod magnetic and contact；The other end of described loading head and sample contacts, face size matches with the specimen size contacted.
The present invention is a kind of suitable in major diameter split hopkinson press bar (SHPB) device, the variable-sized pre-adding system of true triaxial static load being capable of the rock sample individually controllable applying of three-dimensional static load.The present invention coordinates with SHPB device, it is possible to realize rock fragile materials true triaxial coupled static-dynamic loadingi.
For achieving the above object, the main body counter-force steelframe of the present invention is arranged on the bracket of guide track system.Two overlap axial Preload system lays respectively at the two ends of described main body counter-force steelframe, and is arranged on the axial reaction frame of this main body counter-force steelframe.Four sets radially Preload system is installed in the medium position of the assembling crossbeam length direction of described main body counter-force steelframe；The centrage of the central axis of the radial direction jack cylinder in each radially Preload system axial prestrain bar in described axial Preload system.
Guide track system in the present invention is for meeting axial displacement when sample is exerted a force by true triaxial static load pre-adding system, and the radial translation realizing this pre-adding system of true triaxial static load resets.Having mounting platform respectively at the top of two brackets 12 of described guide track system, this mounting platform is connected by bolt with the radial bearing reaction frame 5 in described main body counter-force steelframe.
Described main body counter-force steelframe primarily serves the purpose of fixing Preload system, it is provided that reaction of bearing, has " self-balancing " feature.
Described main body counter-force steelframe side elevation is " ¤ " shape, and middle part and the two ends of four assembling crossbeams therein are separately fixed on the end face of each T shaped connecting piece and I shape connector；Described each T shaped connecting piece is distributed on the circumference of each radial bearing reaction frame；Described each I shape connector is distributed on the circumference of each axial reaction frame.Two axial oil cylinder fixed cover cylinders lay respectively at the two ends of described main body counter-force steelframe, and are fixed on each axial reaction frame by fixing plate.Four fixing sleeves of radial oil cylinders are respectively through on the center being bolted to each assembling crossbeam length direction.Counter-force steelframe of the present invention all adopts hollow section or shaped steel with ribbing to be formed by connecting, and reduces overall weight under the premise ensureing integral rigidity, and method of attachment mainly welding and bolt connect, and bolt used is high-strength vibrationproof bolt.
Loading head in axial prestrain bar in axial Preload system in the present invention and radially Preload system can transform size, to mate the SHPB device and specimen size being suitable for, described technical scheme has versatility.The round rod segment diameter of section of described axial prestrain club body and the SHPB device waveguide rod equal diameters being suitable for, and square bar section sectional dimension is mated with specimen size, round rod segment cross section and square bar section cross section all adopt the long-pending design of uiform section, are beneficial to the propagation of impulse wave；The diameter of piston rod of multi-directional ball dish one end sectional dimension of described loading head and radially Preload system matches, and other end sectional dimension matches with the specimen size contacted.
The present invention and the SHPB device that is suitable for the use of, after placing sample, adjust the initial position of each axial prestrain bar of centering and loading head, according to default load path, control described axial Preload system to the dead load that radially Preload system applies to corresponding static load grade, omnidistance collection pre-add static load process load-displacement information；Adjusting SHPB device input lever and take-off lever position, so as to fit tightly with the end face of described axial prestrain bar, conventionally SHPB device experiment code applies impact load and gathers stress wave information.Complete the true triaxial coupled static-dynamic loadingi process of sample.
Compared with prior art, the present invention obtains and provides the benefit that:
The present invention and SHPB device with the use of, it is possible to solve rock fragile materials true triaxial static load and impact load combination loading problem, it is achieved to the research of rock fragile materials impact dynamic under three-dimensional unequal stress in laboratory；It is used alone the present invention and can realize the true triaxial static compression test of rock fragile materials.Complete function.
The present invention is applicable to existing most large diameter SHPB, and the SHPB waveguide rod diameter range being suitable for is: 50mm～110mm.Ranging for of experimental sample size: length and width 40mm～100mm, high 20mm～300mm.There is the feature of highly versatile and good economy performance.
The present invention independently can control by default load path, solves the true triaxial static state of rock fragile materials under complicated stress environment and condition of high ground stress, dynamic and coupled static-dynamic loadingi problem.Device integral rigidity is high, certainty of measurement is high, and data acquisition is automatically finished, and can obtain overall process stress strain curve.
Present configuration is succinct, it is easy to operate to install, and automaticity is high.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the top view of Fig. 1；
Fig. 3 is the side view of Fig. 1；
Fig. 4 is A-A view in Fig. 2；
Fig. 5 is B-B view in Fig. 2；
Fig. 6 is C-C view in Fig. 3；
Fig. 7 is the assembling schematic diagram of the axial Preload system of the present invention and radially Preload system；
Fig. 8 is the three dimensional sectional view of axial Preload system；
Fig. 9 is the structural representation of radial bearing reaction frame；
Figure 10 is the structural representation of guide track system；
Figure 11 is the structural representation of two-way roller.In figure:
1. assembling crossbeam；2. the fixing sleeve of radial oil cylinders；3. radial direction jack cylinder；4.T shaped connecting piece；5. radial bearing reaction frame；6. axial oil cylinder fixed cover cylinder；7. I shape connector；8. ring-type fixing plate；9. axial prestrain bar；10. drawing head；11. axially reaction frame；12. bracket；13. move radially guide rail；14. two-way roller；15. move axially guide rail；16. axially jack cylinder；17. fixing plate；18. hollow piston；19. loading head；20. piston；21. sample；22. axially locating ring；23. bolt；24. hole, location；25. radial oil cylinders fixed cover tube end plate；26. the pressure-bearing shaft shoulder；27. loading fuel tap；28. front grease chamber；29. sealing ring；30. rear grease chamber；31. unloading fuel tap；32. air valve.
Detailed description of the invention
The present embodiment is a kind of universal pre-adding system of true triaxial static load suitable in split hopkinson press bar, with SHPB device with the use of, it is possible to realize true triaxial coupled static-dynamic loadingi, be used alone be capable of true triaxial load.The waveguide rod diameter range of SHPB device is: 50mm～110mm.The size range of experimental sample 21 can be: length and width 40mm～100mm, high 20mm～300mm.The piston stroke of axial jack and radially jack is designed as 300mm, axial peak load grade is 3000KN, radially peak load grade is 1500KN, the true triaxial being realized three-dimensional unequal stress by SERVO CONTROL and displacement acquisition is loaded, and obtains the stress-strain diagram of sample 21 loading complete process.
The present embodiment includes main body counter-force steelframe, axial Preload system, radially Preload system and guide track system.
Described main body counter-force steelframe is described axial Preload system and the carrier of radial direction Preload system.This main body counter-force steelframe is arranged on the bracket 12 of guide track system.Described axial Preload system has two sets, lays respectively at the two ends of described main body counter-force steelframe, and is arranged on the axial reaction frame 11 of this main body counter-force steelframe.Described radial direction Preload system has four sets, is installed in the medium position of assembling crossbeam 1 length direction of described main body counter-force steelframe；The centrage of the central axis of the radial direction jack cylinder 3 in described each radial direction Preload system axial prestrain bar 9 in described axial Preload system.
Described guide track system is for meeting axial displacement when sample is exerted a force by true triaxial static load pre-adding system, and the radial translation realizing this pre-adding system of true triaxial static load resets.As shown in Figure 10, described guide track system includes two brackets 12, moves radially 13, four two-way rollers 14 of guide rail for a pair and move axially guide rail 15 for a pair.Four wherein said two-way rollers 14 be divided into two groups be placed in described in move radially on guide rail 13.The pair of guide rail 15 that moves axially is separately mounted on two groups of two-way rollers 14.The two ends of the bracket 12 of two triangular frame structure are separately mounted to one and move axially on guide rail.Described move radially guide rail and be mutually perpendicular to moving axially guide rail.Described move axially the guide rail parallel axial prestrain bar 9 in axial Preload system.
Described two-way roller 14 is by as a whole for the turning rolls surface soldered of two roller set, makes the roller in two roller set lay respectively at the upper and lower surface of this two-way roller.As shown in figure 11, described turning rolls is groove-like, has two pair roller mounting grooves on the wallboard of each turning rolls respectively.The axis of the roller of the described upper surface being positioned at this two-way roller is mutually perpendicular to the axis of the roller of the lower surface being positioned at this two-way roller.Having mounting platform respectively at the top of said two bracket 12, this mounting platform is connected by bolt with the radial bearing reaction frame 5 in described main body counter-force steelframe.
Described main body counter-force steelframe primarily serves the purpose of fixing Preload system, it is provided that reaction of bearing, has " self-balancing " feature.Described main body counter-force steelframe side elevation is " ¤ " shape, assembles crossbeams 1 and T shaped connecting piece 4 and I shape connector 7 including the fixing sleeve 2 of 11, two radial bearing reaction framves of two axial reaction frames, 6, four radial oil cylinders of 5, two axial oil cylinder fixed cover cylinders and four.Wherein, four middle parts assembling crossbeams 1 and two ends are separately fixed on the end face of each T shaped connecting piece 4 and I shape connector 7；Described each T shaped connecting piece 4 is distributed on the circumference of each radial bearing reaction frame 5；Described each I shape connector 7 is distributed on the circumference of each axial reaction frame 11.Said two axial oil cylinder fixed cover cylinder 6 lays respectively at the two ends of described main body counter-force steelframe, and is fixed on each axial reaction frame by fixing plate 17.The fixing sleeve 2 of described four radial oil cylinders is respectively through on the center being bolted to each assembling crossbeam 1 length direction.
Counter-force steelframe of the present invention all adopts hollow section or shaped steel with ribbing to be formed by connecting, and reduces overall weight under the premise ensureing integral rigidity, and method of attachment mainly welding and bolt connect, and bolt used is high-strength vibrationproof bolt.
As shown in Figure 8.Described axial Preload system includes axial jack, axial prestrain bar 9, drawing head 10 and axial locating ring 22.Described axial jack includes axial jack cylinder 16, hollow piston 18, sealing ring 29, unloading fuel tap 31, loads fuel tap 27 and air valve 32.
Described axial jack cylinder 16 is containing front grease chamber 28 and rear grease chamber 30, and described front grease chamber 28 communicates with loading fuel tap 27, and described rear grease chamber 30 communicates with unloading fuel tap 31；Two air valves 32 are separately mounted in described front grease chamber and rear grease chamber.
Described hollow piston 18 penetrates in the inner chamber of this axial jack cylinder, and makes the circumferential surface of piston head in the middle part of this hollow piston coordinate with the inner surface of axial jack cylinder；Between the inner surface of described piston head and axial jack cylinder, sealing ring 29 is installed.The hollow stem at described hollow piston two ends stretches out from the tapping at axial jack cylinder 16 two ends respectively.
The shaft of described axial prestrain bar 9 is divided into round rod segment, circle-side's variable cross-section section and square bar section.Round rod segment therein contacts with the waveguide rod of SHPB device, for transmitting the dynamic load of SHPB device；Described circle-side's variable cross-section section is the changeover portion that the shaft of this axial prestrain bar is gradually varied to square section by circular section；Described square bar section contacts with sample 21, and this sample is pressed.
Described round rod segment has the pressure-bearing shaft shoulder 28 of radially protruding, after one end of described axial prestrain bar 9 penetrates endoporus and the axial locating ring 22 of described hollow piston successively, the end face making the pressure-bearing shaft shoulder offsets with this hollow piston 18 one end end face, and drawing head 10 is sleeved on this axial prestrain bar, the inner face of drawing head and another end face of the pressure-bearing shaft shoulder is made to offset, thus realizing the axial location to described axial prestrain bar；Threaded between described drawing head and hollow piston.
Described axial locating ring 22 is round outside but spuare inside circulus, and square opening size and axial prestrain bar 9 square bar section sectional dimension match and pass for axial prestrain bar 9 square bar section and position.Described drawing head 10 is tube-in-tube structure, and one end bore size and axial prestrain bar 9 round rod segment sectional dimension match for its traverse, and the other end is threadeded with described hollow piston 18.
During work, hollow piston 18 is driven to move axially together with drawing head 10 by the axial jack cylinder 16 of described axial jack, thus driving axial prestrain bar 9 to move axially to apply axial load.Described axial Preload system is fixed on axial reaction frame 11 by ring-type fixing plate 8 by bolt 23, and it is coaxial with SHPB device waveguide rod, so that sample 21 is applied axial static load, described axial prestrain bar 9 can as the waveguide rod of axial impact impulsive load simultaneously, acquisition pulse waveform when Pasting foil gauge is for impact dynamic load effect on it.
Described radial direction Preload system includes radially jack and loading head 19.
Described radial direction jack has four, all includes radially jack cylinder 3, piston 20, sealing ring 29, unloading fuel tap 31, loading fuel tap 27 and air valve 32.
Described radial direction jack cylinder 3 comprises front grease chamber 28 and rear grease chamber 30, and wherein said front grease chamber 28 communicates with loading fuel tap 27, and rear grease chamber 30 communicates with unloading fuel tap 31；Described front grease chamber 28 and rear grease chamber 30 all there is air valve 32.
Described jack cylinder 3 is respectively charged in the fixing sleeve 2 of radial oil cylinders.The fixing sleeve of described each radial oil cylinders is fixed on the surface of assembling crossbeam 1 length direction medium position.The piston head of described each piston is respectively charged in the inner chamber of radially jack cylinder 3, and is sealed by sealing ring 29；The piston rod of described piston is placed through the hole, location 24 on assembling crossbeam 1, and makes matched in clearance therebetween.
The termination of described piston rod is convex hemispherical；One end of described loading head 19 is the multi-directional ball dish being made up of magnetic material, in recessed hemispherical, be fitted together to described piston 20 rod end magnetic and contact；The other end of described loading head contacts with sample 21, and face size matches with the specimen size contacted.
During work, driving piston 20 by the radial direction jack cylinder 3 of described radial direction jack, driving loading head 19 to translate thus applying radial load to sample 21.Described radial direction Preload system is fixed on assembling crossbeam 1 centre position by radial oil cylinders set tube end plate 25, radial bearing reaction frame 5 provide counter-force to support.The axis being axially perpendicular to SHPB device waveguide rod of described piston rod, for applying radially dead load to sample 21.
The present invention coordinates the work process carrying out true triaxial coupled static-dynamic loadingi to be with SHPB device: by controlling grease chamber before and after each axial jack cylinder 16, to form oil pressure poor, thus driving axial prestrain bar 9 moves axially and sample 21 is applied dead load；Control grease chamber's formation oil pressure before and after each radial direction jack cylinder 3 poor, thus driving the piston 20 of each radial direction jack to move radially sample 21 is applied dead load；When the dead load that sample is subject to reaches predetermined level, manipulation SHPB device applies Axial impact Load, shock pulse is conducted to the axial prestrain bar 9 of one end in the present invention by the incident bar of SHPB device, remake and use sample 21, it is then transmitted to the axial prestrain bar of the other end, through the take-off lever of SHPB device, energy-absorbing bar, finally absorbed by the energy absorber of SHPB device, complete Impulsive load process.The present invention can paste foil gauge with acquisition pulse ripple information on each axial prestrain bar 9, passes through the stress-strain diagram in gathered shock pulse acquisition of information sample 21 Impulsive load stage.
Claims (9)
1. the universal pre-adding system of true triaxial static load for split hopkinson press bar, it is characterised in that include body counter-force steelframe, axial Preload system, radially Preload system and guide track system；Described main body counter-force steelframe is described axial Preload system and the carrier of radial direction Preload system；This main body counter-force steelframe is arranged on the bracket of guide track system；Described axial Preload system has two sets, lays respectively at the two ends of described main body counter-force steelframe, and is arranged on the axial reaction frame of this main body counter-force steelframe；Described radial direction Preload system has four sets, is installed in the medium position of the assembling crossbeam length direction of described main body counter-force steelframe；The centrage of the central axis of the radial direction jack cylinder in described each radial direction Preload system axial prestrain bar in described axial Preload system.
2. as claimed in claim 1 for the universal pre-adding system of true triaxial static load of split hopkinson press bar, it is characterised in that described guide track system includes two brackets, moves radially guide rail for a pair, four two-way rollers and move axially guide rail a pair；Four wherein said two-way rollers be divided into two groups be placed in described in move radially on guide rail；The pair of guide rail that moves axially is separately mounted on two groups of two-way rollers；The two ends of two brackets are separately mounted to one and move axially on guide rail；Described move radially guide rail and be mutually perpendicular to moving axially guide rail；Described move axially the guide rail parallel axial prestrain bar in axial Preload system.
3. as claimed in claim 2 for the universal pre-adding system of true triaxial static load of split hopkinson press bar, it is characterized in that, described two-way roller is for overall by affixed for the turning rolls surface of two roller set, makes the roller in two roller set lay respectively at the upper and lower surface of this two-way roller；Described turning rolls is groove-like, has two pair roller mounting grooves on the wallboard of each turning rolls respectively；The axis of the roller of the described upper surface being positioned at this two-way roller is mutually perpendicular to the axis of the roller of the lower surface being positioned at this two-way roller；Having mounting platform respectively at the top of said two bracket, this mounting platform is connected by bolt with the radial bearing reaction frame in described main body counter-force steelframe.
4. as claimed in claim 1 for the universal pre-adding system of true triaxial static load of split hopkinson press bar, it is characterized in that, described main body counter-force steelframe includes two axial reaction frames, two radial bearing reaction framves, two axial oil cylinder fixed cover cylinders, four fixing sleeves of radial oil cylinders and four assembling crossbeams and T shaped connecting piece and I shape connector；Wherein, four middle parts assembling crossbeams and two ends are separately fixed on the end face of each T shaped connecting piece and I shape connector；Described each T shaped connecting piece is distributed on the circumference of each radial bearing reaction frame；Described each I shape connector is distributed on the circumference of each axial reaction frame；Said two axial oil cylinder fixed cover cylinder lays respectively at the two ends of described main body counter-force steelframe, and is fixed on each axial reaction frame by fixing plate；The fixing sleeve of described four radial oil cylinders is respectively through on the center being bolted to each assembling crossbeam length direction.
5. as claimed in claim 1 for the universal pre-adding system of true triaxial static load of split hopkinson press bar, it is characterised in that described axial Preload system includes axial jack, axial prestrain bar, drawing head and axial locating ring；Described axial jack includes axial jack cylinder, hollow piston, unloading fuel tap, loads fuel tap and air valve；Described axial jack cylinder contains front grease chamber and rear grease chamber, and described front grease chamber communicates with loading fuel tap, and described rear grease chamber communicates with unloading fuel tap；Described front grease chamber and rear grease chamber are separately installed with air valve；The inner surface of the circumferential surface of the piston head of described hollow piston and axial jack cylinder is joined sealing and is closed；
The hollow stem at described hollow piston two ends stretches out from the tapping at axial jack cylinder two ends respectively；Described axial prestrain bar loads in described hollow piston, and this one end stating axial prestrain bar passes from the end cap central of the drawing head being sleeved on described hollow piston；
Described round rod segment has the pressure-bearing shaft shoulder, after one end of described axial prestrain bar penetrates endoporus and the axial locating ring of round outside but spuare inside ring-type of described hollow piston successively, one end face of this pressure-bearing shaft shoulder and this hollow piston one end end face offset, and drawing head is sleeved on this axial prestrain bar, the inner face of drawing head and another end face of the pressure-bearing shaft shoulder is made to offset, thus realizing the axial location to described axial prestrain bar；Threaded between described drawing head and hollow piston；Described axial prestrain bar square bar section is crossed through the square opening of axial locating ring and is positioned.
6. as claimed in claim 5 for the universal pre-adding system of true triaxial static load of split hopkinson press bar, it is characterised in that the shaft of described axial prestrain bar is divided into round rod segment, circle-side's variable cross-section section and square bar section；Round rod segment therein contacts with the waveguide rod of SHPB device, for transmitting the dynamic load of SHPB device；Described circle-side's variable cross-section section is the changeover portion that the shaft of this axial prestrain bar is gradually varied to square section by circular section；Described square bar section and sample contacts, and this sample is pressed.
7. as claimed in claim 5 for the universal pre-adding system of true triaxial static load of split hopkinson press bar, it is characterized in that, described axial locating ring is round outside but spuare inside circulus, and square opening size and axial prestrain bar square bar section sectional dimension match and pass for axial prestrain bar square bar section and position；Described drawing head is tube-in-tube structure, and one end bore size and axial prestrain bar round rod segment sectional dimension match for its traverse, and the other end is threadeded with described hollow piston.
8. as claimed in claim 1 for the universal pre-adding system of true triaxial static load of split hopkinson press bar, it is characterised in that described radial direction Preload system includes four radially jack and loading heads；Described radial direction jack includes radially jack cylinder, piston, sealing ring, unloading fuel tap, loading fuel tap and air valve；
Described radial direction jack cylinder comprises front grease chamber and rear grease chamber, and wherein said front grease chamber communicates with loading fuel tap, and rear grease chamber communicates with unloading fuel tap；Described front grease chamber and rear grease chamber all there is air valve；
Described jack cylinder is respectively charged in the fixing sleeve of radial oil cylinders；The fixing sleeve of described each radial oil cylinders is fixed on the surface of assembling crossbeam length direction medium position；The piston head of described each piston is respectively charged in the inner chamber of radially jack cylinder, and is sealed by sealing ring；The piston rod of described piston is placed through the hole, location on assembling crossbeam, and makes matched in clearance therebetween.
9. as claimed in claim 8 for the universal pre-adding system of true triaxial static load of split hopkinson press bar, it is characterised in that the termination of described piston rod is convex hemispherical；One end of described loading head is the multi-directional ball dish being made up of magnetic material, in recessed hemispherical, be fitted together to described tailpiece of the piston rod magnetic and contact；The other end of described loading head and sample contacts, face size matches with the specimen size contacted.
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| CN201610202354.3A CN105716957A (en) | 2016-04-01 | 2016-04-01 | Universal type true-triaxial static load pre-loading system for split Hopkinson pressure bar |
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| CN201610202354.3A CN105716957A (en) | 2016-04-01 | 2016-04-01 | Universal type true-triaxial static load pre-loading system for split Hopkinson pressure bar |
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| CN105716957A true CN105716957A (en) | 2016-06-29 |
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| CN201610202354.3A Pending CN105716957A (en) | 2016-04-01 | 2016-04-01 | Universal type true-triaxial static load pre-loading system for split Hopkinson pressure bar |
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| CN110108571B (en) * | 2019-06-06 | 2024-02-02 | 中国人民解放军军事科学院国防工程研究院工程防护研究所 | Dynamic and static combined loading test device and test method |
| CN110108571A (en) * | 2019-06-06 | 2019-08-09 | 中国人民解放军军事科学院国防工程研究院工程防护研究所 | A kind of experimental rig and test method of coupled static-dynamic loadingi |
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Application publication date: 20160629 |