CN105758722A - Simple and stretching ratio adjustable type double-shaft synchronous stretching device and method - Google Patents
Simple and stretching ratio adjustable type double-shaft synchronous stretching device and method Download PDFInfo
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- CN105758722A CN105758722A CN201610107468.XA CN201610107468A CN105758722A CN 105758722 A CN105758722 A CN 105758722A CN 201610107468 A CN201610107468 A CN 201610107468A CN 105758722 A CN105758722 A CN 105758722A
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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
- 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 discloses a simple and stretching ratio adjustable type double-shaft synchronous stretching device and a method. The simple and stretching ratio adjustable type double-shaft synchronous stretching device comprises a horizontal frame, a stretching frame, a fixing frame and stretching components, wherein the horizontal frame, the stretching frame and the fixing frame are all arranged as orthogonality crossing frames; the fixing frame is mounted under the horizontal frame through positioning connection; the stretching frame is arranged according to the certain height of the stretching components to the upper side of the horizontal frame; four sets of stretching components are arranged and the stretching motion under the driving of the stretching frame is realized; each of the stretching components comprises a sliding rod, a sliding block and a clamp; the four sliding rods respectively pass through four arms of the horizontal frame; the two ends of the sliding rods are correspondingly hinged with the four arms of the stretching frame and the fixing frame one by one through pin shafts in a rotating form; four sliding blocks are respectively sleeved on four sliding rods in a relative sliding form and are arranged on the four arms of the horizontal frame at single degree of automation in horizontal sliding form; the four clamps are respectively in fixed connection with the four sliding blocks. The simple and stretching ratio adjustable type double-shaft synchronous stretching device has the advantages of compact structure, simple and easy form, stable running, low cost, adjustable stretching ratio and high double-shaft stretching precision.
Description
Technical field
The invention belongs to physical property technical field of measurement and test, relate to a kind of cross light sheet material stretching device, particularly a kind of easy, adjustable Dual-shaft synchronous stretching device of stretch ratio and method, it is adaptable to test application and production application.
Background technology
Stretching is the process that under tension on material or sample plane produces elongation under test or working condition, to obtain required test parameters and product.It is typically based on and needs to be divided into single shaft, twin shaft and multi-shaft stretching.
The consumption that makes of high-strength panel moulding material is greatly increased in recent years, in order to improve the finished product utilization rate of plate material parts, saves cost as much as possible, it is necessary to the forming ability of sheet material is carried out prediction reported as precisely as possible.The stressing conditions of panel beating is a kind of typical plane stress state, it is insecure that the mechanical property parameters obtained with uniaxial tension is used as the parameter of design and technology establishment, and much sheet material can produce anisotropy after rolling etc. processes, the conclusion causing uniaxial tensile test is difficult to the performance study of this type of sheet material, therefore, development more can be suitably used for predicting that the mechanical model by plane stress state sheet material mechanical behavior is just particularly important.Biaxial stretch-formed is that a kind of test method of emerging in recent years test flat sheet plastic forming ability mainly through applying to be mutually the power of certain relation in two mutually perpendicular directions, and measure sheet material deformability in this kind of stress situation, as the one reference of its plastic forming ability.It can thus be appreciated that biaxial stretch-formed be a kind of very suitable for studying sheet material by plane stress state time mechanical behavior means.
In prior art, many types are had: as by similar octahedral device for realizing biaxial stretch-formed equipment, loaded load on upper and lower two summits, each four braces up and down are driven to drive middle curciform specimen to carry out biaxial stretch-formed, this kind of device is only provided that the biaxial loadings of real-time 1:1, whole device is complex, and the rate of change moment of loaded load changes；Or become four motors of cross distribution or hydraulic press to drive four ends of curciform specimen to carry out biaxial stretch-formed within the same plane, the advantage of such device is in that can arbitrarily regulate the load proportion on two draw directions and loading velocity, but the electronic control system that whole device is required for sufficiently complex costliness carrys out coordinated operation, the complexity of device and cost is made to be greatly increased；Also by sheet material being carried out the mode that semiclosed hydraulic bulge test obtains the biaxial stretch-formed mechanics performance of material; this kind of mode not only can only carry out 1:1 load on rate; and need high-quality video camera and very complete protection device, and process costs can be increased, cost performance is relatively low.
Summary of the invention
In view of this, a kind of easy, the adjustable Dual-shaft synchronous stretching device of stretch ratio that it is an object of the invention to provide, excessively complicated or cannot the problem that loads of certainty ratio, constant speed rate for solving existing biaxial stretch-formed equipment, it it is a kind of Purely mechanical stretching device, have simple for structure, manufacturing cost and use cost is cheap, and stretch ratio is adjustable, stretch precision advantages of higher；Meanwhile, another object of the present invention is to additionally provide a kind of method that above-mentioned Dual-shaft synchronous stretching device carries out stretching, it is possible to realize the stretching of different proportion, constant speed rate, stretch data and result accurately to obtain.
For reaching above-mentioned purpose, the present invention is achieved through the following technical solutions:
nullThe present invention provides a kind of easy、The adjustable Dual-shaft synchronous stretching device of stretch ratio，Including horizontal stand、Draw frame、Fixed mount and stretching assembly，Described horizontal stand、Draw frame and fixed mount are orthogonal cross，Described fixed mount is arranged on below horizontal stand by being located by connecting，Described draw frame is being arranged from certain altitude above horizontal stand by stretching assembly，Described stretching assembly is four sets，Drive by draw frame and realize extensional motion，Including slide bar、Slide block and fixture，Four described slide bars are each passed through four arms of horizontal stand，Its two ends are rotating hinged with four arms difference one_to_one corresponding of draw frame and fixed mount by bearing pin，Being set on four slide bars of four described slide block relative slidings respectively、And horizontally slidable mode single-degree-of-freedom is arranged on four arms of horizontal stand，Four described fixtures are fixed with four slide blocks respectively and are connected.
Further, be located by connecting described in and fix connect be welding, rivet, be spirally connected or overlap in one or more combine.
Further, described slide block is provided with and coordinates the roller bolt slided with slide bar.
Further, the axis of described roller bolt is located between the end face of slide block and bottom surface.
Further, the surface of four arms of described horizontal stand is equipped with swallow-tail form or the straight in convex shape, and described slide block slides in straight.
Further, in the two-arm being oppositely arranged between two in described draw frame and fixed mount and be arranged at intervals with the pin-and-hole of several and described bearing pin coordination hinge respectively along its centrosymmetry.
Further, the two slide bar sizes being oppositely arranged between two are identical and identical with the angle of angle between draw frame respectively.
The present invention also provides for a kind of method that above-mentioned biaxial stretch-formed device carries out stretching, and comprises the steps: first, makes it be raised to proper height by giving described draw frame load straight up；Then, the fixture on four arms of described horizontal stand is clamped respectively four ends of cruciform specimen；Finally, make its downward uniform motion by giving described draw frame load straight down, thus driving cruciform specimen described in the sliding block pull in the four described stretching assemblies of set, finally realizing Dual-shaft synchronous stretching and loading.
Further, the angle of angle between slide bar and draw frame is changed by being arranged on draw frame and fixed mount the pin-and-hole of different spacing with the slide bar of different length and coordinating, thus changing slide block when draw frame moves downward to carry out the displacement ratio of horizontal orientation slip therewith, finally realizing the adjustable Dual-shaft synchronous stretching of stretch ratio and loading.
The invention has the beneficial effects as follows:
1, the present invention realizes the tensile loads of different stretch ratio by controlling the space geometry relation between slide bar and draw frame and fixed mount, solves existing biaxial stretch-formed equipment excessively complicated or cannot the problem that loads of certainty ratio, constant speed rate.
2, the present invention pushes slide block by slide bar and makes oriented sliding on the horizontal stand of orthogonal decussate texture, the clamp movement speed that can realize being oppositely arranged between two without additional any auxiliary equipment between its slide bar with slide block becomes fixed proportion in real time, simple for structure, operate steadily reliable.
3, the horizontal uniform motion of present invention slider is solely dependent upon the uniform descent motion of draw frame, and its form is succinct.
Generally speaking, the present invention is a kind of Purely mechanical stretching device, has compact conformation, the advantages such as manufacturing cost and use cost is cheap, it is possible to realize the stretching of different proportion, constant speed rate, stretches data and result accurately to obtain.
Other advantages of the present invention, target and feature will be illustrated to a certain extent in the following description, and to a certain extent, will be apparent to those skilled in the art based on to investigating hereafter, or can be instructed from the practice of the present invention.The target of the present invention and other advantages can be realized by description below and obtain.
Accompanying drawing explanation
In order to make the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail, wherein:
Fig. 1 is the structural representation of the biaxial stretch-formed device of the present invention；
The horizontal stand of accompanying drawing labelling: 1-, 101-connecting portion, 102-base, 103-connects assembly；2-draw frame；3-fixed mount；4-stretching assembly, 401-slide bar, 402-slide block, 403-fixture；5-bearing pin；6-pin-and-hole；7-roller bolt.
Detailed description of the invention
Below with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail；Should be appreciated that preferred embodiment is only for illustrating the present invention, rather than in order to limit the scope of the invention.
As shown in Figure 1, the present invention provides a kind of easy, adjustable Dual-shaft synchronous stretching device of stretch ratio, including horizontal stand 1, draw frame 2, fixed mount 3 and stretching assembly 4, described horizontal stand 1, draw frame 2 and fixed mount 3 are orthogonal cross, the center of they threes on same vertical centrage and the upper and lower one_to_one corresponding of its four arms arrange；Being provided with connecting portion 11 between the adjacent two-arm of described horizontal stand 1, by connecting, assembly 13 is fixing with base 12 to be connected four described connecting portions 11, and described connection assembly 13 is mainly made up of stud and nut；nullDescribed fixed mount 3 is arranged on below horizontal stand 1 by being located by connecting，Described draw frame 2 is being arranged from certain altitude above horizontal stand 1 by stretching assembly 4，Described stretching assembly 4 is four sets，Drive by draw frame 2 and realize extensional motion，Described draw frame 2 is realized its at the uniform velocity elevating movement in a vertical direction by external driving device，Including slide bar 401、Slide block 402 and fixture 403，Four described slide bars 401 are each passed through four arms of horizontal stand 1，Its two ends are rotating hinged with four arms difference one_to_one corresponding of draw frame 2 and fixed mount 3 by bearing pin 5，Four described slide block 402 relative slidings respectively be set on four slide bars 401 and horizontally slidable mode single-degree-of-freedom be arranged on four arms of horizontal stand 1，Namely four slide blocks 402 except doing oriented sliding along horizontal stand 1 arm at respective place，Not there is other degree of freedom，It is beneficial to realization to stretch；Four described fixtures 403 are fixed with four slide blocks 402 respectively and are connected, fixture 403 includes bracket (unmarked) and by screw (unmarked) connected pressing plate (unmarked), for clamping the arm end of cruciform specimen between described bracket and pressing plate, four described fixtures 403 are oppositely arranged between two, to realize midplane extrusion, belong to biaxial stretch-formed technology, repeat no more herein.
The present invention is in use, draw frame 1 is at the moved downward of driving device, drive four slide blocks 402 in the four described stretching assemblies 4 of set to make horizontal orientation to slide simultaneously, the direction of its slip is that the center away from horizontal stand 1 moves out, and loads realizing the fixture 403 Dual-shaft synchronous stretching to cruciform specimen.
In the present embodiment, described in be located by connecting employing welding, fixedly mount with horizontal stand 1 realizing fixed mount 3, it is ensured that be attached thereto operating steadily of slide bar 401；Described fixing being connected by overlaps, namely described slide block 402 and fixture 403 are linked together by the convex-concave structure of given shape, being easy to installation and the replacing of fixture, described given shape is: slide block 402 is provided with T-shaped groove, and fixture 403 is provided with and the T-shaped lap joint of described T-shaped groove snap fit.Certainly in various embodiments, it is located by connecting described in and fixes a kind of replacement or multiple in combination connecting in can also adopting riveted joint or being spirally connected.
In the present embodiment, described slide block 402 is provided with and coordinates the roller bolt 7 slided with slide bar 401, slide bar 401 is utilized can smooth transition to slide relative to slide block 402, make slide bar 401 that slide block 402 is produced pushing force, namely slide bar 401 transmits directed power to slide block 402 by pushing roller bolt 7 when moving downward, and at the uniform velocity moving downward of draw frame 2 can ensure that the constant level of slide block 402 moves, simple be exactly the potential energy converting and energy moved straight down by draw frame 2 of slide bar 401 is the kinetic energy that slide block 402 is horizontally away from that horizontal stand 1 center moves out, load thus realizing Dual-shaft synchronous stretching.The axis of described roller bolt 7 is located between end face and the bottom surface of slide block 402, when slide bar 401 passes through roller bolt 7 to slide block 402 imposed load, can ensure that roller bolt 7 does not fall out slide block 402, while reducing whole device complexity, improve its security reliability.
In the present embodiment, the surface of four arms of described horizontal stand 1 is equipped with the straight (unmarked) of swallow-tail form, described slide block 402 slides in straight, namely four slide blocks 402 are limited further except doing oriented sliding along horizontal stand 1 arm at respective place, not there is other degree of freedom, anti-limited slip block 402 is subject to slide bar 401 pushing force component upwards to drive and the straight on respective horizontal stand 1 arm that comes off, and is beneficial to and realizes tensile loads.
nullIn the present embodiment，In the two-arm being oppositely arranged between two in described draw frame 2 and fixed mount 3、And the pin-and-hole 6 of several and described bearing pin 5 coordination hinge it is arranged at intervals with respectively along its centrosymmetry，The slide bar 401 of two pairs of different lengths is assembled into the framework of given shape by bearing pin 5 and draw frame 2 and fixed mount 3 and is each passed through four arms of horizontal stand 1，Match the incompatible change slide bar 401 angle with draw frame 2 angle by adjusting the slide bar 401 of the pin-and-hole 6 and different length that are arranged on diverse location on draw frame 2 and fixed mount 3，And then change slide bar 401 when moving downward slide block 402 carry out the displacement ratio of horizontal movement therewith (such as 1:1，1:2，1:3，2:3，1:5 etc.)，Wherein，Two slide bar 401 sizes being oppositely arranged between two are identical、And it is identical with the angle of 2 angles of draw frame respectively，Opposing slider between two 402 to ensure conllinear does specular motion with the center of horizontal stand 1；Diverse location that on four arms of draw frame 2 and affixed frame 3, several pin-and-holes 6 are offered (i.e. distance between adjacent pin-and-hole 6 center of circle and near first pin-and-hole 6 center of circle at draw frame 2 or affixed frame 3 center and wherein distance in the heart) can according to the gradient of slide bar 401 and what required stretch ratio numerical value was determined.
The sample that the above-mentioned Dual-shaft synchronous stretching device of the present invention adopts is cruciform specimen, first its process carrying out Dual-shaft synchronous stretching work comprises the steps:, it is made to be raised to proper height by giving described draw frame 2 load straight up, to drive four slide blocks 402 overlapping in described stretching assemblies 4 to be inwardly directed sliding motion towards the center of horizontal stand 1, so that four fixture 403 opposed, inwardly directed motions between two, in order to clamping cruciform specimen；Then, the fixture 403 on four arms of described horizontal stand 1 is clamped respectively four ends of cruciform specimen；Finally, its downward uniform motion is made by giving described draw frame 2 load straight down, thus driving slide block 402 in the four described stretching assemblies of set 4 to be outwardly directed sliding motion away from the center of horizontal stand 1, and then make four fixtures 403 between two out against motion stretch described cruciform specimen, finally realize Dual-shaft synchronous stretching load.
The present embodiment changes the angle of angle between slide bar 401 and draw frame 2 also by being arranged on draw frame 2 and fixed mount 3 pin-and-hole 6 of different spacing with the slide bar 401 of different length and coordinating, thus changing slide block 402 when draw frame 2 moves downward to carry out the displacement ratio of horizontal orientation slip therewith, finally realizing the adjustable Dual-shaft synchronous stretching of stretch ratio and loading.
What finally illustrate is, above example is only in order to illustrate technical scheme and unrestricted, although the present invention being described in detail with reference to preferred embodiment, it will be understood by those within the art that, technical scheme can be modified or equivalent replacement, without deviating from objective and the scope of the technical program, it all should be encompassed in the middle of scope of the presently claimed invention.
Claims (9)
- null1. one kind easy、The adjustable Dual-shaft synchronous stretching device of stretch ratio，It is characterized in that: include horizontal stand、Draw frame、Fixed mount and stretching assembly，Described horizontal stand、Draw frame and fixed mount are orthogonal cross，Described fixed mount is arranged on below horizontal stand by being located by connecting，Described draw frame is being arranged from certain altitude above horizontal stand by stretching assembly，Described stretching assembly is four sets，Drive by draw frame and realize extensional motion，Including slide bar、Slide block and fixture，Four described slide bars are each passed through four arms of horizontal stand，Its two ends are rotating hinged with four arms difference one_to_one corresponding of draw frame and fixed mount by bearing pin，Being set on four slide bars of four described slide block relative slidings respectively、And horizontally slidable mode single-degree-of-freedom is arranged on four arms of horizontal stand，Four described fixtures are fixed with four slide blocks respectively and are connected.
- 2. easy, the adjustable Dual-shaft synchronous stretching device of stretch ratio according to claim 1, it is characterised in that: described in be located by connecting and fix connect be welding, rivet, be spirally connected or overlap in one or more combine.
- 3. easy, the adjustable Dual-shaft synchronous stretching device of stretch ratio according to claim 1, it is characterised in that: described slide block is provided with and coordinates the roller bolt slided with slide bar.
- 4. according to claim 3 easily, the adjustable Dual-shaft synchronous stretching device of stretch ratio, it is characterised in that: the axis of described roller bolt is located between the top and bottom of slide block.
- 5. according to claim 1 easily, the adjustable Dual-shaft synchronous stretching device of stretch ratio, it is characterised in that: the surface of four arms of described horizontal stand is equipped with swallow-tail form or the straight in convex shape, and described slide block slides in straight.
- 6. easy, the adjustable Dual-shaft synchronous stretching device of stretch ratio according to claim 1, it is characterised in that: in the two-arm being oppositely arranged between two in described draw frame and fixed mount and be arranged at intervals with the pin-and-hole of several and described bearing pin coordination hinge respectively along its centrosymmetry.
- 7. according to claim 6 easily, the adjustable Dual-shaft synchronous stretching device of stretch ratio, it is characterised in that: the two slide bar sizes being oppositely arranged between two are identical and identical with the angle of angle between draw frame respectively.
- 8. the drawing process according to arbitrary described easy, the adjustable Dual-shaft synchronous stretching device of stretch ratio of claim 1-7, it is characterised in that comprise the steps: first, make it be raised to proper height by giving described draw frame load straight up；Then, the fixture on four arms of described horizontal stand is clamped respectively four ends of cruciform specimen；Finally, make its downward uniform motion by giving described draw frame load straight down, thus driving cruciform specimen described in the sliding block pull in the four described stretching assemblies of set, finally realizing Dual-shaft synchronous stretching and loading.
- 9. as claimed in claim 8 easily, the drawing process of the adjustable Dual-shaft synchronous stretching device of stretch ratio, it is characterized in that: change the angle of angle between slide bar and draw frame by being arranged on draw frame and fixed mount the pin-and-hole of different spacing with the slide bar of different length and coordinating, thus changing slide block when draw frame moves downward to carry out the displacement ratio of horizontal orientation slip therewith, finally realizing the adjustable Dual-shaft synchronous stretching of stretch ratio and loading.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610107468.XA CN105758722B (en) | 2016-02-26 | 2016-02-26 | A kind of easy, the adjustable Dual-shaft synchronous stretching device of stretch ratio and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610107468.XA CN105758722B (en) | 2016-02-26 | 2016-02-26 | A kind of easy, the adjustable Dual-shaft synchronous stretching device of stretch ratio and method |
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| CN105758722A true CN105758722A (en) | 2016-07-13 |
| CN105758722B CN105758722B (en) | 2019-05-17 |
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| CN108489811A (en) * | 2018-03-29 | 2018-09-04 | 哈尔滨工业大学（威海） | Multidirectional automatic equal proportion stretches or compression set |
| CN108956290A (en) * | 2018-06-11 | 2018-12-07 | 哈尔滨工程大学 | The isometric extension test platform of rubber plane |
| CN108956268A (en) * | 2018-06-11 | 2018-12-07 | 西北工业大学 | stretching device |
| CN109342180A (en) * | 2018-12-17 | 2019-02-15 | 清华大学 | Multi-shaft stretching device |
| CN109406277A (en) * | 2018-11-15 | 2019-03-01 | 宁波大学 | A kind of biaxial stretch-formed test device of drop hammer type dynamic |
| CN109580358A (en) * | 2019-01-24 | 2019-04-05 | 中汽研（天津）汽车工程研究院有限公司 | Test device is compressed in a kind of quiet dynamic bidirectional face of board-like material |
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| CN109855954A (en) * | 2018-12-19 | 2019-06-07 | 西南石油大学 | It is uniaxially stretched and converts biaxial stretch-formed experimental provision |
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| CN108489811A (en) * | 2018-03-29 | 2018-09-04 | 哈尔滨工业大学（威海） | Multidirectional automatic equal proportion stretches or compression set |
| CN108489811B (en) * | 2018-03-29 | 2024-03-22 | 哈尔滨工业大学（威海） | Multidirectional automatic equal-proportion stretching or compressing device |
| CN108956290A (en) * | 2018-06-11 | 2018-12-07 | 哈尔滨工程大学 | The isometric extension test platform of rubber plane |
| CN108956268A (en) * | 2018-06-11 | 2018-12-07 | 西北工业大学 | stretching device |
| CN109406277A (en) * | 2018-11-15 | 2019-03-01 | 宁波大学 | A kind of biaxial stretch-formed test device of drop hammer type dynamic |
| CN109406277B (en) * | 2018-11-15 | 2024-03-29 | 宁波大学 | Drop hammer type dynamic biaxial stretching testing device |
| CN109342180B (en) * | 2018-12-17 | 2019-07-26 | 清华大学 | Multi-shaft stretching device |
| CN109342180A (en) * | 2018-12-17 | 2019-02-15 | 清华大学 | Multi-shaft stretching device |
| CN109855954A (en) * | 2018-12-19 | 2019-06-07 | 西南石油大学 | It is uniaxially stretched and converts biaxial stretch-formed experimental provision |
| CN109855954B (en) * | 2018-12-19 | 2021-06-22 | 西南石油大学 | Uniaxial tension-to-biaxial tension experimental device |
| CN109580358A (en) * | 2019-01-24 | 2019-04-05 | 中汽研（天津）汽车工程研究院有限公司 | Test device is compressed in a kind of quiet dynamic bidirectional face of board-like material |
| CN109738318A (en) * | 2019-02-15 | 2019-05-10 | 内蒙古工业大学 | A kind of hydraulic structure anti-current water erosion test device and its test method |
| CN109779063A (en) * | 2019-03-07 | 2019-05-21 | 重庆恩倍克科技有限公司 | A kind of damping damping unit and the damping damping mechanism for building shock-damping energy-dissipating |
| CN109916713A (en) * | 2019-04-01 | 2019-06-21 | 燕山大学 | A kind of cross compression specimen holder and loading method for Biaxial stress system |
| CN112461652A (en) * | 2020-11-06 | 2021-03-09 | 中国人民解放军火箭军工程大学 | Material performance testing device and method for converting uniaxial drive into biaxial variable-ratio stretching |
| CN112461652B (en) * | 2020-11-06 | 2024-03-19 | 中国人民解放军火箭军工程大学 | Testing device and method for converting uniaxial drive into biaxial variable-proportion stretching |
| CN113281167A (en) * | 2021-05-19 | 2021-08-20 | 中南大学 | Experimental device and method for realizing bidirectional uniform-speed stretching or compression loading |
| CN113799377A (en) * | 2021-11-18 | 2021-12-17 | 沈阳新智源医疗用品有限公司 | Automatic tensile laminating equipment of pipe |
| CN114397176A (en) * | 2022-01-07 | 2022-04-26 | 广西大学 | Cross loading fatigue test fixture with adjustable steering load ratio |
| CN114397176B (en) * | 2022-01-07 | 2023-08-01 | 广西大学 | Cross loading fatigue test fixture with adjustable steering load ratio |
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