CN103353429A - Simple test-piece fatigue testing machine - Google Patents

Simple test-piece fatigue testing machine Download PDF

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Publication number
CN103353429A
CN103353429A CN2013102566118A CN201310256611A CN103353429A CN 103353429 A CN103353429 A CN 103353429A CN 2013102566118 A CN2013102566118 A CN 2013102566118A CN 201310256611 A CN201310256611 A CN 201310256611A CN 103353429 A CN103353429 A CN 103353429A
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CN
China
Prior art keywords
slide block
test
lever
column
base
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Application number
CN2013102566118A
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Chinese (zh)
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CN103353429B (en
Inventor
李洪双
夏爽
马远卓
王宇
赵安龙
郭麦萍
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南京航空航天大学
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Priority to CN201310256611.8A priority Critical patent/CN103353429B/en
Publication of CN103353429A publication Critical patent/CN103353429A/en
Application granted granted Critical
Publication of CN103353429B publication Critical patent/CN103353429B/en
Expired - Fee Related legal-status Critical Current
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Abstract

The invention discloses a simple test-piece fatigue testing machine, which relates to the technical field of material fatigue testing devices and in particular relates to the technical field of testing machines. According to the simple test-piece fatigue testing machine, a lever beam parallel to a base is connected to an upright post; a lower-end sliding rail is arranged on the base; a lower-end slide block is arranged on the lower-end sliding rail; a height adjusting mechanism is arranged above the lower-end slide block; a lower-end clamp is arranged above the height adjusting mechanism; an upper-end sliding rail is arranged on the lower end face of the lever beam; an upper-end slide block is arranged on the upper-end sliding rail; an upper-end clamp is arranged at the lower end of the upper-end slide block; a force transducer is arranged between the upper-end clamp and the upper-end slide block; a test piece is arranged between the upper-end clamp and the lower-end clamp; a reciprocating motion mechanism and a motor, which are connected with each other, are arranged on one side, which is far away from the upright post, of the base; a screw rod is arranged at one end, which is far away from the upright post, of the lever beam; a spring group is arranged between the screw rod and the reciprocating motion mechanism; a high-frequency driver connected with the motor is arranged on the upright post. The simple test-piece fatigue testing machine fulfills the aims of simple structure, low cost and easiness in measurement.

Description

A kind of simple and easy test specimen fatigue tester
Technical field
The present invention relates to the technical field of fatigue test of materials device, relate in particular to the technical field of testing machine.
Background technology
Be one of basic foundation of structure being carried out intensity and life-span calculating the fatigue lifetime of material, generally test specimen carried out destructive test to obtain data fatigue lifetime of material.For obtaining the equal life curve of material, need to carry out tens torture tests to test specimen, and consider material to the susceptibility of temperature, generally the fatigue load cycle frequency should not be set very high, therefore carrying out a test often needs several weeks, even the time of several years.Therefore the torture test cost is not only relevant with test specimen relevant cost, and closely related with the amortization charge of testing machine, and traditional hydraulic servo testing machine cost reaches hundreds thousand of Renminbi even up to a million yuans, so that the integrated cost of fatigue test of materials is high.
Summary of the invention
The object of the invention provides a kind of simple in structure, and cost is low, and the simple and easy test specimen fatigue tester that is easy to measure.
A kind of simple and easy test specimen fatigue tester, comprise L shaped framework, described L shaped framework comprises column, base, connect the lever beam parallel with base on the column, arrange the lower end slide rail on the base, arrange the lower end slide block on the slide rail of lower end, height adjustment mechanism is arranged in the top of lower end slide block, and the lower end anchor clamps are arranged in the top of height bindiny mechanism; The upper end slide rail is arranged in the lower surface of lever beam, arranges the upper end slide block on the slide rail of upper end, and upper end-fixture is arranged in the lower end of upper end slide block, arranges force cell between upper end-fixture and the upper end slide block; Arrange test specimen between upper end-fixture and the lower end anchor clamps; Side away from column on the base is arranged interconnective reciprocating mechanism, motor, and the end away from column on the lever beam is arranged screw rod, arranges groups of springs between screw rod and the reciprocating mechanism, and the high frequency driver that links to each other with motor is set on the column.
Be connected by Pivoting bearing between lever beam of the present invention and the column.
The present invention adopts technique scheme, compared with prior art has following advantage: a kind of simple and easy fatigue tester provided by the invention, simple in structure, reliability is high, and cost is very cheap, is suitable for very much the fatigue test of materials of long-time unmanned maintenance.The configuration adjustment of the fatigue load of testing machine is also very direct, can be easily changes the amplitude of stress ratio R and load by chucking position and prestrain screw rod, direct calibration test machine just after the elastic modulus that obtains material for test and size.The cost of a traditional servo-hydraulic testing machine is up to hundreds thousand of units, and the integrated cost of testing machine of the present invention is less than 20,000 yuan, can greatly reduce the depreciable cost of material fatigue testing machine, based on low-cost test machine provided by the invention, the mode of operation of Multi-Machine Synchronous test can be adopted, and then total testing time can be greatly reduced.
Description of drawings
Fig. 1 is a kind of structural representation of the present invention.
Among the figure: 1, L shaped framework, 2, the lower end anchor clamps, 3, height adjustment mechanism, 4, lower end slide block, 5, the lower end slide rail, 6, test specimen, 7, groups of springs, 8, reciprocating mechanism, 9, motor, 10, variable frequency drives, 11, Pivoting bearing, 12, the lever beam, 13, upper end slide block, 14, the upper end slide rail, 15, force cell, 16, upper end-fixture, 17, screw rod.
Embodiment
Below in conjunction with accompanying drawing technical scheme of the present invention is elaborated:
As shown in Figure 1, a kind of simple and easy test specimen fatigue tester, it is characterized in that comprising L shaped framework 1, described L shaped framework 1 comprises column, base, connect the lever beam 12 parallel with base on the column, arrange lower end slide rail 5 on the base, arrange lower end slide block 4 on the lower end slide rail 5, height adjustment mechanism 3 is arranged in the top of lower end slide block 4, and lower end anchor clamps 2 are arranged in the top of height bindiny mechanism 3; Upper end slide rail 14 is arranged in the lower surface of lever beam 12, arranges upper end slide block 13 on the upper end slide rail 14, and upper end-fixture 16 is arranged in the lower end of upper end slide block 13, arranges force cell 15 between upper end-fixture 16 and the upper end slide block 13; Arrange test specimen 6 between upper end-fixture 16 and the lower end anchor clamps 2; Arrange interconnective reciprocating mechanism 8, motor 9 away from a side of column on the base, end away from column on the lever beam 12 is arranged screw rod 17, arrange groups of springs 7 between screw rod 17 and the reciprocating mechanism 8, the high frequency driver 10 that links to each other with motor 9 is set on the column.
As shown in Figure 1, be connected by Pivoting bearing 11 between lever beam 12 of the present invention and the column.
The present invention adjusts the amplitude size of cyclic loading by the position that changes slide block that anchor clamps connect.The length that the present invention changes screw rod can be controlled the original upload size of cyclic loading, and original upload power is produced by groups of springs.The cyclic loading of demand of the present invention is produced by motor and reciprocating mechanism interlock.
The mechanism that the present invention produces cyclic loading is made of a series of groups of springs, reciprocating mechanism and motor that can compressed (or stretching), the power that these camber of springs produce acts on the lever beam by reciprocating mechanism, and the lever beam further is passed to load on the anchor clamps.
Upper lower clamp of the present invention to the horizontal range of lever beam fulcrum can change by the slide block on the shifting sledge.The size of the power on the test specimen and this distance are inversely proportional to, therefore the front size that can utilize the position control cyclic loading of anchor clamps.
The present invention is after test specimen installs, and the minimum load in the load cycle is produced by the spring that is in compression or extended state, and they have respectively threaded rod and the nut control of right-hand thread and left-hand thread by two covers.Under the situation of stress ratio 0<R<1 (La-La circulation), two screw rods should according to mutually away from the direction adjustment, produce precompression to spring this moment.For R〉1 (pressing-press circulation), screw rod is then by mutually close direction adjustment, like this so that spring is in the state of being stretched.Prestrain can directly be measured by force cell.
Prestrain stress σ on the test specimen In advanceMove into direct ratio with the initial position of loading system, namely screw displacement value x p, multiply by spring constant k and Leveraged rate P:
σ In advance≈ kPx p(1)
Compression (or stretching) the displacement d of groups of springs is added consideration, can obtain the suffered impulsive load σ of test specimen:
σ≈kP(d+x p)??(2)
Leveraged rate P is that loading spring and anchor clamps are to the ratio of the horizontal range of Pivoting bearing in the following formula.The compression of groups of springs (or stretching) displacement d is the instantaneous deformation displacement at testing machine duty medi-spring.Screw displacement value x pThe displacement of role of delegate when spring is intended to apply minimum load.
Screw displacement value x pCan use by two parameters and determine: stress ratio R, the compression of the groups of springs that screw displacement causes (or stretching) displacement d.Screw displacement value x pCan derive by following formula obtains, and wherein test piece deformation can be ignored:
R = σ min σ max = k x p k ( d + x p ) = x p d + x p
⇒ x p = Rd 1 - R - - - ( 3 )
In the following formula, stress ratio R is the suffered minimum load σ of test specimen in the process of the test MinWith maximum load σ MaxThe ratio.
(3) substitution formula (2) can be got the suffered impulsive load σ of test specimen:
σ ≈ kdP 1 - R - - - ( 4 )
Following formula shows that the load on the test specimen depends on stress ratio, Leveraged rate, the elastic constant of spring, the displacement of specimen stiffness and system.
If the suffered magnitude of load of test specimen can't satisfy the test demand, the number of springs that can change groups of springs significantly changes the suffered load of test specimen, and the accurate adjustment of load can be realized by changing the position of anchor clamps on slide rail.
The displacement of driving spring compression/stretching is produced by the motor drives linkage assembly, can generate sinusoidal cyclic loading, and load frequency is controlled by variable frequency drives.
Finish the configuration of testing machine according to the test demand after, make the testing machine continuous firing until the test specimen fatigure failure, by CYCLIC LOADING number of times and the corresponding stress curve of force cell record test specimen.

Claims (2)

1. simple and easy test specimen fatigue tester, it is characterized in that comprising L shaped framework (1), described L shaped framework (1) comprises column, base, connect the lever beam (12) parallel with base on the column, arrange lower end slide rail (5) on the base, the upper lower end slide block (4) of arranging of lower end slide rail (5), height adjustment mechanism (3) is arranged in the top of lower end slide block (4), lower end anchor clamps (2) are arranged in the top of height bindiny mechanism (3); Upper end slide rail (14) is arranged in the lower surface of lever beam (12), the upper upper end slide block (13) of arranging of upper end slide rail (14), upper end-fixture (16) is arranged in the lower end of upper end slide block (13), arranges force cell (15) between upper end-fixture (16) and the upper end slide block (13); Arrange test specimen (6) between upper end-fixture (16) and the lower end anchor clamps (2); Arrange interconnective reciprocating mechanism (8), motor (9) away from a side of column on the base, the upper end away from column of lever beam (12) is arranged screw rod (17), arrange groups of springs (7) between screw rod (17) and the reciprocating mechanism (8), the high frequency driver (10) that links to each other with motor (9) is set on the column.
2. simple and easy test specimen fatigue tester according to claim 1 is characterized in that being connected by Pivoting bearing (11) between above-mentioned lever beam (12) and the column.
CN201310256611.8A 2013-06-25 2013-06-25 A kind of Simple test-piece fatigue tester Expired - Fee Related CN103353429B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201310256611.8A CN103353429B (en) 2013-06-25 2013-06-25 A kind of Simple test-piece fatigue tester

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Application Number Priority Date Filing Date Title
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CN103353429B CN103353429B (en) 2015-12-09

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103837420A (en) * 2014-03-14 2014-06-04 唐山轨道客车有限责任公司 Pulse fatigue testing machine and fatigue testing device used by same
CN104034616A (en) * 2014-05-29 2014-09-10 河海大学 Electromagnetic type stay cable fatigue tester
CN104458116A (en) * 2014-12-03 2015-03-25 沈阳工业大学 Triangular wave force generator and force detection system feature test method thereof
CN105424526A (en) * 2015-12-29 2016-03-23 中国兵器科学研究院宁波分院 Corrosion fatigue environment test device
CN106404401A (en) * 2016-08-31 2017-02-15 北京精密机电控制设备研究所 Zero-position locking test device and test method for servo mechanism
CN107631946A (en) * 2017-09-07 2018-01-26 河海大学 A kind of testing machine pre-add power apparatus
CN110426300A (en) * 2019-07-30 2019-11-08 南京兆能节能科技有限公司 A kind of spring fatigue test device and method
CN111578892A (en) * 2020-04-13 2020-08-25 湖南省计量检测研究院 Strain gauge calibration device and method based on hydraulic element driving

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB939310A (en) * 1959-03-02 1963-10-09 British Iron Steel Research Improvements in or relating to fatigue testing machines
CN87210621U (en) * 1987-10-09 1988-03-30 东北工学院 Rotating bending fatigue tester with superimposed load
CN1414367A (en) * 2001-10-27 2003-04-30 宋玉泉 Lever type fixed load material testing machine
FR2918173A1 (en) * 2007-06-28 2009-01-02 Snecma Sa Tensile fatigue or creep testing machine for cylindrical rod shaped test tube, has mobile elements moved between two positions in controlled manner in which totality of mass is carried in one position and supported in other position
CN102507349A (en) * 2011-10-21 2012-06-20 南京航空航天大学 Micro fatigue testing machine with variable displacement control
CN102914478A (en) * 2012-10-30 2013-02-06 北京理工大学 Spring-lever energy storage type fatigue tension test machine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB939310A (en) * 1959-03-02 1963-10-09 British Iron Steel Research Improvements in or relating to fatigue testing machines
CN87210621U (en) * 1987-10-09 1988-03-30 东北工学院 Rotating bending fatigue tester with superimposed load
CN1414367A (en) * 2001-10-27 2003-04-30 宋玉泉 Lever type fixed load material testing machine
FR2918173A1 (en) * 2007-06-28 2009-01-02 Snecma Sa Tensile fatigue or creep testing machine for cylindrical rod shaped test tube, has mobile elements moved between two positions in controlled manner in which totality of mass is carried in one position and supported in other position
CN102507349A (en) * 2011-10-21 2012-06-20 南京航空航天大学 Micro fatigue testing machine with variable displacement control
CN102914478A (en) * 2012-10-30 2013-02-06 北京理工大学 Spring-lever energy storage type fatigue tension test machine

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103837420A (en) * 2014-03-14 2014-06-04 唐山轨道客车有限责任公司 Pulse fatigue testing machine and fatigue testing device used by same
CN103837420B (en) * 2014-03-14 2016-06-29 唐山轨道客车有限责任公司 Pulse fatigue testing machine fatigue experimental device and pulse fatigue testing machine
CN104034616A (en) * 2014-05-29 2014-09-10 河海大学 Electromagnetic type stay cable fatigue tester
CN104034616B (en) * 2014-05-29 2016-07-06 河海大学 A kind of electromagnetic type suspension cable fatigue machine
CN104458116A (en) * 2014-12-03 2015-03-25 沈阳工业大学 Triangular wave force generator and force detection system feature test method thereof
CN105424526A (en) * 2015-12-29 2016-03-23 中国兵器科学研究院宁波分院 Corrosion fatigue environment test device
CN106404401A (en) * 2016-08-31 2017-02-15 北京精密机电控制设备研究所 Zero-position locking test device and test method for servo mechanism
CN106404401B (en) * 2016-08-31 2019-04-09 北京精密机电控制设备研究所 A kind of servo mechanism zero-bit lock test device and test method
CN107631946A (en) * 2017-09-07 2018-01-26 河海大学 A kind of testing machine pre-add power apparatus
CN110426300A (en) * 2019-07-30 2019-11-08 南京兆能节能科技有限公司 A kind of spring fatigue test device and method
CN111578892A (en) * 2020-04-13 2020-08-25 湖南省计量检测研究院 Strain gauge calibration device and method based on hydraulic element driving

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