CN105067428B - For elastic material crack initiation life testing machine and use its method - Google Patents
For elastic material crack initiation life testing machine and use its method Download PDFInfo
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- CN105067428B CN105067428B CN201510497139.6A CN201510497139A CN105067428B CN 105067428 B CN105067428 B CN 105067428B CN 201510497139 A CN201510497139 A CN 201510497139A CN 105067428 B CN105067428 B CN 105067428B
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Abstract
The invention discloses a kind of crack initiation life testing machines for elastic material, belong to automotive engineering field.The crack initiation life testing machine includes fatigue tester and optical measuring device, fatigue tester is used to carry out fatigue test to test specimen, optical measuring device is configured to the crack propagation situation of the monitoring test sample in fatigue test, and based on the stress fatigue life curve figure and crack initiation life of test data and crack propagation situation acquisition test specimen during fatigue test.Crack initiation life testing machine provided by the present invention for elastic material and it can once carry out multiple sample fatigue loadings using its method and testing efficiency is high；It uses contactless optical to measure sample fatigue loading during the test to strain so that result is more acurrate；And using the appearance of the real-time monitoring crack of picture pick-up device, and then more accurately record fatigue life；Experiment can be detected to be detected since exemplar caused by stress softening and hysteresis changes without shutting down in the process.
Description
Technical field
The present invention relates to automotive engineering fields, more particularly to are used for crack initiation life testing machine and the use of elastic material
Its method.
Background technology
The destruction of material is a process.Destructive process is cracked later simultaneously since internal flaw occurs in material
And crackle gradually extends, until the complete rupture failure of structure of material.And crackle is from occurring this stage of visible fine crack
The referred to as germinating stage of crackle；It is the crack propagation stage to be destroyed completely from visible crack to structure；The complete fracture of crackle so that
There is the phenomenon that fracture failure in material, so that people increasingly pay attention to the life problems of material.
In recent years, about the theoretical increasingly ripe of crack initiation, application industrially is also more and more extensive so that accurate
Predict that the initiating life of crackle becomes an important problem.It is general using using MTS test systems and moral on the market at present
The experimental machine of Moses's subgroup is detected.
In the implementation of the present invention, the inventor finds that the existing technology has at least the following problems：
(1) using the exemplar number using MTS test system one-shot measurements than relatively limited, and it is not easy directly to observe crackle
Growth course.And crack initiation cannot be determined accurately in detection process；
(2) it uses the experimental machine of moral Moses's subgroup in strain measurement and crack initiation identification is upper relatively difficult.
Invention content
In order to solve at least one aspect of the above-mentioned problems in the prior art and defect, the present invention provides one kind
For elastic material crack initiation life testing machine and use its method.The technical solution is as follows：
It is an object of the present invention to provide a kind of crack initiation life testing machines for elastic material.
There is provided a kind of sides using the crack initiation life testing machine for elastic material for a further object of the present invention
Method.
According to an aspect of the invention, there is provided a kind of crack initiation life testing machine for elastic material, described
Crack initiation life testing machine includes fatigue tester and optical measuring device, the fatigue tester be used for test specimen into
Row fatigue test, the optical measuring device are configured to the crack propagation situation of the monitoring test sample in the fatigue test,
And based on during the fatigue test test data and the crack propagation situation stress-that obtains the test specimen it is tired
Labor life curve figure and crack initiation life.
Further, the crack initiation life testing machine further includes clamping device, and the clamping device includes upper grip
With lower collet, the test specimen is fixed on the fatigue tester by the upper grip and lower collet and carries out tired examination
It tests.
Further, the crack initiation life testing machine further includes cupping machine, is passed through before the fatigue test
Test specimen is fixed on the cupping machine and carries out tension test by the upper grip and lower collet, to obtain the test sample
The stress-strain curve of product.
Further, the clamping device uses multistation clamping, and primary experiment being capable of the multiple test specimens of clamping.
Specifically, the optical measuring device includes：
Photographic device, by shooting the state picture in the fatigue test of the test specimen, for handling
The strain of the test specimen and the size of crackle are measured when test data；
Fatigue numeration module, the fatigue numeration module are used to count the fluctuating circulating stress in the fatigue test
Number is loaded, to calculate the fatigue life of the test specimen；
Crack monitoring module, the crack monitoring module are used for after fatigue tester startup, pass through the state
Picture monitors the crack propagation situation on the test specimen；
Control and human-computer interaction module, the control are used to carry out human-computer interaction with human-computer interaction module, and tired in progress
Before labor experiment, the threshold value of crackle is preset in the control and human-computer interaction module,
In fatigue test, when the crackle reaches preset threshold value, the pulsating cyclic for recording the test specimen is answered
The state picture of the load number and corresponding crack initiation of power, the pulsating cyclic when the crackle reaches preset threshold value are answered
The load number of power is the crack initiation life of the test specimen.
Specifically, the optical measuring device further includes lighting source, and the state is being shot for the photographic device
Supplementary light when picture,
The photographic device is CCD camera,
In the fatigue test, the lighting source and the CCD camera are arranged before the test specimen；
The elastic material includes rubber material.
Further, before the test, two mark lines are set in the width direction on the test specimen, and described in measurement
The distance between two mark lines, the elongation strain for the test specimen can be obtained in fatigue test.
Specifically, the optical measuring device further includes:
Image buffer storage and processing module, described image processing module is for caching the state picture；
The state picture is transmitted to described image by image pick-up card, the photographic device by described image capture card
In caching and processing module；
The state picture is sent to described image by the interface module and delayed by interface module, described image capture card
It deposits and processing module；
Strain measurement module, the strain measurement module measure the experiment when the cupping machine carries out tension test
The elongation strain of sample, two label of the strain measurement module extraction described in fatigue test after each stress loading
The feature of line, and obtain the distance between described two mark lines at this time；
Memory module, the memory module are used to record the data of the stress and strain of the test specimen and the fatigue
The load number for the fluctuating circulating stress that testing machine is applied；
Described image caches and processing module, interface module, strain measurement module, fatigue numeration module, crack monitoring mould
Block and memory module are controlled by the control with human-computer interaction module.
According to another aspect of the present invention, it is sprouted using the above-mentioned crackle for elastic material the present invention also provides a kind of
The method of raw life test machine, the method includes the following steps：
(1) along the width direction of the test specimen, two mark lines are set on the surface of the test specimen
The distance between and measure two mark lines；
(2) test specimen is stretched to by maximum position by the cupping machine, and passes through the strain measurement
Module obtains the elongation strain of the test specimen at this time, and the elongation strain data obtained are saved in the storage later
In module；
(3) start the fatigue tester and start to load, while the fatigue numeration module start recording pulsation being made to follow
The load number of Zernike annular polynomial；
(4) pre-set in the control and human-computer interaction module scheduled pulsating stress cycle load number it
Afterwards, start the crack monitoring module, while the photographic device is controlled with human-computer interaction module by the control, make described
Photographic device captures the state picture of the test specimen according to certain frequency, and the state picture storage of candid photograph is arrived
In described image caching and processing module；
(5) the crack monitoring module carries out crackle knowledge to described image caching with the state picture in processing module
Not, when recognizing the crackle more than the threshold value of setting, stop monitoring to the test specimen, and by pulsating cyclic at this time
The load number of stress and the state picture of corresponding crack initiation are saved in the memory module；
(6) continue to be monitored other test specimens, until all test specimen total Tests finish.
Further, during the fatigue test, the strain measurement module is cached and is handled from described image
Extraction section test data in module and the memory module, to calculate the test specimen described in the pilot process of fatigue test
Elongation change situation；
Further include by the fluctuating circulating stress and fluctuating circulating stress cycle to being loaded after step (5) or (6)
Load number carry out data processing to obtain pulsating cyclic fatigue life, and convert pair the pulsating cyclic fatigue life to
Claim cycle fatigue life.
The advantageous effect of technical solution provided by the invention is：
(1) provided by the present invention for the crack initiation life testing machine of elastic material and using its method can be primary
The fatigue loading of multiple samples is carried out, and testing efficiency is high；
(2) it is connect provided by the present invention for the crack initiation life testing machine of elastic material and using its method using nothing
The fatigue loading of tactile optical measurement sample strains so that result is more accurate；
(3) provided by the present invention for the crack initiation life testing machine of elastic material and using its method using camera shooting
The appearance of the real-time monitoring crack of equipment can more accurately record fatigue life number；
(4) it can be detected provided by the present invention for the crack initiation life testing machine of elastic material and using its method
Since exemplar caused by stress softening and hysteresis changes during experiment, and it is detected without shutting down.
Description of the drawings
Fig. 1 is that the structure of the crack initiation life testing machine according to an embodiment of the invention for elastic material is shown
It is intended to；
Fig. 2 is the structural schematic diagram of the clamping device shown in FIG. 1 for being fixed with test specimen；
Fig. 3 is the structural schematic diagram of computer shown in FIG. 1；
Fig. 4 is the side according to an embodiment of the invention using the crack initiation life testing machine for elastic material
The flow chart of method.
Wherein, the 100 crack initiation life testing machine for elastic material, 10 optical measuring devices, 11 test specimens,
112 mark lines, 12 photographic devices, 13 lighting sources, 14 image pick-up cards, 15 computers, 151 interface modules, 152 image buffer storages
With processing module, 153 fatigue numeration modules, 154 crack monitoring modules, 155 strain measurement modules, 156 memory modules, 157 controls
System and human-computer interaction module, 20 clamping devices, 21 upper grips, 22 times collets.
Specific implementation mode
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
Referring to Fig. 1, it illustrates the crack initiation life examinations according to an embodiment of the invention for elastic material
Test machine 100.Crack initiation life testing machine 100 includes fatigue tester (not shown) and optical measuring device 10.Fatigue test
Machine is used to carry out fatigue test to test specimen 11；Optical measuring device 10 is configured to the monitoring test sample in fatigue test
11 crack propagation situation, and based on the test data and the crack propagation situation acquisition test specimen during fatigue test
Stress-Fatigue Life Curve figure and crack initiation life.
As shown in Fig. 2, crack initiation life testing machine 100 further includes clamping device 20 and cupping machine (not shown),
Specifically, clamping device 20 includes upper grip 21 and lower collet 22.At the trial, make upper grip 21 and lower collet 22 that will try first
It tests sample 11 and is fixed on cupping machine and carry out tension test, to obtain the stress-strain curve of test specimen 11；Later
The upper grip 21 for being fixed with test specimen 11 and lower collet 22 are fixed on fatigue tester (not shown) and carry out fatigue test
With the crack initiation life for obtaining test specimen 11.
In the example of the present invention, when handling test data, the stress-strain curve and stress-of acquisition are tired
Labor life curve figure is made for example, by founding mathematical models or by computer simulation to deduce of elastic material
Practical parts fatigue life and crack initiation life.
In another example of the present invention, clamping device is elastic material (such as rubber material) dedicated clamping device,
It uses multistation clamping, and primary experiment being capable of the multiple test specimens of clamping 11 so that at the trial can be multiple with one-shot measurement
Test specimen 11.
With continued reference to Fig. 2, before the test, two mark lines 112 are set in the width direction on test specimen 11 first, and
The distance between so that two mark lines 112 is made when test specimen 11 is free state, and measure two mark lines, it is used for energy
Enough elongation strains that test specimen is obtained in fatigue test.
In conjunction with shown in Fig. 1 and Fig. 3, optical measuring device 10 includes photographic device 12, lighting source 13, image pick-up card
14, interface module 151, image buffer storage and processing module 152, fatigue numeration module 153, crack monitoring module 154, strain measurement
Module 155, memory module 156 and control and human-computer interaction module 157.It will be understood by those skilled in the art that optical measurement fills
Data processing module, such as computer 15 (as shown in Figure 1) can also be separately provided by setting 10, and make data processing module (example
Such as computer 15) include interface module 151, image buffer storage and processing module 152, fatigue numeration module 153, crack monitoring module
154, strain measurement module 155, memory module 156 and control and human-computer interaction module 157.This example is only a kind of exemplary theory
It is bright, it is not construed as a kind of limitation to the present invention.
Specifically, photographic device 12 is placed on before test specimen 11 (as shown in Figure 1) when carrying out fatigue test, is used
In the state picture in fatigue test of shooting test specimen 11.Design in this way, when optical measuring device 10 is being located
When managing test data, strain that can be by captured state image measurement test specimen and flaw size size, and
The appearance of crackle and the spread scenarios of crackle can also be monitored in real time.In order to supplement illumination brightness when shooting, can also test
Lighting source 13 is placed before sample.
In the example of the present invention, photographic device 12 is CCD camera.Due to being arranged in optical measuring device 10
There is camera so that be capable of the appearance of real-time monitoring crack during the test, can more accurately record test specimen in this way
Fatigue life.
When carrying out fatigue test, photographic device 12 connects the state picture of acquisition through image pick-up card 14 by data line
It is connected in computer 15, is interacted with the control program inside computer.When transmitting state picture, pass through interface module
151 realize the reading and writing data with image pick-up card 14, and state picture is made to pass sequentially through image pick-up card 14 and the biography of interface module 151
Image buffer storage is sent to processing module 152, image buffer storage is made to realize the caching to state picture, the figure with processing module 152
As caching is also equipped with the functions such as binaryzation, noise reduction with processing module 152.In the example of the present invention, interface module 151 is
I/O interface modules, certainly it will be apparent to those skilled in the art that interface module can also be usb interface module, input/defeated
Outgoing interface module etc., those skilled in the art can be selected accordingly as needed, this example is only a kind of illustrative
Example is not construed as a kind of limitation to the present invention.
For fatigue life test, load strain is very big for material lifetime influence, and for common
Tensile testing machine and durable testing machine, cannot all measure stress and strain when load very accurately.This is because a side
Face, common extensometer be only capable of measure before the test or measure before strain, cannot measure experiment load in strain.Such as
Fruit fatigue test needs to measure the strain in experiment load, is measured then can only shut down；On the other hand, due to materials such as rubber
The exemplar clamping deformation ratio of material is larger, and since the materials such as rubber are relatively soft so that the precision of strain measurement is not high.It there is now
Experiment shows the error due to strain 10% so that causes the error of material lifetime at double, therefore fatigue test is necessarily required to newly
Method more accurately measure and controlled strain.Part test machine is equipped with Video Extensometer, can be with noncontacting measurement exemplar
Strain, but do not have control and the numeration function of the Identification of Cracks function and fatigue test of fatigue test needs, as a result, at this
In the design of invention, fatigue numeration module 153, crack monitoring module 154 and strain measurement module 155 are additionally provided.
Fatigue numeration module 153 is used to count the load number of the fluctuating circulating stress in fatigue test, to calculate
The fatigue life of test specimen 11.When fatigue numeration module handles test data, using the methods of SWT by acquisition
The pulsating cyclic service life is changed into the symmetrical cycle service life, and records the fatigue life deployment conditions under same strain, provides later general
Rate counts.Fatigue numeration module 153 can be calculated from the initial time of on-test, can also by I/O interface modules with it is tired
The communication of labor testing machine obtains, and those skilled in the art can be selected accordingly as needed.
Crack monitoring module 154 is used for after fatigue tester startup, and crack monitoring module 154 is from image buffer storage and handles
It obtains state picture in module 152, and Identification of Cracks is carried out with the crack propagation situation on monitoring test sample to state picture,
Realize the real time monitoring for occurring to crackle and extending.It is pre- in control and human-computer interaction module 157 before carrying out fatigue test
After making the load number of certain fluctuating circulating stress, start crack monitoring module 154, while photographic device 12 is by control and people
The clock control of machine interactive module 157, and test specimen 11 is captured according to certain frequency, capture obtained state
Picture is practical to be stretched to utmostly corresponding state picture for test specimen 11.After shooting state picture, crackle prison
It surveys the time of module 154 or 12 records photographing state picture of photographic device, and by the test data and arteries and veins of the time obtained
In the load number storage to memory module 156 of dynamic pulsating stress, by the state picture storage of acquisition to image buffer storage and processing
In module 152.
After the storage to image buffer storage and processing module 152 of state picture, crack monitoring module 154 is slow to being saved in image
It deposits and carries out Identification of Cracks with the state picture in processing module 152.When recognizing the crackle more than setting threshold value, stop to this
The monitoring of test specimen, and the state image data of the load number of fluctuating circulating stress at this time and the crackle of candid photograph is preserved
The load number of fluctuating circulating stress into memory module, and at this time is the crack initiation life of test specimen 11.
In the example of the present invention, the threshold value of preset crackle is flaw size size, works as crack monitoring
When module 154 recognizes the flaw size in state picture more than preset flaw size, stop to the test sample
The monitoring of product, and the state image data of the load number of fluctuating circulating stress at this time and the crack initiation of candid photograph is saved in
In memory module, to obtain the state picture of crack initiation life and crack initiation, it is furthermore achieved to crack initiation
Real time monitoring.
The stretching that strain measurement module 155 is used to measure the test specimen when cupping machine carries out tension test is answered
Become, the test data of the elongation strain obtained numbers according to certain format and keeps reaching in memory module.It is tried stretching
Elongation strain obtained in testing is used for the calculating of Fatigue Life Curve.
During carrying out fatigue test, strain measurement module 155 is answered using the extraction of video derivative method every time
The feature of two mark lines after power load, to obtain the distance between two mark lines at this time.When handling test data,
By the distance between two after the stress loading mark line of acquisition, calculates and obtain corresponding elongation strain.In this way
Design make it possible at the trial be not necessarily to shut down, you can measure experiment during carrying out fluctuating circulating stress load
The elongation strain of sample 11.
Memory module 156 records the load time of stress and strain data, tired fluctuating circulating stress that elongation strain measures
Number data, the control data of intermediate data and control and human-computer interaction module 157.Control with human-computer interaction module 157 be used for into
Row human-computer interaction, and control interface module 151, image buffer storage and processing module 152, fatigue numeration module 153, crack monitoring mould
Block 154, strain measurement module 155 and memory module 156.
Referring to Fig. 4, it illustrates the flows for the method for using the crack initiation life testing machine for elastic material.It uses
The step of method for the crack initiation life testing machine of elastic material includes：
(1) clamping device 20 is connected to cupping machine, by the photographic device 12 and illumination light in optical measuring device 10
Source 13 is positioned over before test specimen 11, and the test specimen item tailored is marked, is installed to above grip device 20,
The distance between mark line has already passed through measurement at this time, i.e., the distance is known quantity；
(2) cupping machine is stretched to maximum position, each test sample at this time is measured using strain measurement module 155
The elongation strain data obtained are saved in by certain format number in memory module 156 by the elongation strain of product 11 later；
(3) start fatigue tester and start to load, while making fatigue numeration 153 start recording of module load number；
(4) it opens controlling and pre-set in human-computer interaction module 157 after scheduled fluctuating circulating stress loads number
Dynamic crack monitoring module 154, while photographic device 12 is controlled by control and human-computer interaction module 157, make photographic device 12 by
The state picture of test specimen 11 is captured according to certain frequency, and by the state picture of candid photograph storage to image buffer storage and handles mould
In block 152；
(5) crack monitoring module 154 carries out Identification of Cracks to the state picture in image buffer storage and processing module 152, when
When recognizing the crackle more than the threshold value of setting, stop the monitoring to test specimen, and adding fluctuating circulating stress at this time
The state picture for carrying number and corresponding crack initiation is saved in memory module 156；
(6) continue to be monitored other test specimens, until all test specimen total Tests finish.
In the example of the present invention, during fatigue test, strain measurement module 155 is from image buffer storage with from
Extraction section test data in module 152 and memory module 156 is managed, to calculate the test specimen in the pilot process of fatigue test
11 elongation change situation.The elongation that could also say that test specimen 11 (is extended by the elongation change situation of acquisition
Amount) calculate obtain pilot process in test specimen strain, due to it is such design make it possible to obtain fatigue test into
Row fluctuating circulating stress is not necessarily to shut down during loading, you can obtains the strain of test specimen during the loading procedure.
Further include by the pulsating cyclic to being applied after step (5) or (6) in another example of the present invention
The load number of stress and fluctuating circulating stress carries out data processing to obtain pulsating cyclic fatigue life, is fitted the tired longevity later
Fate evidence converts pulsating cyclic fatigue life to the cyclic deformation service life.
The advantageous effect of technical solution provided by the invention is：
(1) provided by the present invention for the crack initiation life testing machine of elastic material and using its method can be primary
The fatigue loading of multiple samples is carried out, and testing efficiency is high；
(2) it is connect provided by the present invention for the crack initiation life testing machine of elastic material and using its method using nothing
The fatigue loading of tactile optical measurement sample strains so that result is more accurate；
(3) provided by the present invention for the crack initiation life testing machine of elastic material and using its method using camera shooting
The appearance of the real-time monitoring crack of equipment can more accurately record fatigue life number；
(4) it can be detected provided by the present invention for the crack initiation life testing machine of elastic material and using its method
Since exemplar caused by stress softening and hysteresis changes during experiment, and it is detected without shutting down.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of crack initiation life testing machine for elastic material, which is characterized in that
The crack initiation life testing machine includes fatigue tester and optical measuring device, and the fatigue tester is used for examination
It tests sample and carries out fatigue test, the crackle that the optical measuring device is configured to the monitoring test sample in the fatigue test expands
Open up situation, and based on during the fatigue test test data and the crack propagation situation obtain the test specimen
Stress-Fatigue Life Curve figure and crack initiation life；
The optical measuring device includes：
Photographic device, by shooting the state picture in the fatigue test of the test specimen, for being tested in processing
The strain of the test specimen and the size of crackle are measured when data；
Fatigue numeration module, the fatigue numeration module are used to count the load of the fluctuating circulating stress in the fatigue test
Number, to calculate the fatigue life of the test specimen；
Crack monitoring module, the crack monitoring module are used for after fatigue tester startup, pass through the state picture
Monitor the crack propagation situation on the test specimen；
Control and human-computer interaction module, the control is used to carry out human-computer interaction with human-computer interaction module, and is carrying out tired examination
Before testing, the threshold value of crackle is preset in the control and human-computer interaction module,
In fatigue test, when the crackle reaches preset threshold value, the fluctuating circulating stress of the test specimen is recorded
The state picture of number and corresponding crack initiation is loaded, fluctuating circulating stress when the crackle reaches preset threshold value
Load the crack initiation life that number is the test specimen；
The optical measuring device further includes:
Image buffer storage and processing module, described image processing module is for caching the state picture；
The state picture is transmitted to described image caching by image pick-up card, the photographic device by described image capture card
With in processing module；
Interface module, described image capture card by the interface module by the state picture be sent to described image caching with
Processing module；
Strain measurement module, the strain measurement module measure the drawing of the test specimen when cupping machine carries out tension test
Stretching strain, the feature of two mark line of the strain measurement module extraction after each stress loading described in fatigue test, and
Obtain the distance between described two mark lines at this time；Before the test, it is arranged two in the width direction on the test specimen
The distance between mark line, and measure two mark lines, for the test specimen can be obtained in fatigue test
Elongation strain；
Memory module, the memory module are used to record the data of the stress and strain of the test specimen and the fatigue test
The load number for the fluctuating circulating stress that machine is applied；
Described image cache with processing module, interface module, strain measurement module, fatigue numeration module, crack monitoring module and
Memory module is controlled by the control with human-computer interaction module.
2. the crack initiation life testing machine according to claim 1 for elastic material, which is characterized in that
The crack initiation life testing machine further includes clamping device, and the clamping device includes upper grip and lower collet, described
Test specimen is fixed on the fatigue tester by the upper grip and lower collet and carries out fatigue test.
3. the crack initiation life testing machine according to claim 2 for elastic material, which is characterized in that
The crack initiation life testing machine further includes cupping machine, before the fatigue test by the upper grip under
Test specimen is fixed on the cupping machine and carries out tension test by collet, to obtain the stress-strain of the test specimen
Curve graph.
4. the crack initiation life testing machine according to claim 3 for elastic material, which is characterized in that
The clamping device uses multistation clamping, and primary experiment being capable of the multiple test specimens of clamping.
5. the crack initiation life testing machine according to claim 1 for elastic material, which is characterized in that
The optical measuring device further includes lighting source, is used for photographic device supplement light when shooting the state picture
According to,
The photographic device is CCD camera,
In the fatigue test, the lighting source and the CCD camera are arranged before the test specimen；
The elastic material includes rubber material.
6. a kind of using the crack initiation life testing machine according to any one of claims 1-5 for elastic material
Method, the method includes the following steps：
(1) along the width direction of the test specimen, two mark lines is set on the surface of the test specimen and are surveyed
Measure the distance between two described mark lines；
(2) test specimen is stretched to by maximum position by the cupping machine, and passes through the strain measurement module
The elongation strain data obtained are saved in the memory module by the elongation strain for obtaining the test specimen at this time later
In；
(3) start the fatigue tester and start to load, while the fatigue numeration module start recording pulsating cyclic being made to answer
The load number of power；
(4) it after the load number for pre-setting scheduled pulsating stress cycle in the control and human-computer interaction module, opens
The crack monitoring module is moved, while the photographic device is controlled with human-computer interaction module by the control, makes the camera shooting
Device captures the state picture of the test specimen according to certain frequency, and the state picture of candid photograph is stored to described
In image buffer storage and processing module；
(5) the crack monitoring module carries out Identification of Cracks to described image caching with the state picture in processing module,
When recognizing the crackle more than the threshold value of setting, stop the monitoring to the test specimen, and pulsating cyclic at this time is answered
The load number of power and the state picture of corresponding crack initiation are saved in the memory module；
(6) continue to be monitored other test specimens, until all test specimen total Tests finish.
7. the method according to claim 6 using the crack initiation life testing machine for elastic material, feature exists
In,
During the fatigue test, the strain measurement module caches and processing module and the storage from described image
Extraction section test data in module, the elongation to calculate the test specimen described in the pilot process of fatigue test convert feelings
Condition；
After step (5) or (6), further include it is by fluctuating circulating stress to being loaded and fluctuating circulating stress cycle plus
It carries number and carries out data processing to obtain pulsating cyclic fatigue life, and convert the pulsating cyclic fatigue life to and symmetrically follow
Ring fatigue life.
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