CN102937414A - Dynamic and static strain testing method - Google Patents
Dynamic and static strain testing method Download PDFInfo
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- CN102937414A CN102937414A CN2012104369533A CN201210436953A CN102937414A CN 102937414 A CN102937414 A CN 102937414A CN 2012104369533 A CN2012104369533 A CN 2012104369533A CN 201210436953 A CN201210436953 A CN 201210436953A CN 102937414 A CN102937414 A CN 102937414A
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Abstract
The invention discloses a dynamic and static strain testing method. The dynamic and static strain testing method adopts the light transmission measuring technology, two parallel rigid guide pins are fixed on two sides of a sample testing section, the rigid guide pins are perpendicular to the central axis of the drawing direction of the sample testing section, length of the rigid guide pins is larger than width of the sample testing section, initial distance between the two rigid guide pins, real-time distance in a drawing process and final distance after drawing are measured by adopting a light transmission type digital micrometer, real-time strain and final strain of the sample testing section are obtained through calculation, measuring positions of the micrometer are located on two sides of the sample testing section, and the measuring positions are equal to the distance of the central axis in the drawing direction of the sample testing section. Distance variation of the rigid guide pins in the drawing process is measured through the light transmission measuring technology, the dynamic and static strain testing method achieves rapid and convenient measurement of strain of a small test area material, a soft material and a large deformation condition, overcomes defects of an existing measuring method, and makes up a dead zone of application of an existing method.
Description
Technical field
The invention belongs to the strain measurement method in the mechanical field, relate in particular to a kind of sound attitude strain testing method based on light transmitting measurement technology.
Background technology
Strain measurement method in the mechanical field mainly contains the resistance-strain method at present, uses the mechanical electronic extensometer, and adopts holographic interferometry technique etc.But these methods of electricity all are not suitable for being applied in the quick and convenient measurement of small test area material, flexible material and the strain of large deformation situation.
Summary of the invention
The object of the present invention is to provide a kind of sound attitude strain testing method.
The technical scheme that realizes above-mentioned purpose is: a kind of sound attitude strain testing method may further comprise the steps:
Step 1, fix two rigidity that are parallel to each other in specimen test section both sides and draw pin, it is vertical with the central axis of specimen test section draw direction that rigidity is drawn pin, and rigidity is drawn pin length greater than the width of specimen test section;
Step 2, adopt the saturating formula digital micrometer of light measure two rigidity draw between pin apart from Sl and Sr, with the mean distance S=(Sl+Sr)/2 of Sl and the Sr initial length S as the specimen test section, wherein the measuring position of Sl and Sr is positioned at specimen test section both sides, and equates with the distance of specimen test section draw direction central axis;
Step 3, tensile sample, adopt the saturating formula digital micrometer of light measure in real time two rigidity draw between pin apart from S ' l and S ' r, the measuring position is identical with measuring position in the step 2, with the mean distance S ' of S ' l and S ' r=(S ' l+S ' r)/2 is as the length S ' of specimen test section, by formula ε '=(S-S ')/S obtain in real time the strain stress of specimen test section ';
Step 4, when reaching the tensile force of setting, stop tensile sample, adopt the saturating formula digital micrometer of light measure two rigidity draw between pin apart from S " t and S " r, the measuring position is identical with measuring position in the step 2, with the mean distance S of S " l and S " r "=(S " l+S " r)/the 2 final lengths S as the specimen test section ", and by formula ε "=(S-S ")/S obtain the final strain stress of specimen test section ".
The present invention has realized the quick and convenient measurement to small test area material, flexible material and the strain of large deformation situation, has overcome the defective of existing measuring method, has remedied preferably the blind area that existing method is used.
Embodiment
The preferred embodiments of the present invention are described below.
In the present embodiment, adopt above-mentioned strain gauge means that rectangle pure copper samples and dog bone shape pure copper samples have been carried out strain measurement, the model of the saturating formula digital micrometer 2 of use therein light is the LS-7010 that KEYENCE company produces, the rectangle pure copper samples is of a size of 16 * 1 * 9 (mm), and dog bone shape pure copper samples semipilot section section is of a size of 6 * 1 * 6 (mm).
At first, adopt soldering method to fix two rigidity that are parallel to each other in the test section both sides of rectangle pure copper samples and dog bone shape pure copper samples and draw pin 4, it is vertical with the central axis of specimen test section draw direction that rigidity is drawn pin, and rigidity is drawn the length of pin 4 greater than the width of specimen test section; The rigidity of using is drawn pin 4 and is drawn pin as the column type of even thickness, and hardness reaches 45HRC.
Secondly, the style 3 that is fixed with rigidity and draws pin 4 is installed on the testing machine, and specimen test section central axis with middle slot 8 is alignd, guarantee that the measuring position of two saturating formula digital micrometers 2 of light is equal apart from the distance of specimen test section central axis.Adopt the saturating formula digital micrometer 2 of light measure two rigidity draw between pin apart from Sl and Sr, Sl is the distance that measure measuring position, specimen test section left side, Sr is the distance that measure measuring position, specimen test section right side, with the mean distance S=(Sl+Sr)/2 of Sl and the Sr initial length S as the specimen test section.
Next, the starting characteristics test machine, tensile sample, adopt the saturating formula digital micrometer 2 of light measure in real time two rigidity draw 4 on pin apart from S ' l and S ' r, with the mean distance S ' of S ' l and S ' r=(S ' l+S ' r)/2 is as the length S ' of specimen test section, by formula ε '=(S-S ')/S obtain in real time the strain stress of specimen test section '.And the style strain value that will obtain in real time combines with the stress value that drawing machine provides, and draws out stress-strain diagram.
At last, when testing machine reaches the tensile force of setting, stop tensile sample, adopt the saturating formula digital micrometer 2 of light measure two rigidity draw 4 on pin apart from S " l and S " r, with the mean distance S of S " l and S " r "=(S " l+S " r)/the 2 final lengths S as the specimen test section ", and by formula ε "=(S-S ")/S obtain the final strain stress of specimen test section ".
Wherein, at the initial length S that obtains the specimen test section and the final lengths S of specimen test section " time; adopted following disposal route: under static force; make and use up formula digital micrometer 2 and carry out data acquisition with 2400 times/second frequency; continuous collecting data 10 seconds; thus the working majority certificate obtained, and to gather 24000 data that obtained altogether Sl in 10 seconds be χ 1～χ 24000 to measure Sl as example, to establish.
Principle of the present invention is: by the strain variation amount of light transmitting measurement technology amplified material, draw the change of distance of pin in drawing process by measuring rigidity, reach the measurement to small test area material, flexible material and large deformation situation dependent variable.
Below in conjunction with the embodiments the present invention is had been described in detail, those skilled in the art can make the many variations example to the present invention according to the above description.Thereby some details among the embodiment should not consist of limitation of the invention, and the scope that the present invention will define with appended claims is as protection scope of the present invention.
Claims (1)
1. a sound attitude strain testing method is characterized in that, may further comprise the steps:
Step 1, fix two rigidity that are parallel to each other in specimen test section both sides and draw pin, it is vertical with the central axis of specimen test section draw direction that rigidity is drawn pin, and rigidity is drawn pin length greater than the width of specimen test section;
Step 2, adopt the saturating formula digital micrometer of light measure two rigidity draw between pin apart from Sl and Sr, with the mean distance S=(Sl+Sr)/2 of Sl and the Sr initial length S as the specimen test section, wherein the measuring position of Sl and Sr is positioned at specimen test section both sides, and equates with the distance of specimen test section draw direction central axis;
Step 3, tensile sample, adopt the saturating formula digital micrometer of light measure in real time two rigidity draw between pin apart from S ' l and S ' r, the measuring position is identical with measuring position in the step 2, with the mean distance S ' of S ' l and S ' r=(S ' l+S ' r)/2 is as the length S ' of specimen test section, by formula ε '=(S-S ')/S obtain in real time the strain stress of specimen test section ';
Step 4, when reaching the tensile force of setting, stop tensile sample, adopt the saturating formula digital micrometer of light measure two rigidity draw between pin apart from S " l and S " r, the measuring position is identical with measuring position in the step 2, with the mean distance S of S " l and S " r "=(S " l+S " r)/the 2 final lengths S as the specimen test section ", and by formula ε "=(S-S ")/S obtain the final strain stress of specimen test section ".
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104369533A CN102937414A (en) | 2012-11-06 | 2012-11-06 | Dynamic and static strain testing method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012104369533A CN102937414A (en) | 2012-11-06 | 2012-11-06 | Dynamic and static strain testing method |
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| CN102937414A true CN102937414A (en) | 2013-02-20 |
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| CN2012104369533A Pending CN102937414A (en) | 2012-11-06 | 2012-11-06 | Dynamic and static strain testing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109737884A (en) * | 2019-01-23 | 2019-05-10 | 合肥工业大学 | A kind of quiet dynamic deformation amount on-Line Monitor Device of axial workpiece and method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11223513A (en) * | 1998-02-09 | 1999-08-17 | Hitachi Zosen Corp | Strain measuring device |
| CN101975555A (en) * | 2010-09-25 | 2011-02-16 | 西北工业大学 | Strain measurement method based on light transmission measuring technology and device thereof |
| CN201811721U (en) * | 2010-09-25 | 2011-04-27 | 西北工业大学 | Stress measurement device based on light transmitting measurement technology |
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2012
- 2012-11-06 CN CN2012104369533A patent/CN102937414A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11223513A (en) * | 1998-02-09 | 1999-08-17 | Hitachi Zosen Corp | Strain measuring device |
| CN101975555A (en) * | 2010-09-25 | 2011-02-16 | 西北工业大学 | Strain measurement method based on light transmission measuring technology and device thereof |
| CN201811721U (en) * | 2010-09-25 | 2011-04-27 | 西北工业大学 | Stress measurement device based on light transmitting measurement technology |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109737884A (en) * | 2019-01-23 | 2019-05-10 | 合肥工业大学 | A kind of quiet dynamic deformation amount on-Line Monitor Device of axial workpiece and method |
| CN109737884B (en) * | 2019-01-23 | 2020-05-05 | 合肥工业大学 | On-line monitoring device and method for static and dynamic deformation quantity of shaft part |
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Application publication date: 20130220 |