CN107589001A - A kind of material impact experimental method - Google Patents
A kind of material impact experimental method Download PDFInfo
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- CN107589001A CN107589001A CN201710803743.6A CN201710803743A CN107589001A CN 107589001 A CN107589001 A CN 107589001A CN 201710803743 A CN201710803743 A CN 201710803743A CN 107589001 A CN107589001 A CN 107589001A
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Abstract
The present invention relates to a kind of material impact experimental method, this material impact experimental method, which is related to, is impacted to material to obtain the research of good performance etc., in order to solve the existing indirect sex chromosome mosaicism that plastic zone is analyzed using finite element method, the present invention devises a kind of material impact experimental method, it is exactly to imitate one piece of overall sample with two pieces of semicircle samples are stitched together, two pieces of semicircle samples are made tightly to be against together with sufficiently large power during experiment, it is not in instantaneous opening or the situation of the changing of the relative positions that this, which pushes against two pieces of semicircle samples during confirmation of trying hard to keep is tested and supports joint close gap, then, shock treatment is carried out at joint close gap in two pieces of supporting for semicircle sample, then remove and push against power separately sample, at this moment, the plastic zone upspring just is able to observe that on former abutting face.
Description
Technical field
The present invention relates to a kind of material impact experimental method.This material impact experimental method is related to impacts to material
To obtain the research of good performance etc..
Technical background
The technology that deformation process is carried out to material surface is widely used already, forms including bead, rolling
Several classes such as processing and hammer peening, achieve good effect in practice.
Its principle of existing several method is all by making material surface that partial mold deformation sequentially occur, finally making material
Material surface generates the compressive pre-stress layer of expected design, so as to substantially increase the static strength of part and fatigue strength.
After US3661655A describes a kind of progress dynamic load to flexible member, peening immediately is frozen spring
At least one surface, so that its surface produces residual compressive stress.
With the development of production, the performance more and more higher of material is on the one hand required, on the other hand requires the cost of material again
More and more lower, the research and development for relying solely on new material are obviously difficult to meet the needs of this conflicting, and surface is carried out at deformation
The technology of reason can significantly improve material property, it is thus possible to preferably solve this on the premise of less increase material cost
One contradiction.
The methods of bead, rolling processing and shock treatment, is each advantageous, and respectively has limitation, in order to deepen to recognize,
Research to the microcosmic mechanism of surface deformation of material, it is clear that it is extremely urgent, wherein just including the lower material internal modeling of external power effect
The research in property deformation area (hereinafter referred to as plastic zone).
It is to cause impression or percussion mark on overall sample first that one kind, which is contemplated, then attached at the center of impression or percussion mark
Sample is closely cut vertically downward, then, observational study is carried out to the plastic zone for cutting face, but due to cutting sample vertically downward
During stress sustained release so that the plastic zone vestige instantaneously upspring is cut open processing and erased completely, can not be seen after incision
Observe the vestige of plastic zone.
It is to the method for experiment use at present：Shock point is preset in material surface, with being glued in shock point different distance
Several strain transducers are pasted, the means such as data combination finite element analysis gathered using strain transducer in impact experiment, analysis
The scope and spatial form of plastic zone.
This method advantage is that the stress state of data extraction procedure plastic zone is interference-free.
Shortcoming is that acquired strain data is surface data, and the change of plastic zone occurs in the inside of material, plasticity
The situation in area can only be obtained indirectly by the method for finite element analysis, and this method needs to set a series of boundary condition, these
The basis of design of boundary condition is often and insufficient, causes finally to analyze obtained plastic zone and not fully meets truth,
It is limited to the directive significance of actual research and production.
Yu Zhefu etc. exists《The method of impact indentation measurement remnant stress》In one text modeling is analyzed using limited element analysis technique
The pattern in property area.
Chen Jun exists《Structural metallic materials mechanical property ball pressure evaluation method under big depth ratio》In one text using ball-pressure method and
Limited element analysis technique analyzes the pattern of plastic zone.
The content of the invention
In order to solve the existing indirect sex chromosome mosaicism that plastic zone is analyzed using finite element method, inventor devises one
Kind material impact experimental method, can obtain plastic zone scope directly perceived and vivid and shape information.
This method is exactly to imitate one piece of overall sample with two pieces of semicircle samples are stitched together, makes two and half during experiment
Circular specimen is tightly against together with sufficiently large power, and this pushes against two pieces of semicircle samples during confirmation of trying hard to keep is tested and supports joint close
Gap is not in instantaneous opening or the situation of the changing of the relative positions, then, shock treatment is carried out at joint close gap in two pieces of supporting for semicircle sample,
Then remove and push against power separately sample, at this moment, the plastic zone upspring just is able to observe that on former abutting face.
Specific practice is as follows：
Sample to be tested material is processed into two pieces first, has a face to carry out planar accurate grinding processing on each piece, to reach
Flatness and finish as high as possible.
Secondly, two dowel holes, a screwed hole and a shoulder hole are processed respectively on every piece of sample, it is ensured that two
The two bright and clean coplanar flats and relative engagement of block sample.
Two pieces of samples are connected to become two pieces of sample combinations with two alignment pins, two screws.
Two pieces of sample combinations are added external cylindrical surface and two end faces through being once loaded on lathe, and ensured in cylinder
Heart line is on two pieces of sample faying faces.
Machine two pieces of sample combinations are placed in open wedge set, utilize phase interworking on tightening sleeve, clamping sleeve
The screw thread of conjunction, screws clamping sleeve, so that between wedge-shaped sleeve wedging tightening sleeve and two pieces of sample combinations, combines system robust
For an entirety.
Drift is imported from the centre bore of clamping sleeve, and drift is loaded according to desin speed, drift combines to two pieces of samples
The center of body is impacted, and brings impact to be plastically deformed to two pieces of sample combinations.
Two pieces of sample combinations are opened, the plastic extruding deformation area on every piece of sample upsprings because external force cancels, area of upspringing
Comprising information provide material impact deformation plastic zone research new way.
Brief description of the drawings
Accompanying drawing 1 is a kind of implementation process schematic diagram of material impact deformation plastic zone research method：1 is to put on drift
Pressure direction；2 be drift；3 be the pin-guide hole on clamping sleeve；4 be clamping sleeve；5 be tightening sleeve；6 be open wedge set；7 are
Right sample block；8 be left sample block；9 be the support force direction of supports right sample block and left sample agllutination zoarium.
Accompanying drawing 2 is the combination schematic diagram of right sample block 7 and left sample block 8：10 be on right sample block and left sample agllutination zoarium in pair
Two screws of linea angulata arrangement；11 be in two alignment pins of diagonal arrangement on right sample block and left sample agllutination zoarium.
Accompanying drawing 3 is to open two pieces of sample combinations, and the impact plastically deforming area on every piece of sample is upspring because external force cancels
Schematic diagram：12 plastic zone to be upspring after two pieces of sample combinations of opening in ellipse circle.
Embodiment
Right sample block 7 and left sample block 8 are pushed against with two screws 10 and two alignment pins 11 and are combined into two pieces of sample combinations.
Two pieces of sample combinations are placed in open wedge set 6, using the screw thread to be cooperated on tightening sleeve 5 and clamping sleeve 4,
Clamping sleeve 4 is screwed, so that between the wedging tightening sleeve 5 of open wedge set 6 and two pieces of sample combinations, is combined into system robust
One entirety, such structure can prevent that the abutting face of right sample block 7 and left sample block 8 occurs to open and the changing of the relative positions in experimentation
Situation.
In the effect of the support force 9 of supports right sample block 7 and the combination of left sample block 8 and the pressure 1 put on drift 2
Under, the drift 2 in pin-guide hole 3 is impacted among right sample block 7 and left sample block 8, causes the part among right sample block 7 and left sample block 8
There occurs plastic deformation, because generation is plastic extruding deformation, the combination of right sample block 7 and left sample block 8 within the specific limits
Support joint close will not open.
Then remove the abutting power between right sample block 7 and left sample block 8, open two pieces of sample combinations, squeezing on every piece of sample
Compactibility deformation area upsprings because external force cancels, the plastic zone 12 upspring.
The plastic zone vestige 12 upspring is measured using means such as laser co-focusing microscopic analyses, analyzed, it becomes possible to
The information such as plastic zone scope, area and bounce amount are obtained, can analyze impact deformation according to these information should to material internal
The influence of field of force change.
Claims (3)
1. a kind of material impact experimental method it is characterized in that：One piece of overall examination is imitated with two pieces of semicircle samples are stitched together
Sample, two pieces of semicircle samples is tightly against together with sufficiently large power during experiment, then, closed in two pieces of supporting for semicircle sample
Shock treatment is carried out at gap, then removes and pushes against power separately sample, at this moment, be just able to observe that what is upspring on former abutting face
Plastic zone, in the support force (9) of right sample block (7) and the combination of left sample block (8) and the pressure (1) that puts on drift (2)
Under effect, the drift (2) in pin-guide hole (3) is impacted among right sample block (7) and left sample block (8), causes right sample block (7) and left sample block
(8) part among removes the abutting power between right sample block (7) and left sample block (8) within the specific limits there occurs plastic deformation,
Two pieces of sample combinations are opened, the extruding plastic deformation area on every piece of sample upsprings because external force cancels, the plasticity upspring
Area (12).
2. a kind of material impact experimental method as described in claim 1 it is characterized in that：Positioned with two screws (10) and two
Pin (11) pushes against right sample block (7) and left sample block (8) and is combined into two pieces of sample combinations, and two pieces of sample combinations are placed in opening wedge
In shape set (6), using the screw thread to be cooperated on tightening sleeve (5) and clamping sleeve (4), clamping sleeve (4) is screwed, so that opening wedge
Between shape set (6) wedging tightening sleeve (5) and two pieces of sample combinations, it is integrated into a whole system robust, such structure
It can prevent that the face that pushes against of right sample block (7) and left sample block (8) occurs to open the situation with the changing of the relative positions in experimentation.
3. a kind of material impact experimental method as described in claim 1 it is characterized in that：Utilize laser co-focusing microscopic analysis etc.
Means are measured to the plastic zone vestige (12) upspring, analyzed, it becomes possible to obtain plastic zone scope, area and bounce amount etc.
Information, influence of the impact deformation to material internal change of stress field can be analyzed according to these information.
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| CN201710803743.6A CN107589001B (en) | 2017-09-08 | 2017-09-08 | Material impact experiment method |
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| CN201710803743.6A CN107589001B (en) | 2017-09-08 | 2017-09-08 | Material impact experiment method |
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| CN107589001B CN107589001B (en) | 2020-12-29 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109269920A (en) * | 2018-08-02 | 2019-01-25 | 北矿科技股份有限公司 | It is a kind of for measuring the test device of multi-pole magnet-ring toughness |
| CN109459290A (en) * | 2018-12-25 | 2019-03-12 | 重庆交通大学 | A kind of NSCB sample preparation device and its application method for testing compacted cohesive soil I type fracture toughness |
| CN110031342A (en) * | 2019-05-29 | 2019-07-19 | 吉林大学 | A kind of material breakdown experimental method |
| CN110031341A (en) * | 2019-05-29 | 2019-07-19 | 吉林大学 | A kind of material impact experimental method |
| CN112577984A (en) * | 2020-11-09 | 2021-03-30 | 中国科学院金属研究所 | Preparation method of block sample for observing deformation behavior of zirconium alloy |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109269920A (en) * | 2018-08-02 | 2019-01-25 | 北矿科技股份有限公司 | It is a kind of for measuring the test device of multi-pole magnet-ring toughness |
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| CN109459290A (en) * | 2018-12-25 | 2019-03-12 | 重庆交通大学 | A kind of NSCB sample preparation device and its application method for testing compacted cohesive soil I type fracture toughness |
| CN110031342A (en) * | 2019-05-29 | 2019-07-19 | 吉林大学 | A kind of material breakdown experimental method |
| CN110031341A (en) * | 2019-05-29 | 2019-07-19 | 吉林大学 | A kind of material impact experimental method |
| CN112577984A (en) * | 2020-11-09 | 2021-03-30 | 中国科学院金属研究所 | Preparation method of block sample for observing deformation behavior of zirconium alloy |
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