CN202814607U - Test device for residual stress of a metal material - Google Patents
Test device for residual stress of a metal material Download PDFInfo
- Publication number
- CN202814607U CN202814607U CN 201220426537 CN201220426537U CN202814607U CN 202814607 U CN202814607 U CN 202814607U CN 201220426537 CN201220426537 CN 201220426537 CN 201220426537 U CN201220426537 U CN 201220426537U CN 202814607 U CN202814607 U CN 202814607U
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- wire
- measuring instrument
- strain rosette
- connection terminal
- metal material
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
A test device for residual stress of a metal material is composed of a measuring instrument, a conduction wire connected with the measuring instrument, a strain rosette, and a lead wire connected with the strain rosette, wherein a wire connection port is arranged on a wire connection terminal, the conduction wire connected with the measuring instrument and the lead wire connected with the strain rosette are correspondingly connected with the outer, inner ends of the wire connection port on the wire connection terminal; and a copper foil layer is arranged on the wire connection port. The lead wire of the strain rosette is reliably, conveniently and quickly connected with the conduction wire of the measuring instrument, the test efficiency is high, the test specification is strong, the structure is simple, the short circuit phenomenon caused by improper wire connection is eliminated and moreover the test device can be repeatedly used.
Description
Technical field
The utility model relates to a kind of Metal Mechanic Property test unit, specifically belongs to a kind of test unit of metal material unrelieved stress.
Background technology
Residual stress problems receives people's concern always.In casting, forging, welding and all kinds of cutting process, workpiece all can be owing to the effect that is subjected to external force and temperature causes unrelieved stress.The generation of unrelieved stress, stack and dispose procedure cause the redistribution of inside parts stress state, just may affect the size of part and the assembly precision of the accuracy of form and position and parts, reduce the ability of fatigue strength, stress corrosion resistant and the creep resistant cracking of part, finally have influence on performance and the serviceable life of machinery and equipment.Therefore, analyze unrelieved stress mechanism of production, probe into effective residual stress test method and improve that unrelieved stress situation tool has very great significance in the part.
The measuring method of unrelieved stress can be divided into nondestructive measurement method and mechanical two kinds of the mensurations that discharge at present.The nondestructive measurement method is physical measure, mainly contains x rays method, x ray diffraction method, neutron diffraction method, ultrasonic method and method of magnetic etc.It is that the parts that will have unrelieved stress separate from member or cut out and make stress relief that machinery discharges mensuration, obtain unrelieved stress by the variation of measuring its strain, the method can cause certain damage or destruction to workpiece, but its measuring accuracy is higher, theoretical perfect, technology maturation, is widely used.The various countries researcher continues machinery release mensuration has been done a large amount of research work in recent years, and the aspects such as the various technological parameters from practical operation, source of error conduct in-depth analysis, and it is gradually improved.They mainly comprise boring method (Blind Hole Method), ring core method, cut apart slitting method etc., and U.S. ASTM association has received Blind Hole Method people's standard.Blind Hole Method is exactly to bore a small through hole or blind hole at workpiece, make the stress of measured point obtain discharging, and record the dependent variable of release by the strain rosette that is attached in advance Kong Zhouwei, just can obtain average residual residue stress on the drill hole depth direction by converting according to principle of elasticity again.
Machinery commonly used discharges mensuration and all need to paste strain rosette on the surface of workpiece for measurement at present, then the special wire with the lead-in wire on the strain rosette and strain gauge adopts the soldering mode to be connected to together, thereby make strain rosette and measuring instrument form electric loop, be convenient to follow-up surveying work.
In above-mentioned steps, how the strain rosette lead-in wire being linked together reliably with the measuring instrument wire is a very important technical step.Must not there be rosin joint in tin welding spot between the two, and each soldering tie point must insulate fully with workpiece simultaneously, otherwise can form short circuit between measuring circuit and the workpiece, and follow-up test work can't be carried out.Strain rosette commonly used has a plurality of types such as unidirectional, two-way and three-dimensional at present, the lead-in wire of strain rosette does not wait from 2 to 12, need the radical of welding more, the time of cost is longer, generally be that plastic sheet of pad insulate below connecting portion, then adopt the soldering mode that both are coupled together.Because this connected mode is time-consuming, effort, labour intensity is large, badly influences work efficiency, and main is to guarantee welding quality and test findings.
The utility model content
The purpose of this utility model is to overcome above-mentioned deficiency, provide a kind of strain rosette lead-in wire to be connected reliable, convenient, fast, raising test efficiency with the measuring instrument wire, the test unit of the metal material unrelieved stress of short circuit phenomenon simple in structure, as to eliminate the improper generation of wiring.
Realize the technical measures of above-mentioned purpose:
The test unit of metal material unrelieved stress, by measuring instrument, the wire that is connected with measuring instrument, strain rosette, the lead-in wire that is connected with strain rosette forms, it is: establish connection jaws at connection terminal, the lead-in wire correspondence that the wire that measuring instrument connects and strain rosette connect is connected to the outer, inner of connection jaws on the connection terminal; Be provided with copper foil layer at connection jaws.
It is characterized in that: connection terminal be shaped as circular or hollow triangle or square hollow.Circular or the hollow triangle of preferential selection.
Characteristics of the present utility model are: strain rosette lead-in wire is connected reliable, convenient, fast with the measuring instrument wire, the test efficiency height, and test specification is strong, and simple in structure, can also eliminate the short circuit phenomenon energy of the improper generation of wiring and reuses.
Description of drawings
Fig. 1 is structural representation of the present utility model
Fig. 2 is the structural representation of Fig. 1 hollow core delta connection terminal
Fig. 3 is the structural representation of the square connection terminal of Fig. 1 hollow core.
Among the figure: 1-measuring instrument, 2-wire, 3-strain rosette, 4-lead-in wire, 5-connection terminal, 6-connection jaws, 7-copper foil layer.
Embodiment
Be described further below in conjunction with accompanying drawing:
The test unit of metal material unrelieved stress, by measuring instrument 1, the wire 2 that is connected with measuring instrument 1, strain rosette 3, the lead-in wire 4 that is connected with strain rosette 3 forms.Machining shape is circular or the connection terminal 5 of hollow triangle or square hollow, and at connection terminal 5 processing connection jaws 6, lead-in wire 4 correspondences that the wire 2 that measuring instrument 1 is connected and strain rosette 3 connect are connected to the outer, inner of connection jaws 6 that connection terminal 5 is provided with, form the loop; Be provided with copper foil layer 7 at connection jaws 6.
Before the stress test, first connection terminal 5 usefulness 502 are adhesive in the periphery of strain rosette 3, the lead-in wire 4 with strain rosette 3 inserts respectively the outer, inner of corresponding connection jaws 6 with the wire 2 of measuring instrument 1 again, forms the loop, begins to test.After off-test, take off connection terminal 5, in order to using next time.
Above-described embodiment only is for exemplifying that the utility model does clearly is described, is not whole.
Claims (2)
1. the test unit of metal material unrelieved stress, by measuring instrument, the wire that is connected with measuring instrument, strain rosette, the lead-in wire that is connected with strain rosette forms, it is characterized in that: establish connection jaws at connection terminal, the lead-in wire correspondence that the wire that measuring instrument connects and strain rosette connect is connected to the outer, inner of connection jaws on the connection terminal; Be provided with copper foil layer at connection jaws.
2. the test unit of metal material unrelieved stress as claimed in claim 1 is characterized in that: connection terminal be shaped as circular or hollow triangle or square hollow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220426537 CN202814607U (en) | 2012-08-27 | 2012-08-27 | Test device for residual stress of a metal material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220426537 CN202814607U (en) | 2012-08-27 | 2012-08-27 | Test device for residual stress of a metal material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202814607U true CN202814607U (en) | 2013-03-20 |
Family
ID=47873466
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220426537 Expired - Fee Related CN202814607U (en) | 2012-08-27 | 2012-08-27 | Test device for residual stress of a metal material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202814607U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107101762A (en) * | 2017-05-17 | 2017-08-29 | 北京工业大学 | A kind of measuring method of round tube inner wall welding residual stress |
-
2012
- 2012-08-27 CN CN 201220426537 patent/CN202814607U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107101762A (en) * | 2017-05-17 | 2017-08-29 | 北京工业大学 | A kind of measuring method of round tube inner wall welding residual stress |
| CN107101762B (en) * | 2017-05-17 | 2019-12-03 | 北京工业大学 | A kind of measurement method of round tube inner wall welding residual stress |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130320 Termination date: 20170827 |