CN202171553U - Sample for testing performance parameters of pipes in complicated stress states - Google Patents
Sample for testing performance parameters of pipes in complicated stress states Download PDFInfo
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- CN202171553U CN202171553U CN2011202649051U CN201120264905U CN202171553U CN 202171553 U CN202171553 U CN 202171553U CN 2011202649051 U CN2011202649051 U CN 2011202649051U CN 201120264905 U CN201120264905 U CN 201120264905U CN 202171553 U CN202171553 U CN 202171553U
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- elliptical aperture
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- elliptical hole
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Abstract
The utility model provides a sample for testing the performance parameters of pipes in complicated stress states and a test method. In the prior art, an elliptical through hole is formed on a frequently-used one-way stretching arc-shaped sample to form an arc-shaped stretching sample with an elliptical hole, the macroaxis of the elliptical hole on the arc-shaped stretching sample is 2.5-5mm, and the minor axis is 1.5-3mm; the center line of the macroaxis of the elliptical hole is superposed with that of the arc-shaped stretching sample with the elliptical hole in the length direction; and the center of the elliptical hole is superposed with the centroid of the arc-shaped stretching sample with the elliptical hole. The sample is subject to a stretching test to obtain strength-displacement data, so that the accuracy and efficiency in testing the performance parameters of the pipes are improved.
Description
Technical field
The present invention relates to a kind of sample that is used for mechanical properties of tubular goods parameter under the testing complex stress state in the tube plastic forming technical field.
Background technology
The tubing member has obtained increasingly extensive attention and application owing to can satisfy an urgent demand to aspects such as product lightweight, Strengthening and Toughening in high-tech sectors such as automobile, aerospaces.Tubing is in forming processes such as hydraulic expanding-forming and numerical control bending; Its plastic flow and deformational behavior are very complicated; The complex stress that tubing receives two-way drawing/press loads; And in order to formulate reasonable technological and to realize the accurate values modeling analysis, pressing for acquisition can reflect accurately that tubing is two-way and draw/material property parameter under the compressive stress state.
Traditional piping material unilateral stretching sample is according to State Standard of the People's Republic of China's " metal material tensile test at room temperature method " GB/T228-2002 design, and the sample two ends are retained parts, and the distorted area of test is in the middle part.
The hoop tensile sample is that intercepted length is the annulus of 1～50mm from the tubing; To have the inwall that first semi-round bar and second semi-round bar with ring specimen internal diameter same diameter pass ring specimen then; The two ends of first semi-round bar link to each other with the last anchor clamps of material stretch test machine through second connector; The two ends of second semi-round bar link to each other with the lower clamp of material stretch test machine through second connector; Stretching makes ring specimen generation stretcher strain obtain the Erichsen test data, and in process of the test, there are the accuracy of frictional influence data in annular sample and semi-round bar; And need measure the different test mould of Design and Machining to different size tubing, its testing cost is higher.
The outline of cross tensile sample is octagon, is symmetrical set two circular holes at the two ends than long central axis of sample, is used to load the anchor clamps of cupping machine; Be symmetrical set four holes that seamlessly transit in the central area of sample, make the centre of sample present the right-angled intersection shape, two surfaces up and down at right-angled intersection position, sample central area are through the polishing attenuation; Its test method also is to stretch through common cupping machine to obtain ess-strain; Because the right-angled intersection position is thin and yielding, receives the plane stress strain regime, can obtain the plane plasticity response; The right-angled intersection sample needs special shape design and processing; Its cost of manufacture is high, and the deflection of cross part is difficult to confirm that the result is accurate inadequately in output in the process of the test.
The sample of hydraulic expanding-forming is one section pipe with certain-length; Its supercharging device comprises shaping die, end mould, vane pump and pipeline up and down; Its mould and equipment are comparatively special; Defective such as have that mould structure is complicated, testing cost is high, test performance difficulty and material parameter are difficult to confirm, and can only obtain the thick anisotropy index of minor caliber pipe.
The folk prescription that the material parameter that common atresia arc sample extension test obtains only shows the specimen length direction is to the tension strain; The complicacy that can't obtain meeting in the moulding process of tubing is drawn/compressive stress; The unreasonable analog result that makes is inaccurate owing to the original material parameter is provided with to cause follow-up bending pipes finite element analogy; Can't objectively respond tubing actual flexion process, and have restrictions such as sample design and processed complex, testing cost height and test result be inaccurate.
Summary of the invention
Can not accurately obtain the performance parameter of tubing under complex stress condition in order to overcome the sample that exists in the prior art comprehensively; Thereby influence the problem of design of tubing plastic forming process and forming process analysis of finite element by numerical simulation precision, the present invention proposes a kind of sample that is used for pipe performance parameter under the testing complex stress state.
The present invention is processed with ellipse hole on the unilateral stretching arc sample of using always in the prior art, forms band elliptical aperture arc tensile sample; The major axis of the elliptical aperture on the described band elliptical aperture arc tensile sample is 2.5～5mm, and minor axis is 1.5～3mm; The center line of the elliptical aperture major axis on the described band elliptical aperture arc tensile sample and the central lines of being with elliptical aperture arc tensile sample length direction; The center of circle of said elliptical aperture overlaps with the centre of form of band elliptical aperture arc tensile sample.The roughness of elliptical aperture inwall is 0.8～0.2.
The present invention beats elliptical aperture in the heart at the row of common atresia arc sample, forces sample stress in drawing process to be concentrated and produces the plane stress strain; Tubing compression sample is direct one section pipeline section of intercepting from the tubing, and the compression through axial or side direction produces complicated compression stress strain.The test of band elliptical aperture arc sample loads through unilateral stretching; Can induce the elliptical aperture skirt materials and produce the plane stress strain; The major axis of elliptical aperture and the dead in line of sample simultaneously; Have bigger range of strain compared with circular hole, resulting material parameter meets the suffered plane stress strain attribute in the bending pipes outside in the moulding process of tubing more.The compression sample testing loads through axial or lateral compression; The axial compression test of tubing compression sample is through sample is carried out the simple physics axial compression; Force tubular product sample to produce the compression unstability; Can produce fold after the sample compression unstability, progressively compression-loaded bending pipes inboard unstability in the process of unstability and the tube plastic forming is wrinkling similar by initial compression zero condition for this; The lateral compression test of tubing compression sample is to flatten through sample being carried out the simple physics side direction; Tubing compression sample lateral compression test plastic yield the best part concentrates on the center section of the lateral compression direction of tubular product sample; In plastic history; This a part of neutral line outside receives tension, the inboard compression chord of neutral line, and the place, summit receives two-way tension.
Utilize the present invention to induce different stress-strain states, meet the complex stress in the moulding process of tubing more, further improve the accurate and efficient of pipe performance parameter testing through the physical test loading of simply drawing/press of common cupping machine.
Description of drawings
Fig. 1 is the side view of the structural representation of band elliptical aperture arc tensile sample.
Fig. 2 is the front view of the structural representation of band elliptical aperture arc tensile sample.Wherein:
1. unilateral stretching arc sample 2. elliptical apertures
Embodiment
Present embodiment is after unilateral stretching arc sample commonly used in the prior art is improved, the sample that is used for pipe performance parameter under the testing complex stress state that obtains.
The caliber D of tubing that present embodiment is tested is 30mm.Be processed with an ellipse hole on the used unilateral stretching arc sample, and the major axis of said ellipse hole is 2.5mm, minor axis is 1.5mm.The parallel axes of long axis of ellipse 5 and sample.The center of circle of said elliptical aperture overlaps with the centre of form of band elliptical aperture arc tensile sample.The roughness of elliptical aperture inwall is 0.8.
Present embodiment is after unilateral stretching arc sample commonly used in the prior art is improved, the sample that is used for pipe performance parameter under the testing complex stress state that obtains.
The caliber D of tubing that present embodiment is tested is 200mm.Be processed with an ellipse hole on the used unilateral stretching sample, and the major axis of said ellipse hole is 5mm, minor axis is 3mm.The parallel axes of long axis of ellipse 5 and sample.The center of circle of said elliptical aperture overlaps with the centre of form of band elliptical aperture arc tensile sample.The roughness of elliptical aperture inwall is 0.2.
Embodiment 3
Present embodiment is after unilateral stretching arc sample commonly used in the prior art is improved, the sample that is used for pipe performance parameter under the testing complex stress state that obtains.
The caliber D of tubing that present embodiment is tested is 100mm.Be processed with an ellipse hole on the used unilateral stretching sample, and the major axis of said ellipse hole is 4mm, minor axis is 2mm.The parallel axes of long axis of ellipse and sample.The center of circle of said elliptical aperture overlaps with the centre of form of band elliptical aperture arc tensile sample.The roughness of elliptical aperture inwall is 0.4.
Claims (1)
1. a sample that is used for pipe performance parameter under the testing complex stress state is characterized in that, is processed with ellipse hole on the unilateral stretching arc sample commonly used in the prior art, forms band elliptical aperture arc tensile sample; The major axis of the elliptical aperture on the described band elliptical aperture arc tensile sample is 2.5～5mm, and minor axis is 1.5～3mm; The center line of the elliptical aperture major axis on the described band elliptical aperture arc tensile sample and the central lines of being with elliptical aperture arc tensile sample length direction; The center of circle of said elliptical aperture overlaps with the centre of form of band elliptical aperture arc tensile sample, and the roughness of elliptical aperture inwall is 0.8～0.2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202649051U CN202171553U (en) | 2011-07-25 | 2011-07-25 | Sample for testing performance parameters of pipes in complicated stress states |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202649051U CN202171553U (en) | 2011-07-25 | 2011-07-25 | Sample for testing performance parameters of pipes in complicated stress states |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202171553U true CN202171553U (en) | 2012-03-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011202649051U Expired - Fee Related CN202171553U (en) | 2011-07-25 | 2011-07-25 | Sample for testing performance parameters of pipes in complicated stress states |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102410957A (en) * | 2011-07-25 | 2012-04-11 | 西北工业大学 | Test sample and method for testing performance parameters of pipe under complex stress state |
| CN107478475A (en) * | 2017-07-25 | 2017-12-15 | 东北大学 | A kind of design method for characterizing the simple tension sample for rolling poor thick plate mechanics behavior |
| RU2792195C1 (en) * | 2022-08-19 | 2023-03-20 | Федеральное автономное учреждение "Центральный аэрогидродинамический институт имени профессора Н.Е. Жуковского" (ФАУ "ЦАГИ") | Method for determining the effect of preliminary plastic deformation on the fatigue resistance of the material |
-
2011
- 2011-07-25 CN CN2011202649051U patent/CN202171553U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102410957A (en) * | 2011-07-25 | 2012-04-11 | 西北工业大学 | Test sample and method for testing performance parameters of pipe under complex stress state |
| CN102410957B (en) * | 2011-07-25 | 2014-04-02 | 西北工业大学 | Test sample and method for testing performance parameters of pipe under complex stress state |
| CN107478475A (en) * | 2017-07-25 | 2017-12-15 | 东北大学 | A kind of design method for characterizing the simple tension sample for rolling poor thick plate mechanics behavior |
| CN107478475B (en) * | 2017-07-25 | 2019-11-08 | 东北大学 | A kind of design method of the simple tension sample of the poor thick plate mechanics behavior of characterization rolling |
| RU2792195C1 (en) * | 2022-08-19 | 2023-03-20 | Федеральное автономное учреждение "Центральный аэрогидродинамический институт имени профессора Н.Е. Жуковского" (ФАУ "ЦАГИ") | Method for determining the effect of preliminary plastic deformation on the fatigue resistance of the material |
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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 |
Granted publication date: 20120321 Termination date: 20140725 |
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| EXPY | Termination of patent right or utility model |