CN104062107B - Static force/fatigue performance test method for single section of reinforced frame/beam - Google Patents
Static force/fatigue performance test method for single section of reinforced frame/beam Download PDFInfo
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- CN104062107B CN104062107B CN201410128725.9A CN201410128725A CN104062107B CN 104062107 B CN104062107 B CN 104062107B CN 201410128725 A CN201410128725 A CN 201410128725A CN 104062107 B CN104062107 B CN 104062107B
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Abstract
The invention belongs to the field of airplane design, and relates to a method suitable for testing typical sections of structures such as reinforced frames and beams. The method is characterized in that a four-point bent beam test piece capable of reflecting the single section characteristic of a reinforced frame/beam is designed to perform static force/fatigue test. The method has the advantages that the four-point bent beam test piece is taken as a structural test piece having typical reinforced frame/beam characteristics, the stress situation of the main section of the reinforced frame/beam is reflected, and test research is performed by using the stress situation, thereby remarkably reducing the scale of test, shortening the test period and reducing the research cost; the four-point bent beam test piece is particularly suitable for the test research of typical stress section of a reinforced frame/beam structure which does not have any centralized bearing joint and is mainly used for bearing bending load; comparison rest research of different materials or processes of the reinforced frame/beam can be performed conveniently; a simple four-point bent beam test fixture can be designed, four-point bent beam static force/fatigue test is performed on an ordinary tester, and test is simple and convenient.
Description
Technical field
The invention belongs to field of airplane design, it is related to one kind and is applied to reinforcing frame, the isostructural typical section of beam are carried out
The method of test.
Background technology
In airplane design technical field, for the static(al)/Fatigue Test Research of reinforcing frame, the isostructural typical section of beam,
Never suitable method, often with reference to reinforcing frame, the real structure of beam, the installation aboard of simulation reinforcing frame, beam, solid
Determine mode, tested using a large amount of jockeies, therefore testpieces quantity is many, the cycle manufacture, tested is long.
Content of the invention
The purpose of the present invention is: designs a kind of four_point bending beam examination of typical section feature that can reflect reinforcing frame, beam
Test part, by easy fixture, be arranged on testing machine, carry out static(al)/Fatigue Test Research.
The technical scheme is that a kind of reinforcing frame, beam single section static(al)/Test Method of Fatigue Behavior, its feature
It is, comprise the steps:
First, choose reinforcing frame, the section of beam needing research experiment；
Second, design a four_point bending beam, selection, manufacturing process are consistent with above-mentioned reinforcing frame, beam, with four-point bending
The intermediate cross-section of beam is axis of symmetry, the shape and size in section and above-mentioned reinforcing frame at axis of symmetry, the shape of beam section and
Consistent size, is arranged symmetrically 4 ribs vertical with upper and lower edge strip and web, respectively as the support of fixing point and load(ing) point,
The position intersected with lower edge strip in rib 1 and rib 4, one end fixation is hinged, and one end is movably hinged, forms simply supported beam, in rib 2
The position intersected with upper edge strip with rib 3 is loaded, and loading direction is along rib axis, and points to lower edge strip from upper edge strip；
3rd, analyze and draw four_point bending beam bending moment diagram, the region between rib 2 and rib 3 is that moment of flexure is equal
Simple bending tune, as test examination section；
4th, according to the sectional dimension at axis of symmetry, the size of assumed (specified) load p, as the slow test of four_point bending beam
Design load, wherein p=kw σb/ l, and stability check is carried out to pressurized edge strip, then carry out static(al) failure test；
5th, the fatigue life requirements in section according to selected by reinforcing frame, beam, in conjunction with the static(al) failure test of four_point bending beam
As a result, determine the fatigue test load spectrum of four_point bending beam, carry out fatigue test.
Described in p=kw σbIn the formula of/l, σbIt is the strength degree of four_point bending beam selected materials and technique, w is at 4 points
The bending resistant section coefficient in section at bent beam axis of symmetry, k is the plastic correcting coefficient in section at four_point bending beam axis of symmetry, l table
Show the distance between rib 2 and rib 3.
The invention has the advantage that
1) four_point bending beam testpieces is as the structural test part with typical reinforcing frame, beam feature, reacted reinforcing frame,
The stressing conditions of beam major section, use its research experiment, can be obviously reduced the scale of test, shorten the cycle of test simultaneously
Reduce development cost；
2) four_point bending beam testpieces be particularly suited for not concentrating load joint with bear based on bending load plus
Strong frame, the experimental study in the typical stress section of girder construction;
3) because four_point bending beam experimental scale is less, it is convenient for the contrast of reinforcing frame, the different materials of beam or technique
Experimental study;
4) easy four_point bending beam test fixture can be designed as shown in figure 4, carrying out on common testing machine at 4 points
Bent beam static(al)/fatigue test, test is simple, convenient.
Brief description
Accompanying drawing 1 is typical four-point bending girder construction
Accompanying drawing 2 is that four_point bending beam is supported, loaded sketch
Accompanying drawing 3 is four_point bending beam bending moment diagram
Accompanying drawing 4 is that the four_point bending beam with Simple clamp is supported, loaded schematic diagram
Accompanying drawing 5 is the four_point bending beam of reinforcing frame a typical section
Accompanying drawing 6 is the fatigue test load spectrum of reinforcing frame a typical section four_point bending beam
Accompanying drawing 7 is the welding four_point bending beam of reinforcing frame b
Accompanying drawing 8 is the fatigue test load spectrum that reinforcing frame b welds four_point bending beam
Specific embodiment
Below by specific embodiment and combine accompanying drawing the present invention is described in further detail.
Most preferred embodiment one:
First, reinforcing frame a is the main force support structure bearing main landing gear landing load, in order to improve reinforcing frame globality and
Production efficiency, intends adopting solid forging manufacture, due to not concentrating load joint on reinforcing frame a it is impossible to individually whole to reinforcing frame a
The real structure research experiment of body forging, by analyzing the stressing conditions of reinforcing frame a, chooses the bottom of its stress most serious
Section between lock bridge axis and 22 long joist axial line can be contained as the object of experimental study, the static(al)/fatigue behaviour in this section
The other section of lid.
2nd, design a four_point bending beam, using titanium alloy large-sized forging manufacture, web is arranged 4 ribs, respectively
As the support of fixing point and load(ing) point, fixing at the lower edge strip of two ribs farther out apart from axis of symmetry, forming freely-supported,
Load at the upper edge strip of two nearer ribs of axis of symmetry, physical dimension is as shown in Figure 5.
3rd, according to the sectional dimension at axis of symmetry, the size of assumed (specified) load p, as the slow test of four_point bending beam
Design load, wherein p=kw σb/ l=278569.2n(k=1.07, w=34559.08mm3, σb=1130mpa, l=150mm), simultaneously
The stability carrying out the pressurized edge strip of four_point bending beam is checked, σlin=σb, σlinRepresent the critical buckling strength of beam edge strip, Ran Houjin
The static(al) failure test of 2 four_point bending beam of row, static(al) failure test the results are shown in Table 1, compares with the design load of Theoretical Calculation
Difference 4.6%, thinks that the Theoretical Calculation of plastic correcting coefficient k has deviation to lead to actual.
The slow test load of the various typical section four_point bending beam of table 1
4th, carry out the fatigue test of four_point bending beam according to the fatigue test load spectrum of Fig. 6, the p in Fig. 6mRepresent above-mentioned
The meansigma methodss of slow test breaking load.Four_point bending beam completes the fatigue test of 100,000 times, does not produce destruction, reaches
The requirement of fatigue life.
Most preferred embodiment two:
First, reinforcing frame b is fabricated by using titanium alloy forging argon arc welding Joining Technology, for the technique improving part
Property, intend replacing argon arc welding using electron beam weldering, in order to compare the shadow of static(al)/fatigue behaviour to reinforcing frame b for two kinds of welding procedures
Ring, devise the four-point bending girder construction of two kinds of Type of Welding, weld seam is selected at the symmetrical section of four_point bending beam.
2nd, design two groups of four-point bending girder constructions, using titanium alloy forging manufacture, web is arranged 4 ribs, respectively
As the support of fixing point and load(ing) point, fixing at the lower edge strip of two ribs farther out apart from axis of symmetry, forming freely-supported,
Load at the upper edge strip of two nearer ribs of axis of symmetry, two groups of four-point bending girder constructions except be respectively adopted argon arc welding and
Outside electron beam weldering, remaining technique, shape and size are identical, and physical dimension is as shown in Figure 7.
3rd, according to the sectional dimension at axis of symmetry, the size of assumed (specified) load p, as the slow test of four_point bending beam
Design load, wherein p=kw σb/ l=221653.3mpa, (k=1.224, w=24038.4mm3, σb=1130mpa, l=150mm), with
The stability of Shi Jinhang four_point bending beam edge strip is checked, σlin=σb, then carry out static(al) failure test, the result of slow test is shown in
Table 1 is it can be seen that the static strength of two kinds of welding procedures is suitable.
4th, carry out the fatigue test of two groups of four_point bending beam according to the fatigue test load spectrum of Fig. 8, load at different levels in Fig. 8
For fi×pm, pmRepresent the meansigma methodss of above-mentioned slow test breaking load.Two groups of four_point bending beam all complete under ordinance load spectrum
The fatigue test of 30 circulations, has reached the fatigue life requirements of reinforcing frame b.
By the static(al)/Fatigue Test Research of above-mentioned two groups of four_point bending beam, show reinforcing frame a typical case stress section and
Reinforcing frame b is welded with electron beam and replaces argon arc welding can meet reinforcing frame static(al)/Fatigue Design requirement.
Claims (1)
1. a kind of reinforcing frame, beam single section static(al)/Test Method of Fatigue Behavior are it is characterised in that comprise the steps:
First, choose reinforcing frame, the section of beam needing research experiment；
Second, design a four_point bending beam, selection, manufacturing process are consistent with above-mentioned reinforcing frame, beam, with four_point bending beam
Intermediate cross-section is axis of symmetry, the shape and size in section and above-mentioned reinforcing frame, the shape and size of beam section at axis of symmetry
Unanimously, it is arranged symmetrically 4 ribs vertical with upper and lower edge strip and web, respectively as the support of fixing point and load(ing) point, in muscle
The position that bar 1 and rib 4 are intersected with lower edge strip, one end fixation is hinged, and one end is movably hinged, forms simply supported beam, in rib 2 and muscle
The position that bar 3 is intersected with upper edge strip loads, and loading direction is along rib axis, and points to lower edge strip from upper edge strip；
3rd, analyze and draw four_point bending beam bending moment diagram, the region between rib 2 and rib 3 is the equal simple bending of moment of flexure
Tune, as test examination section；
4th, according to the sectional dimension at axis of symmetry, the size of assumed (specified) load p, as the setting of slow test of four_point bending beam
Meter load, wherein p=kw σb/ l, and stability check is carried out to pressurized edge strip, then carry out static(al) failure test；
5th, the fatigue life requirements in section according to selected by reinforcing frame, beam, in conjunction with the static(al) failure test knot of four_point bending beam
Really, determine the fatigue test load spectrum of four_point bending beam, carry out fatigue test.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104477404B (en) * | 2014-11-19 | 2018-03-02 | 中国航空工业集团公司沈阳飞机设计研究所 | A kind of ground validation method of fuselage main force support structure part under big load |
| CN106644431B (en) * | 2016-11-30 | 2023-06-06 | 江西洪都航空工业集团有限责任公司 | Fixing clamp for fatigue test of undercarriage |
| CN106969909A (en) * | 2017-04-13 | 2017-07-21 | 哈尔滨工程大学 | A kind of box beam combination moment test mechanism |
| CN109357851B (en) * | 2018-10-17 | 2020-08-11 | 中国飞机强度研究所 | Four-point bending test loading method for curved frame structure of machine body |
| CN112254940A (en) * | 2019-07-05 | 2021-01-22 | 中车长春轨道客车股份有限公司 | Testing device and testing method for axle fatigue test |
| CN110470460A (en) * | 2019-08-12 | 2019-11-19 | 中国航空工业集团公司沈阳飞机设计研究所 | A kind of four_point bending beam and its experimental rig, test method |
| CN113326576B (en) * | 2021-04-14 | 2024-02-09 | 中国科学院金属研究所 | Method for evaluating fatigue strength of full-size component by using miniature sample test |
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