CN110108577B - Axial bending loading device for thin-wall structure - Google Patents
Axial bending loading device for thin-wall structure Download PDFInfo
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- CN110108577B CN110108577B CN201910449781.5A CN201910449781A CN110108577B CN 110108577 B CN110108577 B CN 110108577B CN 201910449781 A CN201910449781 A CN 201910449781A CN 110108577 B CN110108577 B CN 110108577B
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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Abstract
The utility model provides a thin-walled structure axial bending loading device, thin-walled structure axial bending loading device include loading terminal surface and fixed terminal surface, fixes the thin-walled structure between loading terminal surface and fixed terminal surface, wherein: the loading end face is provided with a rotating shaft, the rotating shaft is supported by a bearing, the bearing is arranged in a bearing support, and when a load is applied to the loading end face, the loading end face can rotate around the axis line of the rotating shaft; the loading end face also has a recess on the side facing the fixed end face, the recess being dimensioned such that, when one end of the thin-walled structure is mounted in the recess, the end face centre line of the end of the thin-walled structure coincides with the axis of the rotation shaft, so that upon rotation of the loading end face about the axis of the rotation shaft, the thin-walled structure bends along the end face centre line.
Description
Technical Field
The disclosure relates to an axial bending loading device for a thin-wall structure.
Background
Because two airflow channels of the parallel turbine combined cycle (TBCC) engine are arranged in parallel, the mounting structure of the TBCC engine has the characteristics of a multi-branch force transmission path and a plurality of mounting units, and is obviously different from the traditional turbojet turbofan engine. Meanwhile, due to the design requirement of the flying/flying integration of the air inlet and the air outlet device, the air inlet channel and the unilateral expansion nozzle are of a binary structure, the structural form is closely related to the layout of an airplane, and the turbine base, the jet flow pre-cooling section and the stamping combustion chamber are of axisymmetric structures. The structures of inlet ducts, exhaust nozzles, transition sections, etc. therefore usually take the form of asymmetrical cross-sections or irregular geometries with curved force transmission paths. The deformation of the force transmission structures with the asymmetric sections under the working condition is obviously different from the axial symmetry structure of the conventional turbojet turbofan engine. In the design of the asymmetrical cross-section structures, test tests need to be carried out to check the calculation and analysis results, but in the process of loading tests, the structures are easy to generate additional axial tension, compression load and other problems when being bent along the axial direction of a central line.
Disclosure of Invention
In order to solve at least one of the above technical problems, the present disclosure provides an axial bending loading device for a thin-wall structure, which can achieve central bending along an end face of the thin-wall structure, especially an asymmetric thin-wall structure with a round-to-square shape, a rectangular bending shape, a rectangular variable cross section, and the like, without generating additional axial tension and compression loads. The method is realized through the following technical scheme.
According to an aspect of the present disclosure, a thin-walled structure axial bending loading device includes a loading end surface and a fixing end surface, the thin-walled structure is fixed between the loading end surface and the fixing end surface, wherein: the loading end face is provided with a rotating shaft, the rotating shaft is supported by a bearing, the bearing is arranged in a bearing support, and when a load is applied to the loading end face, the loading end face can rotate around the axis line of the rotating shaft; the loading end face also has a recess on the side facing the fixed end face, the recess being dimensioned such that, when one end of the thin-walled structure is mounted in the recess, the end face centre line of the end of the thin-walled structure coincides with the axis of the rotation shaft, so that upon rotation of the loading end face about the axis of the rotation shaft, the thin-walled structure bends along the end face centre line.
According to at least one embodiment of the present disclosure, the loading device further includes a loading end, the loading end is mounted on the loading end surface, and the loading end surface can be rotated around the axis line of the rotating shaft by applying a load to the loading end.
According to at least one embodiment of the present disclosure, the fixed end face has an adjustable mounting hole thereon for fixedly mounting thin-walled structures having different end face dimensions.
According to at least one embodiment of the present disclosure, the loading device comprises two coaxial rotary shafts, each of which is supported by a respective bearing, each bearing being mounted in its bearing support.
According to at least one embodiment of the present disclosure, the bearing support includes an upper bearing support and a lower bearing support, and the bearing is mounted between the upper bearing support and the lower bearing support.
According to at least one embodiment of the present disclosure, the loading device further includes a bracket and a bottom plate, the bracket is used for supporting and fixing the fixed end face; the support, the fixed end face and the lower bearing support are arranged on the bottom plate.
According to at least one embodiment of the present disclosure, the depth of the recess is expressed as D ═ D/2+ t, where D denotes the depth of the recess, D denotes the diameter of the rotating shaft, and t denotes the thickness of the flange of the thin-walled structure at the end mounted in the recess.
According to at least one embodiment of the present disclosure, a sectional shape of the recess coincides with a sectional shape of the flange.
According to at least one embodiment of the present disclosure, a vertically downward load is applied to the loading end at the center of the upper end face thereof by a material testing machine.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.
FIG. 1 is a schematic structural view of a thin-walled structure axial bend loading apparatus according to at least one embodiment of the present disclosure.
Fig. 2 is a schematic illustration of a recess configuration of a front loading end face according to at least one embodiment of the present disclosure.
Fig. 3 is a schematic view of a rear fixture face configuration in accordance with at least one embodiment of the present disclosure.
Detailed Description
The present disclosure will be described in further detail with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the present disclosure. It should be further noted that, for the convenience of description, only the portions relevant to the present disclosure are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
In one embodiment of the present disclosure, the thin-walled structure axial bending loading device includes a loading end surface and a fixing end surface, and the thin-walled structure is fixedly installed between the loading end surface and the fixing end surface. The loading end face is provided with a rotating shaft, the rotating shaft is supported by a bearing, the bearing is sleeved on the rotating shaft, and the bearing is arranged in the bearing support. When a load is applied to the loading end face, the loading end face can rotate around the center of the bearing under the constraint of the bearing and the bearing support, namely the loading end face can rotate around the axis line of the rotating shaft. The loading end face is also provided with a concave part, and the concave part is positioned on one side of the loading end face, which faces the fixed end face. One end of the thin-wall structure is arranged in the concave part, and the design of the concave part can enable the end surface center line of the end to be coincident with the axis line of the rotating shaft, so that the loading end surface drives the thin-wall structure to bend along the end surface center line when rotating around the axis line of the rotating shaft. The end surface of the thin-walled structure at the end mounted in the recess is symmetrical in shape, and when the thin-walled structure is bent along the center line of the end surface, the resultant force of the axial tension and compression loads applied to the end surface is zero.
Specifically, as shown in fig. 1 and 2, the thin-wall test piece (thin-wall structure) 9 may be a round-to-square thin-wall structure, where two end surfaces of the thin-wall test piece 9 are a round end surface and a square end surface, respectively. The round end face can be connected with the front loading end face 1, the square end face is connected with the rear fixing end face 7, and the thin-wall test piece 9 is fixed between the front loading end face 1 and the rear fixing end face 7. The shapes of the front loading end face 1 and the rear fixing end face 7 can be reasonably set according to needs, for example, the front loading end face and the rear fixing end face can be set to be rectangular or square block-shaped structures, and the thicknesses of the front loading end face and the rear fixing end face can also be set to be different according to actual needs. The front loading end face 1 has a rotary shaft and a recess, wherein the rotary shaft is supported by a corresponding bearing 4, the bearing 4 is placed on the rotary shaft, and the bearing 4 is fixed on the bearing support 2, 3. Under the restraint of the bearing 4 and the supports 2 and 3, the front loading end face 1 can rotate around the center of the bearing through a rotating shaft, namely the loading end face can rotate around the axis line of the rotating shaft. The concave part on the front loading end surface 1 is positioned on one side of the front loading end surface 1 facing the rear fixing end surface 7, namely, the connecting part of the front loading end surface 1 and the thin-wall test piece 9, and one end of the thin-wall test piece 9 is arranged in the concave part. When the depth of the concave portion is set, when one end of the thin-wall test piece 9 is installed in the concave portion, the end surface center line of the end of the thin-wall test piece 9 is overlapped with the axis line of the rotating shaft, so that when the front loading end surface 1 rotates along the axis line of the rotating shaft, the thin-wall test piece 9 can be driven to bend along the end surface center line. The bending center of the thin-wall test piece 9 is limited to the center of the end surface of the thin-wall test piece 9 by the concave part and the rotating shaft on the front loading end surface 1 and the binding of the bearing 4 and the supports 2 and 3, and the thin-wall test piece 9 can be bent without generating additional axial tension and compression loads.
In one embodiment of the present disclosure, the loading device may further include a loading end 6, the loading end 6 may be a rectangular block structure having the same height as the front loading end surface 1, as shown in fig. 1, and the loading end 6 may be vertically installed on the front loading end surface 1 on a side opposite to the recess. Preferably, the center of the loading end 6 is located on the same plane as the center of the front loading end face 1 and the end face center line of the thin-walled test piece 9. By applying a vertical downward load to the center of the upper end surface of the loading end 6, the front loading end surface 1 can rotate around the center of the bearing 4 under the constraint of the bearing 4 and the supports 2 and 3, namely the front loading end surface 1 can rotate around the axis of the rotating shaft.
In one embodiment of the present disclosure, the loading means comprises two coaxial rotation shafts symmetrically mounted on two opposite sides of the front loading end face 1, respectively, each rotation shaft being supported by a respective bearing 4, each bearing 4 being mounted in a respective bearing support 2,3, respectively.
In one embodiment of the present disclosure, in consideration of the overall structural design of the loading device, the bearing supports 2 and 3 may be composed of an upper bearing support 2 and a lower bearing support 3, as shown in fig. 1, the upper bearing support 2 and the lower bearing support 3 may be rectangular block-shaped structures, which facilitates the assembly and disassembly and the assembly with the bearing 4, and the size of the rectangle may be reasonably set according to actual needs. The upper end of the upper bearing support 2 and the lower end of the lower bearing support 3 can be respectively provided with an arc-shaped groove for installing the bearing 4, so that the bearing 4 is clamped between the upper bearing support 2 and the lower bearing support 3. The upper bearing support 2 and the lower bearing support 3 can be connected into a whole through bolts.
In one embodiment of the present disclosure, the depth of the recess on the front loading end face 1 may be expressed as D ═ D/2+ t, where D denotes the depth of the recess, D denotes the diameter of the rotating shaft, and t denotes the flange thickness of the end of the thin-walled test piece 9 mounted in the recess; typically D > 2 t.
In an embodiment of the present disclosure, when one end of the thin-wall test piece 9 is connected to the front loading end face 1 through a flange, the cross-sectional shape of the concave portion may be set to be consistent with that of the flange, at this time, one end of the thin-wall test piece 9 may be clamped in the concave portion, and the connection between the thin-wall test piece 9 and the front loading end face 1 is firmer, which is more beneficial to axial bending of the thin-wall test piece 9.
In one embodiment of the present disclosure, a concave portion may be provided at a connection portion of the rear fixing end surface 7 and the square end surface of the thin-walled test piece 9, and the square end surface of the thin-walled test piece 9 is mounted in the concave portion. The shape and size of the concave part can be reasonably set according to experience and actual needs, for example, the concave part can be set to be slightly larger than a round concave part with a square end surface, as shown in fig. 3, the square end surface of the thin-wall test piece 9 is installed in the round concave part, and the thin-wall test piece 9 is fixedly connected with the rear fixing end surface 7.
Preferably, the square end face of the thin-wall test piece 9 is fixedly connected with the rear fixing end face 7 through a flange.
In one embodiment of the present disclosure, a plurality of symmetrically distributed adjustable mounting holes 10, for example, oblong mounting holes, may be provided on the rear fixing end surface 7 for the fixed connection of the rear fixing end surface 7 with thin-walled test pieces 9 having different end surface dimensions. When the size of the end face of the thin-wall test piece 9 is increased or reduced, the position of the connecting bolt in the adjustable mounting hole 10 only needs to be adjusted.
In an alternative embodiment of the present disclosure, as shown in fig. 1, the loading device may further include a base plate 5 and a bracket 8, and the bracket 8 may be installed at a rear side of the rear fixing end surface 7 for supporting and fixing the rear fixing end surface 7. Other components of the loading device, including the lower bearing support 3, the rear fixed end face 7 and the bracket 8, are fixedly mounted on the bottom plate 5. According to the length of the thin-wall test piece 9, the mounting positions of the lower bearing support 3 and the bottom plate 5 can be adjusted, and the positions of the lower bearing support and the bottom plate are locked by screws. During the test, the base plate 5 is horizontally placed on a test bed.
Alternatively, the bracket 8 may be a right-angle bracket, and after the right-angle bracket is mounted on the rear fixing end surface 7 by a screw, the rear fixing end surface 7 and the right-angle bracket 8 are fixed on the bottom plate 5. The number of the right-angle brackets 8 can be 2 or more, and the right-angle brackets are respectively arranged at symmetrical positions at the rear side of the rear fixing end surface 7.
As shown in fig. 1, when the front loading end face 1, the rear fixing end face 7, the upper bearing support 2, the lower bearing support 3, the bearing 4, the bottom plate 5, the loading end 6, the bracket 8 and the thin-wall test piece 9 are assembled, the bottoms of the front loading end face 1 and the loading end 6 should not contact the bottom plate 5, that is, a certain space is left between the bottoms of the front loading end face 1 and the loading end 6 and the bottom plate 5 for the rotation of the front loading end face 1.
In one embodiment of the disclosure, the method for loading the axial bending of the thin-wall structure by using the loading device comprises the following steps:
connecting the loading device with a material testing machine, and applying a vertical downward load to the center of the upper end face of the loading end 6 through the material testing machine;
based on the vertical downward load and the constraint of the bearing 4 and the supports 2 and 3, the front loading end face 1 rotates around the center of the bearing 4 through a rotating shaft, namely the front loading end face 1 rotates around the axis line of the rotating shaft;
because the axis of the rotating shaft of the front loading end face 1 is superposed with the end face center line of one end of the thin-wall test piece 9 installed in the concave part, the thin-wall test piece 9 is driven to bend along the end face center line when the front loading end face 1 rotates around the axis of the rotating shaft, the bending center of the thin-wall test piece 9 is strictly limited in the end face center, and no extra axial tension and compression load is generated.
In conclusion, the thin-wall structure axial bending loading device disclosed by the disclosure is used for solving the problem of axial bending test loading along the central line of an irregular geometric structure with an asymmetric section or a bending force transmission path in the prior art, and realizes that the thin-wall structure, particularly the asymmetric thin-wall structure with a circular-to-square shape, a rectangular bending shape, a rectangular variable section and the like, is bent along the central line of the end face, and meanwhile, the effect of extra axial tension and compression loads is not generated.
It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of illustration of the disclosure and are not intended to limit the scope of the disclosure. Other variations or modifications may occur to those skilled in the art, based on the foregoing disclosure, and are still within the scope of the present disclosure.
Claims (9)
1. An axial bending loading device for a thin-walled structure, comprising a loading end face and a fixing end face between which the thin-walled structure is fixed, wherein:
a rotating shaft is arranged on the loading end face, the rotating shaft is supported by a bearing, the bearing is arranged in a bearing support, and when a load is applied to the loading end face, the loading end face can rotate around the axis line of the rotating shaft;
the loading end face also has a recess on a side facing the fixed end face, the recess being dimensioned such that, when one end of the thin-walled structure is mounted in the recess, an end face centre line of the end of the thin-walled structure coincides with the axis of the rotating shaft, thereby enabling the thin-walled structure to bend axially along the end face centre line when the loading end face rotates about the axis of the rotating shaft.
2. The loading device of claim 1,
the loading device further comprises a loading end, the loading end is installed on the loading end face, and the loading end face can rotate around the axis of the rotating shaft by applying load to the loading end.
3. The loading device of claim 1,
the fixed end face is provided with an adjustable mounting hole so as to fixedly mount thin-wall structures with different end face sizes.
4. The loading device according to any one of claims 1 to 3,
the loading means comprise two coaxial rotary shafts, each supported by a respective bearing, each bearing being mounted in its bearing support.
5. The loading device of claim 4,
the bearing support comprises an upper bearing support and a lower bearing support, and the bearing is arranged between the upper bearing support and the lower bearing support.
6. The loading device of claim 5,
the loading device also comprises a bracket and a bottom plate, wherein the bracket is used for supporting and fixing the fixed end face; the support, the fixed end face and the lower bearing support are arranged on the bottom plate.
7. The loading device of claim 1,
the depth of the recess is expressed as D/2+ t, where D denotes the depth of the recess, D denotes the diameter of the rotating shaft, and t denotes the thickness of the flange at the end of the thin-walled structure mounted in the recess.
8. The loading device of claim 7,
the cross-sectional shape of the recess corresponds to the cross-sectional shape of the flange.
9. The loading device of claim 2,
and applying a vertically downward load to the loading end at the center of the upper end face of the loading end by a material testing machine.
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| CN201910449781.5A CN110108577B (en) | 2019-05-28 | 2019-05-28 | Axial bending loading device for thin-wall structure |
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| CN111521499B (en) * | 2020-05-21 | 2021-11-30 | 中国矿业大学(北京) | Device and method for asymmetric stress loading of deep-ground engineering similar physical simulation experiment |
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