CN116066496A - Energy-absorbing pipe with curved surface is crease in advance - Google Patents
Energy-absorbing pipe with curved surface is crease in advance Download PDFInfo
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- CN116066496A CN116066496A CN202310035323.3A CN202310035323A CN116066496A CN 116066496 A CN116066496 A CN 116066496A CN 202310035323 A CN202310035323 A CN 202310035323A CN 116066496 A CN116066496 A CN 116066496A
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- 230000003014 reinforcing effect Effects 0.000 claims abstract description 14
- 239000006096 absorbing agent Substances 0.000 claims description 18
- 230000007704 transition Effects 0.000 claims description 7
- 239000011358 absorbing material Substances 0.000 claims description 3
- 210000002435 tendon Anatomy 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 11
- 230000003139 buffering effect Effects 0.000 abstract description 2
- 238000010521 absorption reaction Methods 0.000 description 19
- 238000010586 diagram Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F1/00—Springs
- F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F7/00—Vibration-dampers; Shock-absorbers
- F16F7/12—Vibration-dampers; Shock-absorbers using plastic deformation of members
- F16F7/123—Deformation involving a bending action, e.g. strap moving through multiple rollers, folding of members
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vibration Dampers (AREA)
Abstract
The invention provides an energy-absorbing tube with a curved surface pre-crease, and belongs to the technical field of buffering and energy-absorbing. The energy-absorbing tube comprises a plurality of cross rod rings which are arranged at intervals along the axis of the cross rod rings, wherein the cross rod rings are formed by connecting the cross rods formed by stretching the area surrounded by two crossed sinusoidal curves which take each side of a regular polygon as a chord, the two ends of each cross rod ring are provided with telescopic curved surfaces which extend along the axis of the cross rod rings, the telescopic curved surfaces are formed by surrounding the two crossed sinusoidal curves which are connected with the cross rod and are arranged at the side of the cross section of the axis, the middle part of the cross rod is connected with the telescopic curved surfaces through a vertical rod, the end parts of the telescopic curved surfaces and the end parts of the vertical rod are stretched to form reinforcing ribs which are connected end to end, the connecting lines of the end parts of the opposite cross rods in the adjacent cross rod rings and the connecting lines of the end parts of the opposite cross rods are pre-creasing curves, and the telescopic curved surfaces can absorb energy by shrinking along the pre-creasing curves, so that the rigidity is higher, the energy-absorbing effect is better and more stable.
Description
Technical Field
The invention relates to the technical field of buffering and energy absorption, in particular to an energy absorption tube with a curved surface pre-crease.
Background
Today, vehicles are frequently used, and people pay more attention to the use safety of vehicles such as automobiles, airplanes, trains, ships and the like, and a thin-wall energy absorption tube or energy absorption box is often used as a safety protection device in the vehicles. Numerous studies have been made on energy-absorbing pipes and boxes, and many new structures have been proposed, but currently, the commonly used energy-absorbing devices are mainly square pipes or round pipes.
The structural shape of the energy absorption tube and the material of the energy absorption tube play a main role in influencing the energy absorption effect of the energy absorption tube. Researchers have introduced pre-folds into the energy absorbing tube wall, for example: paper folding patterns, diamond patterns and the like, the energy absorption tube with the pre-folds introduced is more stable in deformation when being subjected to axial pressure, and the energy absorption effect is obviously improved.
Because the energy-absorbing tube with the pre-folds can bend along the pre-folds in the compression direction, the deformation mode of the energy-absorbing tube is stable and predictable, meanwhile, the connection between folds of the energy-absorbing tube with the pre-folds is mostly plastic hinge connection, and when the energy-absorbing tube is compressed, the plastic deformation of the plastic hinge can absorb a large amount of energy, so that the energy-absorbing tube with the pre-folds has better stability and better energy-absorbing effect compared with the traditional energy-absorbing tube.
However, most of the folds of the energy-absorbing tube with the pre-folds are the folds connected between the peaks, namely the linear folds, so that the degree of freedom of the folds of the energy-absorbing tube is greatly limited, and meanwhile, when the energy-absorbing tube is pressed, the stress at the folds is larger, and energy cannot be well dispersed into each plane, so that the energy-absorbing effect is weakened.
In view of the above, the present invention provides an energy absorbing tube with curved pre-folds, which has better stability and energy absorbing effect than the conventional pre-folded energy absorbing tube.
Disclosure of Invention
The invention aims to provide an energy-absorbing tube with a curved surface pre-crease, which can be buckled along the curved surface pre-crease, and has the advantages of higher rigidity, better energy-absorbing effect and more stability.
The invention provides an energy-absorbing tube with curved pre-folds, comprising: the cross rod rings are formed by connecting the cross rods formed by stretching areas surrounded by two crossed sinusoidal curves which take each side of a regular polygon as chords in an end-to-end mode, the two ends of each cross rod ring are provided with telescopic curved surfaces extending along the axes of the cross rod rings, the cross sections of the telescopic curved surfaces along the axes are side-arranged and are surrounded by two crossed sinusoidal curves connected with the cross rods, the middle parts of the cross rods are connected with the telescopic curved surfaces through vertical rods, the end parts of the telescopic curved surfaces and the end parts of the vertical rods are stretched to form reinforcing ribs connected end to end, connecting lines of the end parts of the corresponding cross rods in the adjacent cross rod rings and connecting lines of the end parts of the corresponding cross rods are pre-creased curves, and the telescopic curved surfaces can shrink along the pre-creased curves.
Preferably, the regular polygon is regular hexagon, and each cross bar ring is formed by six cross bars in a head-to-tail connection mode in sequence.
Preferably, the inner sides and the outer sides of the end parts of the adjacent cross bars are in transitional connection through fillets, and each fillet is tangent to each sinusoidal curve.
Preferably, the outer sides of the end parts of the cross bars are connected in a transition mode through round corners to form a protruding structure, and the rigidity of the protruding structure can be adjusted through adjusting the radius of the round corners.
Preferably, the inner side and the outer side of the end parts of the adjacent reinforcing ribs are connected through a fillet transition.
Preferably, the outer and inner sides of the pole are each constructed from a different sinusoidal extension.
Preferably, the period and amplitude of each sinusoidal curve is adjustable, which in turn adjusts the stiffness of the crossbar loop, the telescoping curved surface or the upright.
Preferably, the reinforcing ribs and the cross bar ring have equal thicknesses in the axial direction thereof.
Preferably, the connecting block at the joint of the vertical rod and the cross rod is a cube with the thickness equal to that of the cross rod.
Preferably, the cross bar ring, the telescopic curved surface and the upright rod are all made of deformable energy absorbing materials.
Compared with the prior art, the invention has the following beneficial effects:
1) The energy-absorbing tube is pre-folded into a curved surface with variable thickness, the rigidity of the pre-folded energy-absorbing tube can be well improved on the premise of ensuring buckling along the direction of the pre-folded, most of traditional pre-folded energy-absorbing tube structures are good in buckling stability or high in rigidity, but the structure with good buckling stability and relatively high rigidity is difficult to realize, and the energy-absorbing tube can be buckled along the pre-designed direction and has high rigidity;
2) The pre-creasing of the energy-absorbing tube is a sine curve with a half period, compared with the traditional linear creasing, the bending degree limitation of the energy-absorbing tube is greatly reduced, the stress at the crease of the traditional pre-creasing energy-absorbing tube is concentrated, the energy absorption on the surface around the crease is limited, the bearing surface around the pre-creasing of the sine curve is a curved surface, and compared with a plane, the bearing capacity of the bearing surface is more considerable;
3) The cross section structure of the energy absorption tube has gradient, and the energy absorption effect of the structure can be effectively improved while the structure is lighter through the transverse variable thickness of the telescopic curved surface, the cross rod, the vertical rod and the reinforcing rib;
4) When the energy-absorbing pipe is pressed, a space triangle support is formed at the intersection of the cross bars, so that the rigidity is further improved, and the energy-absorbing effect of the energy-absorbing pipe is enhanced;
5) The rigidity of each structure of the energy-absorbing pipe can be adjusted by changing parameters of the sinusoidal curve, and the rigidity of each structure of the energy-absorbing pipe can be adjusted by adjusting the period and amplitude ratio of the sinusoidal curve, so that the rigidity of the whole structure can be changed only by changing part of parameters, and the energy-absorbing pipe is more convenient and effective to adapt to various occasions.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a curved pre-creased energy absorber tube in accordance with the present invention;
FIG. 2 is a structural diagram of a curved pre-creased energy absorber tube in accordance with the present invention;
FIG. 3 is a schematic overall cross-sectional view of a curved pre-creased energy-absorbing tube in accordance with the present invention;
FIG. 4 is an enlarged schematic view of a portion of the cross bar loop structure of the curved pre-creased energy-absorbing tube of the present invention;
FIG. 5 is a schematic view of the structure of a vertical rod of a curved pre-creased energy-absorbing tube in the present invention;
FIG. 6 is a schematic cross-sectional view of the telescoping curved surface of the curved surface pre-creased energy absorber tube of the present invention;
FIG. 7 is an enlarged schematic view of a portion of the reinforcement structure of a curved pre-creased energy-absorbing tube in accordance with the present invention;
FIG. 8 is a schematic illustration of the convex structure of a curved pre-creased energy absorber tube of the present invention;
FIG. 9 is a simulated view of a curved pre-creased energy absorber tube under each strain in accordance with the present invention;
FIG. 10 is a graph of specific energy absorption at various strains of a curved pre-creased energy-absorbing tube in accordance with the present invention;
FIG. 11 is a force versus displacement graph of a curved pre-creased energy absorber tube in accordance with the present invention.
Reference numerals illustrate:
1: reinforcing ribs; 2: a cross bar ring; 201: a cross bar; 3: a retractable curved surface; 4: a vertical rod; 5: a bump structure; 6: and (5) connecting a block.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise. Furthermore, the terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1-8, the present invention proposes an energy absorber tube with curved pre-folds, comprising: the energy-absorbing tube comprises a plurality of cross bar rings 2 which are arranged at intervals along the axis direction of the energy-absorbing tube, wherein each cross bar ring 2 is formed by connecting a plurality of cross bars 201 formed by stretching a region surrounded by two crossed sinusoidal curves F (x) and G (x) which take each side of a regular polygon as a chord end to end, the two ends of each cross bar ring 2 are provided with telescopic curved surfaces 3 which extend along the axis, the telescopic curved surfaces 3 are surrounded by two crossed sinusoidal curves P (x) and Q (x) which are laterally arranged along the axis cutting direction and are connected with the cross bars 201, the region is rotationally stretched for 360 degrees around the axis of the energy-absorbing tube, the telescopic curved surfaces 3 can be obtained, the middle part of the cross bars 201 is connected with the telescopic curved surfaces 3 through vertical bars 4, the end parts of the telescopic curved surfaces 3 and the end parts of the vertical bars 4 are stretched to form reinforcing bars 1 which are connected end to end, the connecting lines of the opposite end parts of the cross bars 201 in the adjacent cross bar rings 2 and the end connecting lines of the reinforcing bars 1 are pre-creased curves, the pre-creased curves are the telescopic curved surfaces 3, and the telescopic curved surfaces 3 can shrink along the pre-creased curve directions.
Specifically, as shown in fig. 3 and 4, the regular polygon is a regular hexagon, and each rail ring 2 is formed by sequentially connecting six rails 201 end to end. The specific design steps are as follows: half of the period of the sinusoidal curves F (x) and G (x) is the side length of a regular hexagon, then the two sinusoidal curves F (x) and G (x) are arrayed in a circumferential array by taking the circle center of the regular hexagon as the rotation center, six sinusoidal curves F (x) and G (x) are connected end to end, then the inner side and the outer side of the joint of the cross rod 201, which is surrounded by each adjacent sinusoidal curve F (x) and G (x), are subjected to rounding treatment, so that the cross rod ring 2 can be obtained through the transition connection of round corners, each round corner is tangent to each sinusoidal curve, and then the cross rod 201 is stretched for a length t along the axis direction. The horizontal rod 201 is arranged around the connecting line circumference array of the axle center and the wave crest for 90 degrees, then a horizontal reference surface of the upper surface of the horizontal rod ring 2 is established at a distance h (the distance between the adjacent horizontal rod rings 2), and the outside is stretched and cut, so that the vertical rod 4 can be obtained; then, a reference plane is established to pass through the connecting part of the sinusoids and the axis of the cross rod ring 2, two new sinusoids P (x) and Q (x) are established on the reference plane, the surface surrounded by the two new sinusoids P (x) and Q (x) and the side surface of the upright rod 4 are taken as two lofting planes, the lofting boss is carried out by taking the sinusoids F (x) and G (x) as guide lines, and the telescopic curved surface 3 is pulled out; and then, the upper surface of the vertical rod 4 and the upper surface of the telescopic curved surface 3 are taken as sketch stretching distances t, so that the reinforcing rib 1 can be obtained, and the curved surface pre-creased energy-absorbing tube can be obtained by arranging all the components.
In this embodiment, as shown in fig. 3, 4, 7 and 8, the thicknesses of the reinforcing rib 1 and the cross bar ring 2 along the axial direction are equal to t, the outer sides of the end portions of the cross bars 201 are connected through fillet transition to form a protruding structure 5, and the rigidity of the protruding structure 5 can be adjusted by adjusting the radius R1 and R2 of the inner fillet and the outer fillet. The inner sides and the outer sides of the end parts of the adjacent reinforcing ribs 1 are connected through fillet transition, and the rigidity of the reinforcing ribs 1 can be adjusted by adjusting the radius R1 and the radius R2 of the inner fillet and the outer fillet. Through carrying out the filleting to horizontal pole circle 2 and strengthening rib 1 and handling, can change the energy-absorbing effect of structure through the thin degree of changing the corner by adjusting the radius of fillet, the phenomenon of reduction stress concentration that simultaneously can be better increases the stability of structure.
In this embodiment, as shown in fig. 3 and 6, the curved surface pre-creased energy absorbing tube has an overall height H, an overall width L, and a height H at the joint of the telescopic curved surface 3, and the inner and outer sinusoidal curves of the telescopic curved surface 3 are P (x) and Q (x).
As shown in fig. 2 and 5, the outer and inner sides of the pole 4 are each constructed by a different sinusoidal curve F (x), G (x) extension. The length of the upper section of the vertical rod 4 is a, and the width is b; the connecting block 6 at the joint of the upright rod 4 and the cross rod 201 is a cube with the same thickness as the cross rod 201, namely, the lower section of the upright rod 4 is square with the side length t.
In this embodiment, the cross bar loop 2, the telescopic curved surface 3 and the upright 4 are all made of deformable energy absorbing materials. In this embodiment, the period and amplitude of each sinusoidal curve F (x), G (x), P (x), Q (x) can be adjusted, so that the rigidity of the crossbar loop 2, the telescopic curved surface 3, or the upright 4 can be adjusted.
In this embodiment, the energy absorber tube configuration parameters with curved pre-folds are as follows:
H＝68mm；L＝49.61mm；h＝9mm；t＝2mm；R1＝1mm；R2＝0.45mm；
a＝2mm；b＝1.65mm；
fig. 9 is a simulation diagram of the above-mentioned construction parameter energy absorbing tube under the strain epsilon=0, 0.2, 0.4, 0.6, 0.8, and fig. 11 is a force-displacement graph of the curved pre-creased energy absorbing tube according to the present invention, and it can be seen from the above-mentioned strain simulation diagram and force-displacement graph that the above-mentioned construction parameter energy absorbing tube can maintain stable structure under each strain. FIG. 10 is a graph showing the specific energy absorption at each strain of the curved pre-creased energy absorption tube according to the present invention, and it can be seen from the above graph that the energy absorption tube with the above-mentioned structural parameters can ensure stable energy absorption characteristics and good energy absorption effect at each strain.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (10)
1. An energy absorber tube with curved pre-creasing, comprising: the cross rod rings are formed by connecting the cross rods formed by stretching areas surrounded by two crossed sinusoidal curves which take each side of a regular polygon as chords in an end-to-end mode, the two ends of each cross rod ring are provided with telescopic curved surfaces extending along the axes of the cross rod rings, the cross sections of the telescopic curved surfaces along the axes are side-arranged and are surrounded by two crossed sinusoidal curves connected with the cross rods, the middle parts of the cross rods are connected with the telescopic curved surfaces through vertical rods, the end parts of the telescopic curved surfaces and the end parts of the vertical rods are stretched to form reinforcing ribs connected end to end, connecting lines of the end parts of the corresponding cross rods in the adjacent cross rod rings and connecting lines of the end parts of the corresponding cross rods are pre-creased curves, and the telescopic curved surfaces can shrink along the pre-creased curves.
2. The energy absorber tube with curved pre-creasing according to claim 1, wherein said regular polygon is a regular hexagon, and each of said beam loops is surrounded by six beams connected end to end in sequence.
3. The energy absorber tube with curved pre-creasing according to claim 1, wherein the inner and outer sides of the ends of adjacent crossbars are each transitional connected by rounded corners, and each rounded corner is tangent to each sinusoidal curve.
4. The energy absorber tube with curved pre-creasing according to claim 3, wherein the outer sides of the ends of the cross-bars are connected by a rounded transition to form a convex structure, the stiffness of which is adjustable by adjusting the rounded radius.
5. The energy absorber tube with curved pre-creasing of claim 1, wherein the inner and outer sides of the ends of adjacent ones of said tendons are each connected by a rounded transition.
6. The energy absorber tube with curved pre-creasing of claim 1, wherein said outer side and inner side of said upright are each constructed from different sinusoidal extensions.
7. The energy absorber tube with curved pre-creasing according to claim 1 or 6, wherein the period and amplitude of each sinusoidal curve is adjustable, thereby adjusting the stiffness of the beam loops, the telescoping curved surface or the upright.
8. The energy absorber tube with curved pre-creasing according to claim 1, wherein said reinforcing ribs and said beam rings are of equal thickness along their axes.
9. The energy absorber tube with curved pre-creasing according to claim 6, wherein the connecting block at the junction of said upright and said cross bar is a cube of equal thickness to said cross bar.
10. The energy absorber tube with curved pre-creasing according to claim 1, wherein said cross bar loop, said telescoping curved surface and said upright are all made of a deformable energy absorbing material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310035323.3A CN116066496A (en) | 2023-01-10 | 2023-01-10 | Energy-absorbing pipe with curved surface is crease in advance |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310035323.3A CN116066496A (en) | 2023-01-10 | 2023-01-10 | Energy-absorbing pipe with curved surface is crease in advance |
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| CN116066496A true CN116066496A (en) | 2023-05-05 |
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