CN111398039A - Device and method for testing mechanical properties of seat cushion material under different strain rates - Google Patents
Device and method for testing mechanical properties of seat cushion material under different strain rates Download PDFInfo
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- CN111398039A CN111398039A CN202010370551.2A CN202010370551A CN111398039A CN 111398039 A CN111398039 A CN 111398039A CN 202010370551 A CN202010370551 A CN 202010370551A CN 111398039 A CN111398039 A CN 111398039A
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- 238000012360 testing method Methods 0.000 title claims abstract description 85
- 239000000463 material Substances 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 51
- 238000006073 displacement reaction Methods 0.000 claims abstract description 33
- 238000004154 testing of material Methods 0.000 claims abstract description 22
- 238000002474 experimental method Methods 0.000 claims abstract description 12
- 230000006835 compression Effects 0.000 claims description 69
- 238000007906 compression Methods 0.000 claims description 69
- 210000004197 pelvis Anatomy 0.000 claims description 5
- 230000001502 supplementing effect Effects 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 3
- 238000010998 test method Methods 0.000 claims 3
- 238000010586 diagram Methods 0.000 description 5
- 238000011160 research Methods 0.000 description 5
- -1 polyethylene Polymers 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- G—PHYSICS
- 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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- 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
- G01N3/02—Details
- G01N3/04—Chucks
-
- G—PHYSICS
- 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
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
-
- G—PHYSICS
- 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
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/068—Special adaptations of indicating or recording means with optical indicating or recording means
-
- 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
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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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
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
-
- 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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
- G01N2203/0423—Chucks, fixtures, jaws, holders or anvils using screws
-
- 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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
- G01N2203/0647—Image analysis
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
Abstract
The embodiment of the invention discloses a device and a method for testing the mechanical properties of a seat cushion material under different strain rates, wherein the device for testing the mechanical properties comprises the following components: indenter, backup pad and material experiment machine, the material experiment machine includes: the device comprises an upper clamping end, a lower clamping end, a moving shaft, a displacement sensor and a load sensor; the supporting plate is connected with the lower clamping end and used for placing an experimental piece on the upper end face of the supporting plate, and the experimental piece is used for simulating a seat cushion material; the pressure head is connected with the upper clamping end; the material testing machine is used for applying load to the test piece through the moving shaft and the upper clamping end so as to enable the test piece to generate compressive deformation, and testing load and displacement data in the loading and unloading process through the load sensor and the displacement sensor; the testing device is convenient to operate, easy to realize, high in experimental efficiency and free of special requirements for sizes of experimental pieces. The embodiment of the invention realizes the test and analysis of the compressive mechanical property of the seat cushion material under different strain rates, and has wide application prospect.
Description
Technical Field
The application relates to the technical field of material science and solid mechanics, in particular to a device and a method for testing mechanical properties of a seat cushion material under different strain rates.
Background
The seat cushion is used as a structural component directly contacting with a passenger, is widely applied to the fields of aviation, aerospace, ships, automobiles, high-speed rails and the like, can provide comfortable riding experience for the passenger, can absorb impact energy in the situations of collision, emergency landing and the like through large deformation of the seat cushion, reduces impact load borne by the passenger, and provides certain protection for the passenger. Under the action of dynamic load, the mechanical property of the seat cushion material is related to the loading rate, and the deformation and the loading of the seat cushion material are more related to the problems of material nonlinearity, geometric nonlinearity, contact nonlinearity and the like, so that the research on the compression mechanical property of the seat cushion material under different strain rates is necessary.
At present, few researches on quasi-static and dynamic compression mechanical properties of seat cushion materials are conducted at home and abroad, most of the researches are made of materials such as polyurethane, polyethylene, polypropylene and the like, and the researches mainly focus on the aspects of ergonomics, vibration, pressure distribution and the like. Therefore, it is necessary to provide a technical solution to research the mechanical performance of the seat cushion material under quasi-static compression and dynamic compression.
Disclosure of Invention
In order to solve the technical problems, the embodiment of the invention provides a device and a method for testing the mechanical properties of a seat cushion material under different strain rates, so that the compressive mechanical properties of the seat cushion material under different strain rates can be tested and analyzed.
The embodiment of the invention provides a device for testing the mechanical properties of a seat cushion material under different strain rates, which comprises: indenter, backup pad and material experiment machine, the material experiment machine includes: the device comprises an upper clamping end, a lower clamping end, a moving shaft, a displacement sensor and a load sensor, wherein the upper clamping end and the lower clamping end are symmetrically arranged;
the supporting plate is connected with the lower clamping end and used for placing an experimental piece on the upper end face of the supporting plate, and the experimental piece is used for simulating a seat cushion material; the pressure head is connected with the upper clamping end;
the material testing machine is used for applying load to the test piece through the moving shaft and the upper clamping end so as to enable the test piece to generate compressive deformation, and testing load and displacement data in the loading and unloading process through the load sensor and the displacement sensor.
Optionally, in the mechanical performance testing apparatus for seat cushion materials under different strain rates as described above, the material testing machine further comprises: a control computer respectively connected with the displacement sensor and the load sensor,
the control computer is used for controlling the loading and unloading modes of the material testing machine and processing the data tested by the displacement sensor and the load sensor;
the mechanical property testing device further comprises: the system comprises a light source, a high-speed camera arranged on one side of a test piece and a first computer connected with the high-speed camera;
the light source is used for supplementing light for the shooting process of the high-speed camera;
the high-speed camera and the first computer are used for shooting and recording the compression deformation process of the experimental piece.
Optionally, in the mechanical performance testing device of the seat cushion material under different strain rates, the assembling requirements of the mechanical performance testing device and the experimental part are as follows: the central shaft of the experimental part and the central shaft of the pressure head are arranged in a collinear way.
Optionally, in the mechanical performance testing device of the seat cushion material under different strain rates as described above, the pressure head is in a circular plate shape and is used for simulating the lumbar vertebra and pelvis of a driver, so as to obtain the real loaded condition of the aviation seat cushion.
Optionally, in the mechanical performance testing device of the seat cushion material under different strain rates, the surface of the supporting plate meets the parallelism of a preset standard;
the supporting plate is provided with a cutting groove along the thickness direction and used for air escaping from the center of the bottom of the supporting plate;
the supporting plate is provided with a through hole along the plane direction and is used for simulating a seat basin structure of the aviation seat, so that the real compression mechanical state of the seat cushion is obtained.
The embodiment of the invention also provides a mechanical property testing method of the seat cushion material under different strain rates, which is implemented by adopting the mechanical property testing device of the seat cushion material under different strain rates, and the mechanical property testing method comprises the following steps:
step 1, connecting a pressure head and an upper clamping end, and connecting a support plate and a lower clamping end;
and 8, closing the high-speed camera, the light source and the material tester after the experiment is finished.
Alternatively, in the method for testing the mechanical properties of the seat cushion material under different strain rates,
and in the step 2, the central axis of the experimental part is ensured to be collinear with the central axis of the pressure head, so that uniaxial loading is ensured.
Alternatively, in the method for testing the mechanical properties of the seat cushion material under different strain rates,
the precompression in the step 5 is used for simulating the sitting mode of the human body and extruding the seat cushion and the air in the seat cushion; after pre-compression the test piece was allowed to stand to allow the test piece to recover.
Alternatively, in the method for testing the mechanical properties of the seat cushion material under different strain rates,
the compression amount in the step 6 and the step 7 is more than or equal to 90% of the original thickness of the experimental piece, and the method is used for simulating the extreme loading condition of the seat cushion in the situations of airplane crash and the like;
and 6, testing the compression deformation process of the experimental piece in the step 7 and the step 6, and recording the complete loading process and the complete unloading process.
The device and the method for testing the mechanical properties of the seat cushion material under different strain rates, provided by the embodiment of the invention, can be used for testing the mechanical properties of an experimental piece of the seat cushion material under quasi-static compression and dynamic compression, and can be applied to the test and analysis of the mechanical properties of the seat cushion material under quasi-static compression and dynamic compression. According to the technical scheme of the embodiment of the invention, the accurate test and acquisition of the quasi-static and dynamic compression mechanical properties of the seat cushion material are realized by aiming at the test and analysis of the compression mechanical properties of the seat cushion material under different strain rates, and the invention has wide application prospect.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a schematic structural diagram of a mechanical property testing device for a seat cushion material under different strain rates according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a pressure head and a support plate in a mechanical property testing device of a seat cushion material under different strain rates, provided by an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
The following specific embodiments of the present invention may be combined, and the same or similar concepts or processes may not be described in detail in some embodiments.
Fig. 1 is a schematic structural diagram of a mechanical property testing device for a seat cushion material under different strain rates according to an embodiment of the present invention. The mechanical performance testing device for the seat cushion material provided by the embodiment under different strain rates can comprise: indenter 3, support plate 5, and a material testing machine that may include: an upper clamping end 2 and a lower clamping end 6 which are symmetrically arranged, a moving shaft 1 which is arranged on the top of the upper clamping end 2, a displacement sensor (not shown in the figure) which is connected with the moving shaft 1, and a load sensor 7 which is connected with the lower clamping end 6. It should be noted that, in the embodiment of the present invention, the positions of the upper holding end 2 and the lower holding end 6 are symmetrical, but the shapes of the two holding ends may be different.
As shown in the structure of the mechanical property testing device shown in fig. 1, a supporting plate 5 is connected with a lower clamping end 6 and used for placing an experimental piece 4 on the upper end surface of the supporting plate 5, and the experimental piece 4 is used for simulating a seat cushion material; the pressure head 3 is connected with the upper clamping end 2. In actual assembly, the pressure head 3 can be connected with the upper clamping end 2 in a screw connection mode, and can also be connected with the upper clamping end 2 in a close fit additional spring connection mode; the support plate 5 may be connected to the lower clamping end 6 by screwing or the like.
In the embodiment of the invention, the assembling requirements of the mechanical property testing device and the experimental part are as follows: the central axis of the experimental part 4 and the central axis of the pressure head 3 are arranged in a collinear manner, so that uniaxial loading is realized.
The material testing machine in the embodiment of the present invention is a main body for performing force loading and unloading, applies a load to the test piece 4 through the moving shaft 1 and the upper grip end 2 to cause the test piece 4 to generate compressive deformation, and tests load and displacement data in the loading and unloading process through the load cell 7 and the displacement cell.
The mechanical property testing device for the seat cushion material under different strain rates, provided by the embodiment of the invention, can be used for testing the mechanical property of an experimental piece of the seat cushion material under quasi-static compression and dynamic compression, and can be applied to the test and analysis of the mechanical property of the seat cushion material under quasi-static compression and dynamic compression.
Fig. 2 is a schematic structural diagram of a pressure head and a support plate in a mechanical property testing device of a seat cushion material under different strain rates, provided by an embodiment of the invention. The pressure head 3 in the embodiment of the invention can be in a circular plate shape and is used for simulating the lumbar vertebra and pelvis of a driver, so that the real loading condition of the aviation seat cushion is obtained; this is because, in the vertical direction, the impact load is mainly transmitted from the seat cushion to the lumbar vertebrae of the occupant through the pelvis of the occupant, whereas the seat cushion mainly receives the reaction force from the lumbar vertebrae and the pelvis of the occupant.
The surface of the support plate 5 in the embodiment of the invention meets the parallelism of the preset standard, and the surface of the support plate 5 is generally required to have higher parallelism so as to ensure uniaxial loading; in addition, the supporting plate 5 is subjected to grooving process in the thickness direction so that air escapes from the center of the bottom of the supporting plate 5; moreover, the supporting plate 5 is provided with a through hole along the plane for simulating the seat basin structure of the aviation seat, so that the real compression mechanical state of the seat cushion is obtained, and the test error of the compression mechanical property of the seat cushion material caused by the fact that the internal air cannot escape in time is avoided.
It should be noted that fig. 1 does not show the entire structure of the material testing machine, and only shows some of the structures related to the force loading.
Optionally, the material testing machine in the embodiment of the present invention may further include: a control computer 8 connected to the displacement sensor and the load sensor 7 respectively,
the control computer 8 is used for controlling the loading and unloading modes of the material testing machine and processing the data tested by the displacement sensor and the load sensor;
optionally, the mechanical property testing apparatus in the embodiment of the present invention may further include: a light source 11, a high-speed camera 9 arranged on one side of the experimental piece, and a first computer 10 connected with the high-speed camera 9;
the light source 11 is used for supplementing light for the shooting process of the high-speed camera 9;
a high-speed camera 9 and a first computer 10 for shooting and recording the compression deformation process of the experimental piece.
In the process of mechanical property testing, under medium and high strain rates, a common camera cannot capture the dynamic deformation process of an experimental piece generally, and a high-speed camera can be adopted in the experimental process; the light source is used for supplementing light in the shooting process of the high-speed camera so as to meet the shooting requirement.
The mechanical property testing device for the seat cushion material under different strain rates, provided by the embodiment of the invention, is convenient to operate, easy to realize, high in experimental efficiency and free of special requirements on the size of an experimental piece.
Based on the device for testing the mechanical properties of the seat cushion material under different strain rates provided by the embodiment of the invention, the embodiment of the invention also provides a method for testing the mechanical properties of the seat cushion material under different strain rates, the embodiment of the invention can adopt the device for testing the mechanical properties of the seat cushion material under different strain rates to execute the method for testing the mechanical properties, and the method for testing the mechanical properties can comprise the following steps:
step 1, connecting a pressure head with an upper clamping end, and connecting a support plate with a lower clamping end in a screw connection mode and the like;
and 8, closing equipment such as a high-speed camera, a light source and a material testing machine after the experiment is finished.
In the mechanical property testing method of the embodiment of the invention, the compression amount in the step 6 and the step 7 is more than or equal to 90% of the original thickness of the experimental piece, and the method is used for simulating the extreme loading condition of the seat cushion in the situations of airplane crash and the like;
and 6, testing the compression deformation process of the experimental piece in the step 7 and the step 6, and recording the complete loading process and the complete unloading process.
In addition, in the embodiment of the present invention, the quasi-static compression in step 6 is different from the dynamic compression in step 7 in compression speed, and generally, the quasi-static compression speed is slower and the dynamic compression speed is faster.
The device and the method for testing the mechanical properties of the seat cushion material under different strain rates, provided by the embodiment of the invention, can be used for testing the mechanical properties of an experimental part of the seat cushion material under quasi-static compression and dynamic compression, and can be applied to the test and analysis of the mechanical properties of the seat cushion material under quasi-static compression and dynamic compression. The mechanical property testing device for the seat cushion material under different strain rates, provided by the embodiment of the invention, is convenient to operate, easy to realize, high in experimental efficiency and free of special requirements on the size of an experimental piece. According to the technical scheme of the embodiment of the invention, the accurate test and acquisition of the quasi-static and dynamic compression mechanical properties of the seat cushion material are realized by aiming at the test and analysis of the compression mechanical properties of the seat cushion material under different strain rates, and the invention has wide application prospect.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A mechanical property testing device of a seat cushion material under different strain rates is characterized by comprising: indenter, backup pad and material experiment machine, the material experiment machine includes: the device comprises an upper clamping end, a lower clamping end, a moving shaft, a displacement sensor and a load sensor, wherein the upper clamping end and the lower clamping end are symmetrically arranged;
the supporting plate is connected with the lower clamping end and used for placing an experimental piece on the upper end face of the supporting plate, and the experimental piece is used for simulating a seat cushion material; the pressure head is connected with the upper clamping end;
the material testing machine is used for applying load to the test piece through the moving shaft and the upper clamping end so as to enable the test piece to generate compressive deformation, and testing load and displacement data in the loading and unloading process through the load sensor and the displacement sensor.
2. A mechanical testing device for seat cushion material under different strain rates according to claim 1, wherein the material testing machine further comprises: a control computer respectively connected with the displacement sensor and the load sensor,
the control computer is used for controlling the loading and unloading modes of the material testing machine and processing the data tested by the displacement sensor and the load sensor;
the mechanical property testing device further comprises: the system comprises a light source, a high-speed camera arranged on one side of a test piece and a first computer connected with the high-speed camera;
the light source is used for supplementing light for the shooting process of the high-speed camera;
the high-speed camera and the first computer are used for shooting and recording the compression deformation process of the experimental piece.
3. A mechanical performance testing device for seat cushion materials under different strain rates according to claim 1 or 2, wherein the assembling requirements of the mechanical performance testing device and the experimental piece are as follows: the central shaft of the experimental part and the central shaft of the pressure head are arranged in a collinear way.
4. A mechanical property testing device for seat cushion materials under different strain rates according to claim 1 or 2, wherein the pressure head is in a circular plate shape and is used for simulating lumbar vertebrae and pelvis of a driver so as to obtain a real loaded condition of the aviation seat cushion.
5. A mechanical performance testing device of seat cushion material under different strain rates according to claim 1 or 2, wherein the support plate surface meets a predetermined standard of parallelism;
the supporting plate is provided with a cutting groove along the thickness direction and used for air escaping from the center of the bottom of the supporting plate;
the supporting plate is provided with a through hole along the plane direction and is used for simulating a seat basin structure of the aviation seat, so that the real compression mechanical state of the seat cushion is obtained.
6. A method for testing mechanical properties of a seat cushion material under different strain rates, which is implemented by using the device for testing mechanical properties of the seat cushion material under different strain rates according to any one of claims 1 to 5, and comprises the following steps:
step 1, connecting a pressure head and an upper clamping end, and connecting a support plate and a lower clamping end;
step 2, placing the experimental piece on the supporting plate, and ensuring that the central axis of the experimental piece is collinear with the central axis of the pressure head;
step 3, turning on the light source and the high-speed camera, and recording the process of compression deformation of the experimental piece through the first computer;
step 4, opening the material testing machine, and starting to perform a mechanical property test experiment;
step 5, pre-compression: before formal compression, the experimental piece is compressed twice, and the compression amount of pre-compression is 75-80% of the original thickness of the experimental piece; after pre-compression, standing the experimental piece for 360 +/-60 seconds;
step 6, quasi-static compression: the compression amount is greater than or equal to 90% of the original thickness of the experimental piece, and load and displacement data in the loading and unloading process are tested through a load sensor and a displacement sensor of the material testing machine;
step 7, dynamic compression: the compression amount is greater than or equal to 90% of the original thickness of the experimental piece, and load and displacement data in the loading and unloading process are tested through a load sensor and a displacement sensor of the material testing machine;
and 8, closing the high-speed camera, the light source and the material tester after the experiment is finished.
7. A method of testing mechanical properties of a seat cushion material under different strain rates as recited in claim 6,
and in the step 2, the central axis of the experimental part is ensured to be collinear with the central axis of the pressure head, so that uniaxial loading is ensured.
8. A method of testing mechanical properties of a seat cushion material under different strain rates as recited in claim 6,
the precompression in the step 5 is used for simulating the sitting mode of the human body and extruding the seat cushion and the air in the seat cushion; after pre-compression the test piece was allowed to stand to allow the test piece to recover.
9. A method of testing mechanical properties of a seat cushion material under different strain rates as recited in claim 6,
the compression amount in the step 6 and the step 7 is more than or equal to 90% of the original thickness of the experimental piece, and the method is used for simulating the extreme loading condition of the seat cushion in the situations of airplane crash and the like;
and 6, testing the compression deformation process of the experimental piece in the step 7 and the step 6, and recording the complete loading process and the complete unloading process.
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| CN202010370551.2A CN111398039A (en) | 2020-04-30 | 2020-04-30 | Device and method for testing mechanical properties of seat cushion material under different strain rates |
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| CN202010370551.2A CN111398039A (en) | 2020-04-30 | 2020-04-30 | Device and method for testing mechanical properties of seat cushion material under different strain rates |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113551990A (en) * | 2021-06-29 | 2021-10-26 | 滁州市玉林聚氨酯有限公司 | Method for detecting internal heat generation of polyurethane material |
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