CN113295548A - Plastic high-cold atmospheric environment-bending fatigue cooperative acceleration test method - Google Patents
Plastic high-cold atmospheric environment-bending fatigue cooperative acceleration test method Download PDFInfo
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- CN113295548A CN113295548A CN202110705434.1A CN202110705434A CN113295548A CN 113295548 A CN113295548 A CN 113295548A CN 202110705434 A CN202110705434 A CN 202110705434A CN 113295548 A CN113295548 A CN 113295548A
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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
- G01N3/20—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
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
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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
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating 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
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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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
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
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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
- G01N2203/0014—Type of force applied
- G01N2203/0023—Bending
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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
- G01N2203/0073—Fatigue
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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
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0228—Low temperature; Cooling means
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Abstract
The invention discloses a plastic severe cold atmospheric environment-bending fatigue cooperative acceleration test method which comprises the following steps of sequentially carrying out a bending fatigue test under a severe cold atmospheric outdoor environment and a static exposure test under the severe cold atmospheric outdoor environment, and carrying out a cycle test. The bending strength is used as an evaluation index, the acceleration rate of the alpine atmosphere environment-bending fatigue coupling acceleration test is more than 12 times compared with the alpine atmosphere outdoor environment static exposure test, the method can be used for rapidly checking and evaluating the bending performance degradation rule of the plastic in the alpine environment, and the conversion from the static test to the dynamic test of the plastic environment adaptability checking and evaluating is realized.
Description
Technical Field
The invention relates to the technical field of environmental tests, in particular to a plastic high and cold atmospheric environment-bending fatigue cooperative acceleration test method.
Background
Because of excellent performance, the plastic can replace metal as a structural material and is widely applied to the fields of electronics and electrics, transportation, mechanical equipment, daily necessities and the like. In the service process of the alpine atmospheric environment, on one hand, the plastic is subjected to the comprehensive influence of aging of various atmospheric environment factors such as cold and low temperature, solar radiation, humidity and the like, and also subjected to fatigue loads such as bending and stretching, and under the coupling action of the alpine atmospheric environment and mechanical loads, the plastic is frequently damaged and loses efficacy/cracked, so that huge economic loss is caused, and the normal use of equipment/products is influenced.
At the present stage, most of environmental tests are directed at material processes and component samples, static or dynamic natural exposure modes are adopted, or laboratory accelerated tests are used for researching the influence of the environment on the performance and/or the function of the samples, the coupling effect of the atmospheric environment and the mechanical load is less considered, an effective atmospheric environment and mechanical load coupling test method for a plastic bearing structure is lacked, the performance degradation rule and the action mechanism of the plastic under the coupling effect are difficult to fully assess, verify and evaluate, and the development and the application of the plastic on equipment/products are hindered to a certain extent.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a plastic high-cold atmospheric environment-bending fatigue cooperative accelerated test method, which truly reflects the influence of the coupling effect of high-cold atmospheric environment aging and bending fatigue on the performance degradation of plastics, and overcomes the defects that the traditional laboratory accelerated test cannot truly reflect the comprehensive influence of aging of various environmental factors of high-cold atmosphere, and the natural environment static exposure test cannot reflect the influence of bending fatigue.
In order to achieve the purpose, the technical scheme of the invention is as follows: a plastic high and cold atmospheric environment-bending fatigue cooperative acceleration test method comprises the following steps:
s1, standing the test piece in an outdoor environment of high and cold atmosphere for static exposure test, wherein no load except atmospheric pressure is applied to the test piece in the process, and the performance detection period is 3, 6, 9 and 12 months;
s2, placing the test piece in the same atmosphere outdoor environment with the same altitude and cold for alternating cycle test including bending fatigue test and static exposure test, loading the test piece with the stress level of 0.45F-0.8F, the loading frequency of 5Hz and sine wave loading waveform for 25 minutes each day, and performing the static exposure test in the rest time with the test period of 10, 20, 25 and 30 days,
wherein F is the maximum bending force of the test piece material,
the bending strength of the test piece is detected in each period, the bending strength is used as an environmental adaptability evaluation index of the plastic, and the acceleration rate of the alpine atmosphere outdoor environment-bending fatigue loading synergistic test relative to the alpine atmosphere outdoor environment static exposure test is evaluated.
Specifically, the test piece is a sheet structure in a rectangular parallelepiped shape.
Specifically, the plastic is nylon 66.
The invention has the beneficial effects that:
1. the plastic is ensured to be always in the outdoor environment of high and cold atmosphere in the coupling test process, the plastic can simultaneously receive the coupling effect of aging and bending fatigue of various environmental factors such as solar radiation, low temperature and the like, and the coupling test is closer to the actual service working condition of the plastic in the high and cold environment;
2. the method for more truly and rapidly examining and evaluating the bending property of the plastic in the alpine atmosphere environment is provided, the acceleration rate of the alpine atmosphere-bending fatigue coupling acceleration test relative to the alpine atmosphere outdoor environment static exposure test is more than 12 times, the acceleration is remarkable, and the rapid examination and evaluation requirements of the bending property of the plastic in the service process of the alpine atmosphere environment can be met;
3. the method mainly examines the degradation rule of the bending property of the plastic under the coupling action of the high and cold atmospheric environment and the bending fatigue, and overcomes the defect that the traditional laboratory bending fatigue test cannot reflect the comprehensive aging influence of various environmental factors such as solar radiation, low temperature and the like;
4. compared with the traditional natural environment test, the method realizes the transformation of the plastic environment adaptability assessment and evaluation from the static test to the dynamic test, and the test result has higher engineering application value.
Drawings
FIG. 1 is a high and cold climate environment-bending condition load coupling test device;
FIG. 2 is a specification of the length and width dimensions of a test piece;
FIG. 3 is a thickness dimension gauge of the test piece;
FIG. 4 is a graph showing the comparison of the flexural strength of two tests of nylon 66 plastic.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments and the accompanying drawings.
In this example, nylon 66 plastic was used as a test material, and processed into a sheet-like structure having a rectangular parallelepiped shape.
The coupling test device selected in this embodiment is a high and cold climate environment-bending working condition load coupling test device, as shown in fig. 1, and is installed in an outdoor test field of a testing station of a black dragon river having a typical high and cold atmospheric environment.
The test method of the present invention comprises:
the specific conditions of the bending fatigue test under the outdoor environment of the alpine atmosphere are as follows:
load type: bending fatigue;
stress level: 0.45F-0.8F, wherein F is the maximum bending force of the material;
loading frequency: 5 Hz;
loading a waveform: a sine wave;
and (3) test period: 10. 20, 25, 30 days;
the cyclic loading frequency of the tension and compression fatigue load is as follows: loading 1 time per day;
and (3) loading time of each tension and compression fatigue load: for 25 minutes.
And (4) detecting the bending strength of the test piece every period until the test is finished, and taking the bending strength as an environmental suitability evaluation index of the plastic.
Static exposure test in an outdoor environment of alpine atmosphere: after the bending fatigue test under the outdoor environment of the alpine atmosphere, the test piece is subjected to a static exposure test under the outdoor environment of the alpine atmosphere.
Specifically by bending fatigue test under the severe cold atmosphere outdoor environment and the static exposure test under the severe cold atmosphere outdoor environment constitute, bending fatigue test under the severe cold atmosphere outdoor environment and static exposure test under the severe cold atmosphere outdoor environment circulate in turn, and detailed circulation is as follows:
the bending fatigue test under the outdoor environment of the alpine atmosphere is 25 minutes, the static exposure test under the outdoor environment of the alpine atmosphere, the bending fatigue test under the outdoor environment of the alpine atmosphere is 25 minutes, and the static exposure test under the outdoor environment of the alpine atmosphere is … ….
According to the designed test conditions, nylon 66 plastic is used as a test material, a high-cold climate environment-bending working condition load coupling test device is adopted to carry out bending fatigue tests under the outdoor environment of high-cold atmosphere and static exposure tests under the outdoor environment of high-cold atmosphere, the test detection periods are 10 days, 20 days, 25 days and 30 days respectively, and the bending strength of a test piece is detected after each test is finished.
FIG. 3 is a curve of the flexural strength of nylon 66 plastic in the accelerated test of the severe cold environment and the flexural fatigue. The figure shows that the bending strength is reduced to 41 percent in a 30-day high-cold atmospheric environment-bending fatigue cooperative acceleration test; the bending strength is reduced by 26% in a static exposure test under the outdoor environment of the alpine atmosphere for 1 year, and the acceleration rate of the alpine atmosphere-bending fatigue coupling acceleration test is more than 12 times compared with the static exposure test under the outdoor environment of the alpine atmosphere.
The technical solutions provided by the embodiments of the present invention are described in detail above, and the principles and embodiments of the present invention are explained herein by using specific examples, and the descriptions of the embodiments are only used to help understanding the principles of the embodiments of the present invention; meanwhile, for a person skilled in the art, according to the embodiments of the present invention, there may be variations in the specific implementation manners and application ranges, and in summary, the content of the present description should not be construed as a limitation to the present invention.
Claims (3)
1. A plastic high and cold atmospheric environment-bending fatigue cooperative acceleration test method is characterized in that: the method comprises the following steps:
s1, standing the test piece in an outdoor environment of high and cold atmosphere for static exposure test, wherein no load except atmospheric pressure is applied to the test piece in the process, and the performance detection period is 3, 6, 9 and 12 months;
s2, placing the test piece in the same atmosphere outdoor environment with the same altitude and cold for alternating cycle test including bending fatigue test and static exposure test, loading the test piece with the stress level of 0.45F-0.8F, the loading frequency of 5Hz and sine wave loading waveform for 25 minutes each day, and performing the static exposure test in the rest time with the test period of 10, 20, 25 and 30 days,
wherein F is the maximum bending force of the test piece material,
the bending strength of the test piece is detected in each period, the bending strength is used as an environmental adaptability evaluation index of the plastic, and the acceleration rate of the alpine atmosphere outdoor environment-bending fatigue loading synergistic test relative to the alpine atmosphere outdoor environment static exposure test is evaluated.
2. The plastic severe cold atmospheric environment-bending fatigue cooperative acceleration test method according to claim 1, characterized in that: the test piece is of a rectangular sheet structure.
3. The plastic severe cold atmospheric environment-bending fatigue cooperative acceleration test method according to claim 1, characterized in that: the plastic is nylon 66.
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| CN202110705434.1A CN113295548A (en) | 2021-06-24 | 2021-06-24 | Plastic high-cold atmospheric environment-bending fatigue cooperative acceleration test method |
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| CN202110705434.1A CN113295548A (en) | 2021-06-24 | 2021-06-24 | Plastic high-cold atmospheric environment-bending fatigue cooperative acceleration test method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113237776A (en) * | 2021-05-31 | 2021-08-10 | 青岛中和聚氨酯材料有限公司 | Polyurethane high-temperature illumination deformation detection device and detection method thereof |
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| JP2013011564A (en) * | 2011-06-30 | 2013-01-17 | Ihi Corp | Corrosion fatigue test apparatus |
| CN106370532A (en) * | 2016-10-31 | 2017-02-01 | 中国兵器工业第五九研究所 | Pulling, pressing and bending load coupled testing apparatus for outdoor environments of high-cold climates |
| CN111504816A (en) * | 2020-04-02 | 2020-08-07 | 中国兵器工业第五九研究所 | Marine atmospheric environment-tensile load dynamic loading coupling test and evaluation method |
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2021
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Patent Citations (3)
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| JP2013011564A (en) * | 2011-06-30 | 2013-01-17 | Ihi Corp | Corrosion fatigue test apparatus |
| CN106370532A (en) * | 2016-10-31 | 2017-02-01 | 中国兵器工业第五九研究所 | Pulling, pressing and bending load coupled testing apparatus for outdoor environments of high-cold climates |
| CN111504816A (en) * | 2020-04-02 | 2020-08-07 | 中国兵器工业第五九研究所 | Marine atmospheric environment-tensile load dynamic loading coupling test and evaluation method |
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| CN113237776A (en) * | 2021-05-31 | 2021-08-10 | 青岛中和聚氨酯材料有限公司 | Polyurethane high-temperature illumination deformation detection device and detection method thereof |
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Application publication date: 20210824 |