CN108254410B - Spraying layer contact fatigue life prediction method and device based on infrared detection - Google Patents
Spraying layer contact fatigue life prediction method and device based on infrared detection Download PDFInfo
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- CN108254410B CN108254410B CN201711446200.XA CN201711446200A CN108254410B CN 108254410 B CN108254410 B CN 108254410B CN 201711446200 A CN201711446200 A CN 201711446200A CN 108254410 B CN108254410 B CN 108254410B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/72—Investigating presence of flaws
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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Abstract
The invention provides a method and a device for predicting contact fatigue life of a sprayed layer based on infrared detection, wherein the method comprises the following steps: determining factors influencing the contact fatigue life of the spray coating under the combined action of rolling and sliding of the spray coating, combining values of a plurality of factors according to a combination method of n factor 2 level, performing a contact fatigue test of the spray coating according to the values of the plurality of factors in each combination, monitoring the temperature change of each group of spray coatings in the contact fatigue test through a thermal infrared imager, acquiring temperature range, and calculating the average value of the temperature range of the plurality of combinations according to the temperature range of each group; in the prediction of the contact fatigue life of the spraying layer, if the temperature of the spraying layer continuously rises and the real-time temperature range of the spraying layer is larger than the average value of the temperature ranges, the failure of the spraying layer is determined. The invention realizes the method for judging the contact fatigue life failure of the spray coating through the temperature and improves the accuracy of the prediction of the contact fatigue life of the spray coating.
Description
Technical Field
The invention relates to the technical field of spray coating life prediction, in particular to a spray coating contact fatigue life prediction method and device based on infrared detection.
Background
The thermal spraying technology is an important surface treatment technology for repairing shaft, gear and other reproducible rotating parts in reproduction engineering, and the rotating parts are in a rolling, sliding or rolling/sliding motion state under the action of cyclic contact stress in service. With the development of remanufacturing technology, the problem of predicting the service life of the wear-resistant spray coating has become a key and difficult point in remanufacturing engineering.
In the prior art, a multivariate prediction model between the contact fatigue life and the influence factors is established, and the contact fatigue life of a sprayed layer is predicted by adopting the multivariate prediction model, but the influence of a spraying process and the use working condition are increasingly changeable, so that the accuracy of the prediction result according to the multivariate prediction model is reduced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method and a device for predicting the contact fatigue life of a sprayed layer based on infrared detection.
In order to achieve the purpose, the invention provides the following technical scheme:
in one aspect, the invention provides a spray coating contact fatigue life prediction method based on infrared detection, which comprises the following steps:
determining a plurality of factors influencing the contact fatigue life of the spray coating under the combined action of rolling and sliding of the spray coating, and setting a value interval of each factor;
combining values of a plurality of factors according to a combination method of n factor 2 level to obtain a plurality of combinations;
wherein n is the number of factors affecting the contact fatigue life of the sprayed layer;
performing a contact fatigue test on the spray coating according to values of a plurality of factors in each combination, and monitoring the temperature change of each group of spray coatings in the contact fatigue test through a thermal infrared imager;
acquiring the temperature range of the temperature change of the spraying layer in each group, and calculating the average value of the temperature range of a plurality of combinations according to the temperature range of each group;
in the prediction of the contact fatigue life of the spraying layer, if the temperature of the spraying layer continuously rises and the real-time temperature range of the spraying layer is larger than the average value of the temperature ranges, the failure of the spraying layer is determined.
Further, the contact fatigue test of the spray coating according to the values of a plurality of factors in each combination comprises: and controlling values of a plurality of factors in the interaction process of the standard roller and the test roller provided with the spray coating by using a contact fatigue testing machine to complete the contact fatigue test.
Further, the monitoring the temperature change of each group of sprayed layers in the contact fatigue test by the thermal infrared imager comprises the following steps:
and monitoring the surface temperature of a contact point between a standard roller and a test roller provided with the sprayed layer on the contact fatigue testing machine by using a thermal infrared imager during the period from the beginning of the contact fatigue test to the failure of the sprayed layer.
Further, the plurality of factors affecting the contact fatigue life of the sprayed layer include: contact stress, slip ratio, and rotational speed.
Further, the value range of the contact stress is as follows: 0.5-0.7 GPa; the value interval of the slip ratio is as follows: 0% -100%; the value interval of the rotating speed is as follows: 100-600 r.min-1。
On the other hand, the invention also provides a device for predicting the contact fatigue life of the spray coating based on infrared detection, which comprises the following components:
the factor determining module is used for determining a plurality of factors influencing the contact fatigue life of the spray coating under the combined action of rolling and sliding on the spray coating, and setting a value interval of each factor;
the factor combination module is used for combining values of a plurality of factors according to a combination method of n factor 2 level to obtain a plurality of combinations;
wherein n is the number of factors affecting the contact fatigue life of the sprayed layer;
the fatigue test module is used for carrying out a contact fatigue test on the spray coating according to values of a plurality of factors in each combination and monitoring the temperature change of each group of spray coatings in the contact fatigue test through the thermal infrared imager;
the range calculation module is used for acquiring the temperature range of the temperature change of the spraying layer in each group and calculating the average value of the temperature ranges of the multiple combinations according to the temperature range of each group;
and the prediction module is used for determining that the spraying layer fails if the temperature of the spraying layer continuously rises and the real-time temperature range of the spraying layer is greater than the average value of the temperature ranges in the prediction of the contact fatigue life of the spraying layer.
Further, the fatigue test module comprises:
and the testing unit is used for controlling values of a plurality of factors in the interaction process of the standard roller and the testing roller provided with the spraying layer by adopting a contact fatigue testing machine to complete a contact fatigue test.
Further, the fatigue test module further includes:
and the monitoring unit is used for monitoring the surface temperature of a contact point between the standard roller and the testing roller provided with the sprayed layer on the contact fatigue testing machine by adopting a thermal infrared imager during the period from the beginning of the contact fatigue test to the failure of the sprayed layer.
Further, the plurality of factors affecting the contact fatigue life of the sprayed layer include: contact stress, slip ratio, and rotational speed.
Further, the value range of the contact stress is as follows: 0.5-0.7 GPa;
the value interval of the slip ratio is as follows: 0% -100%;
the value interval of the rotating speed is as follows: 100-600 r.min-1。
According to the technical scheme, the method and the device for predicting the contact fatigue life of the spraying layer based on the infrared detection monitor the contact fatigue failure process of the spraying layer in real time through the thermal infrared imager, obtain the surface temperature change state of the spraying layer, and predict the contact fatigue failure of the spraying layer according to the catastrophe points of the surface temperature of the spraying layer. The method for judging the contact fatigue life failure of the spray coating through the temperature is realized, and the accuracy of prediction of the contact fatigue life of the spray coating is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for predicting contact fatigue life of a sprayed layer based on infrared detection according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of each test point in a method for predicting contact fatigue life of a sprayed layer based on infrared detection according to an embodiment of the present invention;
FIG. 3 is a schematic contact diagram of a test roller and a standard roller in a method for predicting contact fatigue life of a sprayed layer based on infrared detection according to an embodiment of the present invention;
FIG. 4 is a cross-sectional view of a test roller and a standard roller in a method for predicting contact fatigue life of a sprayed layer based on infrared detection according to an embodiment of the invention;
FIG. 5 is a schematic diagram of infrared thermographic monitoring of contact fatigue of a coating layer in a method for predicting contact fatigue life of a spray coating based on infrared detection according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a change in temperature of a surface of a sprayed layer in a method for predicting contact fatigue life of the sprayed layer based on infrared detection according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a device for predicting contact fatigue life of a sprayed layer based on infrared detection according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The following embodiment of the invention provides a spray coating contact fatigue life prediction method based on infrared detection, and with reference to fig. 1, the method specifically comprises the following steps:
s101: determining a plurality of factors influencing the contact fatigue life of the spray coating under the combined action of rolling and sliding of the spray coating, and setting a value interval of each factor;
in this step, the contact fatigue life of the sprayed layer is affected by a plurality of factors, such as the contact stress, slip ratio, rotation speed and other service conditions, and also the bonding strength between the sprayed layer and the substrate, the microhardness of the sprayed layer, the thickness of the sprayed layer and other quality and surface performance parameters. By spraying the coating with the same performance parameters, the main factor influencing the contact fatigue life of the sprayed coating is the service condition. Thus, several factors that influence the contact fatigue life of the sprayed layer in this step include: contact stress, slip ratio, and rotational speed.
S102: combining values of a plurality of factors according to a combination method of n factor 2 level to obtain a plurality of combinations;
wherein n is the number of factors affecting the contact fatigue life of the sprayed layer;
in this step, according to the above step S101, 3 factors affecting the contact fatigue life of the spray coating are determined, that is, n is 3, and a combination method of 3 factors and 2 levels is adopted to combine the values of the factors.
Based on the design of a 3-factor 2 level factor, namely 23The statistical experiment method is formed by adopting a central composite design and adding a central experiment point and an axis experiment point. Referring to fig. 2, the total number of test points N ═ mc+mr+m0That is, N sets of experiments were performed. Wherein m iscIs 2nThe number of factor design test points, m is 3 because the number of factor n c8, 8 test points numbered 1-8 in FIG. 2, m r6 test points, m, numbered 9-14 in FIG. 2, for the number of test points distributed on n coordinate axes0The number of repetitions of the test point numbered 15 in fig. 2 is the number of repetitions of the center point. The distance from the axis test point to the central point is an undetermined parameter r, and the orthogonality, the rotation and the like can be adjusted by adjusting r, generally speaking, if the better rotation is required, r is required4＝mc. In this example, the number of times the experiment was repeated at the center point was 5 times, and r was 1.68. See tables 1 and 2, where table 1 is the central composite design test protocol and table 2 is a table of values taken for the three factors in the central composite design test protocol. Wherein, the test points numbered 1-8 in FIG. 2 correspond to the test numbers 1-8 in the following Table 1; the axis test points numbered 9-14 in FIG. 2 correspond to the test numbers 9-14 in Table 1 below; the centre point numbered 15 in figure 2 corresponds to the test numbers numbered 15-19 in table 1 below, i.e. the centre point requires 5 replicates. Setting the connecting line of the test point 9 and the test point 10 as an x axis, and corresponding to the 1 st factor; the connecting line of the test point 11 and the test point 12 is a y-axis and corresponds to the 2 nd factor; test points 13 and 14 are the z-axis, corresponding to factor 3; with test point 15 as the origin of coordinates. If the side length of the cube is 2, for example, the coordinate value of the test point 1 is (1,1,1), the combination of the three factors corresponding to the test point 1 is: the first factor takes a value corresponding to 1, the second factor takes a value corresponding to 1, and the third factor takes a value corresponding to 1. The combination of the three factors for test point 10 is: the first factor takes a value of 1.68, the second factor takes a value of 0, the third factor takes a value of 0, and the meaning of other test points can be analogized with reference to the test points 1 and 10, which are not explained herein.
TABLE 1 Central composite design experiment scheme
TABLE 2 table of values of three factors in the center composite design test scheme
Tables 1 and 2 are values for the combination of the test with contact stress, slip ratio and rotational speed as three factors, and three factors.
S103: performing a contact fatigue test on the spray coating according to values of a plurality of factors in each combination, and monitoring the temperature change of each group of spray coatings in the contact fatigue test through a thermal infrared imager;
in the step, a contact fatigue testing machine is adopted to control values of a plurality of factors in the interaction process of the standard roller and the testing roller provided with the spray coating, and the contact fatigue test is completed. For example, a contact fatigue test is carried out by using an RM-1 type multifunctional testing machine, and the real contact state of the sprayed layer under the combined action of rolling and sliding motion states is simulated by setting the values of factors such as slip ratio, contact stress, rotating speed and the like. Referring to fig. 3, a standard roller 32 and a test roller 31 provided with a sprayed layer are used to simulate the real contact state of the sprayed layer under the combined action of sliding and rolling, wherein the linear contact length of the test roller 31 and the standard roller 32 can be 8mm, the peripheral edge chamfer can be 0.5mm, and the standard roller 32 can be 45# high quality carbon steel after quenching and tempering, and fig. 4 is a sectional view of the test roller 31 and the standard roller 32. Meanwhile, during the period from the beginning of the contact fatigue test to the failure of the sprayed layer, the surface temperature of a contact point between a standard roller and a test roller provided with the sprayed layer on the contact fatigue testing machine is monitored by adopting a thermal infrared imager. For example, referring to fig. 5, NEC R300 infrared thermal imager was used for online monitoring during contact fatigue failure. The roller coated with AT40 coating was used as a test roller to perform contact fatigue test with the test rollerThe standard roller of (2) is 45# high-quality carbon steel. A contact fatigue test of a contact fatigue life experimental scheme under the influence of contact stress, slip ratio and rotating speed 3 factors is carried out by adopting a central composite design experimental method, and the experimental scheme is shown in Table 1. In order to ensure the safety and the performability of the experiment, the value range of the slip ratio is set to be 0-100%, and the value range of the rotating speed is set to be 100--1The value range of the contact stress is 0.5-0.7 GPa.
The contact fatigue test is performed according to the values of the factors in the above table 2, and the test results of the following table 3 can be obtained:
TABLE 3 test results Table
Table 3 shows the pair No. 1#To No. 5#The results of the examination of contact fatigue life of 5 sprayed layers.
S104: acquiring the temperature range of the temperature change of the spraying layer in each group, and calculating the average value of the temperature range of a plurality of combinations according to the temperature range of each group;
in this step, the temperature range of the temperature in each group is calculated according to the temperature change of the sprayed layer in the group, and the temperature range is the difference between the maximum temperature value and the minimum temperature value in the group. The temperature range of each of the remaining 18 groups was calculated in the manner described above, and the average of the temperature ranges of the 19 groups was obtained. And (4) limiting the lower single-side confidence limit of the extremely poor average temperature value to be a threshold value, wherein the threshold value is used for judging whether the sprayed layer is in a failure condition.
S105: in the prediction of the contact fatigue life of the spraying layer, if the temperature of the spraying layer continuously rises and the real-time temperature range of the spraying layer is larger than the average value of the temperature ranges, the failure of the spraying layer is determined.
In the step, in the whole process of contact fatigue failure of the spray coating, the temperature of the spray coating shows a trend of increasing, decreasing, staggering, fluctuating and rising along with the extension of time, and a plurality of temperature sudden increasing points are accompanied in the period; when the sprayed layer is in the failure stage, the temperature of the sprayed layer is always in the rising stage, and the temperature of the sprayed layer does not tend to decrease. Referring to fig. 6, when the test was run to 350s, the temperature of the sprayed layer showed a significant sudden increase, as indicated by the arrow, at which point the sprayed layer failed to break.
In the prediction of the contact fatigue life of the spray coating, the temperature of a contact point between the spray coating to be predicted and a standard roller is detected, and when the temperature of the contact point continuously rises and does not have a descending trend, and the real-time temperature range of the spray coating is larger than a threshold value, the failure of the spray coating is determined.
From the above description, the thermal infrared imager is used for monitoring the contact fatigue failure process of the spray coating layer in real time, the temperature change state of the surface of the spray coating layer is obtained, and the contact fatigue failure of the spray coating layer is predicted according to the abrupt change point of the surface temperature of the spray coating layer. The method for judging the contact fatigue life failure of the spray coating through the temperature is realized, and the accuracy of prediction of the contact fatigue life of the spray coating is improved.
In an alternative embodiment, there is provided embodiment 1 above#Spray coating to 5#The preparation method of the spray coating comprises the following specific steps:
the contact fatigue life of the coating is influenced by a plurality of factors, such as service conditions of contact stress, slip ratio, rotating speed and the like, and quality and surface performance parameters of the coating, such as the bonding strength of the coating and a substrate, the microhardness of the coating, the thickness of the coating and the like. Wherein, the bonding strength between the coating and the substrate, the microhardness of the coating and the thickness of the coating which influence the service life of the coating are related to the preparation of the coating. The bonding strength of the coating and the substrate and the microhardness of the coating are mainly influenced by the Ar gas flow, the spraying power and the spraying distance in the preparation process. The thickness of the coating can be first of all applied by spraying the coating with the same thickness and then post-treating it by means of grinding with a grinding wheel, which also reduces the roughness of the surface of the coating. In order to prepare coatings with different quality surface performance parameters and to investigate the regularity of contact fatigue failure of the coatings, a uniform design preparation scheme with 4 factors and 5 levels is adopted, and the factors are Ar gas flow, spraying power, spraying distance and coating thickness.
Adopting high-efficiency supersonic plasma spraying equipment (HEJET) to spray and harden the peripheral surface of the 45# steel test rollerAnd (4) preparing a coating. Before spraying, the surface of the substrate is subjected to sand blasting treatment by adopting brown corundum. The Ni/Al alloy with the mass fraction of 90% of Ni and 10% of Al is used as a bonding layer to improve the bonding strength of the coating and the substrate. By using Al2O3-40wt％TiO2The coating layer is used as a spray coating layer. The substrate is a roller with a line contact length of 8mm and a peripheral edge chamfer angle of 0.5 mm. The same spraying time and spraying times are adopted, so that the coating and the matrix are influenced by the same thermodynamic factors such as cooling time, heating state and the like, and the thickness of the coating after spraying is 500-600 mu m. Coatings with different quality surface performance parameters were obtained by varying the spray parameters as shown in table 4. The test pieces were bonded with E7 high strength glue and baked in a drying oven at 1000C for 4 hours, and the bonding strength was tested using a UTM 5504 tester according to GB/T8642-2002 standard. Microhardness was measured using a Micromet-6030 automatic microhardness tester. Coatings of different thicknesses were obtained by grinding with a grinding wheel, and the coating thickness, bond strength and microhardness are shown in table 4.
TABLE 4 coating spray parameters and quality and surface Property parameters
The embodiment of the invention provides a device for predicting contact fatigue life of a spray coating based on infrared detection, and referring to fig. 7, the device specifically comprises:
the factor determining module 10 is configured to determine a plurality of factors that affect the contact fatigue life of the spray coating under the combined action of rolling and sliding of the spray coating, and set a value range of each factor;
the factor combination module 20 is used for combining values of a plurality of factors according to a combination method of n factor 2 levels to obtain a plurality of combinations;
wherein n is the number of factors affecting the contact fatigue life of the sprayed layer;
the fatigue test module 30 is used for performing a contact fatigue test on the spray coating according to values of a plurality of factors in each combination, and monitoring the temperature change of each group of spray coatings in the contact fatigue test through a thermal infrared imager;
the range calculation module 40 is used for acquiring the temperature range of the temperature change of the spray coating in each group, and calculating the average value of the temperature ranges of a plurality of combinations according to the temperature range of each group;
and the prediction module 50 is configured to determine that the sprayed layer fails if the temperature of the sprayed layer continuously rises and the real-time temperature range of the sprayed layer is greater than the average temperature range in the sprayed layer contact fatigue life prediction.
The fatigue testing module 30 includes:
and the testing unit is used for controlling values of a plurality of factors in the interaction process of the standard roller and the testing roller provided with the spraying layer by adopting a contact fatigue testing machine to complete a contact fatigue test.
The fatigue testing module 30 further includes:
and the monitoring unit is used for monitoring the surface temperature of a contact point between the standard roller and the testing roller provided with the sprayed layer on the contact fatigue testing machine by adopting a thermal infrared imager during the period from the beginning of the contact fatigue test to the failure of the sprayed layer.
The factors that affect the contact fatigue life of the sprayed layer include: contact stress, slip ratio, and rotational speed. The value interval of the contact stress is as follows: 0.5-0.7 GPa; the value interval of the slip ratio is as follows: 0% -100%; the value interval of the rotating speed is as follows: 100-600 r.min-1。
As for the apparatus embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
According to the technical scheme, the thermal infrared imager is used for monitoring the contact fatigue failure process of the spraying layer in real time, the temperature change state of the surface of the spraying layer is obtained, and the contact fatigue failure of the spraying layer is predicted according to the abrupt change point of the surface temperature of the spraying layer. The method for judging the contact fatigue life failure of the spray coating through the temperature is realized, and the accuracy of prediction of the contact fatigue life of the spray coating is improved.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention is not limited to any single aspect, nor is it limited to any single embodiment, nor is it limited to any combination and/or permutation of these aspects and/or embodiments. Moreover, each aspect and/or embodiment of the present invention may be utilized alone or in combination with one or more other aspects and/or embodiments thereof.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (10)
1. A spray coating contact fatigue life prediction method based on infrared detection is characterized by comprising the following steps:
determining a plurality of factors influencing the contact fatigue life of the spray coating under the combined action of rolling and sliding of the spray coating, and setting a value interval of each factor;
combining values of a plurality of factors according to a combination method of n factor 2 level to obtain a plurality of combinations;
wherein n is the number of factors affecting the contact fatigue life of the sprayed layer;
performing a contact fatigue test on the spray coating according to values of a plurality of factors in each combination, and monitoring the temperature change of each group of spray coatings in the contact fatigue test through a thermal infrared imager;
acquiring the temperature range of the temperature change of the spraying layer in each group, and calculating the average value of the temperature range of a plurality of combinations according to the temperature range of each group;
in the prediction of the contact fatigue life of the spraying layer, if the temperature of the spraying layer continuously rises and the real-time temperature range of the spraying layer is larger than the average value of the temperature ranges, the failure of the spraying layer is determined.
2. The method for predicting contact fatigue life of the spray coating according to claim 1, wherein the contact fatigue test of the spray coating according to values of a plurality of factors in each combination comprises: and controlling values of a plurality of factors in the interaction process of the standard roller and the test roller provided with the spray coating by using a contact fatigue testing machine to complete the contact fatigue test.
3. The sprayed layer contact fatigue life prediction method of claim 1, wherein the monitoring of the temperature change of each group of sprayed layers in the contact fatigue test by a thermal infrared imager comprises:
and monitoring the surface temperature of a contact point between a standard roller and a test roller provided with the sprayed layer on the contact fatigue testing machine by using a thermal infrared imager during the period from the beginning of the contact fatigue test to the failure of the sprayed layer.
4. The method of predicting contact fatigue life of a sprayed layer according to claim 1, wherein the plurality of factors affecting contact fatigue life of the sprayed layer include: contact stress, slip ratio, and rotational speed.
5. The method for predicting the contact fatigue life of the sprayed layer according to claim 4, wherein the value interval of the contact stress is as follows: 0.5-0.7 GPa; the value interval of the slip ratio is as follows: 0% -100%; the value interval of the rotating speed is as follows: 100-600 r.min-1。
6. An infrared detection-based spray coating contact fatigue life prediction device, comprising:
the factor determining module is used for determining a plurality of factors influencing the contact fatigue life of the spray coating under the combined action of rolling and sliding on the spray coating, and setting a value interval of each factor;
the factor combination module is used for combining values of a plurality of factors according to a combination method of n factor 2 level to obtain a plurality of combinations;
wherein n is the number of factors affecting the contact fatigue life of the sprayed layer;
the fatigue test module is used for carrying out a contact fatigue test on the spray coating according to values of a plurality of factors in each combination and monitoring the temperature change of each group of spray coatings in the contact fatigue test through the thermal infrared imager;
the range calculation module is used for acquiring the temperature range of the temperature change of the spraying layer in each group and calculating the average value of the temperature ranges of the multiple combinations according to the temperature range of each group;
and the prediction module is used for determining that the spraying layer fails if the temperature of the spraying layer continuously rises and the real-time temperature range of the spraying layer is greater than the average value of the temperature ranges in the prediction of the contact fatigue life of the spraying layer.
7. The sprayed layer contact fatigue life prediction apparatus of claim 6, wherein the fatigue test module comprises:
and the testing unit is used for controlling values of a plurality of factors in the interaction process of the standard roller and the testing roller provided with the spraying layer by adopting a contact fatigue testing machine to complete a contact fatigue test.
8. The sprayed layer contact fatigue life prediction apparatus of claim 6, wherein the fatigue test module further comprises:
and the monitoring unit is used for monitoring the surface temperature of a contact point between the standard roller and the testing roller provided with the sprayed layer on the contact fatigue testing machine by adopting a thermal infrared imager during the period from the beginning of the contact fatigue test to the failure of the sprayed layer.
9. The sprayed layer contact fatigue life prediction apparatus of claim 6, wherein the plurality of factors that affect the contact fatigue life of the sprayed layer comprise: contact stress, slip ratio, and rotational speed.
10. The sprayed layer contact fatigue life predicting apparatus according to claim 9,
the value interval of the contact stress is as follows: 0.5-0.7 GPa;
the value interval of the slip ratio is as follows: 0% -100%;
the value interval of the rotating speed is as follows: 100-600 r.min-1。
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