CN112504834A - Stiffness testing method for automatic fiber-laying carbon fiber prepreg tows - Google Patents

Stiffness testing method for automatic fiber-laying carbon fiber prepreg tows Download PDF

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CN112504834A
CN112504834A CN202011003419.4A CN202011003419A CN112504834A CN 112504834 A CN112504834 A CN 112504834A CN 202011003419 A CN202011003419 A CN 202011003419A CN 112504834 A CN112504834 A CN 112504834A
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carbon fiber
laying
test
tows
automatic
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龚家谦
何凯
程勇
崔博
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Chengdu Aircraft Industrial Group Co Ltd
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Chengdu Aircraft Industrial Group Co Ltd
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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
    • 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
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/026—Specifications of the specimen
    • G01N2203/0298—Manufacturing or preparing specimens
    • 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
    • G01N2203/06—Indicating or recording means; Sensing means
    • G01N2203/067—Parameter measured for estimating the property
    • G01N2203/0682—Spatial dimension, e.g. length, area, angle

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
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  • General Health & Medical Sciences (AREA)
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  • Pathology (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

The invention discloses a stiffness testing method for an automatic fiber-laying carbon fiber prepreg tow, belonging to the technical field of automatic laying and forming of prepregs, and being characterized by comprising the following steps of: a. cutting the carbon fiber pre-impregnated tows for automatic fiber laying, and standing for 8-10h in a standard temperature and humidity test environment; b. one end of the carbon fiber pre-impregnated tows for automatic fiber laying is vertically fixed by a clamp, and the other end is hung with a load of 100 and 150 g; c. taking down the carbon fiber pre-impregnated tows for automatic fiber laying, cutting out the test sample, measuring and recording the extending length L0(ii) a d. Measuring and recording the horizontal length L of the test end specimen in the horizontal direction1(ii) a e. Calculating the stiffness S of the test specimenAFP. The method can characterize the stiffness of the carbon fiber pre-impregnated tows for the whole automatic fiber laying, and further performs fiber layingTest data are provided by the track planning and the modification of the carbon fiber pre-impregnated tow process for automatic fiber laying.

Description

Stiffness testing method for automatic fiber-laying carbon fiber prepreg tows
Technical Field
The invention relates to the technical field of automatic laying and forming of prepreg, in particular to a stiffness testing method for an automatic filament-laying carbon fiber prepreg tow.
Background
The automatic fiber laying process comprises the steps of conveying a plurality of or dozens of prepreg tows from respective reels to a fiber laying head through a tension adjusting system and a conveying system, wherein the fiber laying head lays the prepreg tows on the surface of a mold or on a layer under the action of a compaction mechanism after heating and softening the prepreg tows according to a fiber laying track generated by the layer design requirement, and the number of the laid prepreg tows can be increased or decreased in real time according to actual needs. Laydown refers to the ability of the prepreg tows to not distort during laydown. The deformable range of the prepreg tows is small, and the prepreg tows can only follow a specific track when laying a complex curved surface, otherwise the prepreg tows can cause wrinkles or tears, and the laying quality of the component is affected. Therefore, the stiffness of the prepreg tows needs to be characterized, and test data are provided for laying track planning and prepreg tow process modification.
Chinese patent document CN 109580477A, published as 2019, 04 and 05 discloses a method for detecting splicing strength of prepreg for automatic placement, which is characterized in that,
1) preparation of a flat pull sample: horizontally placing two prepreg tows, vertically overlapping the left end of one prepreg tow and the right end of the other prepreg tow for a certain length for pre-bonding, wherein the direction of a main shaft of a bonding area of the two prepreg tows is the same as the direction of carbon fibers in the prepreg tows, then placing the bonding area into a mechanical hot-pressing platform for hot-pressing and splicing, the prepreg tows and the hot-pressing platform are isolated by adopting a demolding material, and the temperature, the pressure and the time for hot-splicing prepreg tow samples are consistent with the technological parameters adopted for splicing the prepreg tows used in the actual production process;
2) preparation of a stripping sample: aligning two ends of two prepreg tows with the same length, pre-bonding an overlapped area at one end of the two prepreg tows, wherein the direction of a main shaft of the bonded area of the prepreg tows is the same as the direction of carbon fibers in the prepreg tows, then placing the bonded area into a mechanical hot-pressing platform for hot-pressing splicing, isolating the prepreg tows and the hot-pressing platform by adopting a demolding material, and enabling the temperature, the pressure and the time of the hot-pressing splicing to be consistent with the technological parameters adopted by splicing the overlong prepreg tows;
3) and (3) performance testing: and (2) testing the splicing strength test samples obtained in the steps 1) and 2) by using a tension tester and a peeling strength tester respectively, wherein the test environment temperature is consistent with the practical application environment temperature of the prepreg, the load loading rate is consistent with the practical laying rate of the prepreg, and the flat tensile failure strength and the peeling failure strength of the prepreg tow sample obtained through the test are used as the prepreg splicing strength quantification characterization result.
According to the method for detecting the splicing strength of the prepreg for automatic laying, disclosed by the patent document, by analyzing the stress condition in the practical application of the prepreg strand splicing head, the horizontal pulling failure strength of the splicing part is measured by using a tensile tester, the peeling failure strength of the splicing part is measured by using a peeling tester, and the obtained two strength parameters are respectively used as the splicing strength of the prepreg in a straight state and a bending state. The strength of the prepreg tow splicing head in the practical application process can be reflected through the quantitative characterization results of two different angles. However, the stiffness of the whole prepreg tows cannot be characterized, and test data cannot be provided for laying trajectory planning and prepreg tow process modification.
Disclosure of Invention
The stiffness of the whole carbon fiber prepreg tows for automatic fiber laying can be characterized, and test data are provided for laying track planning and process modification of the carbon fiber prepreg tows for automatic fiber laying.
The invention is realized by the following technical scheme:
a stiffness testing method for an automatic fiber-laying carbon fiber prepreg tow is characterized by comprising the following steps:
a. cutting the carbon fiber pre-impregnated tows with the lengths of 300 and 320mm for automatic fiber laying, and placing the carbon fiber pre-impregnated tows in a standard temperature and humidity test environment for standing for 8-10 hours;
b. vertically fixing one end of the carbon fiber pre-impregnated tows for automatic fiber laying by using a clamp in the test environment of the step a, hanging a load of 100-150g at the other end of the carbon fiber pre-impregnated tows for suspension, and standing for 30-50min for correcting the bending, twisting and wrinkling of the carbon fiber pre-impregnated tows for automatic fiber laying;
c. unloading the load, taking down the carbon fiber pre-impregnated tows for automatic fiber laying, cutting the carbon fiber pre-impregnated tows to 250mm in length to serve as a test sample, placing one end of the test sample 50mm long on a horizontal test table for fixing, extending the other end of the test sample 200mm long out of the horizontal test table, and measuring and recording the extending length L0；
d. Naturally sagging the test sample under the action of gravity, standing for 5-10min, measuring and recording the horizontal length L of the test sample in the horizontal direction after the test is finished1；
e. Calculating the stiffness S of the test specimenAFP，SAFPValues closer to 1 are indicative of stiffer test specimens, and conversely softer.
In the step a, when the carbon fiber pre-impregnated tows for automatic fiber laying are cut, ports at two ends are kept straight, and when the length of the carbon fiber pre-impregnated tows for automatic fiber laying is measured, the carbon fiber pre-impregnated tows for automatic fiber laying are kept straight, wherein the standard temperature and humidity test environment refers to that the temperature is 18-26 ℃ and the humidity is 30-65%.
In the step c, the test sample is specifically carbon fiber pre-impregnated tows for automatic fiber laying, which are free from bending, twisting and wrinkling and have the length of 250 mm.
In the step c, one end of the test sample with the length of 50mm is placed on the horizontal test table for fixing, specifically, a weight of 2-5KG is adopted to press the test sample on the horizontal test table.
In the step c, the step of enabling the other end of the test sample to be 200mm long to extend out of the horizontal test table specifically means that the test sample with the length of 200mm is kept parallel to the horizontal test table and extends out of the horizontal test table.
In the step d, the horizontal length L of the test end sample in the horizontal direction is measured and recorded1In particular, the method uses and measures L0The same reference point or two reference points are measured on the same vertical reference plane.
In the step e, the stiffness S of the test sample is testedAFPIs calculated by the formula SAFP＝L1/L0。
The invention has the beneficial effects that:
1. in the invention, a carbon fiber pre-impregnated tow for automatic fiber laying with cutting length of 300-; b. vertically fixing one end of the carbon fiber pre-impregnated tows for automatic fiber laying by using a clamp in the test environment of the step a, hanging a load of 100-150g at the other end of the carbon fiber pre-impregnated tows for suspension, and standing for 30-50min for correcting the bending, twisting and wrinkling of the carbon fiber pre-impregnated tows for automatic fiber laying; c. unloading the load, taking down the carbon fiber pre-impregnated tows for automatic fiber laying, cutting the carbon fiber pre-impregnated tows to 250mm in length to serve as a test sample, placing one end of the test sample 50mm long on a horizontal test table for fixing, extending the other end of the test sample 200mm long out of the horizontal test table, and measuring and recording the extending length L0(ii) a d. Naturally sagging the test sample under the action of gravity, standing for 5-10min, measuring and recording the horizontal length L of the test sample in the horizontal direction after the test is finished1(ii) a e. Calculating the stiffness S of the test specimenAFP，SAFPThe value is closer to 1, the more rigid the test sample is represented, and the softer the test sample is, through the steps a-e, the stiffness of the whole carbon fiber pre-impregnated tow for automatic fiber laying can be represented, and test data are further provided for laying track planning and modification of the carbon fiber pre-impregnated tow for automatic fiber laying.
2. According to the method, in the step a, when the carbon fiber pre-impregnated tows for automatic fiber laying are cut, the ports at two ends are kept straight, when the length of the carbon fiber pre-impregnated tows for automatic fiber laying is measured, the carbon fiber pre-impregnated tows for automatic fiber laying are kept straight, the standard temperature and humidity test environment means that the temperature is 18-26 ℃ and the humidity is 30-65%, the test accuracy can be guaranteed, and the accuracy of the stiffness value of a test sample is further guaranteed through subsequent calculation.
3. In the step c, the test sample is the carbon fiber pre-impregnated tows for automatic fiber laying, which are free from bending, twisting and wrinkling and have the length of 250mm, so that the test accuracy can be further ensured.
4. In step d, the horizontal length L of the test sample in the horizontal direction is measured and recorded1In particular, the method uses and measures L0The same reference point orThe two reference points are measured on the same vertical reference surface, and the measurement is carried out on the same reference point or the same vertical reference surface, so that the stiffness value of the test sample obtained by subsequent calculation is more objective and real, and the method is favorable for providing test data for laying trajectory planning and modification of the carbon fiber pre-impregnated tow for automatic laying.
Drawings
The invention will be further described in detail with reference to the drawings and the detailed description, wherein:
FIG. 1 is a schematic view of the correction of the hanging of the carbon fiber prepreg tows for automatic fiber placement according to the present invention;
FIG. 2 is a schematic view of a test specimen according to the present invention;
the labels in the figure are: 1. the method comprises the steps of automatically laying carbon fiber pre-impregnated tows for silk, 2, a clamp, 3, a load, 4, a test sample, 5, a horizontal test table, 6, a test finishing sample, 7 and a heavy object.
Detailed Description
Example 1
Referring to fig. 1 and 2, a stiffness test method for an automatic fiber-laying carbon fiber prepreg tow includes the following steps:
a. cutting a carbon fiber pre-impregnated tow 1 with the length of 300mm for automatic fiber laying, and placing the carbon fiber pre-impregnated tow in a standard temperature and humidity test environment for standing for 8 hours;
b. vertically fixing one end of the carbon fiber pre-impregnated tows 1 for automatic fiber laying by using a clamp 2 in the test environment of the step a, hanging 100g of load 3 at the other end of the carbon fiber pre-impregnated tows for automatic fiber laying, and standing for 30min for correcting bending, twisting and wrinkling of the carbon fiber pre-impregnated tows 1 for automatic fiber laying;
c. unloading the load 3, taking down the carbon fiber pre-impregnated tows 1 for automatic fiber laying, cutting the carbon fiber pre-impregnated tows to a length of 250mm to obtain a test sample 4, placing one end of the test sample 4 with a length of 50mm on a horizontal test table 5 for fixing, extending the other end of the test sample 4 with a length of 200mm out of the horizontal test table 5, measuring and recording the extending length L0；
d. The test sample 4 naturally sags under the action of gravity, stands for 5min, and the horizontal length L of the test sample 6 in the horizontal direction is measured and recorded1；
e. Calculate the stiffness S of the test specimen 4AFP，SAFPValues closer to 1 indicate that the test specimen 4 is stiffer and conversely softer.
Example 2
Referring to fig. 1 and 2, a stiffness test method for an automatic fiber-laying carbon fiber prepreg tow includes the following steps:
a. cutting a carbon fiber pre-impregnated tow 1 with the length of 305mm for automatic fiber laying, and placing the carbon fiber pre-impregnated tow in a standard temperature and humidity test environment for standing for 9 hours;
b. vertically fixing one end of the carbon fiber pre-impregnated tows 1 for automatic fiber laying by using a clamp 2 in the test environment of the step a, hanging 120g of load 3 at the other end of the carbon fiber pre-impregnated tows for automatic fiber laying, and standing for 35min for correcting bending, twisting and wrinkling of the carbon fiber pre-impregnated tows 1 for automatic fiber laying;
c. unloading the load 3, taking down the carbon fiber pre-impregnated tows 1 for automatic fiber laying, cutting the carbon fiber pre-impregnated tows to a length of 250mm to obtain a test sample 4, placing one end of the test sample 4 with a length of 50mm on a horizontal test table 5 for fixing, extending the other end of the test sample 4 with a length of 200mm out of the horizontal test table 5, measuring and recording the extending length L0；
d. The test sample 4 naturally sags under the action of gravity, stands for 7min, and the horizontal length L of the test sample 6 in the horizontal direction is measured and recorded1；
e. Calculate the stiffness S of the test specimen 4AFP，SAFPValues closer to 1 indicate that the test specimen 4 is stiffer and conversely softer.
In the step a, when the carbon fiber pre-impregnated tows 1 for automatic fiber laying are cut, ports at two ends are kept straight, and when the length of the carbon fiber pre-impregnated tows 1 for automatic fiber laying is measured, the carbon fiber pre-impregnated tows 1 for automatic fiber laying are kept straight, wherein the standard temperature and humidity test environment refers to that the temperature is 18 ℃ and the humidity is 30%.
In the step c, the test sample 4 specifically refers to the carbon fiber prepreg tows 1 for automatic fiber laying, which have no bending, twisting and wrinkling and are 250mm in length.
Example 3
Referring to fig. 1 and 2, a stiffness test method for an automatic fiber-laying carbon fiber prepreg tow includes the following steps:
a. cutting a carbon fiber pre-impregnated tow 1 for automatic fiber laying with the length of 315mm, and placing the carbon fiber pre-impregnated tow in a standard temperature and humidity test environment for standing for 10 hours;
b. vertically fixing one end of the carbon fiber pre-impregnated tows 1 for automatic fiber laying by using a clamp 2 in the test environment of the step a, hanging a load 3 of 140g at the other end of the carbon fiber pre-impregnated tows for automatic fiber laying for hanging, and standing for 40min for correcting bending, twisting and wrinkling of the carbon fiber pre-impregnated tows 1 for automatic fiber laying;
c. unloading the load 3, taking down the carbon fiber pre-impregnated tows 1 for automatic fiber laying, cutting the carbon fiber pre-impregnated tows to a length of 250mm to obtain a test sample 4, placing one end of the test sample 4 with a length of 50mm on a horizontal test table 5 for fixing, extending the other end of the test sample 4 with a length of 200mm out of the horizontal test table 5, measuring and recording the extending length L0；
d. The test sample 4 naturally sags under the action of gravity, stands for 9min, and the horizontal length L of the test sample 6 in the horizontal direction is measured and recorded1；
e. Calculate the stiffness S of the test specimen 4AFP，SAFPValues closer to 1 indicate that the test specimen 4 is stiffer and conversely softer.
In the step a, when the carbon fiber pre-impregnated tows 1 for automatic fiber laying are cut, ports at two ends are kept straight, and when the length of the carbon fiber pre-impregnated tows 1 for automatic fiber laying is measured, the carbon fiber pre-impregnated tows 1 for automatic fiber laying are kept straight, wherein the standard temperature and humidity test environment refers to that the temperature is 22 ℃ and the humidity is 45%.
In the step c, the test sample 4 specifically refers to the carbon fiber prepreg tows 1 for automatic fiber laying, which have no bending, twisting and wrinkling and are 250mm in length.
In the step c, one end 50mm long of the test sample 4 is placed on the horizontal test table 5 for fixing, specifically, the test sample 4 is pressed on the horizontal test table 5 by a weight 7 of 2 KG.
In the step c, the other end of the test sample 4 with the length of 200mm extending out of the horizontal test table 5 specifically means that the test sample 4 with the length of 200mm is kept parallel to the horizontal test table 5 and extends out of the horizontal test table 5.
Example 4
Referring to fig. 1 and 2, a stiffness test method for an automatic fiber-laying carbon fiber prepreg tow includes the following steps:
a. cutting a carbon fiber pre-impregnated tow 1 with the length of 320mm for automatic fiber laying, and placing the carbon fiber pre-impregnated tow in a standard temperature and humidity test environment for standing for 10 hours;
b. vertically fixing one end of the carbon fiber pre-impregnated tows 1 for automatic fiber laying by using a clamp 2 in the test environment of the step a, hanging a load 3 of 145g at the other end of the carbon fiber pre-impregnated tows for automatic fiber laying for suspending for 45min, and correcting the bending, twisting and wrinkling of the carbon fiber pre-impregnated tows 1 for automatic fiber laying;
c. unloading the load 3, taking down the carbon fiber pre-impregnated tows 1 for automatic fiber laying, cutting the carbon fiber pre-impregnated tows to a length of 250mm to obtain a test sample 4, placing one end of the test sample 4 with a length of 50mm on a horizontal test table 5 for fixing, extending the other end of the test sample 4 with a length of 200mm out of the horizontal test table 5, measuring and recording the extending length L0；
d. The test sample 4 naturally sags under the action of gravity, stands for 10min, and the horizontal length L of the test sample 6 in the horizontal direction is measured and recorded1；
e. Calculate the stiffness S of the test specimen 4AFP，SAFPValues closer to 1 indicate that the test specimen 4 is stiffer and conversely softer.
In the step a, when the carbon fiber pre-impregnated tows 1 for automatic fiber laying are cut, ports at two ends are kept straight, and when the length of the carbon fiber pre-impregnated tows 1 for automatic fiber laying is measured, the carbon fiber pre-impregnated tows 1 for automatic fiber laying are kept straight, wherein the standard temperature and humidity test environment refers to that the temperature is 26 ℃ and the humidity is 65%.
In the step c, the test sample 4 specifically refers to the carbon fiber prepreg tows 1 for automatic fiber laying, which have no bending, twisting and wrinkling and are 250mm in length.
In the step c, one end 50mm long of the test sample 4 is placed on the horizontal test table 5 for fixing, specifically, the test sample 4 is pressed on the horizontal test table 5 by a weight 7 of 3 KG.
In the step c, the other end of the test sample 4 with the length of 200mm extending out of the horizontal test table 5 specifically means that the test sample 4 with the length of 200mm is kept parallel to the horizontal test table 5 and extends out of the horizontal test table 5.
In said step d, the horizontal length L in the horizontal direction of the test completion specimen 6 is measured and recorded1In particular, the method uses and measures L0The same reference point or two reference points are measured on the same vertical reference plane.
Example 5
Referring to fig. 1 and 2, a stiffness test method for an automatic fiber-laying carbon fiber prepreg tow includes the following steps:
a. cutting a carbon fiber pre-impregnated tow 1 with the length of 320mm for automatic fiber laying, and placing the carbon fiber pre-impregnated tow in a standard temperature and humidity test environment for standing for 10 hours;
b. vertically fixing one end of the carbon fiber pre-impregnated tows 1 for automatic fiber laying by using a clamp 2 in the test environment of the step a, hanging 150g of load 3 at the other end of the carbon fiber pre-impregnated tows for automatic fiber laying, and standing for 50min for correcting bending, twisting and wrinkling of the carbon fiber pre-impregnated tows 1 for automatic fiber laying;
c. unloading the load 3, taking down the carbon fiber pre-impregnated tows 1 for automatic fiber laying, cutting the carbon fiber pre-impregnated tows to a length of 250mm to obtain a test sample 4, placing one end of the test sample 4 with a length of 50mm on a horizontal test table 5 for fixing, extending the other end of the test sample 4 with a length of 200mm out of the horizontal test table 5, measuring and recording the extending length L0；
d. The test sample 4 naturally sags under the action of gravity, stands for 10min, and the horizontal length L of the test sample 6 in the horizontal direction is measured and recorded1；
e. Calculate the stiffness S of the test specimen 4AFP，SAFPValues closer to 1 indicate that the test specimen 4 is stiffer and conversely softer.
In the step a, when the carbon fiber pre-impregnated tows 1 for automatic fiber laying are cut, ports at two ends are kept straight, and when the length of the carbon fiber pre-impregnated tows 1 for automatic fiber laying is measured, the carbon fiber pre-impregnated tows 1 for automatic fiber laying are kept straight, wherein the standard temperature and humidity test environment refers to that the temperature is 26 ℃ and the humidity is 65%.
In the step c, the test sample 4 specifically refers to the carbon fiber prepreg tows 1 for automatic fiber laying, which have no bending, twisting and wrinkling and are 250mm in length.
In the step c, one end of the test sample 4 with the length of 50mm is placed on the horizontal test table 5 for fixing, specifically, the test sample 4 is pressed on the horizontal test table 5 by adopting a weight 7 with 5 KG.
In the step c, the other end of the test sample 4 with the length of 200mm extending out of the horizontal test table 5 specifically means that the test sample 4 with the length of 200mm is kept parallel to the horizontal test table 5 and extends out of the horizontal test table 5.
In said step d, the horizontal length L in the horizontal direction of the test completion specimen 6 is measured and recorded1In particular, the method uses and measures L0The same reference point or two reference points are measured on the same vertical reference plane.
In said step e, the stiffness S of the test specimen 4 is testedAFPIs calculated by the formula SAFP＝L1/L0。
In the step c, the test sample 4 is the carbon fiber prepreg 1 for automatic fiber laying, which has no bending, twisting and wrinkling and is 250mm in length, so that the test accuracy can be further ensured.
In step d, the horizontal length L in the horizontal direction of the test completion specimen 6 is measured and recorded1In particular, the method uses and measures L0The same reference point or two reference points are measured on the same vertical reference surface, and the measurement is carried out on the same reference point or the same vertical reference surface, so that the stiffness value of the test sample 4 obtained by subsequent calculation is more objective and real, and the method is favorable for providing test data for laying track planning and automatic laying carbon fiber prepreg tow 1 process modification.

Claims (7)

1. A stiffness testing method for an automatic fiber-laying carbon fiber prepreg tow is characterized by comprising the following steps:
a. cutting the carbon fiber pre-impregnated tows (1) with the lengths of 300 and 320mm for automatic fiber laying, and placing the pre-impregnated tows in a standard temperature and humidity test environment for standing for 8-10 h;
b. vertically fixing one end of the carbon fiber pre-impregnated tows (1) for automatic fiber laying by using a clamp (2) in the test environment of the step a, hanging the other end of the carbon fiber pre-impregnated tows (1) for 100-150g, and standing for 30-50min for correcting the bending, twisting and wrinkling of the carbon fiber pre-impregnated tows (1) for automatic fiber laying;
c. unloading the load (3), taking off the carbon fiber pre-impregnated tows (1) for automatic fiber laying, cutting the carbon fiber pre-impregnated tows (1) with the length of 250mm to be used as a test sample (4), placing one end of the test sample (4) with the length of 50mm on a horizontal test table top (5) for fixing, extending the other end of the test sample with the length of 200mm out of the horizontal test table top (5), measuring and recording the extending length L0；
d. Naturally drooping the test sample (4) under the action of gravity, standing for 5-10min, measuring and recording the horizontal length L of the test sample (6) in the horizontal direction1；
e. Calculating the stiffness S of the test specimen (4)AFP，SAFPValues closer to 1 indicate that the test specimen (4) is stiffer and conversely softer.
2. The stiffness testing method for the automatic fiber-laying carbon fiber prepreg tows according to claim 1, characterized by comprising the following steps of: in the step a, when the carbon fiber pre-impregnated tows (1) for automatic fiber laying are cut, ports at two ends are kept straight, when the length of the carbon fiber pre-impregnated tows (1) for automatic fiber laying is measured, the carbon fiber pre-impregnated tows (1) for automatic fiber laying are kept straight, and the standard temperature and humidity test environment refers to that the temperature is 18-26 ℃ and the humidity is 30-65%.
3. The stiffness testing method for the automatic fiber-laying carbon fiber prepreg tows according to claim 1, characterized by comprising the following steps of: in the step c, the test sample (4) is specifically the carbon fiber prepreg tows (1) for automatic fiber laying, which are free from bending, twisting and wrinkling and have the length of 250 mm.
4. The stiffness testing method for the automatic fiber-laying carbon fiber prepreg tows according to claim 1, characterized by comprising the following steps of: in the step c, one end of the test sample (4) with the length of 50mm is placed on the horizontal test table top (5) for fixing, specifically, the test sample (4) is pressed on the horizontal test table top (5) by a weight (7) of 2-5 KG.
5. The stiffness testing method for the automatic fiber-laying carbon fiber prepreg tows according to claim 1, characterized by comprising the following steps of: in the step c, the other end of the test sample (4) with the length of 200mm extending out of the horizontal test table (5) specifically means that the test sample (4) with the length of 200mm is kept parallel to the horizontal test table (5) and extends out of the horizontal test table (5).
6. The stiffness testing method for the automatic fiber-laying carbon fiber prepreg tows according to claim 1, characterized by comprising the following steps of: in said step d, the horizontal length L of the test end specimen (6) in the horizontal direction is measured and recorded1In particular, the method uses and measures L0The same reference point or two reference points are measured on the same vertical reference plane.
7. The stiffness testing method for the automatic fiber-laying carbon fiber prepreg tows according to claim 1, characterized by comprising the following steps of: in the step e, the stiffness S of the test sample (4) is testedAFPIs calculated by the formula SAFP＝L1/L0。
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