A method and apparatus for obtaining the elastic modulus and its relationship of aluminum alloy.

Abstract

This application discloses a method and apparatus for obtaining the elastic modulus and its relationship in aluminum-clad alloys. Based on obtaining the original tensile stress-strain curve through room temperature tensile testing of the aluminum-clad alloy, a typical tensile stress-strain curve is calculated, and its tangent modulus is obtained to plot a stress-tangent modulus curve. According to the stress-tangent modulus curve, the primary and secondary elastic modulus segments and the transition region where the aluminum cladding layer begins to yield are obtained. Based on this, the primary and secondary elastic moduli are obtained before the proportional limit of the typical tensile stress-strain curve. Based on the known basic relationship between the primary and secondary elastic moduli, a correlation coefficient is introduced. Substituting the aforementioned primary and secondary elastic modulus values ​​into the formula, the correlation coefficient value is determined, thereby obtaining the relationship for the elastic modulus of the aluminum-clad alloy. This invention provides a method for calculating the primary and secondary elastic moduli of aluminum-clad alloys, which can accurately obtain and characterize the primary and secondary elastic moduli of aluminum-clad alloys. It is convenient to use and has significant engineering application value.

Description

Technical Field

[0001] This application relates to the field of static performance technology, and in particular to a method and apparatus for obtaining the elastic modulus and its relationship of aluminum alloy. Background Technology

[0002] Aluminum-clad alloys consist of an aluminum cladding layer and a core material, and possess two independent elastic moduli values. The principal modulus represents the combined elastic response of the low-strength aluminum cladding layer and the high-strength core material, while the secondary modulus represents the elastic modulus exhibited within the proportional limits of the core material. In most practical applications, it is necessary to obtain precise values ​​for both the principal and secondary elastic moduli for ease of application.

[0003] In existing technologies, the distinction between primary and secondary elastic moduli is not clearly defined in China. Foreign literature only lists the relationship between the two without providing methods for obtaining the elastic modulus and their formulas. Therefore, accurately obtaining the primary and secondary elastic moduli and their formulas for clad aluminum alloys has become an urgent problem to be solved. Summary of the Invention

[0004] To address the aforementioned issues, this application provides a method and apparatus for obtaining the elastic modulus and its relationship of clad aluminum alloys, so as to accurately obtain the primary and secondary elastic moduli and their relationship of clad aluminum alloys.

[0005] This application discloses a method for obtaining the elastic modulus and its relationship of aluminum alloy, the method comprising:

[0006] Obtain typical tensile stress-strain curves of the aluminum-clad alloy;

[0007] Obtain the tangent modulus of the typical tensile stress-strain curve and plot the stress-tangent modulus curve;

[0008] Based on the stress-tangent modulus curve, the primary elastic modulus segment, the secondary elastic modulus segment, and the transition region where the aluminum cladding layer begins to yield are obtained.

[0009] Based on the primary elastic modulus segment, the secondary elastic modulus segment, and the transition region where the aluminum cladding layer begins to yield, the primary elastic modulus and secondary elastic modulus of the aluminum cladding alloy are obtained before the proportional limit of a typical tensile stress-strain curve.

[0010] Based on the primary elastic modulus, the secondary elastic modulus, and their basic relationship, the formula for the elastic modulus of aluminum alloy is obtained.

[0011] Optionally, before obtaining the typical tensile stress-strain curve of the clad aluminum alloy, the method further includes:

[0012] Obtain the alloy thickness and cladding layer thickness of the aluminum alloy;

[0013] A room temperature tensile test was performed on the aluminum-clad alloy to obtain the original tensile stress-strain curve;

[0014] Based on the original tensile stress-strain curve, the typical tensile stress-strain curve is constructed.

[0015] Optionally, representative stress-strain data for the relevant products have been adjusted to reflect accurate typical values ​​of elastic modulus. The construction of the typical tensile stress-strain curve based on the original tensile stress-strain curve includes:

[0016] Extend the straight line portion of each of the original tensile stress-strain curves, and then shift the extended straight line along the horizontal axis by a preset deviation amount; the preset deviation amount ranges from 0 to the deviation amount corresponding to the yield strength point.

[0017] The intersection of the straight line and the original tensile stress-strain curve is defined as the deviation point;

[0018] Obtain the average stress value of all the aforementioned deviation points, and convert the average stress value into the average stress of the aluminum alloy-clad product:

[0019]

[0020] σ T The average stress of the product, The average yield strength of the product σ is the average yield strength. A This represents the average stress at each deviation point;

[0021] Obtain the elastic strain at the deviation point and the deviation of the straight line corresponding to the deviation point, and add them together to obtain the total strain at the deviation point:

[0022] ε T =ε E +D

[0023] ε T For the total strain at each deviation point, ε E D is the elastic strain at each deviation point, and D is the offset.

[0024] Based on the total strain and the average stress of the product, the typical tensile stress-strain curve is obtained.

[0025] Optionally, obtaining the tangent modulus of the typical tensile stress-strain curve and plotting the stress-tangent modulus curve includes:

[0026] Differentiating the stage before the proportional limit of the typical tensile stress-strain curve yields the tangent modulus of that stage and the corresponding stress.

[0027] The stress-tangent modulus curve is obtained using the tangent modulus and the stress.

[0028] Optionally, obtaining the formula for the elastic modulus of the aluminum alloy based on the primary elastic modulus, the secondary elastic modulus, and their fundamental relationship includes:

[0029] The correlation coefficient is determined based on the primary elastic modulus and the secondary elastic modulus;

[0030] The correlation coefficient is combined with the relationship between the principal elastic modulus and the secondary elastic modulus. sec ~E p (t1-t0) / t1 yields the relationship between the principal elastic modulus and the secondary elastic modulus:

[0031] E sec =fE p (t1-t0) / t1

[0032] E p Let E be the principal elastic modulus. sec t1 is the secondary elastic modulus, t1 is the total thickness of the aluminum cladding alloy, t0 is the thickness of the aluminum cladding layer, and f is the correlation coefficient.

[0033] Based on the above-mentioned method for obtaining the elastic modulus and its relationship of clad aluminum alloys, this application also discloses a device for obtaining the elastic modulus and its relationship of clad aluminum alloys, including: a typical curve acquisition unit, a tangent modulus acquisition unit, a region acquisition unit, an elastic modulus acquisition unit, and a relationship acquisition unit;

[0034] The typical curve acquisition unit is used to acquire the typical tensile stress-strain curve of the aluminum-clad alloy.

[0035] The tangent modulus acquisition unit is used to acquire the tangent modulus of the typical tensile stress-strain curve and plot the stress-tangent modulus curve.

[0036] The region acquisition unit is used to acquire the primary elastic modulus segment, the secondary elastic modulus segment, and the transition region where the aluminum cladding layer begins to yield, based on the stress-tangent modulus curve.

[0037] The elastic modulus acquisition unit is used to acquire the primary elastic modulus and secondary elastic modulus of the aluminum-clad alloy before the proportional limit of a typical tensile stress-strain curve, based on the primary elastic modulus segment, the secondary elastic modulus segment, and the transition region where the aluminum cladding layer begins to yield.

[0038] The relational expression acquisition unit is used to obtain the relational expression for the elastic modulus of the aluminum alloy based on the primary elastic modulus, the secondary elastic modulus, and the basic relationship between the two.

[0039] Optionally, the device further includes:

[0040] A thickness acquisition unit is used to acquire the alloy thickness and the thickness of the aluminum cladding layer of the aluminum alloy.

[0041] The test unit is used to conduct room temperature tensile tests on the aluminum-clad alloy to obtain the original tensile stress-strain curves;

[0042] The curve construction unit is used to construct the typical tensile stress-strain curve based on the original tensile stress-strain curve.

[0043] Optionally, representative stress-strain data for the relevant articles have been adjusted to reflect accurate typical values ​​of the elastic modulus, and the curve building unit includes:

[0044] The translation sub-unit is used to extend the straight line portion of each of the original tensile stress-strain curves and translate the extended straight line along the horizontal axis by a preset deviation amount; the preset deviation amount ranges from 0 to the deviation amount corresponding to the yield strength point.

[0045] Define a sub-unit to define the intersection of the straight line and the original tensile stress-strain curve as the deviation point;

[0046] A conversion subunit is used to obtain the average stress value of all the deviation points and convert the average stress value into the average stress of the aluminum alloy-clad product.

[0047]

[0048] σ T The average stress of the product, The average yield strength of the product σ is the average yield strength. A This represents the average stress at each deviation point;

[0049] The total strain acquisition sub-unit is used to acquire the elastic strain at the deviation point and the deviation of the straight line corresponding to the deviation point, and add them together to obtain the total strain at the deviation point:

[0050] ε T =ε E +D

[0051] ε T For the total strain at each deviation point, ε E D is the elastic strain at each deviation point, and D is the offset.

[0052] A typical curve acquisition sub-unit is used to obtain the typical tensile stress-strain curve based on the total strain and the average stress of the product.

[0053] Optionally, the tangent modulus acquisition unit includes:

[0054] A derivative sub-unit is used to differentiate the stage before the proportional limit of the typical tensile stress-strain curve to obtain the tangent modulus of the stage and the corresponding stress.

[0055] A stress-tangent modulus curve acquisition sub-unit is used to obtain the stress-tangent modulus curve through the tangent modulus and the stress.

[0056] Optionally, the device further includes:

[0057] A correlation coefficient determination unit is used to determine the correlation coefficient based on the principal elastic modulus and the secondary elastic modulus;

[0058] The relation acquisition unit is used to combine the correlation coefficient with the relationship E between the principal elastic modulus and the secondary elastic modulus. sec ~E p (t1-t0) / t1 yields the relationship between the principal elastic modulus and the secondary elastic modulus:

[0059] E sec =fE p (t1-t0) / t1

[0060] E p Let E be the principal elastic modulus. sec t1 is the secondary elastic modulus, t1 is the total thickness of the aluminum cladding alloy, t0 is the thickness of the aluminum cladding layer, and f is the correlation coefficient.

[0061] This application discloses a method and apparatus for obtaining the elastic modulus of an aluminum-clad alloy and determining its relationship. Based on obtaining the original tensile stress-strain curve through room temperature tensile testing of the aluminum-clad alloy, a typical tensile stress-strain curve of the aluminum-clad alloy is calculated, the tangent modulus of the typical tensile stress-strain curve is obtained, and a stress-tangent modulus curve is plotted. Based on the stress-tangent modulus curve, the primary elastic modulus segment, the secondary elastic modulus segment, and the transition region where the aluminum cladding layer begins to yield are obtained. Based on the above region, the primary and secondary elastic moduli of the aluminum-clad alloy are obtained before the proportional limit of the typical tensile stress-strain curve. Based on the known basic relationship between the primary and secondary elastic moduli, a correlation coefficient is introduced. The primary and secondary elastic moduli values ​​are substituted into the formula to determine the correlation coefficient value, thereby obtaining the relationship for the aluminum-clad alloy. Based on the typical tensile stress-strain curve, a method for calculating the primary and secondary elastic moduli of an aluminum-clad alloy is provided, which can accurately obtain and characterize the primary and secondary elastic moduli of the aluminum-clad alloy. It is convenient to use and has great engineering application significance. Attached Figure Description

[0062] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only schematic diagrams of the embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0063] Figure 1a This is a flowchart illustrating a method for obtaining the elastic modulus and its relationship of an aluminum alloy, as disclosed in an embodiment of this application.

[0064] Figure 1b This is a schematic diagram comparing typical tensile stress-strain curves obtained by the two methods disclosed in the embodiments of this application;

[0065] Figure 1c This is a schematic diagram of the stress-tangent modulus curve disclosed in the embodiments of this application;

[0066] Figure 1d This is a schematic diagram illustrating the analysis of the primary and secondary elastic moduli disclosed in the embodiments of this application;

[0067] Figure 2 This is a flowchart illustrating another method for obtaining the elastic modulus and its relationship of aluminum alloy disclosed in an embodiment of this application.

[0068] Figure 3 This is a schematic diagram of a device for obtaining the elastic modulus and its relationship of an aluminum alloy, as disclosed in an embodiment of this application. Detailed Implementation

[0069] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0070] Example 1: This application discloses a method for obtaining the elastic modulus and its relationship of aluminum alloy.

[0071] For details, please refer to Figure 1a The method for obtaining the elastic modulus and its relationship of aluminum alloy disclosed in this embodiment includes the following steps:

[0072] Step 101: Obtain the typical tensile stress-strain curve of the clad aluminum alloy.

[0073] In this embodiment, as an optional method, the alloy thickness and cladding layer thickness of the aluminum alloy are first obtained, and a room temperature tensile test is performed on the aluminum alloy to obtain the original tensile stress-strain curves. Multiple original tensile stress-strain curves are obtained continuously during the test.

[0074] In this embodiment, as an optional method, the strain deviation method is used to characterize typical tensile stress-strain curves. Specifically, the straight line portion of each original tensile stress-strain curve is extended, and the extended straight line is shifted along the horizontal axis (strain) by a preset deviation amount. The preset deviation amount ranges from 0 to the deviation amount corresponding to the yield strength point (0.002). Simply put, after extending the straight line portions of these original tensile stress-strain curves, each curve is shifted one by one along the horizontal axis, so that the last straight line is shifted exactly 0.002 units. Then, the intersection point (i.e., the deviation point) of each straight line with the original tensile stress-strain curve is defined as the deviation point. The stress values ​​of all deviation points are obtained, and the average stress value is obtained. The average stress value is then converted into the average stress of the aluminum alloy-clad product using the following formula:

[0075]

[0076] In the formula, σ T σ is the average stress of aluminum alloy-clad products. A The average stress at each deviation point. The average yield strength of aluminum alloy-clad products. The average yield strength is the key difference between the two. The average yield strength of aluminum alloy products reflects the overall yield strength level of the material and is a statistical result covering multiple batches, while the average yield strength only represents the average yield strength of a subset of samples of the material.

[0077] Subsequently, as an optional method, the elastic strain at all deviation points and the deviation of the corresponding straight line at each deviation point are obtained. The elastic strain at each deviation point is added to the corresponding offset to obtain the different total strain ε corresponding to different deviation points. T :

[0078] ε T =ε E +D (2)

[0079] In the formula, ε T For the total strain, ε E Let D be the elastic strain at each deviation point, and D be the deviation amount.

[0080] Finally, a typical tensile stress-strain curve was constructed with the total strain as the x-axis and the average stress of the aluminum-clad product as the y-axis.

[0081] In the method described in this embodiment, as an alternative method, the Ramberg-Osgood method is used to characterize typical tensile stress-strain curves. Specifically,

[0082] ε T =ε E +ε P (3)

[0083] In the formula, ε T For the total strain, ε E For elastic strain, ε P This is plastic strain.

[0084]

[0085] In the formula, f is the stress, f 0.2ys The yield strength is 0.2%, and n is the Ramberg-Osgood parameter.

[0086] The formula for calculating n is as follows:

[0087]

[0088] In the formula, N is the number of data points, y is the natural logarithm of f (i.e., y = lnf), and x is:

[0089]

[0090] In this method, a typical tensile stress-strain curve is constructed based on x and y.

[0091] In the method described in this embodiment, the typical tensile stress-strain curve of the aluminum alloy is characterized by two methods, and the curves obtained by these two methods are as follows: Figure 1b As shown. Figure 1b This is a comparative schematic diagram of typical tensile stress-strain curves obtained by the two methods disclosed in the embodiments of this application. The comparison shows that the strain deviation method can more accurately characterize the typical tensile stress-strain curve of aluminum-clad alloys.

[0092] Step 102: Obtain the tangent modulus of the typical tensile stress-strain curve and plot the stress-tangent modulus curve.

[0093] In the method described in this embodiment, as an optional approach, the derivative of the stage before the proportional limit of a typical tensile stress-strain curve is taken to obtain the tangent modulus of that stage and the stress corresponding to that tangent modulus. The stress-tangent modulus curve can then be obtained from the tangent modulus and the stress. Figure 1cThe figure shows a schematic diagram of the stress-tangent modulus curve disclosed in the embodiments of this application. By differentiating the curve before the proportional limit of a typical tensile stress-strain curve, the tangent modulus of that stage can be obtained, thus yielding three tangent modulus segments. It can be seen that the primary elastic modulus segment and the secondary elastic modulus segment are straight lines perpendicular to the x-axis, that is, the slopes of the primary elastic modulus segment and the secondary elastic modulus segment are constant, while the slope of the transition region changes.

[0094] Step 103: Based on the stress-tangent modulus curve, obtain the primary elastic modulus segment, the secondary elastic modulus segment, and the transition region where the aluminum cladding layer begins to yield.

[0095] In the method described in this embodiment, as an optional method, the transition region between the primary elastic modulus segment, the secondary elastic modulus segment, and the point where the aluminum cladding layer begins to yield (i.e., between the primary and secondary elastic modulus segments) is determined from the stress-tangential modulus curve.

[0096] Step 104: Based on the primary elastic modulus segment, the secondary elastic modulus segment, and the transition region where the aluminum cladding layer begins to yield, obtain the primary elastic modulus and secondary elastic modulus of the aluminum cladding alloy before the proportional limit of the typical tensile stress-strain curve.

[0097] In the method described in this embodiment, as an optional approach, the primary elastic modulus and secondary elastic modulus are obtained before the proportional limit of a typical stress-strain curve, based on the primary elastic modulus segment, the secondary elastic modulus segment, and the transition region where the aluminum cladding layer begins to yield. The proportional limit is the maximum stress index that ensures the elastic deformation of the metal changes in a linear proportional relationship. Figure 1d The figure shows a schematic diagram of the analysis of the primary and secondary elastic moduli disclosed in the embodiments of this application. As shown in the figure, the primary elastic modulus and the secondary elastic modulus are two straight line segments with different slopes.

[0098] Step 105: Based on the primary elastic modulus, the secondary elastic modulus, and their basic relationship, obtain the formula for the elastic modulus of the aluminum alloy.

[0099] In the method described in this embodiment, the basic relationship E is known. sec ~E p (t1-t0) / t1, where E p Let E be the principal elastic modulus. sec Let t1 be the secondary elastic modulus, t1 be the total thickness of the aluminum cladding alloy, and t0 be the thickness of the aluminum cladding layer. As an optional method, the obtained primary and secondary elastic moduli can be substituted into this basic relationship. Since both ends of this basic relationship are directly proportional, substituting them yields the coefficient of the proportional relationship, i.e., the correlation coefficient. Combining the correlation coefficient with the basic relationship between the primary and secondary elastic moduli, the relationship between the primary and secondary elastic moduli is obtained as follows:

[0100] E sec=fE p (t1-t0) / t1 (7)

[0101] In the formula, f is the correlation coefficient.

[0102] The method described in this embodiment obtains the alloy thickness and cladding layer thickness, conducts room temperature tensile tests, and obtains the original tensile stress-strain curves. Typical tensile stress-strain curves of the cladding alloy are plotted using both the strain deviation method and the Ramberg-Osgood method. Comparison shows that the strain deviation method is more suitable for cladding alloy materials. Furthermore, a method for calculating the principal and secondary elastic moduli of the cladding alloy is provided. Based on the known basic relationship between the principal and secondary elastic moduli, a correlation coefficient is introduced to obtain the relationship between the principal and secondary elastic moduli. This method can accurately obtain and characterize the principal and secondary elastic moduli of the cladding alloy, is convenient to use, and has significant engineering application value.

[0103] Example 2: This application discloses another method for obtaining the elastic modulus and its relationship of aluminum alloy.

[0104] For details, please refer to Figure 2 Another method for obtaining the elastic modulus and its relationship of aluminum alloy disclosed in this embodiment includes the following steps:

[0105] 201: Typical tensile stress-strain curves of clad aluminum alloys were characterized using the strain deviation method;

[0106] 202: Differentiate the data in a typical tensile stress-strain curve to obtain the tangent modulus and plot the stress-tangent modulus curve;

[0107] 203: Determine the primary elastic modulus segment, the secondary elastic modulus segment, and the transition region where the aluminum cladding layer begins to yield from the stress-tangent modulus curve;

[0108] 204: Based on the primary elastic modulus segment, the secondary elastic modulus segment, and the transition region where the aluminum cladding layer begins to yield, calculate the primary elastic modulus and the secondary elastic modulus before the proportional limit of the typical tensile stress-strain curve.

[0109] 205: Based on the known fundamental relation E sec ~E p (t1-t0) / t1 yields the following relation:

[0110] E sec =fE p (t1-t0) / t1

[0111] E p Principal elastic modulus, E sec t1 is the secondary elastic modulus, t1 is the total thickness of the aluminum cladding alloy, t0 is the thickness of the aluminum cladding layer, and f is the correlation coefficient.

[0112] Based on the method for obtaining the elastic modulus and its relationship of clad aluminum alloys disclosed in the above embodiments, this embodiment correspondingly discloses a device for obtaining the elastic modulus and its relationship of clad aluminum alloys. Please refer to... Figure 3 The device for obtaining the elastic modulus and relation of aluminum alloy includes: a typical curve acquisition unit 301, a tangent modulus acquisition unit 302, a region acquisition unit 303, an elastic modulus acquisition unit 304, and a relation acquisition unit 305.

[0113] The typical curve acquisition unit 301 is used to acquire the typical tensile stress-strain curve of the aluminum alloy.

[0114] The tangent modulus acquisition unit 302 is used to acquire the tangent modulus of the typical tensile stress-strain curve and plot the stress-tangent modulus curve.

[0115] The region acquisition unit 303 is used to acquire the primary elastic modulus segment, the secondary elastic modulus segment, and the transition region where the aluminum cladding layer begins to yield, based on the stress-tangent modulus curve.

[0116] The elastic modulus acquisition unit 304 is used to acquire the primary elastic modulus and secondary elastic modulus of the aluminum-clad alloy before the proportional limit of a typical tensile stress-strain curve, based on the primary elastic modulus segment, the secondary elastic modulus segment, and the transition region where the aluminum cladding layer begins to yield.

[0117] The relational formula acquisition unit 305 is used to acquire the relational formula of the elastic modulus of aluminum alloy based on the primary elastic modulus, the secondary elastic modulus and their basic relationship.

[0118] Optionally, the device further includes:

[0119] A thickness acquisition unit is used to acquire the alloy thickness and the thickness of the aluminum cladding layer of the aluminum alloy.

[0120] The test unit is used to conduct room temperature tensile tests on the aluminum-clad alloy to obtain the original tensile stress-strain curves;

[0121] The curve construction unit is used to construct the typical tensile stress-strain curve based on the original tensile stress-strain curve.

[0122] Optionally, representative stress-strain data for the relevant articles have been adjusted to reflect accurate typical values ​​of the elastic modulus, and the curve building unit includes:

[0123] The translation sub-unit is used to extend the straight line portion of each of the original tensile stress-strain curves and translate the extended straight line along the horizontal axis by a preset deviation amount; the preset deviation amount ranges from 0 to the deviation amount corresponding to the yield strength point.

[0124] Define a sub-unit to define the intersection of the straight line and the original tensile stress-strain curve as the deviation point;

[0125] A conversion subunit is used to obtain the average stress value of all the deviation points and convert the average stress value into the average stress of the aluminum alloy-clad product.

[0126]

[0127] σ T The average stress of the product, The average yield strength of the product σ is the average yield strength. A This represents the average stress at each deviation point;

[0128] The total strain acquisition sub-unit is used to acquire the elastic strain at the deviation point and the deviation of the straight line corresponding to the deviation point, and add them together to obtain the total strain at the deviation point:

[0129] ε T =ε E +D

[0130] ε T For the total strain at each deviation point, ε E D is the elastic strain at each deviation point, and D is the offset.

[0131] A typical curve acquisition sub-unit is used to obtain the typical tensile stress-strain curve based on the total strain and the average stress of the product.

[0132] Optionally, the tangent modulus acquisition unit 302 includes:

[0133] A derivative sub-unit is used to differentiate the stage before the proportional limit of the typical tensile stress-strain curve to obtain the tangent modulus of the stage and the corresponding stress.

[0134] A stress-tangent modulus curve acquisition sub-unit is used to obtain the stress-tangent modulus curve through the tangent modulus and the stress.

[0135] Optionally, the device further includes:

[0136] A correlation coefficient determination unit is used to determine the correlation coefficient based on the principal elastic modulus and the secondary elastic modulus;

[0137] The relation acquisition unit is used to combine the correlation coefficient with the relationship E between the principal elastic modulus and the secondary elastic modulus. sec ~E p(t1-t0) / t1 yields the relationship between the principal elastic modulus and the secondary elastic modulus:

[0138] E sec =fE p (t1-t0) / t1

[0139] E p Let E be the principal elastic modulus. sec t1 is the secondary elastic modulus, t1 is the total thickness of the aluminum cladding alloy, t0 is the thickness of the aluminum cladding layer, and f is the correlation coefficient.

[0140] The embodiments in this specification are described in a progressive manner. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant details can be found in the method section.

[0141] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0142] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0143] The features described in the embodiments of this specification can be substituted for or combined with each other, so that those skilled in the art can implement or use this application.

[0144] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for obtaining the elastic modulus and the relationship of an aluminum clad alloy, characterized by, The method comprises: obtaining a typical tensile stress-strain curve of the clad aluminum alloy; obtaining a tangent modulus of the typical tensile stress-strain curve, and drawing a stress-tangent modulus curve; obtaining a primary elastic modulus section, a secondary elastic modulus section and a transition region where the clad layer starts to yield according to the stress-tangent modulus curve; obtaining a primary elastic modulus and a secondary elastic modulus of the clad aluminum alloy before the proportional limit of the typical tensile stress-strain curve according to the primary elastic modulus section, the secondary elastic modulus section and the transition region where the clad layer starts to yield; obtaining a relational expression of the elastic modulus of the clad aluminum alloy according to the primary elastic modulus, the secondary elastic modulus and a basic relationship therebetween; Before obtaining the typical tensile stress-strain curve of the clad aluminum alloy, the method further comprises: obtaining an alloy thickness and a clad layer thickness of the clad aluminum alloy; carrying out a room temperature tensile test on the clad aluminum alloy to obtain an original tensile stress-strain curve; constructing the typical tensile stress-strain curve according to the original tensile stress-strain curve; The stress-strain data of the representative product has been adjusted to be suitable for reflecting the typical value of the accurate elastic modulus, and the constructing the typical tensile stress-strain curve according to the original tensile stress-strain curve comprises: extending a straight line part of each of the original tensile stress-strain curves, and translating the extended straight line in the transverse coordinate direction by a preset deviation amount, respectively; the preset deviation amount is in a range of 0 to a deviation amount corresponding to a yield strength point; defining an intersection point of the straight line and the original tensile stress-strain curve as a deviation point; obtaining a stress average value of all the deviation points, and converting the stress average value into a product average stress of the clad aluminum alloy: ； σ T σy σy σy A σ obtaining an elastic strain of the deviation point and a deviation amount of the straight line corresponding to the deviation point, and adding them to obtain a total strain of the deviation point: ε T =ε E +D ε T ε is the total strain at each point of deviation, ε E D is the amount of deviation; obtaining the typical tensile stress-strain curve based on the total strain and the product average stress.

2. The method of claim 1, wherein, The obtaining the tangent modulus of the typical tensile stress-strain curve, and drawing the stress-tangent modulus curve comprises: deriving a stage before the proportional limit of the typical tensile stress-strain curve to obtain a tangent modulus of the stage and a corresponding stress; obtaining the stress-tangent modulus curve through the tangent modulus and the stress.

3. The method of claim 1, wherein, The obtaining the relational expression of the elastic modulus of the clad aluminum alloy according to the primary elastic modulus, the secondary elastic modulus and the basic relationship therebetween comprises: determining a correlation coefficient according to the primary elastic modulus and the secondary elastic modulus. combining the correlation coefficient with the relationship E sec ~E p (t1-t0) / t1, obtaining a relationship between the primary modulus of elasticity and the secondary modulus of elasticity E sec =fE p (t1-t0) / t1; E p E is the primary modulus of elasticity, E sec E is the secondary modulus of elasticity, t1 is the total thickness of the clad aluminum alloy, t0 is the thickness of the clad aluminum layer, and f is a correlation coefficient.

4. A device for obtaining the elastic modulus and its relationship of aluminum alloy, characterized in that, The method comprises: a typical curve obtaining unit, a tangent modulus obtaining unit, a region obtaining unit, an elastic modulus obtaining unit and a relational expression obtaining unit; the typical curve obtaining unit is configured to obtain a typical tensile stress-strain curve of the clad aluminum alloy; the tangent modulus obtaining unit is configured to obtain a tangent modulus of the typical tensile stress-strain curve, and draw a stress-tangent modulus curve; the region obtaining unit is configured to obtain a primary elastic modulus section, a secondary elastic modulus section and a transition region where a clad layer starts to yield according to the stress-tangent modulus curve; the elastic modulus obtaining unit is configured to obtain a primary elastic modulus and a secondary elastic modulus of the clad aluminum alloy before a proportional limit of the typical tensile stress-strain curve according to the primary elastic modulus section, the secondary elastic modulus section and the transition region where the clad layer starts to yield; and the relational expression obtaining unit is configured to obtain a relational expression of the elastic modulus of the clad aluminum alloy according to the primary elastic modulus, the secondary elastic modulus and a basic relationship therebetween. The elastic modulus obtaining unit is configured to obtain the primary elastic modulus and the secondary elastic modulus of the aluminum-clad alloy according to the primary elastic modulus section, the secondary elastic modulus section, and the transition region where the aluminum-clad layer starts to yield before the proportional limit of the typical tensile stress-strain curve; The relationship formula obtaining unit is configured to obtain a relationship formula of the elastic modulus of the aluminum-clad alloy according to the primary elastic modulus, the secondary elastic modulus, and the basic relationship therebetween; The device further comprises: A thickness obtaining unit configured to obtain the alloy thickness and the aluminum-clad layer thickness of the aluminum-clad alloy; A test unit configured to perform a room-temperature tensile test on the aluminum-clad alloy to obtain an original tensile stress-strain curve; A curve constructing unit configured to construct the typical tensile stress-strain curve according to the original tensile stress-strain curve; The stress-strain data of the related product has been adjusted to reflect the typical value of the accurate elastic modulus, and the curve constructing unit comprises: A translation subunit configured to extend the linear section of each of the original tensile stress-strain curves and translate the extended linear section in the horizontal coordinate direction by a preset offset amount, respectively; the preset offset amount ranges from 0 to the offset amount corresponding to the yield strength point; A defining subunit configured to define the intersection of the linear section and the original tensile stress-strain curve as an offset point; A conversion subunit configured to obtain the stress average of all the offset points and convert the stress average into the product average stress of the aluminum-clad alloy; ； σ T σy σy σy A σ A total strain obtaining subunit configured to obtain the elastic strain of the offset point and the offset amount of the linear section corresponding to the offset point and add them together to obtain the total strain of the offset point; ε T =ε E +D ε T ε is the total strain at each offset point E D is the offset; and A typical curve obtaining subunit configured to obtain the typical tensile stress-strain curve based on the total strain and the product average stress.

5. The apparatus of claim 4, wherein, The tangent modulus obtaining unit comprises: A derivation subunit configured to derive the stage before the proportional limit of the typical tensile stress-strain curve to obtain the tangent modulus of the stage and the corresponding stress; A stress-tangent modulus curve obtaining subunit configured to obtain a stress-tangent modulus curve through the tangent modulus and the stress.

6. The apparatus of claim 4, wherein, The device further comprises: A correlation coefficient determining unit configured to determine the correlation coefficient according to the primary elastic modulus and the secondary elastic modulus. a relationship acquisition unit configured to acquire a relationship E between the principal modulus of elasticity and the secondary modulus of elasticity based on the correlation coefficient sec ~E p (t1-t0) / t1, to acquire a relationship E between the principal modulus of elasticity and the secondary modulus of elasticity E sec =fE p (t1-t0) / t1; E p E is the primary modulus of elasticity, E sec E is the primary modulus of elasticity, t1 is the total thickness of the clad aluminum alloy, t0 is the thickness of the clad aluminum layer, and f is a correlation coefficient.

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