Test method for compressive strength of wood

Abstract

The present invention relates to a method for detecting the compressive strength of wood, and to the technical field of wood detection. The method for detecting the compressive strength of wood comprises the following steps: selecting a wood sample and recording the initial height H of the wood sample; limiting the bottom of the wood sample and limiting the surrounding side of the wood sample; after the wood sample is installed with limiting, applying pressure to the top of the wood sample, and recording the compression stroke D, the pressure load F, and the pressure area A during the pressure application. The method for detecting the compressive strength of wood provided by the present invention satisfies the axial displacement limitation and radial displacement limitation of the wood sample when it is under pressure by limiting the bottom and side of the wood sample. In this way, it not only ensures that the wood sample can fully bear the pressure applied to make the most realistic changes, but also ensures that the wood sample will not easily produce cracks, splits, fall over, and other problems, thereby improving the detection accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of wood detection, in particular to a method for detecting the compressive strength of wood. Background Art

[0002] When wood is selected as the main buffering and energy-absorbing material for radioactive material transport containers, the compressive strength of the wood in the direction of the grain needs to be considered. This strength is one of the important indicators affecting the buffering performance of wood.

[0003] However, current standards for testing wood compressive strength along the grain only measure the maximum compressive strength of the wood before collapse. During the test, the wood specimen is kept free in the transverse direction, which deviates from the actual compressive state of the wood in the shock absorber. Therefore, the data obtained using this test standard is less accurate and does not truly reflect the compressive strength of the wood. Summary of the Invention

[0004] Based on this, it is necessary to provide a method for detecting the compressive strength of wood to address the technical problem that the existing technology has low accuracy when testing the compressive strength of wood in the direction of the grain and cannot truly reflect the compressive strength of wood.

[0005] A method for testing the compressive strength of wood comprises the following steps: selecting a wood sample and recording an initial height H of the wood sample; limiting the bottom of the wood sample and limiting the sides of the wood sample; after the wood sample is position-limited, applying pressure to the top of the wood sample and recording the compression stroke D, the applied pressure load F, and the applied pressure area A during the pressure application.

[0006] The above-mentioned method for testing the compressive strength of wood ensures that the wood sample will not move along its own axial direction toward the direction of pressure when pressure is applied from the top by limiting the bottom of the wood sample, so as to keep the bottom reference of the wood sample unchanged. At the same time, the circumferential side of the wood sample is limited to ensure that the wood sample will not expand or split in its own radial direction or in a direction at an angle to its own axial direction when pressure is applied from the top; and, precisely because of the circumferential side limitation, the radial limitation of the wood sample, that is, the limitation of radial displacement, ensures that the wood sample will not easily fall over. In other words, the method for testing the compressive strength of wood provided by the present invention satisfies the axial displacement limitation and radial displacement limitation of the wood sample when it is under pressure by limiting the bottom and sides of the wood sample. In this way, it is not only ensured that the wood sample can fully bear the pressure applied to make the most realistic changes, but also ensured that the wood sample will not easily crack, split, fall over, and other problems, thereby improving the detection accuracy.

[0007] In some embodiments, before performing the top pressure test on the wood sample, a portion of the top of the wood sample is selected as the pressure site. By applying pressure locally, deformation occurs only in that portion of the wood sample, rather than in the entire wood sample, further alleviating the problem of the wood easily collapsing during the pressure application process.

[0008] In some embodiments, the pressure-applying portion is located in the middle of the wood sample, and the axis of the pressure-applying portion coincides with the installation axis of the wood sample, where the installation axis is the central axis of the wood sample after the wood sample is restrained and installed. This is equivalent to applying pressure to the middle of the wood sample, ensuring that the wood sample is subjected to uniform force along its radial direction.

[0009] In some embodiments, the cross-sectional area of ​​the pressure-applying portion accounts for 30%-45% of the cross-sectional area of ​​the wood sample. By limiting the numerical value, the problem of cracks on the side wall of the wood sample caused by pressure applied to the middle of the wood sample is alleviated while satisfying the pressure application operation.

[0010] In some embodiments, when limiting the lateral position of the wood specimen, the wood specimen is placed in a limiting base, and the size of the limiting base's installation space is adjusted based on the spacing between the wood specimen and the sidewalls of the limiting base, so that the sidewalls of the limiting base exert a compressive force against the sidewalls of the wood specimen. The limiting base is configured to facilitate assembly of the wood specimen, and the size of the limiting base's installation space is adjusted based on the spacing, thereby limiting the lateral position of the wood specimen while reducing pressure damage to the wood specimen.

[0011] In some embodiments, when adjusting the size of the installation space of the limiting base, a stopper is added between the side wall of the wood sample and the side wall of the limiting base until no new stopper can be added or the stopper is moved until the stopper is pressed against the side wall of the wood sample. Alternatively, when adjusting the size of the installation space of the limiting base, the side wall of the limiting base is moved to cause the side wall of the limiting base to be pressed against the side wall of the wood sample. The lateral limitation of the wood sample is satisfied by adding a stopper or moving the side wall of the limiting base. The additional stoppers can be installed one by one according to the spacing size, reducing the pressure loss on the wood sample; at the same time, the method of moving the side wall of the limiting base saves operation time and is convenient to operate.

[0012] In some embodiments, the wood sample is in the shape of a cubic column and has a first side wall and a second side wall arranged at an angle. When adjusting the size of the installation space of the limit base, the first side wall and the second side wall are respectively in close contact with the corresponding side wall of the limit base as an adjustment reference. This selection of a reference facilitates the lateral positioning of the wood sample.

[0013] In one embodiment, before the wood sample is positioned and installed, the installation position of the wood sample is adjusted so that the longitudinal grain of the wood sample extends from the top to the bottom of the wood sample. This satisfies the basic requirements for longitudinal compressive strength testing of the wood sample.

[0014] In one embodiment, after recording the compression stroke D and applied load F, the strength of the wood sample (S1 = F / A) is calculated based on the applied area A and the applied load F. Simultaneously, the engineering strain (S2 = D / H) of the wood sample is calculated based on the initial height H and the compression stroke D. This data allows the calculation of the compressive strength parameters of the wood sample, facilitating subsequent work.

[0015] In one embodiment, the wood compressive strength testing method further includes placing the wood sample in a temperature environment, adjusting the temperature to which the wood sample is subjected, and then performing a pressure test on the top of the wood sample. This operation can satisfy the compressive strength testing requirements of wood samples in different temperature environments, thereby determining the suitability of the wood for various applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A flow chart of a method for detecting the compressive strength of wood provided by an embodiment of the present invention;

[0017] Figure 2 A schematic diagram of a method for testing the compressive strength of wood provided in an embodiment of the present invention;

[0018] Figure 3 A schematic diagram of the adaptation of a wood sample to a limiting base and a pressure head in a wood compressive strength testing method provided by an embodiment of the present invention;

[0019] Figure 4 This is a schematic diagram of the adaptation of a wood sample and a pressure head in the wood compressive strength testing method provided by an embodiment of the present invention.

[0020] Reference numerals: 10 - wood sample; 11 - along the grain; 20 - pressure head; 30 - limiting base; 31 - bottom plate; 32 - side plate; 40 - stopper; 50 - locking column; 60 - thermocouple. DETAILED DESCRIPTION

[0021] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0024] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0025] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0026] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0027] As a natural material, wood is used in fields such as shock absorber filling, packaging and transportation due to its light weight, porosity and good buffering and energy absorption properties. Wood has significant anisotropy, and its mechanical properties in the direction of the grain (the direction of trunk growth) are significantly higher than those in the direction of the transverse grain (circumferential or radial direction of the trunk). Since the fiber structure inside the wood is distributed along the grain, when it is compressed in the direction of the grain, if the specimen is in an unconstrained state laterally, the wood specimen is prone to splitting, breaking, and falling over. At the same time, when wood is used as a buffering and energy-absorbing material, it is often covered with a metal shell or bound and constrained by other structures. When compressed, its lateral deformation is constrained.

[0028] In summary, to properly design shock absorbers based on wood properties, accurate measurement of wood's compressive strength is necessary. However, current standards for testing wood's compressive strength along the grain only test the maximum compressive strength of wood before collapse. Testing of wood's strength during deformation and compression is rare. Furthermore, during these tests, the wood specimens are kept in a free transverse state, which is inconsistent with the actual compressive state of the wood in the shock absorber and is therefore unsuitable for measuring the compressive strength along the grain of shock absorber wood.

[0029] In response to the above technical problems, an embodiment of the present invention provides a method for detecting the compressive strength of wood, which can not only meet the strength detection requirements of wood during deformation and compression along the grain direction, but also simulate the actual pressure-bearing state of wood in actual use, thereby reflecting the actual compressive strength of wood along the grain.

[0030] Figure 1 This is a flow chart of a method for detecting the compressive strength of wood provided by one embodiment of the present invention, as shown in FIG. Figure 1 As shown, a method for detecting the compressive strength of wood provided by one embodiment of the present invention includes the following steps:

[0031] Select a wood sample 10 and record the initial height H of the wood sample 10;

[0032] Limiting the bottom of the wood sample 10 and limiting the sides of the wood sample 10;

[0033] After the wood sample 10 is installed with limited space, pressure is applied to the top of the wood sample 10 , and the compression stroke D, pressure load F, and pressure area A during the pressure application are recorded.

[0034] Specifically, by limiting the bottom of the wood sample 10 to maintain its base, the wood sample 10 is ensured not to move axially toward the direction of pressure when pressure is applied from the top, allowing it to fully absorb the pressure acting on the wood sample 10. Simultaneously, the circumferential limits of the wood sample 10 are also imposed to ensure that the wood sample 10 does not expand or split radially, circumferentially, or in directions angled to its axis during the top pressure test, fully simulating the installation conditions of the wood in actual working conditions. This effectively simulates the actual pressure-bearing state of the wood in actual use, thereby accurately reflecting the compressive properties of the wood. Furthermore, recording the initial height of the wood sample 10, as well as the compression stroke, applied load, and applied area during pressure application, facilitates the subsequent calculation of the compressive strength of the wood sample 10, obtaining a compressive strength value, and facilitating the plotting of a graph. In other words, the wood compressive strength testing method provided in this embodiment, by limiting the bottom and sides of the wood sample 10, ensures that the wood sample 10 is not subject to axial and radial displacement limits when subjected to pressure. In this way, not only is the pressure state of wood in actual working conditions simulated, ensuring that the wood sample 10 can fully withstand the applied pressure to make the most realistic changes, but it is also ensured that the wood sample 10 will not easily crack, split, fall over, and other problems, thereby improving the detection accuracy.

[0035] The following is a more detailed description of the wood compressive strength testing method according to the above steps.

[0036] In some embodiments, wood to be used for the shock absorber is selected, and then a portion is cut from the wood, and the portion is cut and repaired to serve as the wood sample 10. In this way, it can be ensured that the properties of the wood sample 10 are the same as those of the original wood, and precisely because the wood sample 10 is selected instead of all the wood, it is easier to install the relative testing machine and conduct the experiment. In a preferred embodiment, the wood sample 10 is in the shape of a cubic column. Such a setting facilitates the positioning of the sides and bottom of the wood sample 10. After the wood sample 10 is selected, the initial height of the wood sample 10 needs to be recorded as H. The initial height of the wood sample 10 is recorded to facilitate comparison with the changes after the subsequent pressure application.

[0037] In some embodiments, after selecting the wood sample 10, the wood sample 10 needs to be installed in the limiting base 30, and during installation, the installation posture of the wood sample 10 needs to be determined so that the longitudinal grain 11 of the wood sample 10 extends along the height direction of the wood sample 10 to meet the test basis of the compressive strength of the wood sample 10 along the longitudinal grain 11. The limiting base 30 includes a bottom plate 31 and side plates 32 installed on the bottom plate 31. The side plates 32 and the bottom plate 31 together enclose an installation space for accommodating the wood sample 10. When the wood sample 10 is installed in the installation space, the bottom of the wood sample 10 is placed on the bottom plate 31, and the side plates 32 surround the wood sample 10. The height of the side plates 32 is greater than the height of the wood sample 10.

[0038] Because the wood specimens 10 vary in size, the length and width of the limiting base 30 along the wood specimen 10 are larger than the wood specimen 10 to accommodate a variety of different wood specimens 10. Therefore, when the wood specimen 10 is installed in the limiting base 30, a gap exists between the sidewalls of the wood specimen 10 and the sidewalls of the limiting base 30. In this case, the size of this installation space needs to be adjusted so that the sidewalls of the limiting base 30 exert a pressing force against the sidewalls of the wood specimen 10 to ensure that the wood specimen 10 is properly positioned.

[0039] In some embodiments, a cubical-shaped wood sample 10 is used as an example for illustration. The wood sample 10 has a first side wall and a second side wall that are perpendicular and adjacent to each other, and the position limiting base 30 has a first side panel and a second side panel that are perpendicular and adjacent to each other. When adjusting the size of the installation space to achieve side position limiting, the first side wall is in close contact with the first side panel on the same side, and the second side wall is in close contact with the second side panel on the same side, that is, the first side wall and the second side wall are used as a reference. In this way, there are gaps between the side wall opposite the first side wall and the side panel 32 on the same side, and between the side wall opposite the second side wall and the side panel 32 on the same side. By filling these gaps, the side position limiting of the wood sample 10 can be achieved.

[0040] In one specific embodiment, a stopper 40 is installed in the aforementioned gap. Specifically, by stacking the stoppers 40, multiple stoppers 40 can be used to fill the gap. Because the upper side plate 32 of the limiting base 30 is fixed in position, the side position can be limited by stacking the stoppers 40 until no new stoppers 40 can be installed. The cross-sectional area of ​​the stoppers 40 along the height of the wood specimen 10 is greater than the cross-sectional area of ​​the wood specimen 10 itself, ensuring uniform force on the wood specimen 10.

[0041] In another specific embodiment, a stopper 40 is installed in the above-mentioned gap, and a locking post 50 is used to pass through the side plate 32 on the same side to abut against the stopper 40, and the locking post 50 is threadedly connected to the side plate 32. The locking post 50 is screwed into the opposite side plate 32 to push the stopper 40 toward the wood sample 10 until the stopper 40 is pressed against the side wall of the wood sample 10 to achieve side limit. There are multiple locking posts 50, and the multiple locking posts 50 are arranged at intervals along the circumference of the stopper 40, and each locking post 50 corresponds to a threaded hole on the side plate 32. When screwing in multiple locking posts 50, an automatic thread locking machine can be used to improve work efficiency.

[0042] In yet another specific embodiment, a side panel 32 opposite the first side panel and a side panel 32 opposite the second side panel are both slidably connected to the bottom panel 31, and a drive member is installed on the side of these two side panels 32 facing away from the installation space. When the wood sample 10 is installed in the installation space and is positioned relative to the first and second side panels, the drive member is activated to push the corresponding side panel 32 toward the side closer to the wood sample 10 to achieve lateral positioning. Each side panel 32 has an independent drive member, which can be a pneumatic cylinder or an electric drive. The drive end of the drive member is connected to the middle of the side panel 32 to ensure uniform force.

[0043] In some embodiments, after the wood specimen 10 has been positioned at the bottom and sides, a portion of the top of the wood specimen 10 is selected as the pressure site. In other words, the actual pressure site on the wood specimen 10 in this embodiment is not the entire wood specimen 10, but rather a localized portion. Precisely because of the localized pressure, deformation occurs only in a localized portion of the wood specimen 10 along its own height, not across the entire wood specimen 10. This further mitigates the issue of wood easily collapsing during pressure application. Furthermore, this setup simulates the actual situation of wood being subjected to localized compression in actual use, improving test accuracy.

[0044] Furthermore, the pressure-applying portion is located in the middle of the wood specimen 10, and the axis of the pressure-applying portion coincides with the mounting axis of the wood specimen 10, which is the central axis of the wood specimen 10 after the specimen is mounted in a restricted position. Specifically, because the pressure-applying portion is located in the middle of the wood specimen 10, the deformation of the pressure-applying portion is kept away from the sidewalls of the wood specimen 10, thereby alleviating the problem of cracks or splitting on the sides of the wood specimen 10. Furthermore, by defining the axis of the pressure-applying portion and the mounting axis of the wood specimen 10, the distance between the edge of the pressure-applying portion and the sidewalls of the wood specimen 10 is equal. This ensures that when pressure is applied to the wood specimen 10, the forces associated with the pressure-applying portion are uniform across the sidewalls of the wood specimen 10. Furthermore, the cross-sectional area of ​​the pressure-applying portion accounts for 25% to 70% of the cross-sectional area of ​​the wood specimen 10. This numerical definition simulates the actual situation of wood undergoing localized compression in actual use, improving test accuracy. As a preferred embodiment, the cross-sectional area of ​​the pressure-applying portion accounts for 25%, 55%, or 70% of the cross-sectional area of ​​the wood specimen 10. The cross-sectional area mentioned here refers to the cross-sectional area perpendicular to the axis of the wood sample 10 .

[0045] In some embodiments, a corresponding pressure head 20 is selected based on the determined pressure location. The pressure area of ​​the pressure head 20 is equal to the cross-sectional area of ​​the pressure location. The pressure area of ​​the pressure head 20 is denoted as A. After selecting the pressure head 20, the pressure head 20 is placed on the wood sample 10 at a location that coincides with the pressure location. The limiting base 30 and the pressure head 20 are fixed relative to the testing machine. After the fixing is completed, the testing machine is started to drive the pressure head 20 downward to compress the wood sample 10. In a preferred embodiment, the compression rate of the pressure application action of the testing machine during operation is 4 mm / min-6 mm / min. By limiting the compression rate, the pressure head 20 is ensured to move downward to compress the wood sample 10 at a relatively slow speed, which not only ensures that the wood sample 10 has an appropriate pressure-bearing process but also effectively avoids impacts on the wood sample 10 at a higher speed. In a specific embodiment, the compression rate of the testing machine during operation is 4 mm / min, 5 mm / min, or 6 mm / min. In a preferred embodiment, the compression rate of the testing machine during operation is 5 mm / min.

[0046] In some embodiments, after the compression is completed, the compression stroke D of the pressure head 20 driven by the testing machine is recorded, and the compression load F applied by the testing machine through the pressure head 20 is recorded. Given the initial height H and the compression area A of the wood specimen 10, the strength parameter of the wood specimen 10 is calculated according to the formula S1 = F / A, and the engineering strain parameter of the wood specimen 10 is calculated according to the formula S2 = D / H. Throughout the compression process, the initial height and compression area of ​​the wood specimen 10 are constants, while the compression stroke and compression load are variables. Therefore, based on the changes in the compression stroke and compression load, a stress-strain curve of the wood specimen 10 during the compression process can be plotted for easy observation.

[0047] It should be noted that the testing machine used to test the compressive strength of wood is a mature existing technology, with a built-in force sensor to detect the compressive load and a built-in form sensor to detect the compression stroke. Of course, the compression stroke can also be obtained from a scale.

[0048] In some other embodiments, because wood is subject to varying ambient temperatures in actual operation, it is necessary to test the strength of the wood at different temperatures. Therefore, the method for testing the compressive strength of wood further includes placing the wood sample 10 in a temperature environment, adjusting the temperature to which the wood sample 10 is subjected, and then performing a compressive test on the top of the wood sample 10 to test the strength of the wood sample 10 in the temperature environment. Furthermore, because the temperature of the temperature environment is adjustable, the temperature can be adjusted to test the strength of the wood sample 10 in different temperature environments, thereby observing the effects of temperature changes on the wood. In this way, based on the changes in the wood's response to different temperature environments, a more suitable wood can be selected.

[0049] During actual operation, a thermocouple 60 is first installed on the wood sample 10, and the other end of the thermocouple 60 is connected to the controller of the temperature detection box. The temperature of the wood sample 10 is detected by the thermocouple 60 and fed back to the controller. After analysis and processing by the controller, the display screen on the temperature detection box displays the result. Then, the limiting base 30 containing the wood sample 10 is installed in the temperature detection box, and a support column is connected to the bottom of the limiting base 30. The support column extends from the bottom end of the temperature detection box to be fixed to the testing machine. The pressure head 20 is placed on the pressure application part of the wood sample 10, and the top of the pressure head 20 extends from the top of the temperature detection box to be fixed to the testing machine. After the limiting base 30 and the pressure head 20 are assembled relative to the testing machine, the temperature in the temperature detection box is adjusted to the target temperature and kept at this temperature for a preset time. After the insulation is completed, the testing machine is started to start applying pressure.

[0050] The purpose of keeping the wood sample 10 in the temperature environment is to ensure that the temperature of the wood sample 10 is substantially uniform across the wood sample 10 so as to truly reflect the changes in the temperature environment of the wood sample 10. As a preferred embodiment, the insulation time is two hours.

[0051] In the above temperature environment, the steps after applying pressure to the wood sample 10 are the same as those in the above non-temperature environment, and therefore will not be described in detail here.

[0052] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0053] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A method for detecting the compressive strength of wood, characterized in that: The method for detecting the compressive strength of wood comprises the following steps: Selecting a wood sample (10) and recording an initial height H of the wood sample (10); Limiting the bottom of the wood sample (10) and limiting the circumference of the wood sample (10); After the wood sample (10) is installed with limited space, pressure is applied to the top of the wood sample (10), and the compression stroke D, the pressure load F, and the pressure area A during the pressure application are recorded; When limiting the circumference of the wood sample (10), the wood sample (10) is placed in a limiting base (30), and the size of the installation space of the limiting base (30) is adjusted according to the distance between the wood sample (10) and the side wall of the limiting base (30), so that the side wall of the limiting base (30) generates a pressing force relative to the side wall of the wood sample (10); When adjusting the size of the installation space of the limiting base (30), a stopper (40) is added between the side wall of the wood sample (10) and the side wall of the limiting base (30) until no new stopper (40) can be added or the stopper (40) is moved until the stopper (40) is pressed tightly against the side wall of the wood sample (10); or When adjusting the size of the installation space of the limiting base (30), the side wall of the limiting base (30) is moved to cause the side wall of the limiting base (30) to be pressed tightly against the side wall of the wood sample (10); Before performing the limited installation of the wood sample (10), the installation posture of the wood sample (10) is adjusted so that the longitudinal grain (11) on the wood sample (10) extends from the top of the wood sample (10) to the bottom of the wood sample (10); The wood sample (10) is placed in a temperature environment, the temperature to which the wood sample (10) is subjected is adjusted, and then a pressure test is performed on the top of the wood sample (10).

2. The method for detecting the compressive strength of wood according to claim 1, wherein: Before performing a pressure test on the top of the wood sample (10), a top portion of the wood sample (10) is selected as a pressure application location.

3. The method for detecting the compressive strength of wood according to claim 2, wherein: The pressure-applying portion is located in the middle of the wood sample (10), and the axis of the pressure-applying portion coincides with the installation axis of the wood sample (10), and the installation axis is the central axis of the wood sample (10) after the limiting installation is completed.

4. The method for detecting the compressive strength of wood according to claim 2, wherein: The cross-sectional area of ​​the pressure-applying portion accounts for 25%-70% of the cross-sectional area of ​​the wood sample (10).

5. The method for detecting the compressive strength of wood according to claim 1, wherein: The wood sample (10) is in the shape of a cubic column, and the wood sample (10) has a first side wall and a second side wall arranged at an angle; When adjusting the size of the installation space of the limiting base (30), the first side wall and the second side wall are respectively closely attached to the side walls corresponding to the limiting base (30) as an adjustment reference.

6. The method for detecting the compressive strength of wood according to claim 1, wherein: After recording the compression stroke D and the applied pressure load F, the strength S1=F / A of the wood sample (10) is obtained based on the applied pressure area A and the applied pressure load F, and the engineering strain S2=D / H of the wood sample (10) is obtained based on the initial height H and the compression stroke D of the wood sample (10).

Images