A composite material fatigue testing device

Abstract

The invention discloses a composite material fatigue detection device, comprising: a base, which is constructed as a platform with a mounting groove structure; a mounting plate, which is arranged above the base; a striker, which is arranged on the mounting plate and is used to strike the composite material to be tested; a clamping block, which is arranged in the mounting groove; a guide plate assembly, which is arranged below the clamping block; and a cylinder, which is arranged below the guide plate assembly. The composite material to be tested is placed on the guide plate assembly and then moved below the clamping block, and the cylinder pushes the composite material on the guide plate assembly onto the clamping block. After the composite material detection is completed, the composite material on the clamping block falls onto the guide plate assembly and is then moved out of the mounting groove. The invention has the advantage of convenient loading and unloading.

Description

Technical Field

[0001] The invention belongs to the technical field of detection equipment, and in particular relates to a composite material fatigue detection equipment. Background Art

[0002] Carbon-carbon composites are carbon-matrix composites reinforced with carbon fibers and their fabrics. They have the advantages of low density, high strength, high specific modulus, high thermal conductivity, low expansion coefficient, good friction performance, good thermal shock resistance, and high dimensional stability. They are one of the few alternative materials used above 1650°C today, and the highest theoretical temperature is as high as 2600°C. Therefore, they are considered to be one of the most promising high-temperature materials. Fatigue fracture toughness is an important parameter of the fracture performance of pyrolytic carbon materials. It characterizes the ability of materials to resist crack propagation and brittle fracture, and is generally expressed in KIC. Accurately testing the fatigue fracture toughness value of materials and studying the factors that affect the fatigue fracture toughness of materials can clarify and improve the fracture performance of pyrolytic carbon, and is also of great significance to the damage tolerance and life prediction procedures of carbon-carbon composites.

[0003] At present, material fatigue resistance testing equipment mainly performs reciprocating pressurization on the surface of the material to make it deform under force, so as to simulate the working state of the material in use through several impacts. However, when testing composite materials, frequent loading and unloading operations are required. In order to make the test results more reliable, the composite materials need to be well fixed, which causes the inconvenience of loading and unloading the composite materials, making the testing operation of the composite materials inconvenient to operate. Summary of the invention

[0004] The content of this application is used to introduce concepts in a brief form, which will be described in detail in the detailed implementation section below. The content of this application is not intended to identify the key features or essential features of the technical solution claimed for protection, nor is it intended to limit the scope of the technical solution claimed for protection.

[0005] In order to overcome the deficiencies of the prior art, the present invention provides a composite material fatigue detection device.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a composite material fatigue detection equipment, comprising: a base, which is constructed as a platform with a mounting groove structure; a mounting plate, which is arranged above the base; a collision rod, which is arranged on the mounting plate and is used to impact the composite material to be tested; a clamping block, which is arranged in the mounting groove; a guide plate assembly, which is arranged below the clamping block; a cylinder, which is arranged below the guide plate assembly; the composite material to be tested is placed on the guide plate assembly and then moved to the bottom of the clamping block, and the cylinder pushes the composite material on the guide plate assembly onto the clamping block; after the composite material detection is completed, the composite material on the clamping block falls onto the guide plate assembly and is removed from the mounting groove.

[0007] Furthermore, the composite material fatigue detection equipment also includes: a mounting block, arranged at the bottom of the clamping block; a fixed block, arranged on the mounting block; a first movable groove for the fixed block to move is provided on the mounting block, and the mounting block forms a fixed groove at the bottom of the clamping block for placing the composite material.

[0008] Furthermore, the composite material fatigue detection equipment also includes: a first connecting spring, connecting the fixed block to the first movable groove; a limit block, fixing the fixed block in the first movable groove; a first push block, arranged in the fixed groove; when the composite material to be tested enters the fixed groove, the first push block is pushed to move, and the first push block drives the limit block to move so that the limit block is disengaged from the fixed block.

[0009] Furthermore, the composite material fatigue detection equipment also includes: a support block, arranged on the fixed block; a first protrusion, arranged on the support block; a first push rod, passed through the fixed block; a second push block, arranged on the first push rod; a cavity is provided on the fixed block, and the first protrusion and the first push rod are both passed through the cavity.

[0010] Furthermore, the composite material fatigue detection equipment also includes: a guide rod, which is arranged on the inner wall of the first movable groove; an electromagnet, which is arranged in the first movable groove; a guide groove matching the guide rod is provided on the first push rod, and the guide rod is inserted into the guide groove, and the guide rod cannot escape from the guide groove.

[0011] Furthermore, the composite material fatigue detection equipment also includes: a convex strip, arranged on the fixed block; a flap, arranged on the convex strip; a receiving groove corresponding to the support block is arranged on the top of the first movable groove, the width of the receiving groove is smaller than the width of the first movable groove, and the width of the support block is smaller than the width of the convex strip; a limiting groove corresponding to the limiting block is arranged on the convex strip, and the flap is rotatably connected to the inner wall of the limiting groove, and the flap can only rotate toward the inside of the limiting groove.

[0012] Furthermore, the composite material fatigue detection equipment also includes: a ratchet plate, arranged in the first movable groove; a movable rod, arranged on one side of the ratchet plate; a second protrusion, arranged on the ratchet plate; a third protrusion, arranged on the movable rod; a second movable groove for accommodating the ratchet plate and the movable rod is provided on the inner wall of the first movable groove, and the movable rod is made of ferromagnetic material.

[0013] Furthermore, the composite material fatigue detection equipment also includes: a first connecting block, arranged on the base; a second connecting block, arranged on the clamping block; a second connecting spring, used to connect the first connecting block and the second connecting block; a first mounting frame, arranged on the base for placing the first connecting block; and a second mounting frame, arranged on the clamping block for placing the second connecting block.

[0014] Furthermore, the guide plate assembly includes: a first guide plate, which is inserted into the mounting groove; a second guide plate, which is arranged in the mounting groove; the first guide plate and the second guide plate are connected to each other, and the first guide plate is arranged at an angle; a feed port is provided on one side wall of the mounting groove, and a discharge port is provided on the other side wall.

[0015] Furthermore, the guide plate assembly also includes: a first connecting rod, one end of the second guide plate is rotatably connected to the first connecting rod; a stopper is arranged on the second guide plate; a push plate is arranged on the piston rod of the cylinder; the second guide plate is provided with a through hole corresponding to the push plate and a first through groove for the stopper to move, and when the push plate descends, the stopper is pushed to move to the bottom of the first through groove, and the second guide plate rotates around the first connecting rod.

[0016] The benefits of the present invention lie in that: the composite material to be tested is placed on the guide plate assembly and then moved to the bottom of the clamping block, and the cylinder pushes the composite material on the guide plate assembly onto the clamping block; after the composite material inspection is completed, the composite material on the clamping block falls onto the guide plate assembly and is then removed from the mounting groove, thereby facilitating the loading and unloading of the composite material. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The illustrative embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application.

[0018] In addition, throughout the drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and that the components and elements are not necessarily drawn to scale.

[0019] In the attached picture:

[0020] Figure 1 It is a schematic structural diagram of a composite material fatigue detection device in one embodiment of the present invention.

[0021] Figure 2 for Figure 1 A cross-sectional view of a clamping block of a composite material fatigue testing apparatus in the illustrated embodiment.

[0022] Figure 3 for Figure 2 Enlarged view of point A in .

[0023] Figure 4 for Figure 1 A cross-sectional view of a second movable slot of the composite material fatigue testing device in the illustrated embodiment.

[0024] Figure 5 for Figure 4 Enlarged view of point B in .

[0025] Figure 6 for Figure 4 Enlarged view of point C in the figure.

[0026] Figure 7 for Figure 1A cross-sectional view of a second guide plate of the composite material fatigue testing apparatus in the illustrated embodiment.

[0027] The meanings of the reference numerals in the figures are as follows:

[0028] 101, base; 102, mounting plate; 103, clamping block; 104, first mounting frame; 105, second mounting frame; 106, first connecting block; 107, second connecting block; 108, second connecting spring; 109, first guide plate; 110, stop rod; 110, mounting column; 1101, third connecting rod; 112, striker rod; 113, second guide plate; 114, cylinder; 115, push plate; 117, fixing block; 1171, convex strip; 1172, first connecting spring; 118, support block; 1181, first convex block; 119, The first push rod; 1191, the second push block; 120, the guide rod; 121, the limit block; 122, the first push block; 123, the second connecting rod; 1231, the first return spring; 124, the flap; 125, the mounting block; 126, the ratchet plate; 1261, the second protrusion; 1262, the second return spring; 127, the movable rod; 1271, the third protrusion; 1272, the third return spring; 128, the guide rail; 129, the stop block; 1291, the protruding plate; 1292, the extension plate; 1293, the fourth return spring; 130, the support spring. DETAILED DESCRIPTION

[0029] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not intended to limit the scope of protection of the present disclosure.

[0030] It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.

[0031] It should be noted that the concepts such as "first" and "second" mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0032] It should be noted that the modifications of "one" and "plurality" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0033] The names of the messages or information exchanged between multiple devices in the embodiments of the present disclosure are only used for illustrative purposes and are not used to limit the scope of these messages or information.

[0034] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0035] like Figure 1-7 As shown, a composite material fatigue detection equipment includes a base 101, a mounting plate 102, a striker 112, a clamping block 103, a guide plate assembly and a cylinder 114; the base 101 is constructed as a platform with a mounting groove structure; the mounting plate 102 is arranged above the base 101; the striker 112 is arranged on the mounting plate 102 for striking the composite material to be tested; the clamping block 103 is arranged in the mounting groove; the guide plate assembly is arranged below the clamping block 103; the cylinder 114 is arranged below the guide plate assembly; the composite material to be tested is placed on the guide plate assembly and then moved to below the clamping block 103, and the cylinder 114 pushes the composite material on the guide plate assembly onto the clamping block 103; after the composite material detection is completed, the composite material on the clamping block 103 falls onto the guide plate assembly and is removed from the mounting groove.

[0036] The mounting plate 102 is connected to the base 101 through a connecting column, and the bottom of the mounting plate 102 is slidably connected to the mounting column 110, and the mounting column 110 is provided with a third movable groove, and the impact rod 112 is arranged in the third movable groove. The impact rod 112 can achieve up and down reciprocating movement through a cam mechanism, thereby repeatedly applying pressure on the composite material; the mounting column 110 can drive the impact rod 112 to move, thereby changing the position where the impact rod 112 hits the composite material, so as to provide a variety of test data.

[0037] A mounting block 125 is provided at the bottom of the clamping block 103, and the mounting block 125 is arranged at the bottom of one end of the clamping block 103. The mounting block 125 and the bottom of the clamping block 103 form a fixed groove, and a first movable groove is provided on the mounting block 125, and a fixed block 117 is provided in the first movable groove. The fixed block 117 is connected to the first movable groove through a first connecting spring 1172, and a convex strip 1171 is provided on the fixed block 117; a fourth movable groove is provided at the top of the first movable groove, and a limit block 121 is provided in the fourth movable groove, and a limit groove corresponding to the limit block 121 is provided on the convex strip 1171; a fifth movable groove is provided at the bottom of the clamping block 103, and a connecting cavity connecting the fourth movable groove and the fifth movable groove is also provided on the clamping block 103; a first push block 122 is provided in the fifth movable groove, and the first push block 122 is connected to the limit block 121 through a second connecting rod 123, and a first reset spring 1231 is provided on the second connecting rod 123.

[0038] A cavity is provided on the fixed block 117, a support block 118 is provided on the top of the fixed block 117, a first protrusion 1181 is provided on the bottom of the support block 118, and the first protrusion 1181 is penetrated in the cavity; a first push rod 119 is provided in the first movable cavity, the first push rod 119 is penetrated in the cavity, a second push block 1191 is provided at one end of the first push rod 119, a first inclined surface is provided on the second push block 1191, a guide rod 120 is provided on the inner wall of the first movable groove, a guide groove corresponding to the guide rod 120 is provided on the first push rod 119, the guide rod 120 is penetrated in the guide groove, and the guide rod 120 cannot fall out of the guide groove; a receiving groove corresponding to the support block 118 is provided on the top of the first movable groove, the width of the receiving groove is smaller than the width of the first movable groove, and the width of the support block 118 is smaller than the width of the convex strip 1171.

[0039] An electromagnet is provided in the first movable groove, and the support block 118 is made of ferromagnetic material; a flap 124 is rotatably connected to the side wall of the limiting groove, and the bottom end of the flap 124 is rotatably connected to the inner wall of the limiting groove, and the flap 124 can only rotate into the limiting groove; a second movable groove is provided on the inner wall of the first movable groove, and a ratchet plate 126 and a movable rod 127 are provided in the second movable groove, a second protrusion 1261 is provided on the ratchet plate 126, and a third protrusion 1271 is provided on the movable rod 127, a second return spring 1262 is provided on the ratchet plate 126, and a third return spring 1272 is provided at one end of the movable rod 127, and the movable rod 127 is made of ferromagnetic material, and when the second protrusion 1261 and the third protrusion 1271 are aligned, the ratchet plate 126 contacts the side wall of the fixed block 117, and the fixed block 117 can only move out of the first movable groove under the action of the ratchet plate 126.

[0040] A first mounting frame 104 is provided on the inner wall of the mounting groove, a second mounting frame 105 is provided on the clamping block 103, a first connecting block 106 is provided in the first mounting frame 104, a second connecting block 107 is provided in the second mounting frame 105, and the first connecting block 106 and the second connecting block 107 are connected together by a second connecting spring 108; a guide rail 128 is provided on the inner wall of the mounting groove, the clamping block 103 is provided on the guide rail 128 and can move along the guide rail 128; the first connecting block 106, the second connecting block 107 and the second connecting spring 108 are a whole, and a tension indicator is provided on the mounting frame, and the first connecting block 106, the second connecting block 107 and the second connecting spring 108 can be replaced as a whole according to the composite material to be tested, so that it corresponds to the composite material to be tested, so as to better detect the composite material.

[0041] A feed port is provided on one side wall of the installation groove, and a discharge port is provided on the other side wall. The guide plate assembly includes a first guide plate 109 and a second guide plate 113. The first guide plate 109 is inserted into the feed port, and the second guide plate 113 is inserted into the discharge port. The first guide plate 109 is tilted in the feed port, and the first guide plate 109 and the second guide plate 113 are connected end to end. A first connecting rod is provided at the bottom of the installation groove, and the first connecting rod is provided at the end of the second guide plate 113, that is, the connection between the first guide plate 109 and the second guide plate 113. One end of the second guide plate 113 is rotatably connected to the first connecting rod. A supporting spring is provided at the bottom of the second guide plate 113. Spring 130, the support spring 130 is against the bottom surface of the mounting groove; the second guide plate 113 is provided with a through hole and a first through groove, the through hole is provided with a push plate 115, the push plate 115 is connected to the piston rod of the cylinder 114, the first through groove is provided with a stopper 129, the top side wall of the stopper 129 is provided with a convex plate 1291, the side wall of the first through groove is provided with a groove corresponding to the convex plate 1291, the bottom of the stopper 129 is provided with an extension plate 1292, the extension plate 1292 is partially located below the push plate 115, the extension plate 1292 is provided with a fourth reset spring 1293, and the top of the fourth reset spring 1293 is fixedly connected to the second guide plate 113.

[0042] A blocking rod 110 is provided on the first guide plate 109, and a third connecting rod 1101 is provided at the bottom of the blocking rod. A second through groove for the third connecting rod 1101 to move is provided on the first guide plate 109, and a second push rod is provided at the bottom of the third connecting rod 1101. The second push rod is moved according to the composite material to be tested, so as to adjust the position of the blocking rod 110, so as to position the composite material and move the composite material to the bottom of the clamp 103 in a specified state.

[0043] When testing the composite material, put the composite material in from the feed inlet, place the composite material on the first guide plate 109 and move along the first guide plate 109, move the composite material from the first guide plate 109 to the second guide plate 113, the composite material rests on the stopper 129, the cylinder 114 pushes the push plate 115 to move upward, the push plate 115 pushes the composite material on the second guide plate 113 to move upward, the composite material is pushed into the fixed groove, the composite material rests on the first push block 122 to push the first push block 122 to move, the first push block 122 drives the limit block 121 to move out of the limit groove, the first connecting spring 1172 pushes the fixed block 117 to extend out of the first movable groove, the first push rod 119 moves with the fixed block 117 relative to the guide rod 120, and the guide rod 120 moves to the guide groove After the composite material is in the mouth position, the fixed block 117 moves relative to the first push rod 119, and the first protrusion 1181 abuts against the first push block 122. The first push block 122 pushes the first protrusion 1181 to move upward, and the support block 118 moves upward relative to the fixed block 117. The support block 118 abuts against the bottom surface of the composite material to clamp the compliant material on the bottom surface of the clamping block 103. Under the action of the ratchet plate 126, the fixed block 117 cannot move into the first movable groove, providing a reliable supporting force for the support block 118 to ensure the fixing effect of the composite material; the convex strip 1171 abuts against the inner wall of the first movable groove to ensure the supporting effect of the fixed block 117 on the composite material; after the composite material is fixed, the cylinder 114 drives the push plate 115 to descend, and the impact rod 112 hits the composite material to detect the composite material.

[0044] After the composite material inspection is completed, the push plate 115 moves downward to push the extension plate 1292, the stopper 129 moves to the bottom of the first through groove, and the convex plate 1291 abuts against the bottom surface of the groove to drive one end of the second guide plate 113 to move downward, and the second guide plate 113 rotates around the connection point on the first connecting rod to form an inclined plane, and the electromagnet is energized to generate a magnetic force to attract the movable rod 127 to move toward one end of the second movable groove, and the second protrusion 1261 and the third protrusion 1271 are staggered. The second return spring 1262 pulls the ratchet plate 126 into the second movable groove and disengages from the fixed block 117. The fixed block 117 enters the first movable groove under the action of the magnetic force, and the support block 118 moves with the fixed block 117 into the accommodating groove After the support block 118 moves relative to the first push rod 119, the first push block 122 is staggered with the first protrusion 1181, and the support block 118 moves downward after losing support; after the support block 118 enters the first movable groove, the composite material falls on the second guide plate 113, and the tested composite material moves out from the discharge port along the inclined surface formed by the second guide plate 113, and the tested composite material is recovered; when the flap 124 moves and abuts against the limit block 121, the flap 124 rotates around the connection point so that the limit block 121 enters the limit groove, and after the limit block 121 enters the limit groove, the electromagnet is powered off, and the limit block 121 abuts against the flap 124 to fix the fixed block 117 in the first movable groove.

[0045] The above descriptions are only some preferred embodiments of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present disclosure is not limited to the technical solutions formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the embodiments of the present disclosure.

Claims

1. A composite material fatigue detection device, comprising: A base is constructed as a platform having a mounting groove structure; A mounting plate, arranged above the base; A striker rod is arranged on the mounting plate and is used to strike the composite material to be tested; characterized in that: the composite material fatigue testing equipment also includes: A clamping block, arranged in the mounting groove; A guide plate assembly is arranged below the clamping block; A cylinder, disposed below the guide plate assembly; The composite material to be tested is placed on the guide plate assembly and then moved to the bottom of the clamping block, and the cylinder pushes the composite material on the guide plate assembly onto the clamping block; after the composite material test is completed, the composite material on the clamping block falls onto the guide plate assembly and then is removed from the mounting groove; The composite material fatigue detection device further comprises: a mounting block, which is arranged at the bottom of the clamping block; a fixed block, which is arranged on the mounting block; the mounting block is provided with a first movable groove for the fixed block to move, and the mounting block forms a fixed groove for the composite material to be placed at the bottom of the clamping block; The composite material fatigue detection device further includes: a first connecting spring, connecting the fixed block to the first movable groove; a limiting block, fixing the fixed block in the first movable groove; a first pushing block, arranged in the fixed groove; when the composite material to be tested enters the fixed groove, the first pushing block is pushed to move, and the first pushing block drives the limiting block to move so that the limiting block is disengaged from the fixed block; The composite material fatigue detection device further includes: a support block, which is arranged on the fixed block; a first convex block, which is arranged on the support block; a first push rod, which is passed through the fixed block; a second push block, which is arranged on the first push rod; a cavity is arranged on the fixed block, and the first convex block and the first push rod are both passed through the cavity; The cam is provided with a first end for receiving the first and second ends of the guide plate, and the second end for receiving the first and second ends of the guide plate are connected with the cam at the bottom of the cam. A baffle rod is arranged on the first guide plate, a third connecting rod is arranged at the bottom of the baffle rod, a second through slot for the third connecting rod to move is arranged on the first guide plate, and a second push rod is arranged at the bottom of the third connecting rod.

2. The composite material fatigue detection device according to claim 1, characterized in that: The composite material fatigue detection equipment also includes: a guide rod, which is arranged on the inner wall of the first movable groove; an electromagnet, which is arranged in the first movable groove; a guide groove matching with the guide rod is provided on the first push rod, the guide rod is inserted into the guide groove, and the guide rod cannot escape from the guide groove.

3. The composite material fatigue detection device according to claim 1, characterized in that: The composite material fatigue detection equipment also includes: a convex strip, which is arranged on the fixed block; a flap, which is arranged on the convex strip; a receiving groove corresponding to the support block is arranged on the top of the first movable groove, the width of the receiving groove is smaller than the width of the first movable groove, and the width of the support block is smaller than the width of the convex strip; a limiting groove corresponding to the limiting block is arranged on the convex strip, the flap is rotatably connected to the inner wall of the limiting groove, and the flap can only rotate toward the inside of the limiting groove.

4. The composite material fatigue detection device according to claim 1, characterized in that: The composite material fatigue detection equipment also includes: a ratchet plate, arranged in the first movable groove; a movable rod, arranged on one side of the ratchet plate; a second protrusion, arranged on the ratchet plate; a third protrusion, arranged on the movable rod; a second movable groove for accommodating the ratchet plate and the movable rod is provided on the inner wall of the first movable groove, and the movable rod is made of ferromagnetic material.

5. The composite material fatigue detection device according to claim 1, characterized in that: The composite material fatigue detection equipment also includes: a first connecting block, arranged on the base; a second connecting block, arranged on the clamping block; a second connecting spring, used to connect the first connecting block and the second connecting block; a first mounting frame, arranged on the base for placing the first connecting block; and a second mounting frame, arranged on the clamping block for placing the second connecting block.

6. The composite material fatigue detection device according to claim 1, characterized in that: The guide plate assembly includes: a first guide plate, which is inserted into the mounting groove; a second guide plate, which is arranged in the mounting groove; the first guide plate and the second guide plate are connected to each other at the first position, and the first guide plate is arranged at an angle; a feed port is provided on one side wall of the mounting groove, and a discharge port is provided on the other side wall.

7. The composite material fatigue detection device according to claim 6, characterized in that: The guide plate assembly also includes: a first connecting rod, one end of the second guide plate is rotatably connected to the first connecting rod; a stopper is arranged on the second guide plate; a push plate is arranged on the piston rod of the cylinder; the second guide plate is provided with a through hole corresponding to the push plate and a first through groove for the movement of the stopper, and when the push plate descends, it pushes the stopper to move to the bottom of the first through groove, and the second guide plate rotates around the first connecting rod.

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