A tensile test setup for countersunk head threaded fasteners.
Patent Information
- Application Number
- TR202522924U
- Authority / Receiving Office
- TR · TR
- Patent Type
- Utility models
- Current Assignee / Owner
- Filing Date
- 2025-12-30
- Publication Date
- 2026-08-21
- Estimated Expiration
- 2035-12-30
Abstract
Description
1 TARIFF A TENSILE TEST FOR COUNTERSUNK HEAD SCREW FASTENERS. mechanism Technical Area The invention relates to the field of mechanical testing systems in general, and specifically to countersunk head and screw systems. test setups for determining the tensile strength of fasteners It is related. These types of fasteners are particularly used in aviation, defense industry and high-end industries. It is used in structural assembly applications where reliability is required, The mechanical performance of the components was experimentally determined in accordance with standards. This needs to be verified. Countersunk head screw fittings, with their head geometry, are suitable for body 15 Due to the presence of both toothed and untoothed areas on its surface, it is a universal test. They are various in terms of being subjected to tensile testing by being directly connected to the machines. This presents challenges. These challenges include the occurrence of axial misalignment during testing, and the load... inability to transfer homogeneous energy to the fastener and test results This can lead to problems such as reduced repeatability. Therefore, the word 20 the subject is ensuring that tensile tests of fasteners can be reliably performed. For this, special test setups compatible with the geometric properties of the fastener are needed. It is heard. In this context, the invention relates to the performance of countersunk threaded fasteners during tensile testing, 25 the axial and controlled transfer of the load to the fastening element a tensile testing setup that can be used with universal testing machines It is related to the device described within the scope of the invention, with the head geometry of the connecting element. Based on the toothed structure located on the housing, the connecting element was tested during the testing process. It is structured in such a way as to subject it only to tensile load. 30 State of the Art Countersunk threaded fasteners are used especially in the aerospace and defense industries. used, has a high strength-to-weight ratio, tight geometric tolerances and 35 2 These are mechanical fasteners where functional reliability is critical. This type of fastener... Components include aircraft fuselage panels, wing and tail structures, sub-assemblies, and similar items. It is widely used in areas that are critical for safety. In practice, this Fasteners are manufactured according to specific standards; including countersunk head geometry, It has a cylindrical body and screw threads located on at least one section of the body. 5 In this context, different diameter and size combinations such as HL23-5 and HL23-6 are available on the market. Countersunk threaded fasteners are widely used. Hi-Lok Fasteners are a cornerstone of modern aircraft manufacturing and maintenance. The main reason for its widespread use in aviation is that it's used in parts like the aircraft fuselage and wings. Its key feature is that it provides a connection that is both very lightweight and extremely strong in critical structures. 10 It is used in the aviation and aerospace industry. The mechanical strength of these fasteners, especially tensile load their behavior experimentally within the scope of national and international standards Verification is required. Tensile tests must verify the elastic and plastic properties of the fastener. 15 It reveals the deformation behavior, fracture load, and fracture mode of the product. These tests are mandatory in terms of qualification and quality assurance. However, the conical head geometry of countersunk screw fittings The fact that these elements are in a uniform form and have toothed areas on the body makes them universal. This makes it difficult to test by connecting directly to the testing machines. 20 In the known state of the art, tensile tests are mostly performed on standard specimens or flat surfaces. It appears that this is accomplished using devices designed for body-mounted fasteners. In such arrangements, the load is often transferred from the body or head of the fastening element. It is being transferred over unsuitable flat surfaces; this situation causes problems during loading. 25 axial misalignment occurs, bending moments come into play, and the test element... This causes it to be subjected not only to tensile loads but also to unwanted lateral loads. The test data obtained as a result shows the actual tensile strength of the fastener. It may not fully reflect its durability. Especially in countersunk head threaded fittings, the conical structure of the head geometry Therefore, ensuring homogeneous load transfer from the head surface is a separate technical problem. It is formed. In known applications, the head has a suitable countersunk surface. If not supported, point contact will occur between the head and the test apparatus. This leads to local stress concentrations, premature damage, and connection failure during testing. 3 This can lead to the component breaking outside its designed fracture zone. This type of these situations negatively affect both the repeatability and reliability of the test results. It has an effect. In addition, a significant portion of known tensile testing setups consist of 5 different diameters and sizes. This requires the use of separate fittings for the fasteners. For example, Countersunk heads with similar geometry but different dimensions, such as HL23-5 and HL23-6. For testing screw fasteners, custom-sized tools are required for each dimension. They may need to be designed and manufactured. This increases costs and... This also reduces operational efficiency in testing processes. 10 Another problem encountered in the known state of the art is testing the fastener. It relates to the method of fastening during operation. Countersunk screw fasteners from the bottom end If the fastener cannot be securely and axially fixed, it will bear a tensile load. may tend to rotate underneath or unwanted load may be transmitted through the screw threads 15 These components can form. This situation makes test setups complex. or necessitates the use of additional fastening elements. In this context, regarding tensile tests of countersunk threaded fasteners: It is known that various test setups have been developed. However, the 20 in question A significant portion of the mechanisms are perfectly matched to the head geometry of the connecting element. It is not structured in such a way as to ensure that the load is distributed axially and homogeneously. This method ensures that the fastener is subjected to only tensile load during testing. allowing for adaptability to similar elements of different sizes. It has various limitations in this regard. Below are 25 that represent the state of the art. Some example setups are discussed within this scope. The useful code with the reference "CN201653796U" was found as a result of research conducted in the literature. The model shows the tensile strength of fasteners that are not in the standard tensile specimen form. It relates to a test fixture designed for use in experiments. The 30 in question... In the utility model, the upper and lower parts of the element to be tested must be in contact with each other. the head and body regions of the element are held by means of surfaces or half-bodies in which it is compressed within these gaps and subjected to tensile load The mechanism is described. This solution is particularly suitable for stud-type or flat fasteners. It offers a general-purpose coupling approach for head connection parts, and different tests 35 4 It aims for a multi-purpose structure that can be used in various types of applications. However, this type of concept is fundamental. in systems, the load of the conical head geometry specific to countersunk screw fittings in the transfer, a direct reference is not taken, the head surface has a suitable chamfer or taper It appears that the seating surface is not centered. This is especially true for countersunk heads. The tensile load in the fasteners must be distributed axially and homogeneously from the head. This makes transfer difficult, leading to axial misalignment and local contact stresses. This can be the reason. Furthermore, the fact that the clearances are sensitive to tolerances makes them precise. This can negatively affect test repeatability in geometrically-shaped connection elements. In contrast, in the test setup that is the subject of this invention, the head of the countersunk screw fastener The geometry is taken as the basis, the connecting element is 10 from the center gap in the spacer. The head is placed on a beveled or conical seating surface and the load is transferred to the head. The transmission is ensured axially over the surface. Thus, the grip Eccentricity and irregular load transfer that occur in known solutions based on this principle By resolving the problems, the fastener will only be subjected to tensile load. A controlled testing environment is being created. 15 The patent referenced as “CN105527159A” was found as a result of research conducted in the literature. and the tensile strengths of finished bolts and similar fasteners in measurement, aimed at shortening test time and speeding up connection processes This patent concerns a test fixture. In this patent, the upper and lower fixture blocks, and the tensile rods are 20... and by using T-channel placement structures, test elements can be quickly attached The aim is to make it demountable, particularly for operational efficiency in serial testing applications. is highlighted. However, in this solution, the main connecting elements... A general contextual approach is adopted without distinguishing between geometries, Load transfer conditions specific to the conical head structure of countersunk threaded fittings 25 This is not addressed specifically. This situation concerns the tensile strength of countersunk fittings. During the tests, non-homogeneous contact conditions on the head surface and lateral loads were encountered. formation of its components and the fastener outside the designed fracture zone This can lead to damage. Furthermore, the use of T-channel and adapter structures, Additional parts are required for countersunk elements of different diameters and sizes, which results in 30 This can limit the accuracy and repeatability of the test. In contrast, the subject matter of the invention... In the test setup, the countersunk threaded connector has a threaded gap at the bottom end. It is secured to the lower fixture via a device, while the head section is positioned on the spacer at the top. by centering it with a beveled seating surface, between the two fixtures during testing. Only the connecting element is provided. Thanks to this structure, the tensile strength is 35. The load is transferred to the fastening element axially, symmetrically and in a controlled manner. geometry encountered in known quick coupling-based solutions being implemented Technical problems such as discrepancy, axis misalignment, and measurement uncertainty can be effectively addressed. is being eliminated. In conclusion, under the known state of the art, countersunk threaded fasteners... In performing tensile tests, the geometric properties of the fastener must be fully considered. adaptable, transferring the load axially and homogeneously, of different sizes Directly with adaptable and universal testing machines for similar fasteners. It appears that there is no test setup that can be used together. These shortcomings affect test 10. negatively impacts the accuracy, repeatability, and conformity of the results to standards. It has an effect in that direction. Purpose of the Invention The primary purpose of the invention is to increase the tensile strength of countersunk threaded fasteners. technical and structural problems encountered during experimental determination The aim is to provide a tensile test setup for eliminating countersunk heads, especially. a connector having a specific geometry and at least one section of its body containing a screw thread The components are reliably and securely connected directly to universal testing machines, and 20 The fundamental principle of the invention is to enable it to be subjected to repeatable tensile tests. It is one of its purposes. Another objective of the invention is to reduce the load applied to the fastener during tensile testing. Axial and homogeneous 25 based on the head geometry of the fastening element. The aim is to ensure that the connection is made in this way. In this context, the countersunk head of the connecting element The test was performed by transferring the load through a seating surface compatible with the structure. during which axial misalignment, bending moment and unwanted lateral load components The aim is to prevent this from happening. Thus, the connecting element only The aim is to create a controlled test environment where the material will be subjected to tensile load. 30 Another objective of the invention is to ensure that the fastener is secure and axially aligned from the bottom end during testing. by ensuring that it is fixed in place, preventing it from tending to rotate under tensile load or The aim is to prevent the formation of unwanted load components through the screw threads. This Thanks to this, 35% of the damage that occurred in the head and body regions of the fastener during the testing process. 6 stress distributions are formed in a way that reflects actual usage conditions and The aim is to accurately observe the detachment behavior. Another purpose of the invention is to improve the tensile performance of countersunk threaded fasteners during testing. Local stress concentrations occur in the areas where the fastener contacts the test setup. 5 and to reduce the risk of premature damage resulting from point contact. In this regard, the connection the head of the element, instead of flat or inconsistent surfaces, should be in accordance with its geometry. supported by a spacer structured in such a way that the load is carried through this spacer The aim is to transmit it in a controlled manner. Another aim of the invention is to create molds with different diameters and sizes but similar geometric characteristics. Countersunk head threaded fasteners carrying the load were tested using the same tensile testing setup. The aim is to enable testing. In this context, the test setup has a modular structure. This means that only certain components are available, depending on the dimensions of the connecting element. The aim is to test different fasteners by modifying them. 15 Therefore, separate test apparatuses must be designed and manufactured for each fastener. by eliminating the need, operational efficiency and cost in testing processes The aim is to provide an advantage. Another aim of the invention is to create a system that can be used with universal testing machines, and is easy to assemble and requires 20 The aim is to provide an easy-to-install, rigid, and durable tensile testing setup. Accordingly, the structural integrity of the test setup under the loads it will be subjected to during the test. structuring it in a way that preserves its integrity, geometric in repeated tests it does not lose its sensitivity and produces reliable results with long-term use. is targeted. 25 Finally, the purpose of the invention is to perform tensile tests on countersunk threaded fasteners. by increasing the accuracy and repeatability of the experimental data obtained in relation to the product in qualification, quality control and standards compliance assessments The goal is to create a reliable testing infrastructure that can be used. This will allow connection 30 accurate determination of the actual mechanical performance of the components and The aim is to improve application security. The invention is designed to fulfill the purposes stated above; it consists of a countersunk head at the top and this countersunk head... a cylindrical body attached to the head and extending axially, with 35 on that body 7 experimental tensile strength of test elements containing a toothed section It is a tensile test setup designed to determine its functionality. A top fixture configured to be attached to one of the jaws of a universal testing machine. a sub-5 configured to connect to the other jaw of the universal testing machine fixture and a spacer positioned between the upper and lower fixtures in question, The spacer in question is the spacer on which the test element will be subjected to the tensile test. a central void that allows for axial positioning within it, In relation to the central cavity, the countersunk head located at the upper end of the test element 10 providing and creating gapless surface contact between the spacer and the upper fixture. A test element bevel, structured in this way, connects the spacer and the upper fixture during testing. will prevent relative movement under the resulting tensile loads and maintain the structural rigidity of the system. fasteners that enable mechanical connection in such a way as to provide, intermediate 15 a connection that allows the insertion and tightening of fasteners. element gaps, in relation to the connection element gaps in question, connection where the head portions of the elements sit and when the connecting elements are tightened, the gap Structured to create gapless surface contact between the part and the lower fixture. a connecting element bevel, on the lower fixture, 20 with the threaded body portion of the test element. a connection that enables the test element to be fixed axially from the lower end The lower fixture includes a connection gap. Explanation of the Figures Figure 1 shows the determination of the tensile strength of countersunk threaded fasteners. General view of the tensile testing setup configured for this purpose. It shows. Figure 2 shows the center clearance and connection of the spacer used in the tensile testing setup. The image shows a detailed view of the element, including its seating surfaces. 30 Explanation of Part References A. Test Setup 10. Top fixture 35 8 11. Upper fixture connection gaps 20. Intermediate piece 21. Central void 22. Fastener gaps 23. Test element price 5 24. Fastener bevel 30th Sub-fixture 31. Lower fixture connection gap 40. Test element 50. Fasteners 10 Detailed Description of the Invention The invention relates to countersunk screw fasteners, briefly referred to as the test in the invention. 15 for experimental determination of the tensile strengths of the element (40). It relates to a tensile test setup (A) that has been developed. The test described within the scope of the invention setup (A); an upper fixture (10), a lower fixture (30), positioned between these two fixtures to include a spacer (20) and a test element (40) to be subjected to tensile testing It is structured. The test setup in question (A) has a countersunk head geometry in particular. Screw fasteners are tested axially in a controlled manner on universal testing machines, 20 making it possible to subject it to tensile testing in a reliable and repeatable manner. It makes it possible. The basic technical approach of the invention is that the surfaces in direct contact with the test element (40), The test element is configured in a way that is compatible with its geometric characteristics, and the upper fixture is 25. (10), the spacer (20) and the lower fixture (30) will not have any gap between them before testing. based on the principle of joining them in such a way that they provide zero-to-zero surface contact. It is based on this structure. Thanks to this structure, the loads applied during the tensile test are tested The bending moments are transmitted to the element (40) only in the axial direction; the bending moments are transmitted to the axis. Misalignments and unwanted side load components are largely eliminated. 30 Test element (30) represents countersunk elements such as Hi-Lok and the head angle It is usually between 100° and 130°. The upper fixture (10) is to be attached to one jaw of the universal testing machine. It is an element with a structured, high-rigidity body. Upper fixture (10), test 35 9 will not deform under the high tensile forces it will be subjected to during use It is designed with appropriate material selection and cross-sectional geometry. On the upper fixture (10), Multiple top fixtures enabling mechanical connection with the spacer (20) The connection gap (11) is located. These connection gaps (11) are for the connection elements. (50) It is designed to allow passage and squeezing. 5 The intermediate part (20) plays a central role in terms of the technical function of the invention and is superior. It functions as an intermediate structure positioned between fixture (10) and sub-fixture (30). The spacer (20) ensures that the test element (40) is positioned on the correct axis. It also ensures gapless surface contact between the upper and lower fixtures. It contributes to the realization in this way. Intermediate piece (20), in general It is structured in the form of a prismatic body, with a central cavity (21), connection element gaps (22), test element chamfer (23) and connecting element chamfer (24) It is located. The center gap (21) located on the spacer (20) will be subjected to the tensile test. a transition gap that allows the element (40) to pass through the intermediate piece (20) It is structured as follows: The center gap (21) is based on the body diameter of the test element (40) and Designed to fit the tolerances, the test element (40) intermediate part (20) It allows for free but axial positioning within it. Center 20 Thanks to the gap (21), the test element (40) is placed between the spacer (20) and the side surfaces, which is unwanted. loads are applied only through designated reference surfaces without forming contacts. It carries. Test element chamfer defined on the spacer (20) in relation to the center gap (21) 25 (23) is the chamfered or conical surface on which the countersink head of the test element (40) sits. Test The chamfer of the element (23) is compatible with the countersink geometry of the test element (40). It is structured and the test element (40) is in the correct axis within the spacer (20) and It ensures that it is centered in a stable manner. In this context, the test element bevel (23), The central void (21) is structured to be concentric with the axis. 30 Thanks to the test element chamfer (23), the countersink of the test element (40) is made of spacer (20) It is supported by a large contact area; thus, the head during the tensile test This prevents the formation of local stress concentrations in the region. 35 The spacer (20) also has connecting element gaps (22). This mechanical gaps between the connecting element (22), spacer (20) and the upper fixture (10) allowing the passage of the connecting elements (50) that enable the connection to be established They are through holes. Connector gaps (22) ensure the proper functioning of the connectors. 5 to ensure alignment and prevent axial deviation during assembly. It is positioned. The spacer (20) and the upper fixture (10) preferably have at least four connections. It is connected to each other through element (50). Defined on the spacer (20) in relation to the fastener gaps (22). The chamfer of the connecting element (24), the chamfer where the heads of the connecting elements (50) sit. are surfaces. The chamfer of the connecting element (24) is the head geometry of the connecting elements (50). It is structured in the form of an inclined surface to be compatible. Fastener When the chamfer (24), connecting elements (50) are tightened, between the spacer (20) and the lower fixture (30) It ensures that surface contact occurs without any gaps. In this context, The connecting element chamfer (24) is located on the lower surface of the spacer (20). This 15 Thus, during assembly made by means of connecting elements (50), tolerances are avoided. Openings that may occur due to voids, burrs, or surface irregularities are eliminated. is being removed. Test element (40) is a countersunk head threaded fitting subjected to tensile testing, 20 Test element (40), intermediate part (20) is the primary element tested within the scope of the invention. by passing through the central gap (21) on it, in the direction of the test element bevel (23) is positioned. At this stage, the countersink of the test element (40), the bevel of the test element (23) is placed on it and the test element is axially positioned inside the spacer (20). It is becoming centered. 25 After the test element (40) is placed inside the spacer (20), the spacer (20) connects It is connected to the upper fixture (10) by means of the connecting elements (50). Connecting elements (50), The connecting element is passed through the gaps (22) on the intermediate piece (20) and the upper The fixture is screwed into the connection gaps (11) and tightened. This tightening process takes 30 minutes. As a result, a rigid and secure connection between the spacer (20) and the upper fixture (10). is created; thanks to the test element chamfer (23), the countersink of the test element, the spacer It is held in place without any gaps between the top and bottom fixtures. 11 At this stage, the gear housing passing through the center gap (21) of the test element (40). This part of the gear housing remains free on the underside of the spacer (20). It is being prepared to be linked with sub-fixture (30). Sub-fixture (30) is universal. High rigidity, configured to be attached to the other jaw of the testing machine. It is a body element and has a lower fixture connection gap (31) on it. 5 The lower fixture connection gap (31) will be connected to the threaded housing part of the test element (40). It is structured in such a way. The lower fixture connection gap (31) is threaded by the test element (40). It allows the part to be connected by turning it to the lower fixture, and the test element (40) It ensures secure and axial fixation from the lower end. In this context, the lower 10 The fixture connection gap (31) is concentric with the cylindrical body axis of the test element (40). It is structured in such a way that the lower fixture (30) is attached to the threaded part of the test element (40). It is advanced by turning and tightened until it contacts the lower surface of the spacer (20). When the lower fixture (30) contacts the spacer (20), the connecting element chamfer (24) is activated. entering and zero surface contact between the lower fixture (30) and the spacer (20). This structure ensures that there is no gap between the lower fixture (30) and the spacer (20). No gaps remain, and the system becomes a single, rigid structure. At this stage, The upper fixture (10), the intermediate piece (20) and the lower fixture (30) are fully assembled, with the intermediate piece (20) and the lower fixture (30) fully joined together. only test element (40) remains. 20 After the assembly process is completed, the upper fixture (10) and lower fixture (30) undergo universal testing. It is attached to the opposing jaws of the machine. During testing, the universal testing machine The upper and lower fixtures (10,30) are moved further apart in a controlled manner by the As a result of this movement, a tensile load is applied to the test element (40) in between. 25 Thanks to the test setup (A) described in the invention, the tensile load test element can be applied. It is transmitted only in the axial direction, elements other than the test element (40) are the load It does not carry. Thanks to this structure, the actual tensile strength, breaking load and breaking point of the test element (40) are determined. The mode can be determined in a reliable, repeatable, and standards-compliant manner. The invention provides axial centering, zero-to-zero surface contact, and rigid bracing. Thanks to its features, measurement errors, bending effects and lateral impacts that may occur during testing are minimized. The loads are largely eliminated. Upper fixture (10), spacer (20) and lower fixture (30), structural strength and rigidity under high forces generated during tensile testing 35 12 preferably made of metal material to ensure its protection It is structured in such a way that, especially for countersunk threaded fasteners, the tension... Technical problems encountered in the tests are effectively resolved and high accuracy is achieved. Experimental results are being obtained.
Claims
13 REQUESTS 1. The invention relates to a device with a countersunk head at its upper end and an axially extending structure adjacent to this countersunk head. It consists of a cylindrical body and a toothed section formed on that body. 5 for experimental determination of the tensile strengths of test elements (40) a tensile test setup (A) whose characteristic is; ● configured to be attached to the jaw of a universal testing machine to be connected to the other jaw of the universal testing machine with the upper fixture (10) a structured sub-fixture (30) and the said upper fixture (10) and sub-fixture (30) 10 an intermediate piece positioned between (20), ● the test element to be subjected to tensile testing on the aforementioned intermediate part (20) (40) allows for axial positioning within the spacer (20). a central void (21), ● 15 located at the upper end of the test element (40) in relation to the central gap (21). Axial position of the test element (40) during tensile test where the countersunk head sits ensuring its centering in the direction of the spacer (20) and the upper fixture (10) a test structured to create gapless surface contact between them element price (23), ● The spacer (20) and the upper fixture (10) are subjected to tensile loads during testing. to prevent relative motion and ensure the structural rigidity of the system connecting elements that enable mechanical connection (50), ● on the spacer (20), the spacer (20) and the upper fixture (10) are mechanically connected. to ensure connection of the connecting elements (50) and fastener gaps that allow it to be tightened (22), 25 ● In relation to the gaps in the connection element (22), the connection where the head parts of the elements (50) sit and the connecting elements (50) If tightened, there will be no gap between the spacer (20) and the lower fixture (30). a connecting element bevel (24) structured to form contact, ● on the lower fixture (30), by connecting with the threaded body part of the test element (40) 30 a lower part that enables the test element (40) to be fixed axially from the lower end. fixture connection gap (31), It includes. 35 14 2. A tensile test setup (A) conforming to Claim 1, with the test element (40) head the part sits firmly on the spacer (20) and the tensile test to ensure the test element is centered in the axial direction during testing. The bevel (23) is angled to match the head geometry of the test element (40). and is structured to include a seating surface in the form of a ring. 5 3. A tensile test setup (A) conforming to claim 2, the characteristic of which is that the test element (40) positioning within the spacer (20) without creating axial misalignment In order to ensure that the test element chamfer (23) is aligned with the center clearance (21) axis It is structured in such a way that it is concentric. 10 4. A tensile test setup (A) conforming to claim 1 or 2, with the characteristic of having a spacer. The connection between (20) and the upper fixture (10) is smooth and balanced. To ensure its installation, the connecting elements (50) on the spacer (20) fastener gaps (22) 15 allowing for insertion and tightening It includes.
5. A tensile test setup (A) conforming to Claim 4, the characteristic of which is; the fasteners (50) to ensure a smooth seating surface is obtained during squeezing so, the chamfer of the connecting element (24), the ends of the connecting elements (50) 20 It is structured in the form of a sloping surface that will be compatible.
6. A tensile test setup (A) conforming to claim 5, with the feature of being; spacer (20) and bottom To ensure that gapless surface contact is created between the fixtures (30), The chamfer of the connecting element (24) is located on the lower surface of the spacer (20) 25 It is the fact that.
7. A tensile test setup (A) conforming to claim 4 or 5, with the characteristic of having a spacer. To ensure that (20) and the upper fixture (10) are rigidly connected during the test. Accordingly, the intermediate piece (20) and the upper fixture (10) must have at least four connections. It is combined through element (50).
8. A tensile test setup (A) conforming to Claim 1, the characteristic of which is that the test element (40) lower fixture connection to ensure axial fixation from the lower end. the gap (31) is concentric with the cylindrical body axis of the test element (40) It is structured in such a way that it will be 9. A tensile test setup (A) conforming to claim 8, the characteristic of which is that the test element (40) To ensure secure mechanical connection with the lower fixture (30), the lower fixture connection 5 The cavity (31) is structured to include a toothed inner surface.
10. A tensile test setup (A) conforming to Claim 1, with the characteristic of having an upper fixture (10) and a lower one. ensuring smooth surface contacts between fixtures (30) and assembly In order to increase its sensitivity, the spacer (20) is a prismatic 10 It has a body shape.
11. A tensile test setup (A) conforming to Claim 1, the characteristic of which is; during the tensile test maintaining structural strength and rigidity under the high forces generated. In order to provide, the metal 15 of the upper fixture (10), the spacer (20) and the lower fixture (30) It is made of a material.