CN218766352U - Static tensile test sample suitable for different loading directions of explosive welding interface - Google Patents
Static tensile test sample suitable for different loading directions of explosive welding interface Download PDFInfo
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Abstract
The utility model relates to a static tensile test sample suitable for different loading directions in explosive welding interface belongs to the quasi-static tensile mechanical properties test technical field in interface. The sample is a composite plate with an I-shaped structure, the composite plate is a centrosymmetric structure formed by two plates with the same size through explosive welding, and the centrosymmetric structure is overlapped with the geometric center point of an explosive welding interface; during the subsequent performance test, the included angle between the loading direction and the explosive welding interface of the sample is 0-90 degrees. The utility model discloses an optimize the sample structure, combine universal material testing machine and hypervelocity digital camera, can realize the research of the quasi-static tensile mechanical properties of explosion welding interface in different loading orientations, for the rejection rate that obtains good explosion welding composite sheet and reduce the product, the quality and the life-span of improvement product have important reference value, all have important guide effect to the selection of the actual production processing and the explosion welding parameter of guiding the composite sheet simultaneously.
Description
Technical Field
The utility model relates to a static tensile test sample suitable for different loading directions in explosive welding interface belongs to the quasi-static tensile mechanical properties test technical field in interface.
Background
With the development of science and technology, explosive welding composite materials have been widely applied to the fields of industrial engineering such as aerospace, petroleum, chemical engineering, shipbuilding, machinery, electronics, electric power and the like. Wherein, the explosive welding is an effective means which can combine metals with the same, similar or different physical and chemical properties, and even can combine products which cannot be or are difficult to be made. The welding quality of explosive welding is mainly measured by tensile strength, shearing strength and bending strength of composite interfaces of different plates welded by explosive welding, the degree of crystallization embrittlement of the composite plate interfaces, the change of hardness and corrosion resistance of the composite plates and the like. At present, the mechanical property research of the explosion welding composite board mainly focuses on the comprehensive static mechanical aspect of the composite board, and the research on the quasi-static direct tensile mechanical property of a composite interface is less. In the industrial production application of explosive welding, the microstructure and the mechanical property of a welding interface along the direction of explosive welding are not clear, the tensile mechanical property of the welding interface is an important standard for measuring the welding quality, and particularly, a transition joint, a composite plate, parts and the like of the transition joint, the composite plate and the parts and the like which are prepared by explosive welding in the industrial engineering fields of aerospace, petroleum, chemical engineering, shipbuilding, machinery, electronics, electric power and the like often fail at the welding interface under different application working conditions. Therefore, a test for tensile mechanical properties of an explosion welding interface and a method thereof are a problem to be solved urgently in industrial application. However, in order to obtain a high quality welding result in the explosive welding process, a cover plate with a thickness of millimeter is often selected for welding and compounding. Due to the limitation of the thickness and the size of the explosion welding shroud plate, the direct tensile mechanical property of a welding interface is difficult to test and research by adopting a conventional direct tensile mechanical property test method.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the prior art, the utility model provides a static tensile test sample suitable for different loading directions of explosive welding interface through the sample of design specific structure, combines universal material testing machine and hypervelocity digital camera (DIC), can realize the research of the quasi-static tensile mechanical properties of explosive welding interface on different loading directions.
The purpose of the utility model is realized through the following technical scheme.
The test sample is a composite plate with an I-shaped structure, the composite plate is a centrosymmetric structure formed by two plates with the same size through explosive welding, and the centrosymmetric structure is overlapped with the geometric center point of the explosive welding interface; during the performance test, the included angle between the loading direction and the explosive welding interface of the sample is 0-90 degrees. In addition, the two plates can be made of the same or different materials.
The sample is divided into an upper horizontal plane, a vertical plane and a lower horizontal plane, wherein the vertical plane is vertical to the upper horizontal plane and the lower horizontal plane respectively; the linear direction parallel to the vertical surface and vertical to the lower horizontal surface is recorded as the length direction, two directions vertical to the length direction are respectively recorded as the width direction and the thickness direction, but the width dimension is larger than the thickness dimension;
the length of the sample is designated L, the width is designated W, the thickness is designated H (the thickness of the sample is equal to the thickness of each plate), and the dimension of the upper horizontal plane or the lower horizontal plane in the length direction is designated L 1 The dimension of the vertical plane in the width direction is denoted as w 1 Then L is preferably 8.5mm to 10mm, W is preferably 7mm to 9mm, H is preferably 1mm to 2mm 1 Preferably 1.5mm to 2mm 1 Preferably 1.5mm to 2.5mm.
Further, when the included angle between the loading direction and the explosion welding interface of the sample is 90 degrees (or the included angle between the explosion welding interface of the sample and the lower horizontal plane in the sample is 0 degree), an induction notch is formed along the direction of the welding interface, and preferably, the induction notch is an equilateral triangle with the side length of 0.5 mm-1 mm.
Further, when the included angle between the loading direction and the explosive welding interface of the sample is larger than 0 degree and smaller than 90 degrees, two sides of the sample gauge length horizontal center line (or the center line of the sample in the length direction) are respectively provided with an induction notch, preferably an equilateral triangle induction notch with the side length of 0.5 mm-1 mm.
Testing a sample by using a universal material testing machine, realizing loading of different strain rates of the sample by changing a loading rate, and monitoring the failure process and crack propagation of an explosion welding interface by combining an ultrahigh-speed digital camera; by carrying out subsequent processing on the data obtained by monitoring, the stress-strain relationship of the tensile mechanical properties of the explosive welding interface of the composite plate in different loading directions and the failure mechanism thereof can be obtained, so that the quasi-static tensile mechanical property evaluation of the explosive welding interface in different loading directions is realized.
Has the advantages that:
(1) The utility model discloses a I shape sample can adopt direct tensile experimental research mode to study along the regional tensile mechanical properties in the different positions of detonation direction to welding interface to the research of the influence of detonation growth process to welding interface's micro structure and mechanical properties has been realized.
(2) The purpose of arranging the induction notches in different loading directions is to realize stress concentration. Due to the presence of stress concentrations, failure first occurs at the location of the notch during the tensile test, thereby achieving tensile failure at the location of the weld interface. When tensile tests in loading directions at different angles are researched, the welding interface is often caused by the existence of welding defects, the mechanical property is not good, and the design of the notch can realize a mode of the tensile property of the welding interface when the defects exist in the base material. The design of the induction gap well meets the research of the failure fracture mode and the failure mechanism of the explosive welding composite plate under different working conditions in practical application.
(3) Based on the test sample can realize the test and the failure mechanism research of the quasi-static tensile mechanical properties under different applied environment conditions to the different technological parameters of composite sheet material explosive welding interface, has important reference value for obtaining the rejection rate of good explosive welding composite sheet and reduction product, improving the quality and the life-span of product, has important directive function to the selection of the actual production processing and the explosive welding parameter of guiding the explosive welding composite sheet simultaneously.
Drawings
FIG. 1 is a schematic view of the structure of the sample described in example 1.
Fig. 2 is a schematic view of the different angles of the explosive welding interface and the loading direction of the test piece described in example 1.
Fig. 3 is a schematic structural view of an induced notch formed in the sample when the angle between the loading direction and the explosion-welded interface of the sample is not 0 ° in example 1.
FIG. 4 is an SEM image of an EDS analysis of a fracture interface after failure of the specimen described in example 1.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and detailed description, wherein the process is conventional unless otherwise specified, and the starting materials are commercially available from the public without further specification. In addition, in the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Example 1
The method takes a large-area titanium (TA 2) -steel (Q235) explosion welding composite plate with the length, the width and the thickness of 750mm, 350mm and 130mm as a research object, and researches the quasi-static tensile mechanical properties of an explosion welding interface in different loading directions, and specifically comprises the following steps:
(1) Cutting a small-area composite plate with the length of 10mm, the width of 9mm and the thickness of 1mm from the large-area composite plate, wherein the small-area composite plate comprises two titanium plates and two steel plates with the same size;
processing a small-area composite plate into a centrosymmetric I-shaped structure, wherein the central symmetric point overlaps with the geometric central point of an explosive welding interface of a titanium plate and a steel plate in the small-area composite plate, in order to realize different loading directions, three I-shaped samples (or three I-shaped samples, wherein the included angles between the explosive welding interface and the loading direction are respectively 90 degrees, 45 degrees and 0 degrees) are prepared in the embodiment, and the three I-shaped samples (or the included angles between the explosive welding interface and the horizontal plane are respectively 0 degree, 45 degrees and 90 degrees) are prepared, so that three static tensile test samples suitable for the explosive welding interface in different loading directions are obtained, and are shown in fig. 2;
the sample is divided into an upper horizontal plane, a vertical plane and a lower horizontal plane, wherein the vertical plane is vertical to the upper horizontal plane and the lower horizontal plane respectively; the linear direction parallel to the vertical surface and vertical to the lower horizontal surface is recorded as the length direction, two directions vertical to the length direction are respectively recorded as the width direction and the thickness direction, but the width dimension is larger than the thickness dimension;
the length of the sample is designated L, the width is designated W, the thickness is designated H (the thickness of the sample is equal to the thickness of each plate), and the dimension of the upper horizontal plane or the lower horizontal plane in the length direction is designated L 1 The dimension of the vertical plane in the width direction is denoted as w 1 Then L =10mm, W =9mm, H =1mm, L 1 ＝2mm，w 1 =2mm, as shown in fig. 1;
when the included angle between the loading direction and the explosion welding interface of the sample is 90 degrees, an equilateral triangle induction gap with the side length of 0.8mm is formed along the direction of the welding interface; when the included angle between the loading direction and the explosion welding interface of the sample is 45 degrees, two equilateral triangle induction gaps with the side length of 0.8mm are respectively formed along two sides of the sample gauge length horizontal center line, as shown in fig. 3;
(2) Polishing the sample to make the surface smoothness of the sample reach 0.4-0.6, and then cleaning the sample with alcohol and airing the sample for later use;
(3) The method comprises the following steps of (1) installing a sample in a universal material testing machine, wherein the upper horizontal plane and the lower horizontal plane of the sample are used as two loading surfaces, loading different strain rates of the sample is realized by changing the loading rate, and the failure process and the crack propagation of an explosion welding interface are monitored by combining an ultrahigh-speed digital camera;
(4) By carrying out subsequent processing on the data obtained by monitoring, the stress-strain relationship of the tensile mechanical properties of the explosive welding interface of the composite plate in different loading directions and the failure mechanism thereof can be obtained, so that the quasi-static tensile mechanical property evaluation of the explosive welding interface in different loading directions is realized.
The test specimens failed during the stretching process and the failed composite panels fractured from the explosive welding interface. Elemental analysis (EDS) was performed on the fractured interface of FIG. 4, and the percentage of Ti was measured to be 99.6% and the percentage of Fe was measured to be 0.4%, indicating that fracture occurred from the explosion-welded interface.
In summary, the above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The static tensile test sample suitable for different loading directions of explosion welding interface, its characterized in that: the sample is a composite plate with an I-shaped structure, the composite plate is a centrosymmetric structure formed by two plates with the same size through explosive welding, and the centrosymmetric structure is overlapped with the geometric center point of an explosive welding interface.
2. The static tensile test specimen suitable for different loading directions of an explosive welding interface according to claim 1, characterized in that: the test sample is divided into an upper horizontal plane, a vertical plane and a lower horizontal plane, wherein the vertical plane is vertical to the upper horizontal plane and the lower horizontal plane respectively; the linear direction parallel to the vertical surface and vertical to the lower horizontal surface is recorded as the length direction, two directions vertical to the length direction are respectively recorded as the width direction and the thickness direction, but the width dimension is larger than the thickness dimension;
the length of the sample is recorded as L, the width is recorded as W, and the thickness is recorded as H; the dimension of the upper horizontal plane or the lower horizontal plane in the length direction of the sample is marked as l 1 The dimension of the vertical plane in the width direction is denoted as w 1 ；
Then L is 8.5 mm-10mm, W is 7 mm-9mm, H is 1 mm-2mm 1 Is 1.5 mm-2mm in weight percentage 1 Is 1.5 mm-2.5 mm.
3. The static tensile test specimen suitable for different loading directions of an explosive welding interface according to claim 1, characterized in that: and when the included angle between the loading direction and the explosion welding interface of the sample is 90 degrees, an induction notch is formed along the direction of the welding interface.
4. The static tensile test specimen suitable for different loading directions of an explosive welding interface according to claim 3, wherein: an equilateral triangle induction gap with the side length of 0.5 mm-1 mm is opened along the direction of the welding interface.
5. The static tensile test specimen suitable for the different loading directions of the explosive welding interface according to any one of claims 1 to 4, wherein: and when the included angle between the loading direction and the explosion welding interface of the sample is more than 0 degree and less than 90 degrees, respectively forming an induction notch along two sides of the sample gauge length horizontal center line.
6. The static tensile test specimen suitable for different loading directions of an explosive welding interface according to claim 5, wherein: and two sides of the sample gauge length horizontal center line are respectively provided with an equilateral triangle induction gap with the side length of 0.5 mm-1 mm.
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