A three-point bending test system based on the dynamic fracture toughness of test materials

Abstract

The invention belongs to the field of experimental equipment for the dynamic fracture toughness of a testing material and particularly relates to a three-point bending testing system based on the dynamic fracture toughness of the testing material. The system comprises a pedestal, wherein a support device, a loading rod, a knock rod, a compressed gas gun and a signal acquiring-processing device, a guide rail portion is arranged on the pedestal, and all the components are arranged on the guide rail portion and are fixedly connected and matched with the guide rail portion in a reciprocating guiding manner; the support device comprises a vertical plate which forms a matching portion matched with the guide rail portion, and grooves or through holes penetrating through a plate body are formed in the vertical plate; the support device further comprises a lining plate, and a through hole portion for being penetrated by the loading rod is arranged on the lining plate; lining units are further distributed on the lining plate; the supporting direction of the lining units, relative to a testing sample is opposite to the force applying direction of the loading rod. According to the system, the uniformity of acquired overall data can be guaranteed when the requirements of easiness in detaching and maintaining of a device are effectively realized.

Description

technical field [0001] The invention belongs to the field of experimental equipment for testing material dynamic fracture toughness, and in particular relates to a three-point bending test system based on testing material dynamic fracture toughness, which is used for high-efficiency evaluation and testing of the fracture resistance of metal material structures under impact loads ability. Background technique [0002] With the continuous development of social science and technology, the application of fracture mechanics in engineering has become quite common. In order to analyze the fracture of engineering structures, it is necessary to pass tests to obtain the fracture characteristic data of materials or structures, so that science can be better applied . The fracture test involves a wide range. According to the scale of the test, the fracture test can be divided into small laboratory tests, large laboratory tests and actual structural tests; according to the loading speed,...

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Problems solved by technology

[0003] Although the overall operation process and concept of the current above-mentioned three-point bending experiment have been perfected, the physical experiment structure still has certain defects: in the above-mentioned system, each component is often set as figure 1 Although the fixed part shown in the figure plays a role in bearing a certain impact load and ensuring the working stability of the mechanism, on the one hand, the overall structure is bulky and the assembly is complicated, which is extremely unfavorable or even impossible for disassembly, replacement and maintenance operations, and is bulky Advanced testing systems not only often bring additional burdens for operations such as handling and maintenance, but also greatly reduce the working flexibility of the entire device system, and even need to redesign the test for different samples or different lengths of loading rods or impact rods system; on the other hand, there is no unified standardized design for the actual structure of the sample support device, and the size is often drawn up and adopted by each experimental department, which is also a major factor leading to different test results among various experimental departments. The actual operation of personnel brings great trouble

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