A device and method for testing fracture toughness in a long and narrow space

Abstract

The invention discloses a device for testing breaking tenacity in a long and narrow space and a using method of the device. The device comprises a sleeve, a left clamping head, a right clamping head, a sliding block and pusher fixing rods, the left clamping head, the right clamping head and a tensile sample are mounted inside the sleeve, a functional window used for mounting of the tensile sample and a displacement sensor is arranged in a sidewall of the sleeve, the tensile sample is connected with the left clamping head and the right clamping head through pin bolts, the left clamping head and the right clamping head are connected with the sleeve and the sliding block through mutually-fitted blocking heads and blocking grooves, the sliding block is connected with a force sensor through a bolt, the other end of the sliding block is connected with a matched electric drive pusher, a target card is mounted on the left clamping head and used for providing positioning signals for the displacement sensor. The device has the advantages that by tensioning a test piece and reading values of the displacement sensor and the force sensor, a force-breaking opening displacement (P-V curve) can be drawn to calculate the breaking tenacity of the test piece; a problem in measurement of breaking opening displacement amount in the long and narrow space is solved, and experimental requirements like breaking tenacity measurement in a high-intensity magnetic field condition can be satisfied.

Description

technical field [0001] The invention relates to the measurement of fracture toughness in a composite environment, in particular to a device for testing fracture toughness in a narrow and long space, aiming at the measurement of fracture toughness in a special composite environment, such as a strong magnetic field environment. Background technique [0002] Fracture toughness is an important fracture characteristic property of materials. Conventional fracture toughness measurement methods include compact tensile measurement and three-point bending measurement. These two conventional measurement methods are generally carried out on a tensile-compression testing machine. The tensile-compression testing machine is bulky and can provide a large load, which can meet the measurement of fracture toughness under conventional experimental conditions. In a strong magnetic field experimental environment, it cannot provide loading in a strong magnetic field environment. In the nuclear fu...

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Problems solved by technology

The magnetic field generated by this type of equipment is located in the cylindrical cavity inside the equipment, and due to the problem of the superconducting coil, the diameter of the cylindrical cavity is generally small (about 50mm), and it is impossible to use a conventional tensile and compression testing machine to detect the fracture. Toughness does the work of measurement, so special setups are needed to meet experimental needs

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