Clamp used for tension-torsional fatigue performance test of samples of micron-grade sizes

Abstract

The invention relates to a clamp used for the tension-torsional fatigue performance test of samples of micron-grade sizes. The clamp comprises an actuation shaft. A detachable main clamping block is arranged in the actuation shaft and is coaxially positioned together with the actuation shaft. A pressing plate is used in cooperation with the main clamping block for pressing the samples. A main clamping block locking nut is locked on the main clamping block and fastens the main clamping block and the actuation shaft. The samples are positioned and clamped through the detachable clamping block according to the center mark, the installation coaxiality of the main clamping block is ensured through the coaxial cooperation of the main clamping block and the actuation shaft, and therefore the main clamping block is convenient to position and install, the problems that when tiny samples are clamped through conventional clamps, the positioning accuracy is poor and positioning and clamping are not convenient are solved, and the clamping accuracy and the sample clamping efficiency can be improved. The horizontally-pushing structural form is adopted as the sample clamping mode, clamping is reliable, the structure is simple, and the clamp is suitable for the tension-torsional fatigue performance test of the samples of the micron-grade sizes and has the advantages of being high in clamping accuracy, reliable in clamping, small in clamping installation torque, capable of conveniently conducting the positioning and clamping operation, simple in structure and easy to machine.

Description

technical field [0001] The invention relates to a clamp, in particular to a clamp for tensile, torsion or tensile torsion multiaxial fatigue performance test of a micron-sized sample. Background technique [0002] The mechanical properties of micron-scale materials, especially the fatigue performance test, are of great significance for the optimal design and evaluation of microstructures such as coronary stents. Due to the size effect, the fatigue properties and research methods of larger-sized materials are no longer applicable to micron-sized materials, such as 100 μm-sized wires or fibers. Therefore, it is necessary to conduct uniaxial and multiaxial fatigue performance tests for micron-sized materials. [0003] The tensile and torsion multiaxial fatigue performance test of micro-sized materials puts forward special requirements for the test fixture: 1) It can provide sufficient clamping force for 100 μm high-strength fibers, and the clamping is reliable without slipping...

AI Technical Summary

Problems solved by technology

The following problems will arise when conventional fixtures are directly used for micron-scale material testing: 1) The size of the micron-scale sample is the same as the gap between the clamping surfaces of the chuck, and the clamping is unreliable and easy to slip; 2) The size of the micron-scale sample is different from that of the conventional The clamping coaxiality error is close, and the clamping coaxiality does not meet the requirements of the tensile torsion multiaxial fatigue performance test; 3) Due to the unreliable clamping and the poor effectiveness of the clamping structure, it is inevitable to affect the actuation while clamping. Or the measurement axis applies a large bending moment and torque, which will reduce the life of the actuator or sensor or may directly damage it

Therefore, conventional fixtures cannot be directly applied to the fatigue performance test of micron-sized materials

On the other hand, if the structure of the conventional fixture is suitable for clamping micron-sized materials, the requirements for the machining accuracy of the fixture will be very high, and the processing and manufacturing will be very difficult.

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