A small stretching and bending device

Abstract

The invention discloses a small stretch bending device, which is composed of a bending loading mechanism, a test piece clamping mechanism, a stretch loading mechanism and a bending displacement measuring apparatus. The stretch loading mechanism drives first stage worm and gear through a motor, then a bidirectional lead screw-nut pair converts curve motion into linear motion, a tensile force is loaded to two ends of a test piece clamp, and then the tensile force is loaded to the test piece. One end of the clamp is equipped with a tension-compression sensor for detecting the tensile force borne by the test piece. The stretch displacement can be monitored at any time through a contact type displacement sensor installed below the clamp. The bending loading mechanism drives a worm and gear through a motor, and then a unidirectional lead screw-nut pair converts curve motion into linear motion so as to drive a base mounted on the lead screw and a bending pressure head to realize reciprocating motion. The bending displacement can be detected by the contact type displacement sensor installed on the base. The bending pressure head is also equipped with a miniature tension-compression sensor for detecting the stress of the pressure head during bending.

Description

Technical field [0001] The invention relates to a device with a small volume and an exquisite structure that can be used for testing single and composite mechanical properties of materials in micro-nano stretching and bending. Through the invention, the test piece can be subjected to in-situ tensile and bending tests under the observation of various imaging instruments, and the in-situ observation of the microscopic deformation and damage process of the material can be carried out. This device will have good application prospects in the fields of materials science, super processing, solid mechanics and so on. Background technique [0002] In-situ micro-nano mechanics testing technology is a cutting-edge technology developed in recent years and has attracted great attention from governments and research institutions in various countries. The micro-nano tensile and bending mechanics testing technology has many advantages that it can perform in-situ tensile, bending and composite t...

AI Technical Summary

Problems solved by technology

At present, micro-nano bending mechanical tests are mainly carried out in transmission electron microscope (TEM) and scanning electron microscope (SEM), both of which have very limited working chambers, and it is necessary to ensure the electromagnetic compatibility and Vacuum compatibility, it is these reasons that limit the rapid development of micro-nano tensile bending mechanics testing technology

Overall, it is still a challenging task to study a micro-nano tensile-bending composite mechanical testing device with high precision, large testing range, and low cost, and it is also an urgent task.

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