Ultrasonic vibration three-point bending test device suitable for observing crisp and hard material on line

Abstract

The invention discloses an ultrasonic vibration three-point bending test device suitable for observing a crisp and hard material on line. The ultrasonic vibration three-point bending test device comprises a cubical support, and a three-point bending device is fixed on a dynamometer placed on a hydraulic test machine; quartz glass is arranged at the front side of a flat plate on the support; a bottom plate of the support is provided with a movable observing device, and a high-speed photographic tens of the movable observing device corresponds to the quartz glass in position; the flat plate on the support is transversely provided with a dovetail groove guide rail, and a movable supporting seat is connected with the flat plate on the support through the dovetail groove guide rail and is in transmission fit with a lead screw; a semicircular groove is formed in the top surfaces of the movable supporting seat and a fixed supporting seat, a test piece is arranged in the semicircular groove, and a round hard alloy bar is exposed out of the semicircular groove and used for supporting the test piece; and the support at the right side of the fixed supporting seat is provided with a horizontal ultrasonic vibration system, and a longitudinal ultrasonic vibration system is arranged on a main shaft of the hydraulic test machine. By using the ultrasonic vibration three-point bending test device, multi-dimensional vibration of a workpiece can be realized, and the research on ultrasonic vibration grinding cracks can be conveniently carried out through simulating the stress state of a ceramic material in the actual machining process.

Description

technical field [0001] The invention relates to an online observation device for an ultrasonic vibration three-point bending test of a ceramic material sample, especially for measuring the dynamic expansion of fracture cracks of a ceramic sample, and belongs to the category of test equipment. Background technique [0002] Nanocomposite ceramics is a high-performance structural ceramic material, which has excellent properties such as high strength, high toughness, low density, high hardness, high temperature resistance, creep resistance, wear resistance, corrosion resistance and good chemical stability. Gradually become an indispensable key material for cutting-edge technology. [0003] However, the plasticity and toughness of nanocomposite ceramics are still very low, and the hardness is high and the sensitivity to defects is high, which makes it difficult to achieve high-precision, high-efficiency and high-reliability processing. Therefore, how to process the block of nano...

AI Technical Summary

Problems solved by technology

However, the research on the action of ultrasonic tools on ceramic materials is basically carried out from the perspective of technology and macroscopic. At most, the microscopic characteristics of materials are observed after processing, and the influence of ultrasonic vibration on the intrinsic characteristics of materials is not explored.

However, the existing three-point bending test devices are not suitable for online observation of the ultrasonic vibration fracture process of hard and brittle materials such as ceramics.

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