Ultrahigh-temperature outward extension type deformation measurement device

Abstract

The invention discloses a uniaxial tension test outward extension type deformation measurement device in an ultrahigh-temperature environment. The device comprises a high-temperature furnace (1), an environmental chamber small box (2), an upper loading pull rod (3), a lower loading pull rod (4), a ring sleeve (5), a clamp (6), an upper clamping ring (8), a lower clamping ring (9), a first connecting pin (11), a stretching rod (12), an upper bracket (13), a lower bracket (14), a bolt (15), a rolling bearing (16), a second connecting pin (17), a guide slot (18), a locking spring (19), a linear variable differential transformer (20), a circumference constraint device (21) and a third connecting pin (22). By the adoption of an outward extension type design, a displacement measurement part is transferred to a normal temperature area outside the high-temperature furnace from an ultrahigh-temperature area in the high-temperature furnace, the quantitative research of the ultrahigh-temperature extension test is realized, and the measurement precision is improved; instrument parts in the ultrahigh-temperature area are made of ultrahigh temperature resistant materials; moreover, the mechanical properties of the ultrahigh-temperature materials are tested and researched, the operation is simple, and the feasibility is high.

Description

technical field [0001] The invention relates to a deformation measurement device of a test piece under the action of ultra-high temperature uniaxial tensile load, which adopts an overhanging design, and transfers the deformation measurement in the ultra-high temperature area to the normal temperature area, so as to realize the quantitative research of the ultra-high temperature tensile test. In particular, the invention relates to mechanical performance testing of ultra-high temperature materials, and belongs to the technical field of ultra-high temperature mechanical testing. Background technique [0002] At present, hypersonic aircraft with hypersonic speed, high maneuverability, and long-distance precision strike as the main technical indicators have become a hot spot in the world's military. Strategic missiles and near-space hypersonic vehicles need to fly across the atmosphere for a long time, and the service conditions are harsh. In particular, the temperature of the l...

AI Technical Summary

Problems solved by technology

High-temperature extensometers are commonly used in contact measurement to measure the deformation within the gauge length of the specimen, but due to the high-temperature environment, the usual fixing methods (gluing, clamping, binding, etc.) between the extensometer’s extensometer and the specimen are difficult to apply; in addition, In order to ensure the normal operation of the extensometer, the side furnace wall of the high temperature furnace is often opened, only the extension arm is placed in the furnace, and the sensing and measuring part is placed outside the furnace, which brings difficulties to the heat insulation and sealing design of the high temperature furnace

Non-contact measurement mainly includes methods such as speckle technology, moiré, and laser extensometer. The change of the refractive index will cause the distortion of the image, which will greatly affect the accuracy of the image acquisition and calculation; The structure, heat insulation and airtight design of the high temperature furnace bring difficulties

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