A creep testing machine

Abstract

The invention discloses a creep testing machine, comprising an oil cylinder unit and a testing unit, wherein the oil cylinder unit comprises a cylinder body, a piston, a piston rod and a first non-return valve; and the testing unit comprises a supporting shell, a first joint, a second joint, a second non-return valve, a third non-return valve, a clamping device and a first supersonic detector, wherein the clamping device comprises an upper limiting mechanism and a lower limiting mechanism arranged in a symmetrical way, all the adjusting rods of the limiting mechanisms cooperate with each other so as to clam a to-be-tested sample, thereby allowing the to-be-tested sample to be soaked in to petroleum in the supporting shell, and the first supersonic detector and a second supersonic detector are installed on the supporting shell and respectively used for measuring vertical deformation and horizontal deformation of the to-be-tested sample supported by the clamping device. According to the invention, the interior of the creep testing machine can be filled with petroleum and pressure can be maintained so as to allow the to-be-tested sample to undergo deformation, then vertical and horizontal deformation of the to-be-tested sample can be measured by using the two supersonic detectors, so deformation of the to-be-tested sample can be obtained; and the creep testing machine is simple to operate and convenient to use.

Description

technical field [0001] The invention belongs to the field of creep testing machines. Background technique [0002] In the field of mechanical engineering, creep is a phenomenon in which the strain of a solid material increases with time under the condition of keeping the stress constant. Creep may occur when a solid material is subjected to a yield stress lower than the material for a long time. This phenomenon can occur at any temperature, but it is more serious when the solid material is subjected to high temperature for a long time and the temperature is close to its melting point. [0003] By applying pressure to a material, an initial strain occurs and the stress-strain modulus can be obtained. The material will start to deform over time and even fail by yielding. The creep rate decreases very rapidly in the initial stage, and then reaches the steady-state creep stage, where the creep rate increases rapidly and fracture occurs. In the second stage, the stress remains...

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Problems solved by technology

[0010] The mentioned methods have the following disadvantages: 1) the effect of the fluid acting on the sample to be tested cannot be analyzed in the creep test; 2) the strain is measured by mechanical methods, such as strain gauges or linear displacement transducers, which are difficult to measure in the Works stably inside liquids or under high pressure

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