SU1428990A1 - Arrangement for testing tubular specimens - Google Patents

Abstract

The invention can be used to study the strength properties of tubular specimens by loading them with internal pressure. The aim of the invention is to expand the operational capabilities by providing a device redesign for testing specimens with different diameters and increasing durability by eliminating contact of the sheath with the destructive specimen. The annular elastic shell 3 is sealed to the mandrel 1 and communicated with the pressure source by Channel 2. The elastic sheath 3 oitBa- is a non-expanding sheath 5, one end of which is fixed to the mandrel 1 stationary and the other with the possibility of moving and fixing the position. Entering the device into sample 8 and filling the working medium under pressure with an elastic sheath 3, load the sample 8, and the length of the annular loading surface will be limited by a non-expanding sheath 5. 1 or more. (L with

Description

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The invention relates to a test apparatus, in particular to devices for testing tubular specimens for examining their strength properties by loading with a force radially distributed over an inner annular surface of limited length.

The purpose of the invention is to expand the operational capabilities by providing test samples with different diameters and increasing durability by eliminating the contact of the elastic sheath with destructive specimen 4.

: The drawing shows the proposed device.

The device for testing tubular-fbix specimens contains a mandrel 1 with a swing 2 for supplying the working medium, an annular elastic sheath 3, hermetically mounted on the mandrel 1 and communicating with a pressure source tne is shown) with channel 2 in which valve 4 is installed. The limiter is tightened in the form of a non-expanding cover 5 enveloping the shell 3. One end of the cover 5 is rigidly fixed to the end of the mandrel 1 with a nut b, the other end of the cover 5 is fixed to the sleeve 7 mounted on the mandrel 1 with the possibility of moving along its axis and fixing her by dix. The sleeve 7 is centering for the tubular sample 8.

The device works in the following way.

Depending on the internal diameter of the test tube sample 8 and a given length of the annular loading surface,

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the required length of the cover 5, moving the sleeve 7 along the axis of the mandrel 1 and fixing its position on it. The device is introduced into the sample 8. The centering of the cover 5 relative to the inner surface of the sample 8 is realized by the sleeve 7. Open the valve 4. The working medium is fed into the cavity of the elastic shell 3. Inflated, elastic, the shell 3 loads the sample 8, while the length of the annular loading surface will be limited by the increasing cover 5.

Rapid adjustment of the device allows testing of tubular specimens with different internal diameters. The presence of a non-expanding cover 5 eliminates the contact of the elastic sheath 3 with the destructive specimen 8, which increases the durability of the elastic sheath 3 and, consequently, the device.

Claims (1)

Invention Formula A device for testing tubular specimens with internal pressure, containing a mandrel with a channel for supplying a working medium, an annular elastic sheath, hermetically mounted on the mandrel and communicated with the channel, a stop, in contact with the ends of the shell mounted on the mandrel with the possibility of moving along the axis and fixing the position This is what, in order to expand operational capabilities and increase durability, the limiter is made in the form of a non-expanding cover that covers the shell.