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Device and method for testing fastening pressure of shape memory alloy pipe joint

A technology of memory alloy and testing method, which is applied to measuring devices, force/torque/work measuring instruments, instruments, etc., can solve problems such as low reliability, high operating cost, and poor practicability, and achieve convenient operation and testing device Small and compact, solve the effect that cannot be directly measured

Active Publication Date: 2014-04-02
NANCHANG HANGKONG UNIVERSITY
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This evaluation method has high operating costs, low reliability, and poor practicability.

Method used

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  • Device and method for testing fastening pressure of shape memory alloy pipe joint
  • Device and method for testing fastening pressure of shape memory alloy pipe joint
  • Device and method for testing fastening pressure of shape memory alloy pipe joint

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Embodiment Construction

[0029] Such as figure 1 , figure 2 , image 3 , Figure 4 and Figure 5 As shown, the establishment of the calibration relationship of the fastening pressure involved in the present invention is realized in this way, which includes a connected pipe 1, an arc-shaped steel sheet 2, a loading block 3, a steel wire rope 4, a loading weight 5, a support frame 6, and a pulley 7 and strain gauges8. The inner wall of the connected pipe 1 is symmetrically pasted with strain gauges 8; the four arc-shaped steel sheets 2 are evenly attached to the outer periphery of the connected pipe 1 at the same height, and there is an equidistant gap between adjacent arc-shaped steel sheets 2; the curved steel sheets The outer periphery of 2 is welded with a loading block 3, which is used to convert the loaded weight into a force on the arc-shaped steel sheet, thereby realizing a series of known pressures on the outer surface of the pipe to be taken over; each loading block 3 is provided with Th...

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Abstract

The invention discloses a device and a method for testing thee fastening pressure of a shape memory alloy pipe joint. Two strain gauges are symmetrically adhered to the inner wall of a connected pipe and are connected with a dynamic strain tester. Four steel wire ropes penetrate through a groove of a loading block and fixed pulleys respectively, and weights are loaded at the tail ends of the steel wire ropes. Different pressures pi can be applied to the outer wall of the connected pipe by changing the weight of the loaded weights, and the strains epsilon i which are generated by the strain gauges adhered to the inner wall of the connected pipe under the action of the different pressures are tested through the dynamic strain tester, so that a curve of a calibration relation between the pressure p of the outer wall of the connected pipe and the strain epsilon of the inner wall is obtained. According to the calibration relation, the fastening pressure applied to the connected pipe by the shape memory alloy pipe joint in a heating recovery process can be conveniently tested.

Description

technical field [0001] The invention relates to a test of the fastening pressure of a shape memory alloy pipe joint, in particular to a test device and a test method for the fastening pressure of a shape memory alloy pipe joint. Background technique [0002] The traditional connection method of aircraft hydraulic, pneumatic and fuel systems is mainly flare connection, which is the most extensive and mature connection form. However, this connection method is heavy in weight and complex in structure, especially when it is connected with important load-bearing structures, it has a great impact on the static strength and fatigue strength of the structure, the process is complicated, and the reliability and safety are relatively poor. At present, the world's advanced aircraft manufacturing countries have widely adopted the non-flare connection method of shape memory alloy pipe joints, and my country's aviation, aerospace, nuclear power and other fields have also begun to adopt th...

Claims

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Application Information

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IPC IPC(8): G01L5/00
Inventor 鲁世强李贵发王克鲁刘俊伟
Owner NANCHANG HANGKONG UNIVERSITY
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