CN103017954A

CN103017954A - Measuring method for plate stress field

Info

Publication number: CN103017954A
Application number: CN2011102883068A
Authority: CN
Inventors: 徐春广; 李骁; 潘勤学; 肖定国; 杨向臣; 徐浪; 郭军; 宋文涛
Original assignee: Beijing Institute of Technology BIT
Current assignee: Beijing Institute of Technology BIT
Priority date: 2011-09-22
Filing date: 2011-09-22
Publication date: 2013-04-03
Anticipated expiration: 2031-09-22
Also published as: CN103017954B

Abstract

The invention relates to a measuring method for a plate stress field. Sensor probes are distributed in an area the plate stress of which is to be measured to form a square and an array. Time-sharing measurement of the value and the direction of the plate stress of each array line is performed by a multicircuit switch and a pulse receiving and transmitting card under the action of an internal program of an industrial personal computer. Finally, each set of measurement data is synthesized by orthogonal decomposition to form the distribution of the intensity and the direction of the stress field of the to-be-measured area. Compared with the traditional measuring method for plate stress, the method disclosed by the invention increases the measurement efficiency, simplifies the operation, is capable of providing the distribution situation of the stress field of the specified area and has wide applicability.

Description

A kind of dull and stereotyped stress field method

One, technical field

The present invention relates to a kind of dull and stereotyped stress field method.It is high that the method is measured efficient, can provide regional stress field size to be measured, direction and distribution situation, simple to operate, the high speed that is particularly suitable for dull and stereotyped Stress Field Distribution is measured and is analyzed, can be widely used in Aeronautics and Astronautics, weapon, automobile, etc. the dull and stereotyped stress field in field and analysis.

Two, background technology

Residual stress measuring method mainly contains Mechanical Method and Physical.Wherein, Mechanical Method can cause damage to structure, and the stress that is not suitable for the non-destructive structure detects; Physical mainly comprises X-ray diffraction method, method of magnetic, neutron diffraction method and ultrasonic method etc., considers security and portability, and ultrasonic method is with the obvious advantage in numerous Non-Destructive Testing strain method.

Traditional methods that one one of ultrasonic method Non-Destructive Testing strain method employing is received or pair is received detect and are parallel to sensor orientation, between the probe stress value in narrow and small zone size and draw, pressure condition, measurement efficient is low, be not suitable for large scale measurement, can't provide the actual distribution state of regional stress field to be measured.The method of simple dependence sensor array probe also just becomes one-shot measurement simultaneously repeatedly to be measured, and also can't provide the actual conditions of stress area.

Three, summary of the invention

The purpose of this invention is to provide a kind of dull and stereotyped stress field method.Relate to the square array sensor probe and measure dull and stereotyped stress field, measurement data is depicted as the stress field grid, way by Orthogonal Decomposition is synthesized focal stress value size, direction, tension and compression state in the grid, judge stress field actual stress distribution situation, solved the problem that dull and stereotyped stress field earning performance is analyzed, for the measurement of plate Stress Field Distribution rule provides a kind of new thinking.

The present invention is achieved in that

A kind of dull and stereotyped method for measuring stress, the quadrate array that forms 8 probes in every limit with 32 ultrasonic transducers around the center magnetic bases, the probe wire on every limit forms a group pattern probe wire bundle and accesses in No. 16 multicircuit switches, No. 16 multicircuit switches are connected with the pulse card feeding-discharging by data line, and the pulse card feeding-discharging is connected with the industrial computer control system by data line.

After the test beginning, the industrial computer control system is sent signal, the gating pulse card feeding-discharging sends and receives pulse data and controls a road of multicircuit switch and connect, sensor gathers one road stress value information back industrial computer control system, so circulation is 16 times, namely obtains horizontal 8 lines of region of stress concentration, vertical 8 stress value information corresponding above the line.Industrial computer system calculates this flat board stress area stress distribution size, direction equal stress state according to 16 road stress value information analyses that gather.

When one group of stress area test is finished, this array can the center magnetic bases be that axle rotates arbitrarily angled other direction position measurements of carrying out, after unclamping magnetic bases, can change other zones and test, thereby finish successively the test of wider dull and stereotyped stress field stress distribution.

The stress equivalence proper orthogonal decomposition that the present invention proposes can well solve the problem of rear 16 the line of tension analysis-by-synthesis of test, and corresponding line of force measurement is converted into planar survey and has good effect.

Four, description of drawings

The dull and stereotyped stress measurement system schematic diagram of Fig. 1

Fig. 2 stress point is chosen schematic diagram

Fig. 3 stress equivalence Orthogonal Decomposition schematic diagram

Description of reference numerals is as follows: array probe bundle conductor 1, data line 2, probe 3, No. 16 multicircuit switches 4, pulse card feeding-discharging 5, magnetic bases 6, base switch 7, industrial computer control system 8.

Five, embodiment

The below is elaborated to the specific embodiment of the present invention:

Such as Fig. 1, behind the selected stress area to be measured magnetic bases 6 are placed wherein and screw switch from the position 1 to the position 2, magnetic bases tightly are adsorbed on the flat board.Around magnetic bases 6, be square array 8 on every limit totally 32 probes 3 formed stress array measurement matrix.8 of every limit probes of square 3 are introduced array probe bundle conductor 1 with wire, four group pattern probe wire bundles 1 access in No. 16 multicircuit switches 4 in order, No. 16 multicircuit switches 4 are connected with pulse card feeding-discharging 5 by data line 2, and pulse card feeding-discharging 5 links to each other with industrial computer control system 8 by data line 2.

Such as Fig. 2, after the test beginning, under 8 effects of industrial computer control system, No. 16 multicircuit switches 4 are opened every group of measuring circuit successively, square opposite side over against probe gather successively its corresponding stress area interior lines stress intensity and direction.After 16 pairs of sensor probes 3 were measured end, industrial computer control system 5 had namely been stored 16 groups of stress values sizes, directional data, that is:

σ _L1|L19，σ _L2|L18……σ _L10|L11；σ _R2|R12，σ _R3|R13……σ _R10|R20。With this 16 groups of stress values size, direction is equivalent be size, the direction of power, namely can carry out Orthogonal Decomposition to it, for example: get A place, Fig. 2 position, the horizontal stress value is big or small, direction is (tension); Vertical direction stress value size, direction are (tension).Such as Fig. 3, the final stress size and Orientation of this point can synthesize so, oblique 45 ° of direction, tensile stress state.In like manner, 81 line of tension intersection point stress value sizes, stress directions get final product corresponding obtaining in the square matrices, and the dull and stereotyped Stress Field Distribution rule of this regional location can be analyzed thus.When whole regional stress field is completed, unclamp the magnetic bases switch by position 2 to position 1, rotate the square matrices certain angle and can measure next angle position Stress Field Distribution rule.After this zone integrated stress analysis of distribution is finished, namely be movable to other positions and carry out stress analysis.

The method is measured simply, data capacity is large, it is high to measure efficient, can be widely used in the dull and stereotyped stress measurement analysis fields such as Aeronautics and Astronautics, navigation, weapon, automobile.

Claims

1. dull and stereotyped stress length measuring method, it is characterized in that: get the square array that 32 ultrasonic transducer probes form 8 probes in every limit, every road break-make is controlled in No. 16 multicircuit switch timesharing, gathers each circuit-switched data by the pulse card feeding-discharging, and the industrial computer control system is carried out data and processed.

2. 32 ultrasonic transducer probes according to claim 1 form the square array on 8 on every limit, and its composition is not limited only to 32 probes, also can be more or still less; The square array of 8 probes in every limit that form is not limited only to this form, also can be hexagon, octagon even circle.

3. multicircuit switch according to claim 1, its number of switches depends on the quantity of sensor probe, is not limited among the present invention 16 tunnel design.

4. pulse card feeding-discharging according to claim 1 is characterized in that the data that can realize high frequency send and gather, and volume is small and exquisite, and integrated level is high.

5. industrial computer control system according to claim 1, its implementation is not limited only to industrial computer.