CN87205653U

CN87205653U - Mechanical double directions tensile tester

Info

Publication number: CN87205653U
Application number: CN 87205653
Authority: CN
Inventors: 茹长渠; 李冈陵
Original assignee: HUANAN POLYTECHNIC COLLEGE
Current assignee: HUANAN POLYTECHNIC COLLEGE
Priority date: 1987-03-28
Filing date: 1987-03-28
Publication date: 1987-12-02

Abstract

The utility model provides an instrument for giving a two-way stretching test for metal or other composite materials. The utility model can directly give the two-way stretching test or a corresponding fatigue test through four hinged sway rods by means of a cross lading head which is provided with a universal head on the top on a universal tester, a pressure testing machine or a low frequency fatigue tester. The utility model is a tester suitable for being used for majors, such as mechanics, civil engineering, dynamics, composite material, etc. in colleges and universities and middle schools, corresponding factories and research units.

Description

Mechanical double directions tensile tester

The utility model is the instrument that is used for metal or various compound substance test specimen are carried out biaxial tensile test.The external two-way stretch fatigue tester that uses at present adopts the fluid pressure type transmission usually, and mechanism is huge, and complex structure involves great expense, and the domestic unit that does not also produce the biaxial tensile test machine so far.So what the laboratory of institution of higher education, factory and R﹠D institution generally used is universal testing machine and uniaxial pressure testing machine, is difficult to carry out biaxial tensile test.

The purpose of the utility model design be produce a kind of simple in structure, easy to operate, cost is low, it is placed on the one directional tensile test machine (universal testing machine, pressure testing machine and low-frequency fatigue test machine etc.), utilize its loading system, the instrument that can carry out biaxial tensile test (or two-way stretch torture test) to metal (or various compound substance) test specimen.

The main points of the utility model design are: the hounds of symmetry are hinged mutually with four respectively by four hinges to utilize cross loading head that a top is equipped with Universal-head, the lower end of each hound is hinged with strain-type force sensor respectively again by hinge, needs by different biaxial stress ratios, the length of selected hound, make it become certain included angle with force cell, (preferably 27 °～50 °), the outside end of strain-type force sensor has the guide pole that passes cross bearing support tail end support plate, be with buffering (a resetting) spring on the guide pole, each force cell lower end all has a vertical groove, between each groove and the cross base, all have and supporting survey power and pass the roller that sense device And slides it before and after can be on the cross base; A force cell end inwards is the test specimen chuck; Force cell links by dress connection plug and dynamic strain indicator thereon.

Below in conjunction with accompanying drawing this utility model is described in further detail, accompanying drawing is the structural representation of mechanical biaxial tension tester.

(1) is Universal-head, (2) be cross loading head, (3) are hound, and (4) are force cell, (5) be guide pole, (6) for the rolling cylinder, (7) have the cross base of support plate for tail end, and (8) are buffering (resetting) spring, (9) be the strainmeter connection plug, (10) be dynamic strain indicator, (11) are digital printer, and (12) are the cross test specimen.Its principle of work is that this test instrument is installed on the pressure testing machine, utilize the loading system of pressure testing machine, Universal-head (1) imposed load to cross loading head (2) top of biaxial tension tester, after the cross loading is stressed, by hinged four hounds (3) strain-type force sensor (4) is strutted, this moment, sample was subjected to the two-way horizontal action of pulling stress simultaneously.The connection plug (9) of four strain-type force sensors and dynamic strain indicator links, and just can measure the two-way tension of sample simultaneously by strainmeter and digital printer.Stressed when destroying when sample, buffering (resetting) spring (8) just promotes force cell and is back to original position, thereby reaches the purpose that resets.

According to concrete test request, can change the angle between itself and the force cell by the length that changes hound, thereby reach different biaxial stresses than (σ ₁: σ ₂The test request of=1:1～1:2), usually, the angle of force cell and hound is 27 °～50 °, force cell strut and reseting procedure in, rolling cylinder (6) plays supporting and guide effect respectively with guide pole, as this biaxial tension tester is placed on the low-frequency fatigue test machine, work by low-frequency fatigue test machine, cross loading head is moved up and down, when cross loading head moves downward, promoting four hounds opens, make sample be subjected to two pairs of tensions along both direction simultaneously, the screen resilience owing to sample and buffering (resetting) spring makes sensor play a part to reset then, and cross loading head is moved upward, so repeatedly, with regard to the two-way stretch low-cycle fatigue life or the fatigue limit of energy measurement sample.

The novel biaxial tension tester of this kind is simple in structure, reasonable in design, and cost is low, and precision height, and good stability are highly suitable for high and medium universities and colleges laboratory, factory and R﹠D institution and use. It will play immeasurable effect to the development that promotes two-way stress measuring technique. Through with the World Patent Index database of U.S. DIALOG system and the online information retrieval of " United States Patent (USP) " database, find no the record identical with the utility model.

Claims

1, a kind of mechanical biaxial tension tester, it is by Universal-head (1), cross loading head (2), hound (3), strain-type force sensor (4), guide pole (5), rolling cylinder (6), cross base (7), buffering back-moving spring (8), strainmeter connection plug (9), dynamic strain indicator (10) and digital printer (11) are formed, it is characterized in that: cross loading head is hinged with four symmetrical mutually hounds respectively by four hinges, the lower end of every hound is hinged with strain-type force sensor respectively by hinge, hound and force cell are angled, the outside end of strain-type force sensor is the guide pole that passes cross bearing support tail end support plate, be with buffering (a resetting) spring on the guide pole, each force cell lower end all has a vertical groove, between each groove and the cross base, all have and supporting survey power and pass the roller that sense device And slides it before and after can be on the cross base, a force cell end inwards is the test specimen chuck, and force cell links by dress connection plug and dynamic strain indicator thereon.

2, the described mechanical biaxial tension tester of claim 1 is characterized in that the top of described cross loading head a Universal-head being housed.

3, claim 1 or 2 described mechanical biaxial tension testers, the angle that it is characterized in that the described every its corresponding force cell of hound is 27 °～50 °.