What is the Bolderon pressure form?

The Bourdon tube pressure gauge is also known as a spring tube pressure gauge, as it was invented by the French genius mechanic Eugene Bourdon (1803–1884). Bourdon invented the mercury-free metal tube pressure gauge in 1851; he used a \"C\"-shaped metal tube with one end fixed to detect changes in pressure. Pressure measurement technology has also undergone significant changes, especially due to the influence of electronic technology, new processes, and new materials, resulting in the emergence of various new types of pressure measuring instruments. However, all of the new generation of pressure measuring instruments require power supply. However, thanks to its many advantages such as simplicity and reliability, low cost and ease of use, good linearity, and the fact that it does not require electricity, the Bourdon tube pressure gauge has maintained its status as a standard instrument for over 150 years. A Bourdon tube pressure gauge is a type of elastic pressure gauge whose sensing element is a Bourdon tube, which comes in two types: single-coil and multi-coil. Single-loop spring tube: One end of the tube is fixed to the instrument housing, while the other end is closed and can move freely. When the pressure to be measured is applied inside the bent pipe, the pipe deforms. Its free end undergoes displacement, the magnitude of which is proportional to the pressure being measured. When a displacement occurs, a transmission mechanism such as links and gears is used to drive the pointer to indicate the magnitude of the pressure being measured. Multi-turn Bourdon tube: The lower end of the Bourdon tube is fixed to the instrument housing, while its upper end is connected to a rotating shaft. When pressure is applied, the Bourdon tube deforms, causing the rotating shaft to spin; the degree of rotation is proportional to the magnitude of the pressure being measured, thereby indicating the value of that pressure. Compared to diaphragm and bellows pressure gauges, it offers advantages such as high precision, a wide measurement range (capable of measuring high, medium, and low pressures), and a high proportional limit. Measure the pressure or vacuum level of liquids, gases, and vapors that do not cause corrosion to copper, steel, and their alloys. The sensitive element of a Bourdon tube is an elastic C-shaped tube that is bent into a circular shape, with an elliptical cross-section. The pressure of the medium being measured acts on the inner side of the Bourdon tube, causing its elliptical cross-section to tend toward a circular shape. Due to the slight deformation of the Bourdon tube, a certain ring stress is generated, and this ring stress causes the Bourdon tube to expand outward. Since the head of the elastic Bourdon tube is not fixed, it undergoes slight deformation. The extent of this deformation depends on the pressure of the medium being measured; the deformation of the Bourdon tube is used, indirectly through the movement of the hands, to indicate the pressure of the measuring medium. A C-shaped Bourdon tube with an angle of approximately 250 degrees can be used to measure pressures of around 60 bar. For higher pressure levels, threaded or screw-type Bourdon tubes are generally used. Bourdon tubes have certain limitations when it comes to overpressure protection. In more complex measurement systems, Bourdon tube pressure gauges can be used in combination with chemical seals. The pressure measurement range of these gauges is from 0...0.6 to 0...4000 bar, with a measurement accuracy of 0.1% to 4.0%. In my opinion, it is merely one method of measuring pressure. As for the Borden pressure form, no specific textbook introductions have been found! Those who are familiar with Haiyou can please explain!

I think what LZ is referring to should be the Borel effect, rather than calling it a “Borel pressure form.” If we talk about “forms,” then the Borel pressure would be divided into “three categories,” but that’s not actually the case. In the CAESAR ii settings, there is an option for Borel pressure, with three choices: 1. none, meaning no account is taken of the Borel effect; 2. trans only, meaning only translational effects are considered; 3. trans+rod, meaning both translational and rotational effects are taken into account. The Borel tube pressure gauge mentioned by the second poster is likely a mechanical pressure gauge that makes use of the rotational properties of the Borel effect. As for the example of pressure causing the tube to elongate, I seem to have seen it in some forum before, but I can’t remember exactly where. To understand the detailed theory, one would need to look it up carefully. I think that’s what it means; I’m not sure if this helps