torsion spring resilience force

Cnomax pogo pin factory SPRING ENGINEER WILL TELL YOU THAT THE STRAIN LAGS BEHIND THE STRESS WHEN THE ELASTIC ELEMENT OF a TORSIONAL SPRING VIBRATES PERIODICALLY, RESULTING IN A HYSTERESIS LOOP IN THE STRESS-STRAIN CURVE (FIG. 1). The area enclosed by the hysteresis ring is equal to the energy consumed in a cycle of vibration, which is converted into heat loss, this phenomenon is called internal friction or damping, denoted by Q. The inverse of the torsional spring is called the mechanical quality factor and is denoted by Q. In practical application, there are different requirements for the internal friction characteristics of metal materials. For the spring of shock absorption, the internal friction value of materials is required to be as large as possible to reduce the stress amplitude of resonance as soon as possible. The elastic element used in the filter oscillator and tuning fork oscillator should have as little internal friction as possible, that is, the greater the mechanical quality factor, the better. Internal friction of metal materials mainly depends on chemical composition and structure, but cold working increases internal friction and annealing reduces internal friction. Figure 1 single Elastic hysteresis ring for cyclic loading

Beta = beta G = E - 6

Where: βE -- temperature coefficient of elastic modulus, 10×/℃-6

βG -- temperature coefficient of shear elastic modulus, ×10/℃ t1, t2 -- temperature, ℃.

The elastic modulus temperature coefficient of metals and alloys, like the linear expansion coefficient, is a physical quantity closely related to the change of atomic spacing. The ratio between the two is a constant, i.e. Generally, the m of metals and alloys (except some ferromagnetic alloys) is about (40 ~ 42)×10, so it can be approximated by the value when the temperature variation range is not too large

Find the value of the torsional spring βE. Because it increases with temperature, the value of βG is generally smaller than the value of βE.