FCC-50 multifunctional crack propagation rate testing machine

FCC-50 multifunctional crack propagation rate testing machineEquipment Description:

FCCMulti functional crack propagation rate（CGR）The testing machine is used for corrosion fatigue loading and crack propagation length measurement of materials in corrosive environments. Crack propagation measurement adoptsDCPDLaw can be applied in corrosive media environments.

Continuous corrosive environments include: high temperature, high pressure, purified water (temperature)0-650℃, pressure0-35Mpa）Water environments containing trace amounts of alkalinity, acidity, and salts can also be used for higher concentrationsNaOHTheNa₂CrO₄TheN₂O₄TheHNO₃TheNH₃OHTheH₂STheCOTheCH₄IncludingCl^-The corrosive environment of solutions, methanol, phosphate hydraulic oil, acetic acid and other media requires consideration of the service life of the high-pressure reactor system when the concentration of some media reaches a certain level.

The required material for the experimental kettle is determined based on the temperature and pressure of the medium and its environment. The metal corrosion high-pressure reactor and its associated hydrochemical control system achieve reliable control of temperature, pressure, hydrochemical control, and water circulation.pHTheDOThe conductivity is controllable across the entire range.

FCC-50 multifunctional crack propagation rate testing machineFactors affecting fatigue crack propagation
Influencing factors related to materials
(1) The type of material product. Such as sheet metal, extruded parts, forgings, etc. For the same material, if the product types are different, there will be significant differences.
(2) Heat treatment process. The same material composition but different heat treatment processes can lead to differences in the microstructure of the material, thereby affecting the resistance of the material to crack propagation and causing differences.
(3) Thickness. Constructions made of the same material with different thicknesses result in different stress states of the material near the crack *, with an increasing trend as the thickness increases.
2. Factors related to the environment
(1) Corrosive medium. Corrosion fatigue crack propagation includes two mechanisms of crack propagation: the propagation rate of crack length over time under stress corrosion and the fatigue crack propagation caused by alternating loads. The crack propagation rate under corrosive conditions is usually higher than the fatigue crack propagation rate in an inert gas environment (dry air), and is related to the loading frequency and waveform.
(2) Temperature. Because the plastic behavior of materials is temperature dependent, cyclic plastic deformation is more likely to occur at higher temperatures and will increase. The fatigue crack propagation rate at high temperatures is also closely related to the loading frequency and waveform.
(3) Load frequency and waveform. Under inert environment (dry gas) and room temperature conditions, the effect of frequency on the commonly used loading frequency is not significant. The influence of the load waveform on the inert environment and room temperature is not significant. Under the same corrosive medium and/or high temperature conditions, the lower the frequency, the larger and more significant the changes, and the influence of the waveform cannot be ignored. The larger the frequency and the longer the application time in one cycle, the greater the effect.

FCC-50 multifunctional crack propagation rate testing machine

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