ESTABLISHMENT OF A MULTI-PARTICLE EROSION MODEL BASED ON THE LOW-CYCLE FATIGUE LAW - AN EXPERIMENTAL STUDY OF EROSION CHARACTERISTICS

摘要

In order to obtain a multi-particle erosion model for the prediction of the erosion law of plastic metal walls considering material hardening, the low-cycle fatigue theory and a single-particle erosion model are theoretically combined. In addition, a gas-solid jet experiment wherein the number of particle impacts can be controlled is performed to identify the variation in the material hardness and erosion rate with particle impact times. The experiment tests the change of surface hardness and material loss rate, and obtains the key coefficients in the model and critical impact times of material loss by varying the particle impact number and the impact velocity. Results show that the local yield strength of the material surface will increase because of the hardening effect exerted by the particle impact. Surface hardening results in a logarithmic reduction in the erosion rate with an increase in particle impact number. In addition, there is a critical particle time, which corresponds to material loss and nonlinearly decreases with the increase in the impact velocity, that leads to material loss.