Mechanical Behaviors Analysis and Johnson-Cook Model Establishment of 4Cr13 Stainless Steel

Abstract

The stress-strain curves, mechanical behaviors, and Johnson-Cook model of 4Cr13 stainless steel were investigated at both the strain rates from 0.001s-1 to 7000s-1 and the temperatures from 293K to 673K based on the electronic universal testing machine and the split Hopkinson bar. The results showed that 4Cr13 stainless steel was very sensitive to the temperature and the strain rate. The temperature sensitivity factor decreased with increasing the temperature, and the strain rate sensitivity factor increased with increasing the strain rate. Both the temperature sensitivity factor and strain rate sensitivity factor decreased with increasing strain. The flow stress increased with strain rate and strain, but decreased with temperature. The J-C model prediction had a good agreement with the experimental stress-strain in the wide range of temperatures and strain rates. The Johnson-Cook model gave the foundation for finite element analysis during the cutting process.

Influence of Ball Bearing Size on the Flight and Damage Characteristics of Blast-Driven Ball Bearings

“…This new model improved on prior work [17] by including failure criteria to examine the damage evolution in the ball bearing. The Johnson-Cook strength parameters and maximum principal stress failure criteria used for the SS420 [29] are presented in Table 3. Numerical pressure gauges were placed at 0.4 mm intervals across the rear face of the blast tube and gauges were placed at regular intervals inside the ball bearing to examine the stress fluctuations at four approximate locations within the bearing during the blast event and subsequent flight (indicated in Figure 4b).…”