## 5 Conclusions  
In this study, a theoretical model was developed to calculate the distribution of the characteristic plastic flow parameters of an SCJ. This model can be used to theoretically predict the distribution patterns of the strain, strain rate, temperature, and flow stress of the jet formed from the liner made of any material and of any shape at any given time during its  
Figure 14: Microstructural morphology of Mo. (**a**) Initial structure; (**b**,**c**) Slug structure; (**d**–**f**) Jet structure.  
formation process. Jets formed from OFHC-Cu and Mo were comprehensively compared in terms of their PD behavior through theoretical analysis, numerical simulations, and experimental investigations. The results of this study are as follows:  
(1) The developed theoretical model was effective in predicting the PD behavior of the SCJ and the distribution patterns of the relevant characteristic parameters. Comprehensive analysis revealed that the PD environment of the material varied considerably between different parts of a jet during its formation.  
(2) At any given time point, the distribution of the plastic strain differed considerably in both the longitudinal and transverse directions of a jet, with the most intensive material occurring at the center. The deformation strain rates of the liner materials during the collapse stage were theoretically predicted to range from 0.8 \(\times\) 10\({}^{5}\) to 1.6 \(\times\) 10\({}^{5}\) s\({}^{-1}\). The distribution patterns of the strain and strain rate of a jet were affected primarily by the warhead structure. In the presence of the same warhead structure, the two materials did not differ considerably in terms of the distribution of the strain and strain rate.  
(3) The average temperatures of the OFHC-Cu and Mo jets 40 \(\upmu\)s after detonation were theoretically predicted to be 804 and 2277.8 K, respectively. These results agreed adequately with the numerical simulation results. The measurements obtained in the recovery experiment revealed average strengths of 144.32 and 286.66 MPa for the OFHC-Cu and Mo jets, respectively. The theoretical model predicted flow stresses of 193.1 and 344.3 MPa for the two jets, respectively. These two sets of data differed numerically by 34% and 20%, respectively.  
(4) Both materials underwent dynamic recrystallization to varying degrees during the jet-formation process. In both cases, the material was more intensively recrystallized in the jet than in the slug. Moreover, the crystal grain size of the Mo jet decreased from the initial 44.7 \(\upmu\)m to 7.82 \(\upmu\)m, whereas the crystal grain size of the OFHC-Cu jet decreased from the initial 95.6 \(\upmu\)m to 2.2 \(\upmu\)m.  
Conceptualization, W.L.; Methodology, P.S.; Validation, J.L. and Q.Z.; Resources, W.L. and Q.Z.; Data curation, P.S.; Writing--original draft, P.S.; Writing--review & editing, Z.W.; Supervision, J.L. All authors have read and agreed to the published version of the manuscript.  
This research received no external funding.  
The study did not require ethical approval.  
The study did not involve humans.  
Data Availability Statement: Data is unavailable due to privacys.  
The authors declare no conflict of interest.