## 1 Introduction
[27] investigated the mechanical properties of the titanium alloy Ti6 Al4V through the SHPB test and the quasi-static tensile test to determine the parameters for the classical J-C constitutive model. [PERSON] [25] presented a methodology to determine the deformation behavior of working materials under high-strain-rate metal cutting conditions by utilizing evolutionary computational methods to identify constitutive model parameters. The J-C constitutive model is mostly obtained through SHPB experiments; the J-C constitutive parameters for materials of the same composition are similar. Although several studies regarding the constitutive of J-C materials on titanium alloys through SHPB or other methods have been conducted, the specific constitutive parameter values shown in Table 1 are different. Further analysis indicates that some parameters are significantly different. The maximum initial yield stress \(A\) (1098 MPa [10]) increased by 50% compared to the minimum initial yield stress \(A\) (742 MPa [28]). The highest strain hardening parameter \(B\) (1092 MPa [29]) was 229% larger than the lowest strain hardening parameter \(B\) (331.2 MPa [30]). Similarly, the strain rate sensitivity coefficient \(C\), thermal softening coefficient \(m\), and hardening coefficient \(n\) differ significantly in various studies. The difference in the J-C constitutive coefficients for the same Ti6 Al4V material in various studies is mainly due to the differences in the experimental conditions and methods [31; 32]. As shown in Table 1, the method to obtain the J-C constitutive constant is different, and the SHPB test corresponds to the mainstream method. For the same SHPB test method, the J-C constitutive constants that are obtained are different due to the various experimental conditions. Varying reference strain rate parameters, strain rate change gradients, and temperature change gradients were used in different studies. The actual stress-strain curves obtained from the tests are slightly different, as well as the J-C constitutive constants. Different J-C constitutive constants of Ti6 Al4V were used for cutting simulation in several references [14; 41]. [PERSON] et al. [42] analyzed the two-dimensional elastoplastic viscoplastic finite element simulation of the formation of zigzag chips in the micro-milling of Ti6 Al4V titanium alloy; the J-C constitutive constant of Ti6 Al4V proposed by [PERSON] et al. [33] was used. [PERSON] et al. [43] proposed a hybrid approach for the prediction of cutting forces in the micro end milling of titanium alloy Ti6 Al4V by finite element simulation; the J-C constitutive constant of Ti6 Al4V proposed by [PERSON] et al. [33] was used. [PERSON] et al. [44] established the one-tool and double-tool cutting models based on the coupling Eulerian-Lagrangian (C.E.L.) finite element (F.E.) method; the J-C constitutive constant of Ti6 Al4V proposed by [PERSON] and [PERSON] [29] was used. [PERSON] et al. [45] proposed an analytical model of chip formation for an accurate prediction of the orthogonal cutting of Ti6 Al4V; the J-C constitutive constant of Ti6 Al4V proposed by [PERSON] [30] was used. [PERSON] et al. [46] established the finite element modeling of burr formation in the high-speed micro-milling of Ti6 Al4V; the J-C constitutive constant of Ti6 Al4V proposed was from [PERSON] et al. [28]. Moreover, [PERSON] et al. [47] developed an analytical model to predict the position and shape of the dead metal zone in the micro-cutting process; the J-C constitutive constant of Ti6 Al4V proposed was from [PERSON] et al. [28]. [PERSON] [48] developed a predictive cutting force model for the cryogenic machining of Ti6 Al4V; this model adopted the J-C constitutive constant proposed by [PERSON] et al. [39]. [PERSON] et al. [49] derived a new analytical formula for the friction coefficient at the tool-chip-workpiece interface. They applied it in the high-speed machining simulation of Ti6 Al4V, the J-C constitutive model of Ti6 Al4V proposed by [PERSON] [33] was used in the cutting simulation modeling. [PERSON] et al.