*2.1. Material Flow Elaboration*

Firstly, the part production processes were analyzed, and Figure 2 was elaborated based on previous studies [5,18,19] while considering the material composition of a generic vehicle (Honda Accord, Internal combustion engine vehicle, 2011 [18]). Here, the mass percent of the material composition of the vehicle and the principal part production process they are subjected are clarified. The mass of the vehicle parts made by determined processes can be calculated through Equation (1):

$$G\_{m,i} = G\_{\text{velh}} \* GR\_{\text{w}} \* GR\_{\text{m,i}\_{\prime}} \tag{1}$$

where *Gm*,*<sup>i</sup>* is the mass of vehicle parts made by material m and formed through productive process i, *Gveh* is the mass of the vehicle, adopted as 1481 kg [18], *GRm* is the mass ratio of material m of a vehicle, and *GRm*,*<sup>i</sup>* is the mass ratio of material m of a vehicle that is subjected to part production process i.

**Figure 2.** Material composition of a vehicle and its principal part production process.

Moreover, the material that is consumed in each analyzed part of the production process is calculated through Equation (2):

$$GMC\_{m,i} = G\_{m,i} \* MC\_{m,i} \tag{2}$$

where *GMCm*,*<sup>i</sup>* is mass of material m consumed in productive process i, *MCm*,*<sup>i</sup>* is the mass of material m consumed in production process i per mass of product (process output), as shown in Table 1.


**Table** 

