Civil Engineering Reference
In-Depth Information
Fig. 5.4
Solution scheme
for solving the analytical
model [
1
]. The EAF model
is set such that all important
variables are established
first, and then the desired
compression stroke is divided
into increments at which the
model will output data for
each increment
strain and stress, and the complete state of stress and strain can be determined if
desired. The iteration continues until deformation reaches the desired value of the
stroke, or a failure criterion, such as the fracture limit, is reached.
5.1.9 EAF Modeling Approach Summary
This chapter presents an energy-based approach to analyze electrically assisted
forming (EAF). The input electrical energy is separated into the useful energy that
assists the mechanical deformation process, while the remaining energy is con-
verted to heat, causing thermal softening by way of resistive heating. The EEC
is created to account for the ratio of “usable” electricity compared to the overall
magnitude of applied electricity.
5.2 Simplified EAF Forging Model
In this section, the modeling strategy and different methods for determining EECs
is combined to produce a simplified EAF relationship model. This model predicts
stress-strain profiles and will be compared to experimental conventional/EAF
compression tests to verify accuracy. In addition, sensitivities of the model, and of
EAF in general, will be explained with supporting experimental results.
5.2.1 EAF Forging Stress-Strain Model
In this section and preceding subsections, an explanation of the simplified EAF
forging model is described and compared to experimental results. In particular, this
