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1. 34 mm, subjected to uniaxial tension resulting from an axial elongation of 14 mm. This example serves here as a testbed for the plastic algorithm developed in DynELA. The material considered here is a special steel (A533, Grade B, Class 1), with a general 304 O. Pantale´ / Advances in Engineering Software 33 (2002) 297–306 Table 2 Material properties of the OHFC copper rod for the Taylor test Young’s modulus Poisson ratio Density Initial flow stress Linear hardening Fig. 4. Necking of a circular bar: final meshes obtained for 50 (left) and 400 (right) elements.

The main purpose of this FEM development is to serve as a testbed for new and more efficient algorithms related to various parts of a FEM program, such as new contact algorithms (here, the contact is included but has not been presented) or more efficient constitutive integration schemes. One of the main advantages of the present FEM code is that the class hierarchies adopted allow the implementation of additional constitutive models such as new constitutive laws, new elements or contact laws by derivating this new feature from existing one using the inheritance feature.

The flowchart for the explicit time integration of the Lagrangian mesh is given in Box 1. 3. Object-oriented design Object-oriented calculations have received extensive attention in computational mathematics and several engineering applications have already been published in computational journals. The benefits of OOP to implementation of FEM programs has been explored by Miller [8] and Mackie [9], and more recently applied to a Lagrangian analysis of thermo-plasticity coupled with ductile damage at finite strains by Zabaras and Srikanth [10].

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