Abstract: A Computer Simulation of the deformation model of dual phase Steels has been performed. DDS Ⅲ (Digital Dynamics SimulatorⅢ) was used to program. In order to use DDS Ⅲthe technique used is to introduce a pseudo-ordinary-differential equation or delete　some statements related to integration from the source program. The simulation results demonstrate that the curve of uniform true strain of dual phase steels vs martensite volume fraction in dual phase steels is better than curve of uniform true strain of dual phase steels vs strength of dual phase steels for showing effect of component phase properties of dual phase steels on uniform true strain of dual phase steels. The Contradictory results in references were explained and way of increasing uniform true strain of dual phase steels was suggested.

Key words: dynamical characteristics, launch and recovery system, random irregular wave, statistical analysis, seafloor drill