An expert system for the determination of creep constitutive equations based on continuum damage mechanics

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Abstract
Methods have been developed for the determination of a suitable stress range over which uniaxial creep tests should be carried out in order to find the best constitutive equations for the material. The method is based on a proposed empirical relation and Ashby deformation mechanism maps. An automatic data logging system has been developed for the capture of uniaxial creep test data and a robust and reliable optimization scheme has been devised for the determination of the creep constitutive equations for a material. The above methods have been combined in an expert system that enables the user without specialist knowledge to carry out uniaxial creep tests to determine the best creep constitutive equations for a material. The system is stored on two floppy disks and is run from any IBM compatible microcomputer. The expert system has been used to determine the creep constitutive equations for copper.

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