A rate-inderpendent polyerystallme plasticity constitutive model considering sclf and latent hardening was develped. Next, a new orientation probabillity assignment method was proposed and the crystal orientations were assigned to FE integration points, which reprcenet crystals and can rotate individually. Then eup drwing of FCC aluninum sheet was studied usig erystalline plasticity finite fimite element analysis. The results show that the validity of proposed model is proved throuth compatison bet ween numerical results and experimental. For the roled aluminum sheetm which contains strong {001}<110> texture, caring is formed at 45

Aluminum alloy profile parts are widely used in the fields of aviation, equipment, automobile and ornamental industries. The construction method for "zero die trial" intelligent design system of aluminum extrusion die was studied based on KBE idea. An object-oriented knowledge language AEKL(Aluminum Extrusion Knowledge Language) was developed to construct intelligent knowledge model with three methods, frame, parameters and rules. On the aspect of knowledge reasoning, case-based reasoning was employed in addition to traditional rule-based reasoning method. API provided by CAD N17platform was used in geometry disposal. Finally, the corresponding protoyping system was established and an design example was shown.

Blank layout is one of the most imporant processes in stamping die design. As the major cost in sheet metal stamping is te material cost, any efforts to minimise the scrap may result in substantial savings not only in strip material, but also in overall production. This paper is maily trageted at establishing a practical blank layou optimisation system forstamping die by using AutoCAD's ObjiectARX toolkit. The basic principles of blank layout optimistaion are first descrbed. Not only a suitable algorithm for layout calculation, but also the manufacturing requirements an user operation are fully considered in this system. Finally, an algorithm for blank shape offsetting is proposed to solve the problem of selfintersection in offset curves, andd the traditional' I-step translation' algorithm for the caluction of layout parameters is improved to eliminatte the confilic between preecsion and efficiency in the layout optimisation.

Experiments dealing with the upsetting of sintered materials have resulted in the determination of a forming limit in terms of the local copressive and tenslis. As the specimen is comperessed, a plot of tensile strain versus compressive strain can be made. Fracture occurs when the strain parth intersects the forming limit. Once the fracture locus is defined by an experimental method, it is possible to use the Finite Element Method to determine if some upsetting operation will exhibit a free surface crack during a deformation process. In this study, a finite element program has been developed to analyze the deformation processes of sintered metals in upesetting. At the same time, products are inverstigated. The locus strains are then calualted and possible defects leading to material failure are checked. The calculated results argree well with the experimental results.

The extraction of knowledge from simulation results is becoming increasingly important, as numerical simulation is being widely used in the engineering design process. Knowledge extraction systems face challenging problems as the databases of simulation results tend to be dynamic, incomplete, redundant, sparse, and very large. This paper describes a novel approach for handling them. A consistent object-oriented data model for finite-element analysis results has been created usingEXPRESS-G, which has facilitated the construction of a database for the knowledge mining procedure. After briefly introducing Rough Sets Theory (RST) and principal component analysis (PCA), this paper investigates the capabilities andimplementation of both methods for extracting knowledge from simulation results. The methodology developed has been applied to a real application in sheet metal forming simulation and the results are presented.