Computational design of deformation processes for materials with ductile damage
نویسندگان
چکیده
A continuum sensitivity method is developed for thermoplasticity combined with ductile damage at finite strains. The computed sensitivity fields are used within a gradient-based optimization framework for the computational design of metal forming processes for porous materials. The accuracy and effectiveness of the developed updated Lagrangian finite element analysis and design techniques are demonstrated with a number of representative examples. In addition to die design problems, novel preform (shape) design problems are examined for near net shape manufacturing that accounts for the volume change induced during the deformation process. 2002 Elsevier Science B.V. All rights reserved.
منابع مشابه
FINITE ELEMENT PREDICTION OF DUCTILE FRACTURE IN AUTOMOTIVE PANEL FORMING: COMPARISON BETWEEN FLD AND LEMAITRE DAMAGE MODELS
In sheet metal forming processes with complex strain paths, a part is subjected to large plastic deformation. This severe plastic deformation leads to high plastic strain localization zones and subsequent accumulation of those strains. Then internal and superficial micro-defects and in other words ductile damage is created. This damage causes quality problems such as fracture. Therefore, design...
متن کاملEvaluation of Ductile Damage Criteria in Hot Forming Processes
The process of ductile fracture which occurs due to the accumulation, growth and combination of defects or cracks of material is called ductile damage. Failure in materials can be predicted, using damage mechanics and damage criteria. On the other hand, most of the materials depended to the manufacturing process, are formed in warm or hot conditions so that; the temperature also affects on the ...
متن کاملContinuum sensitivity method for the design of multi-stage metal forming processes
As part of this continuing DMI-funded NSF project, a novel, efficient and mathematically rigorous continuum based sensitivity method is being developed that can be used to accurately evaluate the gradients of the objective function and constraints in the design optimization of multi-stage deformation processes. The sensitivity methods developed allow for a unified treatment of both shape and pa...
متن کاملDamage Behavior in Modern Automotive High Strength Dual Phase Steels During Uniaxial Tensile Deformation
In the present research, damage mechanisms during room temperature uniaxial tensile testing of two different modern high strength dual phase steels,DP780 and DP980, were studied. Detailed microstructural characterization of the strained and sectioned samples was performed by scanning electron microscopy (SEM). The results revealed that interface decohesion, especially at the triple junctions of...
متن کاملContinuum models of ductile fracture : A review
The past 20 years have seen substantial work on the modeling of ductile damage and fracture. Several factors explain this interest. (i) There is a growing demand to provide tools which allow to increase the efficiency of structures (reduce weight, increase service temperature or load, etc.) while keeping or increasing safety. This goal is indeed first achieved by using better materials but also...
متن کامل