Method for quickly obtaining corrected DPC constitutive model parameters for pressing forming of metal powder
A metal powder, press-forming technology, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as difficulty and cumbersome constitutive parameter determination
Pending Publication Date: 2018-10-09
CIVIL AVIATION UNIV OF CHINA
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[0006] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a method for quickly obtaining the parameters of the DPC constitutive model of the modified metal powder compaction, for the generalized plastic mechanics constitutive model, that is, to correct the Drucker-Prager Cap, DPC model, through MATLAB- ABAQUS co-simulation, using complex shape optimization algorithm for parameter inversion, quickly find accurate constitutive model parameters, solve the problem of tedious and difficult determination of constitutive parameters in the process of pressing and forming of different metal powders, and realize rapid simulation prediction of pressing and forming analyze
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[0049] The present invention will be further described in detail below through the specific examples, the following examples are only descriptive, not restrictive, and cannot limit the protection scope of the present invention with this.
[0050] A kind of inversion optimization calculation method of the present invention quickly obtains the parameters of the DPC constitutive model of repairing metal powder compaction, and its steps are as follows:
[0051] 1) Determine the inversion optimization objective function based on the revised Drucker-Prager Cap model:
[0052] Using a modified Drucker-Prager Cap model, such as figure 1 As shown, it is a density-dependent model used to describe the mechanical behavior of metal powders. Its yield surface consists of three sections: a shear failure surface, a hat surface, and a transition surface. In order to determine the yield surface, six parameters need to be determined, β, d, p a ,R,p b and α, except α is a constant (take 0.03),...
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The invention discloses a method for quickly obtaining corrected DPC constitutive model parameters for pressing forming of metal powder. The method comprises the steps of 1, determining an inverse optimized objective function based on a corrected Drucker-Prager Cap model; 2, inputting a tested metal powder pressing experiment pressing force curve and inverse optimized parameter initial values; 3,judging whether or not (k-1) random points obtained through the formula 1-4 are in a feasible region, and if not, managing to move non-feasible points into the feasible region; 4, constructing a finite element model the same as that of the experiment in Abaqus; 5, using a MATLAB to call ABAQUS for finite element calculation; 6, outputting pressing force obtained through simulation, and calculatingan objective function; 7, conducting optimizing processing. By means of the method, aiming at the corrected Drucker-Prager Cap (DPC) model, through MATLAB-ABAQUS joint simulation, parameter inversionis conducted through a compound shape adjusting and optimizing algorithm, the accurate constitutive model parameters are quickly found out, the problem that it is tedious and tough to determine the constitutive parameters in the pressing forming processes of different kinds of metal powder can be solved, and quick simulation, prediction and analysis of pressing forming are achieved.
Description
technical field [0001] The invention belongs to the field of constitutive model research of metal powder pressing and forming, and in particular relates to an inversion optimization calculation method for quickly obtaining parameters of a metal powder pressing and forming DPC constitutive model, which is suitable for modern powder metallurgy manufacturing. Background technique [0002] Powder metallurgy technology has become the preferred preparation technology for key parts of aero-engines and automobiles, and with the increasing demand for high-precision and complex-shaped powder metallurgy parts, traditional production methods can no longer meet the requirements, and numerical simulation technology is integrated into metal Forming theory is the best method to study the forming process at present. [0003] Computer simulation technology has become an effective method for powder metallurgy industry to reduce product cost, improve product quality, and shorten product develop...
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IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 周蕊李璐璐刘兵飞杜春志李敏
Owner CIVIL AVIATION UNIV OF CHINA