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VM_YF.h

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00001 
00002 //   COPYLEFT (C): Woody's viral GPL-like license (by BJ):
00003 //                 ``This    source  code is Copyrighted in
00004 //                 U.S.,  for  an  indefinite  period,  and anybody
00005 //                 caught  using it without our permission, will be
00006 //                 mighty good friends of ourn, cause we don't give
00007 //                 a  darn.  Hack it. Compile it. Debug it. Run it.
00008 //                 Yodel  it.  Enjoy it. We wrote it, that's all we
00009 //                 wanted to do.''
00010 //
00011 //
00012 // COPYRIGHT (C):     :-))
00013 // PROJECT:           Object Oriented Finite Element Program
00014 // FILE:              
00015 // CLASS:             
00016 // MEMBER FUNCTIONS:
00017 //
00018 // MEMBER VARIABLES
00019 //
00020 // PURPOSE:           
00021 //
00022 // RETURN:
00023 // VERSION:
00024 // LANGUAGE:          C++
00025 // TARGET OS:         
00026 // DESIGNER:          Zhao Cheng, Boris Jeremic
00027 // PROGRAMMER:        Zhao Cheng, 
00028 // DATE:              Fall 2005
00029 // UPDATE HISTORY:    
00030 //
00032 //
00033 #ifndef VM_YF_H
00034 #define VM_YF_H
00035 
00036 #include "YieldFunction.h"
00037 #include <math.h>
00038 
00039 class VM_YF : public YieldFunction
00040 {
00041   public:
00042   
00043     VM_YF(int k_which_in = -1, int index_k_in = 0, 
00044           int alpha_which_in = -1, int index_alpha_in = 0);
00045     ~VM_YF();
00046       
00047     YieldFunction *newObj();
00048   
00049     double YieldFunctionValue(const stresstensor &Stre, 
00050                               const MaterialParameter &MaterialParameter_in) const;
00051     
00052     const stresstensor& StressDerivative(const stresstensor &Stre, 
00053                                          const MaterialParameter &MaterialParameter_in) const;
00054     
00055     double InScalarDerivative(const stresstensor &Stre, 
00056                               const MaterialParameter &MaterialParameter_in, 
00057                               int which) const;
00058                            
00059     const stresstensor& InTensorDerivative(const stresstensor &Stre, 
00060                                            const MaterialParameter &MaterialParameter_in, 
00061                                            int which) const;
00062     
00063     int getNumInternalScalar() const;
00064     int getNumInternalTensor() const;
00065     int getYieldFunctionRank() const;
00066 
00067   private:
00068   
00069     double getk(const MaterialParameter &MaterialParameter_in) const;
00070     
00071     const stresstensor& getbackstress(const MaterialParameter &MaterialParameter_in) const;
00072     
00073   private:
00074       
00075     int k_which;
00076     int index_k;
00077     int alpha_which;
00078     int index_alpha;
00079         
00080     static stresstensor VMst;
00081 };
00082 
00083 
00084 #endif
00085

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