COMPARABLE 7 DIFFERENT CASE WITH DIFFERENT PARAMETRS IN DIFFERENT MATERIALS PROPERTY

• Aim
  • • COMPARABLE 7 DIFFERENT CASE WITH DIFFERENT PARAMETRS IN DIFFERENT MATERIALS PROPERTY

• G DRIVE LINK:https://drive.google.com/drive/folders/198kjB6RImn3hSb164YO3ucfBh7fTSoqY

• CASE-1
  • • LAW-2 EPSMAX-FAILURE
• CASE-2
  • • CHANGING THE VALUE IFAIL SH=1,DADV=1 AND IXFEM=1
• CASE-3
  • • DELETE THE FAILURE J-C-MATERIAL CARD
• CASE-4
  • • DELETE THE EPS MAX
• CASE-5
  • • CONVERT THE LAW -1MATERIAL
• CASE -6
  • • CONVERT PLAST BRIT MATERIAL
• CASE-7
  • • CREATE ELASTIC PLASTIC TABULATED MATERIAL

CASE-1(LAW 2 EPSMAX FAILURE)

• • • • • EPS MAX= PLASTIC STRAIN AT FAILURE TENSION, COMPRESSION OR SHEAR
        • IT REPRESENTS WHERE MY MODEL GET FAILURE AT PLASTIC REGION AFTER THE YEILDPOINT.
        • THE LAW 2 REPRESENTS THE MATERIAL HAS PLAS_JOHN SON COOK
• JHON SON COOK IS MAINLY USED FOR DETERMINETHE STRESS VALUE
  
  • • This law represents an isotropic elasto-plastic material using the Johnson-Cook material model. This model expresses material stress as a function of strain, strain rate and temperature.A built-in failure criterion based on the maximum plastic strain is available.

CASE STEP IMAGE

OUT FILE RAD 000

THE ENERGY ERROR IS 0.2 UPTO 15% IS ACCPETABLE AND THE MASS ERROR IS 0 SO, WE READY TO RUN THE SIMULATION

• • • CASE-2(CHANGING THE VALUE IFAIL SH=1,DADV=1&IXFEM=1)

• • • • IFAIL SH=Shell failure flag

        (Integer)

        If Ixfem =0: failure - element deleted

        If Ixfem =1: failure - element cracked 2

        = 1: (Default) Shell is deleted or cracked when D=∑Δεpεf≥1\">D=∑Δεpεf≥1D=∑Δεpεf≥1 for one integration point or layer.

        = 2: For each integration point, the stress tensor is set to zero when D=∑Δεpεf≥1\">D=∑Δεpεf≥1D=∑Δεpεf≥1 . The shell is deleted or cracked when D=∑Δεpεf≥1\">D=∑Δεpεf≥1D=∑Δεpεf≥1 for all integration points or layers.

      • DADV=Criterion for the crack advancement (Only active if with Ixfem =1) 4

(Real between 0 and 1)

= 1: (Default)

• • • • If D_adv > 1, then D_adv = 1 (max accumulation damage value D, used for crack initiation)

• OUT FILE RAD
  • • • THE ENERGY ERROR IS 4.0 % UPTO 15% IS ACCPETABLE AND THE MASS ERROR IS 0 SO, WE READY TO RUN THE SIMULATION

• COMPARING CASE-1 vs CASE-2
  • • • • • • • IN CASE 1 THE ELEMENTS ARE DELETED WITH OUT CRACKING BUT CASE 2 ELEMENT FIREST CRACK AFTER DELETED
              • IT OCCUR DUE TO THE CHANGING THE FAILURE CARD PARAMTER.

• OTHER IMAGE
  
  • • • • • • • THE MAX THICKNESS REDUCTION IS 7.392 IN CASE 1 BUT CASE 2 IS 9.908 MM
              • THE MAX STRAIN IS 0.140 IN CASE 1 BUT CASE 2 IS 0.142
• GRAPH COMPARISON
  • • • • • • • IN THEIMAGE SHOW INTERNAL ENERGY INCREASE ACCROGIGLY TIME
              • IN THIS IMAGE SHOW BOTH CASE THE HOUR GLASS REMAINS 0 IT,S DUE TO THE IMPROVE THE SHELL QUALITY

• CASE 3(DELETE FAILURE J-C MATERIAL CARD)
  

• • • • • • • • IN CASE 3 WE DELETE THE FAILURE CARD AND GIVE THE VALUE EPS MAX IS 0.15
              • EPS MAX= PLASTIC STRAIN AT FAILURE TENSION, COMPRESSION OR SHEAR
              • IT REPRESENTS WHERE MY MODEL GET FAILURE AT PLASTIC REGION AFTER THE YEILDPOINT SO , AFTER 15% OF YEILS POINT MY MODEL GOES TO PLASTIC REGION.

• CASE STEP IMAGE

• OUT PUT RAD FILE
  • • • • • • • THE O/P FILE SHOWS GOOD RESULT TO MOVE FUTHER SIMULATION

• CASE-4(DELETE OR SET DEFAULT VALUE THE EPS MAX VALUE)

• • • • • • • • Strain rate is the change in strain (deformation) of a material with respect to time. The strain rate at some point within the material measures the rate at which the distances of adjacent parcels of the material change with time in the neighborhood of that point.

• OUT PUT FILE
  • • • • • • • THE O/P FILE SHOWS GOOD RESULT TO MOVE FUTHER SIMULATION

• CASE 3& 4 COMPARSION IMAGE
  
  • • • • • • • IN CASE 3 THE EPS MAX IS .15 SO,THE ELEMENTS GET DELETED BUT OTHER HAND C-4 EPS MAX IS 0 SO THE ELEMENTS ARE NOT GET DELETED.

• OTHER IMAGE
  • PLASTIC STRAIN ALONG THICKNESS C3 VS C4
    • • • • • • THE MAX PLASTIC STRAIN IS C3=149.43E-3 BUT C4=0.291

• INTERNAL ENERGY OF C3 VS C4
  • • • • • • • IN THIS IMAGE SHOW AFTER DELETING THE ELEMENTS FROM C 3THE IE ARE CONSTANT BUT OTHER HAND C4 THE IE FUTHER INCREASE

• HOUR GLASS C3 VS C4
  • • • • • • IN BOTH CASE THE HOUR GLASS ARE REMAIN CONSTANT DUE TO THE IMPROVED SHELL ELEMENTS

• CASE-5(LAW 1 MATERIAL PROPERTY)
  • • • • • • • • IN LAW -1 IS ISOTROPIC ELASTIC MATERIAL INORDER TO DEFINE THE MATERIAL WE NEED DENSITY, YOUNG MODULUS, POSSION\'S RATIO
                • IN OUR CASE RHO=0.0028,E=71000&NU=0.33 AND LAW-1 IS ELASTIC MATERIALS

• OUTFILE RAD

• CASE-6(M 27_PLASTIC_BRITTLE_MATERIAL)
  • • • • • • • • This law combines an isotropic elasto-plastic Johnson-Cook material model with an orthotropic brittle failure model. Material damage is accounted for prior to failure. Failure and damage occur only in tension. This law is applicable only for shells.
                • In this model, the material behaves as a linear-elastic material when the equivalent stress is lower than the plastic yield stress. For higher stress values, the material behavior is plastic and the stress is calculated as.(1)
                  σ=(a+bεpn)(1+clnε˙ε˙0)\">σ=(a+bεpn)(1+cln˙ε˙ε0)σ=(a+bεpn)(1+clnε˙ε˙0)

                  Where, εp\">εpεp is the plastic strain and ε˙\">˙εε˙ is the strain rate.

                  The plasticity hardening exponent, n must be less than 1.

                • This law allows the modeling of material damage and brittle failure in two principal directions (1 and 2).
                • This law is only applicable to shell elements. It is compatible with Shell Property (/PROP/TYPE1) and Sandwich Shell Property (/PROP/TYPE11).

• CASE SETUP IMAGE

• OUT RAD FILE

• CASE 5& 6 COMPARSION IMAGE

• • • • • • • • • THE ABOVE IMAGE CLEAR SHOWES C-5 ELASTIC MATERIAL WHICH UNDERGOES LARGE DEFORMATION BUT IN C-6 THE MATERIAL BRITTLE LIKE GLASS
                • IN AUTOMOBILE C-5 MATERIAL IS NOT WIDEDLY USED FOR CRESH ANALYSIS
• OTHER IMAGE
  • • • • • • • • IN THE ABOVE PICTURE SHOWS IE IN C-5 GRADUALLY INCREASE WITH RESPECT TO TIME BUT C-6 AFTER SOME TIME THE IE REAMINS CONSTANT

• VON MISES IN C-5&C-6
  • • • • • • • • THE MAX VALUE IS 10857.090 IN C-5 BUT THE VALUE IN C-6 IS 277.125 DUE TO THE LAW -27

• HOUR GLASS AND CONTACT ENERGY IN C-5&C-6
  • • • • • • • • IN BOTH CASE THE HG AND CONTACT ENERGY IS CONSTANT DUE TO IMPROVED SHELL PROPERTY

• CASE-7(ELASTO PLASTIC TABULATED MATERIALS)
  • • • • • • • • This law models an isotropic elasto-plastic material using user-defined functions for the work-hardening portion of the stress-strain curve (for example, stress vs. plastic strain) for different strain rates.
                • EPS_T =PALSTIC FAILURE STRAIN FOR TENSION OR COMPRESSION SHEAR
                • EPS_M = WHEN TENSILE PLASTIC STRAIN MATERIALS IS 0.11 STRESS IN ELEMENTS BECOME ZERO

• CASE STEP IMAGE

• OTHER IMAGE

GRAPH IMAGE

• COMPARABLE 7 DIFFERENT CASE WITH DIFFERENT PARAMETRS IN DIFFERENT MATERIALS PROPERTY

• RESULT
  • • • SELECTING THE CORRECT MATERIAL PLAY IMPORTANT ROLE FOR ANASLYS

• LAW-1(ELASTIC)
  • • • • DEFINES AN ISOTROPIC, LINEAR ELASTIC MATERIAL USING HOOKE\'S LAW. THIS LAW REPRESENTS A LINEAR RELATIONSHIP BETWEEN STRESS AND STRAIN
        • TO DFINE THIS MATERIALS WE NEED BASIC PARAMETER LIKE RHO,E,NUO
        • IT ONLY SUITABLE ELASTIC MATERIALS

• LAW-2(ELASTIC PLASTIC )
  • • • • In this model the material behaves as a linear-elastic material when the equivalent stress is lower than the plastic yield stress. For higher stress values, the material behavior is plastic and the stress is calculated
          σ=(a+bεpn)(1+clnε˙ε˙0)(1−(T∗)m)\">σ=(a+bεpn)(1+cln˙ε˙ε0)(1−(T∗)m)
        • UP TO TH EYILD POINT IT ACT ELASTIC BEYOND THE YEILD POINT IT AN PLASTIC (FOR HIGHER STRESS VALUE)

• LAW-27(BRITTLE MAT)