Failure mechanism of material cards under Impact loading

AIM:
To simulate, compare and interpret the cases of a given model

PROCEDURE:
Open the given model FAILURE_JOHNSON_0000 from the existing location
Run the simulation and plot the graph corresponding to the case
The default model sums-up with properties as given below



CASE 1

• Run the model as it is, without any changes on the parameter
• The default model provided here is LAW_02 `i.e.,` Isotropic elastoplastic at Johnson-cook material
• At the initial stage, the material got deleted because of failure card properties Ixfem=0

CASE 2

• By changing the Failure card properties as Ifail_sh=1, Dadv=1, and Ixfem=1
• The material got cracked and reaches the crack criteria

CASE 3

• By deleting the Failure card, the element got deleted at the initial stage so as in case 1
• The Ixfem value gets zero similarly case 1 output is concluded

CASE 4

• By deleting or removing the value on EPS_p_max the element get delete
• As in this case, the EPS_p_max value has removed the stress exceeds the maximum value

CASE 5

• By converting the material card into LAW_01 `i.e.,` Isotropic elastic
• The material undergoes slight tear but element goes no failure
• The hypergraph determines the regional flow

CASE 6

• Open the model LAW27_0000 from existence
• The given material card is Elasto-plastic with Brittle failure
• The kinetic energy is abrupted at the final stage because of brittle failure of the model

CASE 7

Open default file from an existing location
Create a Curve> New> plot Stress & strain values > Update
Change the material card to LAW_36 `i.e.,` Tabulated piecewise linear
Change the properties with respected values before, to run the simulation select the curve from fct_ID

• An elemental get deleted because of Ixfem = 0
• The failure criteria value depends on the parameters D1, D2, D3
• Because of the plasticity, the energy got abrupt at the final stage of Hypergraph

The following cases are determined and tabulated on basis of the number of cycle, error, and time

CONCLUSION:
From the above cases,
The failure happened by EPS_p_max, sigma_max, failure card
The value which attends first order undergo material failure on the element