EXPDYN ERRORs
Hi，How to solve this kind of error？
*** ERROR # 4002 ***
Running RADIOSS engine, 1 ERROR and 0 WARNINGs have been detected.
They are listed below.
ENGINE ERROR:
** RUN KILLED : ENERGY ERROR LIMIT REACHED
Answers
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Altair Forum User said:
Hi,Why are there so many errors in the .0001 file? However, no errors were indicated when submitting the calculation. Why is that? How to properly set up contact to avoid this kind of error?
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Hi @Amasker
This is because of B2B conversion. RADIOSS is used as the solver in the backgroud and the errors are written to 001. out instead.
I can see the majority of errors are due to TYPE2 interface. Master nodes are also used in slave nodes. Can you please check the same?
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Ask a question about the definition of elastoplastic material, apply a static load in the middle of the B-pillar, material type MATS1, but the .out file suggests that the elastoplastic material setting is invalid. As follow：
*** INFORMATION # 1579
for material id = 2 referenced from property id = 2.
MATS1 referred to from MID3 will be ignored - plasticity is
supported for membrane and bending deformation, but not for transverse shear.I don't know why？can you give some advices? thank you.
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Altair Forum User said:
Ask a question about the definition of elastoplastic material, apply a static load in the middle of the B-pillar, material type MATS1, but the .out file suggests that the elastoplastic material setting is invalid. As follow：
*** INFORMATION # 1579
for material id = 2 referenced from property id = 2.
MATS1 referred to from MID3 will be ignored - plasticity is
supported for membrane and bending deformation, but not for transverse shear.I don't know why？can you give some advices? thank you.
Instead of MATS1 use MATX2 or material cards within MAT1 card to define plasticity for EXPDYN analysis type.
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Altair Forum User said:
Instead of MATS1 use MATX2 or material cards within MAT1 card to define plasticity for EXPDYN analysis type.
But, I applied the static load in the model, the loadstep is not explicit dynamic.
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Plasticity describes non-linear material behaviour (stress-strain curve is non-linear) where the material deforms permanently. This type of problem can not be solved in linear static analysis.
Radioss explicit solver should be used for crashworthiness, beacause it is a dynamic event with material, contact and geometric non-linearity.
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Altair Forum User said:
You can use NLSTAT analysis type to run the analysis with material non-linearity
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Altair Forum User said:
Plasticity describes non-linear material behaviour (stress-strain curve is non-linear) where the material deforms permanently. This type of problem can not be solved in linear static analysis.
I am sorry I didn't express it clearly ，how to define plasticity under constant static load？
I tried NLSTAT analysis step，but it seems doesn't work
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Altair Forum User said:
You can use NLSTAT analysis type to run the analysis with material non-linearity
I tried NLSTAT analysis step，but it seems doesn't work
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Altair Forum User said:
I am sorry I didn't express it clearly ，how to define plasticity under constant static load？
As suggested by @Prakash Pagadala, use NLSTAT (quasi static simulation).
you have excessive deformation in you analysis, so Loads and BCs are not appropriate
*** WARNING # 3200
Maximum plastic strain in this solution: 1.102 exceeds the limit of small
deformation theory. The validity of this solution is questionable.
*** WARNING # 5628
The compliance is negative or large 7.97867e+008.
The rotational displacement has large magnitude, 191.979 degrees (larger than 180).
The rotational degree of freedom may not be constrained properly in the model.
*** WARNING # 312
In static load case 1
the compliance is negative or large 7.97867e+008.
Optimization/buckling analysis cannot be performed.
due to possible rigid body mode.To get accurate loads and boundary conditions full scale crash simulations should be performed first and then loads extracted using Equivalent Static Load Method.
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Altair Forum User said:
I can see plastic strain from your .out file which means MATS1 is taken care during the simulation.
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Altair Forum User said:
To get accurate loads and boundary conditions full scale crash simulations should be performed first and then loads extracted using Equivalent Static Load Method.
Ivan,
I will try again.
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Altair Forum User said:
I can see plastic strain from your .out file which means MATS1 is taken care during the simulation.
*** INFORMATION # 1579
for material id = 2 referenced from property id = 2.
MATS1 referred to from MID3 will be ignored - plasticity is
supported for membrane and bending deformation, but not for transverse shear.What does this information mean？MATS1 doesn't work？
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Altair Forum User said:
*** INFORMATION # 1579
for material id = 2 referenced from property id = 2.
MATS1 referred to from MID3 will be ignored - plasticity is
supported for membrane and bending deformation, but not for transverse shear.What does this information mean？MATS1 doesn't work？
It doesn't mean that plasticity is completely ignored. Plasticity is supported for membrane and bending deformation but IGNORED for transverse shear as the effect of transverse shear on plasticity is not significant. This can be neglected.
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Altair Forum User said:
It doesn't mean that plasticity is completely ignored. Plasticity is supported for membrane and bending deformation but IGNORED for transverse shear as the effect of transverse shear on plasticity is not significant. This can be neglected.
Thank you ，I get it.
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I am sorry trouble you all the time，I have another question，puzzled for some time，error as followes
ERROR ID : 556
** ERROR IN INTERFACE TYPE2
DESCRIPTION :
-- INTERFACE ID : 3
-- INTERFACE TITLE : INTER_TYPE2_3
MASTER NODE ID=2115444 IS ALSO SLAVE NODE OF ANOTHER INTERFACE TYPE2I figured out where is wrong，but I can't solve it
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You can exclude master nodes which are also part of the slave nodes.
or
Set spotflag to 25 and try again
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Altair Employee