Non linear
Answers
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Hi Pratik,
Please recreate the Type 7 interface in the model. And also check the rigids in the model. The master node in RBE3 is a slave node of another RBE2 created, which is not possible. Please correct the same.
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Altair Forum User said:0
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Hi,
You can do post processing with the animation files (A001,A002....) or the final .h3d only. I have tried with the same (trail_7_0000.rad and trail_7_0001.rad) files which shared above and h3d was generated. Ensure the engine file (_0001.rad) is also available in the same working directory and try running again.
The basic control cards required for RADIOSS solver (run time, animation files, time history, results...) is as below:
<?xml version="1.0" encoding="UTF-8"?>
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Hi,
This s because of the loading you have applied. The load is applied is applied to the master node which will be equally distributed to all the slave nodes. In your case the loading effect is nullified. I just applied the load to the lower rigid body (master node of the rigid body in the third leaf) and the model is giving results.
Ensure the load is applied correctly at the required location so that results are created.
<?xml version="1.0" encoding="UTF-8"?>
The model file is also attached for your reference.
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Altair Forum User said:0
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Hi Pratik,
It is not necessary to provide engineering strain at UTS for /MAT/LAW2. You can run with Yield stress and UTS values.
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Altair Forum User said:
Hi Pratik,
It is not necessary to provide engineering strain at UTS for /MAT/LAW2. You can run with Yield stress and UTS values.
Ok George. Thank you. I want to try another way also. Will you give me idea of how to give input stress strain curve for steel material along with its Young's modulus,rho and poisson ratio ?
Regards,
Pratik
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Hi Pratik,
If you want to input stress strain curve for an elasto plastic material then use /MAT/LAW36 , where you can input E, Rho and stress-strain curve.
Please note that the stress strain curve should start from the yield point of your curve, that is post yield values should be provided. I recommend you to go through the Help Menu on /MAT/LAW/36 where you will get more information on the same.
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Altair Forum User said:
Hi Pratik,
If you want to input stress strain curve for an elasto plastic material then use /MAT/LAW36 , where you can input E, Rho and stress-strain curve.
Please note that the stress strain curve should start from the yield point of your curve, that is post yield values should be provided. I recommend you to go through the Help Menu on /MAT/LAW/36 where you will get more information on the same.
Ok George. Thank you for clearing all my doubts. Will consult you whenever I get stuck up in nonlinear analysis in Radioss.
Regards,
Pratik
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Altair Forum User said:
Hi Pratik,
If you want to input stress strain curve for an elasto plastic material then use /MAT/LAW36 , where you can input E, Rho and stress-strain curve.
Please note that the stress strain curve should start from the yield point of your curve, that is post yield values should be provided. I recommend you to go through the Help Menu on /MAT/LAW/36 where you will get more information on the same.
Hi George,
I need a help again. Whatever above result I got in leaf spring analysis using Radioss solver, it is not proper. Please check animation file. I have given material inputs properly still the leaf sliding motion is not correct. Moreover the master node of RBE2 of right eye of first leaf must move along with slave nodes, isn't it? Please check with animation files. Whatever load and material values given are proper. Please do some necessary correction and let me know where I am going wrong.
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Hi Pratik,
Please try with the file attached.
<?xml version="1.0" encoding="UTF-8"?>
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Hi Pratik,
Can you please share the Ansys model file,so that we can recheck with the model and can ensure the model setup is correct.
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Altair Forum User said:
Hi Pratik,
Can you please share the Ansys model file,so that we can recheck with the model and can ensure the model setup is correct.
Hi George,
Unfortunately I do not have ANSYS model file. I have only animation file that I have already shared with you. At right eye end of first leaf Shackle is connected. Thats why only X translational and Z axis rotational allowed. Rest all setup is correct. I guess may be helper is not pushing 2nd leaf. There might be some error in TYPE 7. Please check why why helper is not pushing upwards.
Regards,
Pratik
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Hi Pratik,
Is the loading correct, that is the force values?.
If you have the final animation file (not .avi video) please share the same.
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Altair Forum User said:0
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Hi Pratik,
Define a Type 2 interface between 3rd leaf and center pad 2 and similarly between center pad 2 and 2nd leaf and try running the analysis.
The model file is attached for your reference.
Please check the attached gif.
<?xml version="1.0" encoding="UTF-8"?>
<?xml version="1.0" encoding="UTF-8"?>
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Altair Forum User said:0
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Thank you so much George.
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Altair Forum User said:0
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Hi,
Please share the out files (_0000.out and _0001.out) and also the engine file.
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Altair Forum User said:
Hi,
Please share the out files (_0000.out and _0001.out) and also the engine file.
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Hi,
As the time step drops the run time will increase.
From the engine out files check what is causing this issue. It could be an element, or node or interface.
<?xml version="1.0" encoding="UTF-8"?>
For an element, check the related material.There must not be an error in the units system that this data is given in. check the element size also.
For a node, check the characteristics of connected elements. If the node is on the master side or the slave side of an interface, this interface must be verified.
For an interface, the gap of the interface must be verified if some failure happens on the master or the slave side of the interface. Also check the interface for any penetrations.
You can try imposing a time step for the model (/DT/NODA/CST). Please refer tthis video for timestep in RADIOSS Explicit: https://altair-2.wistia.com/medias/o0bfml9ah5
As a guideline, in order to achieve this behavior I had to provide a large run time in RADIOSS. Normally for explicit analysis we run it for milliseconds only but your case goes to seconds. And so the total run time will be very high. I strongly recommend you to try the same in OptiStruct, NLSTAT with LGDISP. We have tutorials on this in Help Menu.
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Altair Forum User said:0
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Hi Pratik,
As I told in the last reply this is typically not an explicit case. In order to achieve a similar kind of simulation which you have shared we need to run the simulation for more time and that results in this high run time.And moreover the timestep is also less in your model.
The only possibility is to try with OptiStruct, where you can use NLSTAT with LGDISP..
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Hi Pratik,
It is not possible to minimize the run time for this model. I have also ran for a long time for those results.
You can solve this with implicit solver, and please use OptiStruct, where you can use NLSTAT with LGDISP to solve the same.
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Altair Employee
