How to measure strains versus time responses for SPH analysis bird striking on plate

sachin awasare

Dear Forum Members,

I am currently validating a research paper that involves simulating a bird strike on an aluminium plate using Smoothed Particle Hydrodynamics (SPH). I have successfully produced results in terms of displacement, which align well with the experimental measurements at point D1, as shown in the figure below. However, I am facing challenges in obtaining accurate strain versus time data at points S1, S2, and S3, as reported in the referenced paper.

I have measured strain at these specified points, but the results exhibit significant variations compared to the paper's findings. I am reaching out to the forum for guidance on correctly extracting the strain history from my simulation results. I have attached the RAD file for your reference.

Any insights, suggestions, or recommendations on the correct approach for extracting strain data in SPH simulations would be greatly appreciated.

Thank you in advance for your assistance.

Regards ,

Sachin 

 

Adriano_Koga

a quick observation here. The paper shows probably total strain, as you can notice the strain reduces over time.

you're plotting plastic strains.

You should request the tensor of strains for the elements, and also make sure that you're plotting the top or bottom layer.

sachin awasare

Dear Adriano A. Koga,

Thank you very much for your reply.

I have added a tensor of strain card which is shown as follows.

 

Also requested plotting for the top layer as follows 

But results are not in order

kindly suggest any correction.

Regards ,

Sachin 

Adriano_Koga

sachin awasare said:

Dear Adriano A. Koga,

Thank you very much for your reply.

I have added a tensor of strain card which is shown as follows.

 

Also requested plotting for the top layer as follows 

But results are not in order

kindly suggest any correction.

Regards ,

Sachin 

correlation is not so simple, but as a remark the paper shows probably principal strains and not vonMises, as you're plotting. The paper results shows negative strain values, which would not happen plotting vonMises.

 

Anyway, the red curve seems to be very high. The others are showing strains around 5000~10000microstrains, which is not so far from the paper, apparently.

Could you share the reference paper?

sachin awasare

Dear Adriano A. Koga ,

I will check once again  as per your suggestion meanwhile please find attached paper for your reference .

 

regards,

 

Sachin