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priyadd84's blog

Good substitute for cowper-symonds in Abaqus

Submitted by priyadd84 on
Hi all,
        I want to capture strain-rate behaviour of materials but unfortunately abaqus does not have Cowper-Symonds which is a widely used (simple) model. However johnson-cook is to complicate for me as not much details are available in literature as i am modeling bio-materials. Is there any good substitute for Cowper-Symonds models in abaqus. Thanks.

Material Parameter Calibration for Johnson Cook

Submitted by priyadd84 on

Hi all ... Is there a way to find/calibrate material parameters for johnson and cook material model using experimental data in Abaqus? .. As far as i know abaqus has something called as data editor with which Hyperelastic materials models can be calibrated with experimental results. If not is there any other way arround to do calibration of material parameter with abaqus.

Charpy Vs Gardner test

Submitted by priyadd84 on

Hi ... what is the difference in functionality between charpy (a simply supported specimen(notched/unnotched) is hit by a swinging pendulum)and gardner test (a simply supported specimen(notched/unnotched) is hit by a vertical free falling mass guided by rails) .... 

1.What is the loading pattern in the point of contact between the specimen and the setup?

2.Why fracture pattern varies between the two test setups for similar specimen with same impact velocity, Which parameter is responsible for the variation in fracture type.  

Hydrostatic pressure stress element removal criterion in Abaqus.

Submitted by priyadd84 on

Hi all,

         Recently  i tried  Hydrostatic pressure stress element removal criterion in Abaqus(19.2.8 Dynamic failure models in the 6.9 manual) . I used 75 Mpa as cut-off pressure stress and after which the material fails. During post - processing i tried to measure the pressure stress in an element that failed but the element did not fail at 75 Mpa and i checked few other elements, also i found the same thing none of them failed at 75 Mpa. What could be the possible reason? 

Thanks

Mike 

Need a hand to pull me into the world of XFEM !!

Submitted by priyadd84 on

Dear all,

         I am new to X-FEM, started reading papers a couple of weeks before. I understood, functions[heaviside,sign..] are used to enrich the nodes to simulate virtually the discontinuity and asymptotic functions are used to charecterize the crack tip,other than this regular FEM nodes are there. I have few questions.