hii all..

i am working on fracture mechanics. i had modeled a 4 pt bend specimen having single notch crack(in ABAQUS). i am trying to find the range of K-dominant region at the crack tip.i had modelled radial mesh at the crack tip and using 20 noded reduced integration elements. To analyze the K-dominat region, primarily i had compared the theoritical stress plots and computational stress plots. stress plots means Sxx Syy Sxy values plotted againt the angle(angle measured from uncracked segment) at particular radius.

 i request your suggestions, relevent papers and comments.

thanks

best wishes

ravitej

Hi all

How can i get the coordinate data of integration points of a 20 noded brick element(reduced integartion)?

thanks you

ravitej 

Hii All

i am using 20 noded brick elements with reduced integration to analyse stress and displcement fields in a simply supported beam. how can i control hourglassing effect? please give me suggestions. 

Hi everyone

can anyone tell me how to use "display group" option in ABAQUS.

i have to find the total reaction force of set of all nodes on a particular surface. i had tried many times using "display group" option. but couldnt succeded.

or is there any other option to get the data from those set of nodes on a surface.  we have this kind of option in ANSYS, but what will the corresponding feature in ABAQUS.

Please help me in this regard. 

cheers

Ravitej 

hi,

i want the mid point deflection in case of "four point bend test" on a specimen of length 140mm, width of 40mm and thickness of 10mm.

Problem is that, beam theory is valid if the cross-sectional dimensions are less than axial dimensions. Here this condition is violated. i had modeled the specimen in Abaqus and the diffection at mid point is almost double that of the actual diffection calculated from beam theory. 

how can i find the theoritical difflection at mid point in this case?

i had one option, using timoshenko beam theory and applying larger deflection theory. will it be a reasonable approximation in this case?

 Ravitej

hello every one,

      i am Ravitej, doing my Mtech at IIT kanpur, India. Now, i am working  on FGM( funtionally Graded Materails). Can i model the FGM as a layered specimen with the youngs modulus varying according to layers. is there any special elements in abaqus, so that we can assign property variation along the thickness. 

Problem that i had faced with the layerd model is

1) stress is not continous at the interface of layers, then how can we believe that the solution obtained is correct

2) what could be the youngs modulus at the interface, will it be average of two adjacent layers 

please guide me in this aspect to model the FGM correctly..