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Ayyappadas

Fatigue Analysis of Diesel Engine Piston

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Want to do fatigue analysis of diesel engine piston as the part of master's thesis.


 


 


Initially I have tried out a 2D fatigue analysis problem of a mild steel strip and got the results.


 


Then tried to do the fatigue analysis of piston using the same material and same method.


I got good VMS and displacement values for the static sub-case and the pictures are attached.


 


 


post-4480-0-17893600-1374573108_thumb.jp


 


 


But for the fatigue sub-case didnt give the necessary results.


 


 


post-4480-0-19233200-1374573128_thumb.jp


and


post-4480-0-14131000-1374573214_thumb.jp


 


I have followed the same method of 2D problem,PSOLID element is used for the analysis of piston.


(higher order tetrahedron element-10noded element)


Hope the wrong result is caused due to the lack of adjustments in converting a


2D problem to a 3D problem,like the changes needed for defining CARDS etc.


 


Varying pressure with respect to crank angle,for 100 cycles is applied for this fatigue analysis of Piston.


Please Help...


 


Ayyappadas


 


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