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# Durability analysis on pre-constrained model

N/A

Hello,
I would like to medel the behaviour of a turbio diesel injector clam.
The clamp is like a 2 fingered fork, at he heel it rests on the cylinderhead,
at the fingers it holds the injector, and it is bolted at the middle into the cylinderhead.
Basically it is a 3 points bending problem.
I have a 31kN force coming from the bolt statically.
I would like to model the durability of this when the engine is running, from the
combustion chamber I will have about 500N coming upwards at each compression at
the injector/clamp contact area.
Is there a way to import the results of the static analysis (at 31kN), then add
dinamically the 500N? Or do I have to use a time-dependent load variation with an
offset of Clamp-reaction-force-at-injector and amplitude of 500N (Pi periodic)?

Thanks a lot for any help.
regards,
Tamas

# Re: Durability analysis on pre-constrained model

N/A

Hello Tamas,
If you plan to use SOL 112 or 109, you would want to create two loads for your transient
define each with a TLOAD that points to a table that gives the time history of the
so you don't get a large initial transient from an instant application of a large
force. The periodic loading I would also start from the zero position. You will
want to run for several periods to get any transient effects to die out.
Alternatively to the ramp-up you may want to try the new transient initial conditions
that points to a static subcase IC(STATSUB) = n. The static subcase would be your
subcase, but you would not have to ramp it up.
Remember for SOL 112, you probably want to use residual vectors.
Mark

"Tamas" wrote:
>
>Hello,
>
>I would like to medel the behaviour of a turbio diesel injector clam.
>
>The clamp is like a 2 fingered fork, at he heel it rests on the cylinderhead,
>at the fingers it holds the injector, and it is bolted at the middle into
>
>Basically it is a 3 points bending problem.
>
>I have a 31kN force coming from the bolt statically.
>
>I would like to model the durability of this when the engine is running, from
>the
>combustion chamber I will have about 500N coming upwards at each compression
>at
>the injector/clamp contact area.
>
>Is there a way to import the results of the static analysis (at 31kN), then