The machine info is as 44 Hz breaking frequency, 900 kg of Pressure Per Strike and Raises 20 mm Per Strike
Hi
Can you explain more about your model? You can use the impact loading but the bottom line is that you need to have some specified criteria like velocity, time, the direction of breaker machine and so on.
If you want to predict the damage, the method can be different based on the tested material (concrete, steel, pavement, etc). Please explain more about your materials and model. Then, I will be able to help more.
Thanks
Thanks for yor response. Its a resonant breaker machine on top of 9in of concrete, rubblizing it, then 2.5” of open graded drainage layer, 6” of cement treated aggregate base. My goal is to verrify this rubblization will not damage the base layer. The breaker machine has frequency of 44hz with soecific load and drop height
Thanks for make it more clear.
As for as I got your question, you need to use impact loading. Impact loading as you probably know is in the term of Dynamic Explicit modeling. You need to define and model a solid element as your load cell and assign specific height from the top of concrete surface, you can adjust the height of drop in assembly module by fixing surface to surface. there are some other factors in your research;
you have two different layers with different materials. Granted, you can consider them as a Macro model but in order to be more accurate in your result you have to carefully define the material properties and interaction between them. Moreover, you may have the de-bonding problem in your model, too.
On the other hand, in order to find out the level to not damage the base, you need to have some experimental results to check the maximum displacement, velocity and load which I think you have them.
You also need to define an amplitude ( you can use the Tabular but if you also can use smooth step and PSD definition which gives you an opportunity to define the gravity and frequency , simultaneously.
To wrap up, define dynamic analysis, define the velocity ( in load module ), define an amplitude, define an appropriate material properties.
And in order to find out the way that your base does not damage, you need to assign an appropriate displacement according your either numerical or experimental results.
Hope it can be useful.
if you have any question please feel free to let me know.
Regards
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