{"id":305666,"date":"2023-09-09T20:33:27","date_gmt":"2023-09-09T20:33:27","guid":{"rendered":"\/forum\/forums\/topic\/rock-drilling\/"},"modified":"2023-09-09T20:33:27","modified_gmt":"2023-09-09T20:33:27","slug":"rock-drilling","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/rock-drilling\/","title":{"rendered":"Rock drilling"},"content":{"rendered":"

Hi all.<\/span><\/span> <\/span><\/p>\n

I began to solve the problem of drilling rock with a chisel.<\/span><\/span> The bit has attachments.<\/span><\/span> The goal is to study the nozzles, how they heat up and deform.<\/span><\/span><\/span><\/p>\n

<\/span><\/span><\/span><\/p>\n

 <\/p>\n

The entire body of the bit is a rigid body. Nozzles are unformable bodies. The rock is SPH particles. It is necessary to evaluate the condition of the nozzles, for example, after 500 meters of drilling. It is impossible to carry out the calculation, because it needs to be carried out not in milliseconds, but in seconds, so that the nozzles experience real stress during rotation. If you carry out the calculation in milliseconds and set the real rotation speed, the nozzles are greatly distorted because the speed increases by 1000.<\/span><\/span><\/span><\/p>\n

The time required to solve the problem with 1 second of calculation is 20k hours. To reduce the solution time, you need to reduce the calculation time or increase the density. A strong increase in density (for example, by 1000 or 10,000) leads to inadequate results, while a decrease sometimes leads to distortion of deformable bodies. <\/span><\/span><\/span><\/p>\n

It turns out a vicious circle: <\/span><\/span><\/span><\/p>\n

You can’t increase the density (too much), but the calculation time is unrealistic. <\/span><\/span><\/span><\/p>\n

Use a powerful cluster, but it will not increase the speed by millions of times. <\/span><\/span><\/span><\/p>\n

Apply the usual method, but there is a big loss of energy. <\/span><\/span><\/span><\/p>\n

Use SPG, but the method is much more complicated. <\/span><\/span><\/span><\/p>\n

Increase the size of the elements, but there will be no accuracy. <\/span><\/span><\/span><\/p>\n

Use a small sector, but it is difficult to transfer to the entire model.<\/span><\/span><\/span><\/p>\n

 <\/p>\n

My question is this. <\/span><\/span><\/span>There is a method for determining the voltage and temperature on the surface of a rigid body. I want to make both the chisel and attachments rigid bodies and use the ADD_WEAR card. Tell me how to determine stress and temperature on the surface of a rigid body? <\/span><\/span><\/span><\/p>\n

If there is another way to solve this problem, tell me? Thank you.<\/span><\/span><\/span><\/p>\n","protected":false},"template":"","class_list":["post-305666","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t