Image AddedSet two or more key frames making sure their value actually match the frame number they are on. Set the interpolation of all key frames to linear or the exported simulation won't look right.
Image AddedOpen the USD Cache Exporter via the Atoms Crowd Toolbar Button: Exporters > USD Cache Exporter
Image AddedThere are few options in the UI:
Level sequence
Export path
Cache Start Frame: The simulation will start exporting only from this frame in the sequencer. The "Set Start Cache Frame" button will take the start frame of the sequencer range and set on the "Cache Start Frame" field
Start Sim Frame: The simulation won't start until this frame in the sequencer. The "Set Start Sim Frame" button will take the start frame of the sequencer range and set on the "Start Sim Frame" field
Texture Resolution X/Y: the resolution for the exported textures
Assets Path: in case your USD cache should reference assets previously exported, you can assign the root path for those assets
Once all the fields are set you can click export.