The recent accident on a human gyroscope ride has brought focus to a predictable yet devastating mechanical failure: the rupture of the intermediate ring shaft due to combined multiaxial fatigue. The forensic analysis, supported by a 3D pipeline combining Agisoft Metashape for digital reconstruction of the part and LS-DYNA for dynamic load simulation, reveals how cyclic stresses in multiple directions exceeded the material limit.
3D Reconstruction and Explicit Simulation: The Digital Autopsy of the Failure 🛠️
The workflow began with Agisoft Metashape, processing 347 photographs of the shaft remains to generate a high-resolution mesh. This geometry was imported into LS-DYNA, where boundary conditions replicating the load history were applied: combined rotation of the inner, intermediate, and outer rings. The results showed stress concentrations at the shaft fillet radius, with an estimated fatigue life of 18,000 cycles, well below the 50,000 expected by design. The failure mode was ductile with high-cycle fatigue propagation.
The Gyroscope That Wanted to Be an Astronaut and Ended Up in the Workshop 🎢
The moral of this story is that it is not enough for a ride to look like it came from a spaceship; its shafts need to withstand a Friday night with excited teenagers. The original design may have trusted that steel would be eternal, but multiaxial fatigue reminded it that even metals need a break. Now, the gyroscope rests in the workshop while engineers review whether the next shaft will come with a certificate of resistance to human fun.