The explosion of a cryogenic tank in a stem cell bank not only destroyed years of research but also raised a critical question: was it an external impact or an internal failure? To answer this, a forensic engineering team combined industrial tomography, thermal simulation, and photogrammetry. The goal was clear: to reconstruct the exact second when the vacuum of the Dewar vessel collapsed.
The forensic workflow: from deformation to simulation 🔬
The process began with a CT scan of the deformed tank using Volume Graphics VGSTUDIO MAX. This software allowed analysis of the double-walled stainless steel geometry, identifying microcracks and dent patterns. The deformation data was exported to ANSYS, where the instantaneous vacuum loss and subsequent expansion of liquid nitrogen were simulated. In parallel, RealityCapture generated a 3D model of the accident scene from photographs, enabling correlation of debris positions with calculated pressure trajectories. The key to the analysis was comparing stress distribution: an external impact generates a concentric dent with radial cracks, while a defective weld produces a clean fracture along the thermal seam.
Lessons to avoid the next catastrophe ⚠️
The results indicated that the cause was a microcrack in the internal weld, not an impact. The simulation showed that the vacuum loss occurred in less than 0.3 seconds, generating a pressure wave of 15 bar. This case demonstrates that 3D forensic analysis not only solves accidents but also redefines non-destructive inspection protocols for cryogenic tanks. The industry now requires periodic CT scans instead of simple hydrostatic tests.
Could a 3D model have predicted the structural failure due to thermal fatigue in the Dewar neck before the catastrophic explosion?
(PS: Simulating catastrophes is fun until the computer melts down and you are the catastrophe.)