A solid-state hydrogen tank presented a critical deformation that blocked its cooling system. The failure originated from the volumetric expansion of metal hydride powders during charge and discharge cycles. To solve it, a 3D pipeline integrating VGSTUDIO MAX, Ansys, and SolidWorks was implemented, allowing simulation of the progressive compaction of the material and prediction of thermal collapse points before they occur in the physical prototype.
3D Pipeline for Cyclic Compaction and Thermal Stress Analysis 🔬
The workflow began with VGSTUDIO MAX to scan and reconstruct the internal geometry of the hydride powder bed after multiple cycles. Zones of excessive compaction were identified where porosity decreased by more than 15%. This data was exported to Ansys to simulate cyclic volumetric expansion, applying variable thermal loads from 20°C to 150°C. The resulting stress maps revealed that accumulated deformation generated a critical contact point against the tank walls. Finally, SolidWorks allowed redesigning the internal spacing and geometry of the cooling coil, eliminating friction points and ensuring fluid circulation.
Invisible Compaction: The Silent Enemy of Hydrogen Systems ⚠️
The greatest challenge was not the initial deformation, but its progressive and imperceptible nature. Each charge cycle slightly compacted the powder, reducing the free space for thermal expansion. Simulation with Ansys showed that after 200 cycles, the accumulated stress exceeded the container's elastic limit. This case demonstrates that material fatigue in metal hydrides depends not only on pressure, but on the interaction between volumetric expansion and thermal degradation. Ignoring this coupling condemns the system to premature mechanical failure.
What is the relationship between thermal blockage temperature and cyclic strain rate in metal hydride fatigue for solid-state hydrogen tanks?
(PS: Material fatigue is like yours after 10 hours of simulation.)