Hi All -
Looking for some theory help. I am doing some writing for work showing why resistive heating elements bend and warp due to magnetic fields. The material - MoSi2 - is used for heating applications up to 1900C. I was talking to one of the Field Applications Engineers at the factory, and he said that one of the main causes of element warpage is due to the magnetic field induced by the high current flowing through the heating elements, causing bowing due to the repelling forces of the field.
For context, these are U-shaped elements (like a hairpin) that see upwards of 100A under full load. The cross section of the heated length is only 3mm. I know the “right handed rule of magnetic fields”, but that is about it. For a better understanding, I would like to calculate how much mechanical force the elements actually see at load - e.g., the element legs are repelling each other with a force of 1 oz in.
A fun, complicated problem for which I don’t have the theoretical background. @ChrisGammell - any ideas on resources?