Experimental study and numerical simulation of magnetization involved in S235 sheets used in the construction of ship hulls

Thermal stress can be used to control the strength of the magnetic field generated by ferromagnetic materials. This effect is used to reduce magnetic related risks in a ship hull. In the present study, we are going to discuss the usefulness of this technique to reduce magnetic losses in marine sheets – used in the construction of ship hulls – by using a ferromagnetic material, namely structural steel (S235). The characterization of this metal is made by using the Epstein frame in an alternating field at 50 Hz frequency. A recent study was conducted at the Algerian Electro-industries company in a city named Azaaga in Kabylia. The experiment consisted of two samples of four sheets of steel of 4 mm thick. One sample was submitted to a normalization annealing temperature of 912 °C for thirty minutes, and then followed by a period of slow cooling in the same oven. Then a comparison is made between the results of the experiment with and without normalization annealing temperature. The experimental B-H curves obtained are then integrated successfully in the finite elements code developed in MATLAB software, using the Rayleigh hysteresis model. Simulations results are in accordance with the preceding measurements.

Abstract licence: CC BY-NC

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