Mumetal Metalwork: Bending 0.004" Permalloy-80 for 6" Radius

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SUMMARY

This discussion focuses on the bending of 0.004" Permalloy-80 sheets to create a magnetic shield with a 6" radius curvature. Users confirm that gentle bending does not damage the magnetic properties of the material, as evidenced by successful enclosures created with smaller radii (14cm and 8cm). The consensus is that thin sheets of Permalloy-80 maintain their performance even after bending, making it suitable for applications requiring magnetic shielding against 50 Hz mains interference.

PREREQUISITES
  • Understanding of magnetic shielding materials, specifically Permalloy-80.
  • Knowledge of bending techniques for thin metal sheets.
  • Familiarity with the effects of mechanical stress on magnetic properties.
  • Experience in designing magnetic enclosures for electromagnetic interference (EMI) protection.
NEXT STEPS
  • Research the mechanical properties of Permalloy-80 and its behavior under bending stress.
  • Learn about the fabrication techniques for creating magnetic shields using thin metal sheets.
  • Explore the effects of different bending radii on the magnetic performance of materials.
  • Investigate other materials suitable for magnetic shielding in similar applications.
USEFUL FOR

This discussion is beneficial for engineers, materials scientists, and hobbyists involved in electromagnetic shielding projects, particularly those working with Permalloy-80 and similar materials.

Ravaner
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Hello ! I'm going to use thin ( 0.004" ) sheet of Permalloy-80 to realize a magnetic shield ( against european 50 Hz mains ). I have to bend this sheet to give it a 6" radius curvature. I would like to know if this treatment will not dammage and annihilate the magnetic properties of this material.
 
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Bending a thin sheet so gently should not change the material's properties.
 
I have used mumetal to make 2 enclosures one with a 14cm radius and one about 8. The material seems to be performing well
 
Very useful replies. many thanks.