Some Nouns That Magnetic Material Practitioners Must Know(4)

12. Hardness and Strength

Hardness refers to the ability of a material to resist the local pressure of hard objects into its surface. It is an indicator to compare the softness and hardness of various materials. The higher the hardness, the stronger the resistance of a metal to plastic deformation.

(1)Strength refers to the maximum capacity of a material to resist the destructive action of external forces. Strength is divided into different forms of external force:

(2)tensile strength (tensile strength), refers to the external force is the ultimate strength of tension.

(3)compressive strength, the strength of the external force is pressure limit.

(4)bending strength, axis vertical refers to the external force and material, and material after the effect to make the ultimate strength of bent.

13. Fracture Toughness

It usually reflects the strength of crack expansion in the material, and the unit is MPa·m1/2. The fracture toughness of the material should be tested by tensile testing machine, stress sensor, extensometer, signal amplification dynamic strain gauge, etc. In addition, the sample should be made into thin sheets.

14. Impact Strength (impact fracture toughness)

The energy absorbed by the fracture process of the reaction material under impact stress is J/m2. The measured value of impact strength is too sensitive to the size, shape, machining accuracy and test environment of the sample, and the dispersion of the measured value will be relatively large.

15.Bending Strength

Three point bending method is used to measure the bending fracture strength of materials. Because the sample is easy to process and simple to measure, it is most commonly used to describe the mechanical properties of sintered ndFeb magnets.