Barkhausen noise analysis in practice: Residual stress

Barkhausen noise gives a response to the residual stress state and reacts to both micro and macro stresses.

Barkhausen noise does not directly give quantitative value for stress state determination.  However, with well controlled sample set, where only the residual stress state of a given sample changes, the Barkhausen noise analysis can give a good correlation between the residual stress and Barkhausen noise values.

Due to the physical interaction between magnetostrictive and elastic lattice strains, the magnetic properties of ferromagnetic materials depend on their stress condition.

Movements of magnetic domain walls cause Barkhausen noise signal. Magnetic domains are restructured/re-oriented due to the stress:

  • Under tensile stress the domain walls move more easily which increases the Barkhausen noise signal amplitude.
  • Under compressive stress the domain wall movement is restricted, and the Barkhausen noise signal amplitude is lower.

We provide Barkhausen noise inspection systems for a wide range of steel components in following automation levels:

RoboScan

Inline/Robot Systems

RoboScan is an automated grinding burn and heat treatment defect detection system that can be integrated into production line.

GearScan 500 and user

Automated systems

Automated systems for quality inspection are tailored for offline use. Easy to use software makes inspections intuitive and systems can adapt to various component types.

CrankScan 200 with user

Semi-Automated systems

Semi-automated and manual Barkhausen noise analysis systems are suitable for low volume measurements. The most simple Barkhausen noise measurements can be performed handheld with only a sensor and analyzer.

Barkhausen noise analysis with Rollscan 350 and general purpose sensor.

Manual systems

Manual Barkhausen noise stands are grinding burn and heat treatment defect detection systems for low-volume applications.