Determining Residual Stresses in Ferromagnetic Materials by Barkhausen Noise Measurement

摘要

Residual stresses have strong influence on in-service behaviour of structuralcomponents. Depending on their nature, magnitude and distribution they cancontribute for increasing the expected life of a component or for its prematurefailure. Generally, the manufacturing processes of structural componentsintroduce residual stresses in the component. The use of non-destructive methodsfor detection and measurements of residual stresses have been increasing in thelast years, because they do not promote changes in the material underexamination and do not interfere in its later use. The non-destructive testmethod based on Barkhausen emissions from ferromagnetic materials is sensible tochanges in microstructural characteristics and the stress state of the materialand can be used to evaluate these materials characteristics. This paper presentsa study on the use of Barkhausen Noise Analysis in detection and measurement ofresidual stresses in ferromagnetic materials. The results are compared with theones obtained from the Hole-Drilling Strain-Gage Method.