Location

Snowmass Village, CO

Start Date

1-1-1995 12:00 AM

Description

Several techniques are now available for testing specimens for imminent failure modes. These include ultrasonic, eddy current, radiography and thermal imaging techniques for detection of cracks; X-ray, low angle neutron diffraction and magnetic techniques for the detection of residual stresses and microstructural. While techniques such as ultrasonics and eddy currents lend themselves to portability and show excellent sensitivity in detection of micro-cracks that have already formed, their sensitivity to the stages leading to formation of the micro cracks viz. changes in microstructure and residual stress patterns is not adequate for repeatable and reliable measurements. X ray and low angle neutron diffraction methods on the other hand permit absolute measurements of the residual stress profile in the specimen, however these are not easily portable and are necessarily destructive in nature because they require a specimen to be cut from the component in order to perform these examinations.

Volume

14B

Chapter

Chapter 8: NDE Systems, Reliability, and Transferability

Section

NDE Systems

Pages

2325-2329

DOI

10.1007/978-1-4615-1987-4_296

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Magneprobe: A Computerized Portable System for Non Destructive Evaluation of Surface Conditions in Ferritic Components

Snowmass Village, CO

Several techniques are now available for testing specimens for imminent failure modes. These include ultrasonic, eddy current, radiography and thermal imaging techniques for detection of cracks; X-ray, low angle neutron diffraction and magnetic techniques for the detection of residual stresses and microstructural. While techniques such as ultrasonics and eddy currents lend themselves to portability and show excellent sensitivity in detection of micro-cracks that have already formed, their sensitivity to the stages leading to formation of the micro cracks viz. changes in microstructure and residual stress patterns is not adequate for repeatable and reliable measurements. X ray and low angle neutron diffraction methods on the other hand permit absolute measurements of the residual stress profile in the specimen, however these are not easily portable and are necessarily destructive in nature because they require a specimen to be cut from the component in order to perform these examinations.