Journal Published Online: 01 May 2001
Volume 29, Issue 3

Direct Measurement of Displacement in Instrumented Charpy Impact Testing for Structural Integrity Assessment



The present research aims to develop a method for the direct measurement of load-line displacement during instrumented Charpy impact tests. The method involves direct measurement of the load-line displacement using a laser interferometer in addition to the load-line displacement derived from the load signal by double integration according to standard procedures. The ISO striker edge is instrumented with a piezoelectric sensor and the system is calibrated in situ in the impact tester as recommended by ISO 14556:2000 Steel Charpy V-notch Pendulum Impact Test—Instrumented Test Method, using a 0.5% accuracy reference load cell and a hydraulic jack system.

Introductory tests were conducted using fatigue precracked and V-notched specimens in the temperature range + 23 to −80°C on a conventional ship grade steel NVE36 for application in floating production, storage, and off-loading (FPSO) vessels. The results were promising and good correlation was obtained with results from conventional instrumented impact testing where the load-line displacement was calculated by double integration of the force versus time plot.

Author Information

Tronskar, JP
Det Norske Veritas Pte. Ltd., Singapore
Mannan, MA
National University of Singapore
Lai, MO
National University of Singapore
Pages: 12
Price: $25.00
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Stock #: JTE12252J
ISSN: 0090-3973
DOI: 10.1520/JTE12252J