A NEW CRACK GROWTH TEST SYSTEM AND ITS APPLICATION TO K-CONTROLLED FATIGUE CRACK GROWTH TESTS AT ELEVATED TEMPERATURES

A new automated crack growth test system using an image processing technique is described in this paper. The system consists of a mechanical stage with a CCD camera, an image processing unit and a personal computer. In the tests a CCD camera with an image guide scope was used to monitor the microscopic image of a crack tip. The image around the crack tip was processed and analysed by using a template-scanning technique to make a real-time recognition of the crack tip. The crack length was determined from the crack tip location and the crack growth rate and stress intensity factor were calculated and recorded on a magnetic medium. The system was applicable to various fracture mechanics tests, with no limitations in sample shape, environment etc. Several K-controlled fatigue crack growth tests, both at room- and elevated temperatures were conducted to demonstrate the reliability and precision of the system.

• Supplemental Notes:
  • J Soc Materials Sc, Japan, v 40 n 449, Feb 1991, p 235 [7 p, 17 ref, 10 fig]
• Authors:
  • NISHIKAWA, I
  • Mirikawa, H
• Publication Date: 1991

Language

• Japanese

Subject/Index Terms

• TRT Terms: Analysis; Computers; Cracking; Information processing; Tests
• Uncontrolled Terms: Computer systems; Crack growth
• Old TRIS Terms: Computer analysis; Computer generated imagery
• Subject Areas: Data and Information Technology; Marine Transportation;

Filing Info

• Accession Number: 00700433
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Aug 14 1995 12:00AM