Accession Number:

ADA090953

Title:

Data Controller System for Fatigue Crack Monitoring Using a Potential Drop Technique.

Descriptive Note:

Technical note,

Corporate Author:

MATERIALS RESEARCH LABS ASCOT VALE (AUSTRALIA)

Personal Author(s):

• Baxter,Barry J.

Report Date:

1979-09-01

Pagination or Media Count:

24.0

Abstract:

This report describes the design of a control unit to interface with 1 a digital voltmeter calibrated to respond to fatigue crack growth, 2 load and cycle data from a servo hydraulic system, and 3 a desk calculator. The calculator is programmed to determine crack length, crack growth rate and stress intensity factors. Pre-set limits on the load and number of cycles permits termination of the test when the levels have been exceeded. Appropriate power supplies for the units have also been designed and are described. Author

Descriptors:

• *CONTROL SYSTEMS
• *MONITORING
• *CRACK PROPAGATION
• *DIGITAL COMPUTERS
• *VOLTMETERS
• STRESSES
• PREDICTIONS
• LOADS(FORCES)
• CRACKS
• INTENSITY
• TEST METHODS
• LENGTH
• POWER SUPPLIES
• FATIGUE(MECHANICS)
• CALIBRATION
• AUSTRALIA
• LIFE TESTS
• CYCLIC TESTS
• CALCULATORS
• HYDRAULIC SERVOMECHANISMS

Subject Categories:

• Computer Hardware
• Hydraulic and Pneumatic Equipment
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE