Standard: WRC BUL 283

A CRITICAL EVALUATION OF FATIGUE CRACK GROWTH MEASUREMENT TECHNIQUES FOR ELEVATED TEMPERATURE APPLICATIONS

This standard is available for individual purchase.

or unlock this standard with a subscription to IHS Standards Expert

IHS Standards Expert subscription, simplifies and expedites the process for finding and managing standards by giving you access to standards from over 370 standards developing organizations (SDOs).

FEATURES & BENEFITS
  • Maximize product development and R&D with direct access to over 1.6 million standards
  • Discover new markets: Identify unmet needs and discover next-generation technologies
  • Improve quality by leveraging consistent standards to meet customer and market requirements
  • Minimize risk: Mitigate liability and better understand compliance regulations
  • Boost efficiency: Speed up research, capture and reuse expertise
For additional product information, visit the IHS Standards Expert page.

HOW TO SUBSCRIBE
For more information or a custom quote, visit the IHS Contact Us page for regional contact information.
Scope:

This report is a discussion and evaluation of several crack length measurement techniques at elevated temperature. Two of the methods allow direct recording of the crack length signals on analog recorders or on computer peripherals. The same two methods (Compliance determined crack length requiring the MTS Crack Correlator; and an electrical potential drop method) can be utilized at high frequency, do not require visual access to the specimen, nor load cycling interruption and give essentially the same output. Two novel developments have resulted from this work. Firstly, a clip gage measure of specimen mouth COD was developed that functions well at frequencies of up to 60 Hz. Secondly, a dummy specimen was mounted above the test specimen and the electrical potential drop (PD) of the specimen to the dummy was ratioed to eliminate most of the extraneous PD signals and give a linear output of PD to crack length. An electronic amplifier-divider circuit is described that performs this function automatically. Finally these methods were employed to measure the crack growth curves and log da/dN vs log K for 304 stainless steel at 1000° F for stress ratios from 0.01 to 0.7 for both cold rolled and annealed conditions. A minicomputer was utilized in conjunction with this work. The PD method gives the greatest sensitivity of crack length increase but MTS Crack Correlator is also a convenient system to use to obtain accurate and reproducible data.

Organization: Welding Research Council
Document Number: wrc bul 283
Publish Date: 1983-02-01
Page Count: 11
Change Type: NEW ADDITION
Available Languages: EN
DOD Adopted: NO
ANSI Approved: NO
Most Recent Revision: YES
Current Version: YES
Status: Active
Advertisement
Advertisement
Advertisement
Advertisement