Subscription required for access to full text. License restrictions may limit access.
Summary:
This paper describes experiences and special testing techniques applied to JR-curve development using compact specimens ranging in size by factors up to 20. All specimens were 20 percent side-grooved. The material used was A508 Class 2A and the tests were made at 477 K (400¿̐ưF). Unloading compliance was used to measure crack growth and a special displacement measuring gage having high sensitivity and linearity was developed to detect minute compliance changes of the order of 0.1 percent. High-temperature creep effects were present but these were readily eliminated from interfering with unloading compliance precision by prior partial unloading to below the creep deformation range. Crack growth was calculated using a differential compliance formula and was usually predicted accurately within ¿̐ư15 percent of the heat tint indicated growth. This was generally true over a wide range of specimen sizes and initial crack sizes.
Dates of Publication and/or Sequential Designation:
Also available online via the World Wide Web. Tables of contents and abstracts freely available; full-text articles available by subscription. Full text article also available for purchase. Also available in PDF edition.
Reproduction Note:
Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 1983. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
