The Use of Small, Pre-Cracked Bend Specimens for Quality Control Purposes.
Abstract
The difficulties involved in using valid ASTM K sub (Ic) specimens for quality control purposes are described. It is shown from tests on steels and titanium alloys that values of K sub (Ic) can be obtained at lower cost from small specimens. If fracture initiation occurs before general yield, K sub (Ic) can be determined from the load required to cause crack extension. If fracture occurs after general yield, K sub (Ic) can be determined from the critical plane strain crack tip opening displacement or from the notch root contraction. The effect of a steeply rising plane strain R-curve can be corrected by using a newly developed R-extrapolation technique. Simplified versions of the methods involved are described whereby small specimens can be used to determine whether a material satisfies specifications for quality control. These simplified versions require little or no calculation for quality control-testing once master nomographs have been drawn up. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1973
- Accession Number
- AD0773596
Entities
People
- Alan S. Tetelman
- Isaac Roman
- John N. Robinson
Organizations
- University of California, Los Angeles