登入
選單
返回
Google圖書搜尋
A More Basic Approach to the Analysis of Multiple-Specimen R-Curves for Determination of Jc
KW. Carlson
JA. Williams
出版
ASTM International
, 1981
URL
http://books.google.com.hk/books?id=fYx4zgEACAAJ&hl=&source=gbs_api
註釋
Multiple specimen J-R curves were developed for groups of 25.4-mm-thick (1T) compact specimens with different a/W values and depth of side grooving. The purpose of this investigation was to determine Jc (J at the onset of crack extension) for each group. Judicious selection of points on the load versus load-line deflection record at which to unload and heat-tint specimens permitted direct observation of approximate onset of crack extension. It was found that the present recommended procedure for determining Jc from multiple-specimen R-curves, which is being considered for standardization, consistently yielded nonconservative Jc-values. A more basic approach to analyzing multiple-specimen R-curves is presented, applied, and discussed. This analysis determined Jc-values that closely corresponded to actual observed onset of crack extension.
