New method for analyzing small-scale fracture-specimen data in the transition zone

Conference · Fri Jan 01 04:00:00 EST 1982

OSTI ID:6724652

Merkle, J G

Among the problems related to the use of small specimens for measuring fracture toughness, those concerning size effects and data scatter are perennial. An attempt was made to find a suitable method for adjusting individual small specimen fracture toughness values for size effects in the transition range of temperature. The method selected was one already proposed by Irwin. Irwin's ..beta../sub Ic/ equation recognizes an interaction between toughness and size. If either toughness increases or size decreases, the ratio K/sub c//K/sub Ic/ will increase. This interaction magnifies the scatter inherent in plane strain K/sub Ic/ values. Although the more common application of the ..beta../sub Ic/ formula is the estimation of K/sub c/ values from known values of B and K/sub Ic/, the original application was the one considered here, i.e., the estimation of K/sub Ic/ from measured values of B and K/sub c/. So the new aspect of the application described here is mainly the use of small specimen test data, analyzed inelastically.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 6724652
• Report Number(s): CONF-821037-30; ON: DE83001925
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ACCURACY
ALLOYS
DUCTILE-BRITTLE TRANSITIONS
FRACTURE PROPERTIES
IRON ALLOYS
IRON BASE ALLOYS
MECHANICAL PROPERTIES
MOCKUP
STEELS
STRUCTURAL MODELS
TEMPERATURE DEPENDENCE
TEST FACILITIES