Investigation of the influence of toughness in the upper shelf and in the transition of the notch impact energy-temperature curve on the load-bearing behaviour and fracture mechanics parameters of notched specimens
In this research project the influence of material toughness on load-bearing and deformation behaviour were investigated. Large double-edged notched and double-edged cracked tensile specimens (DENT/DECT) and small CT-specimens made of two materials were investigated. One material (KS07) was produced specifically with a low notch impact energy in the upper shelf of A(v) = 40 J at T = 80 C. The other material (KS17) was a high toughness quenched fine-grained steel (20 MnMoNi 5 5) with a notch impact energy in the upper shelf of A(v) = 200 J at T = 80 C. The KS17 specimens were tested in the transition area of toughness at T = -20 C. At this temperature KS17 has a notch impact energy of A(v) = 40 J. Testing of the CT-specimens proved that KS17 has considerably higher crack initiation values than KS07 and also a considerably higher crack growth resistance. In agreement with this, the large scale specimens made of KS17 can be subjected to much greater deformations before reaching maximum load than the large scale specimens of KS07. The results show that high toughness materials possess better load and deformation properties in the transition area of toughness than low toughness materials of the same notch impact energy in the upper shelf area.
Bibliographic Reference: EUR 13376 DE (1991) 104 pp., FS, ECU 10
ISBN: ISBN 92-826-0537-X
Record Number: 199110722 / Last updated on: 1994-12-02
Original language: de
Available languages: de