The results of tests on two high-strength steels, beryllium copper and perspex, together with some published data on high-strength steels were examined to see whether there was any relationship between the fracture mechanics parameter K1C and conventional mechanical properties. It was found that for steels and beryllium copper a correlation appeared to exist between K1C and the zero gauge length strain (= Z/(1 - Z) where Z is the reduction of area measured in a tensile test). It was also found that for constant, K1C was proportional to the square root of Young's modulus. The correlation band for steels was too wide for K1C to be estimated accurately from.
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References
1.
SrawleyJ. E.BrownW. F.‘Fracture toughness testing’, ASTM (in co-operation with NASA) Symp. Fracture toughness testing and its applications, ASTM STP1965381, 133 (American Society for Testing and Materials, Philadelphia, Pa.).
2.
CarterC. S.‘Use of fracture mechanics in engineering problems’, Engineer1965219 (5692), 379.
IrwinG. R.WellsA. A.‘A continuum mechanics view of crack propagation’, Metall. Rev.196510 (38), 223.
5.
JohnsonR. E.‘Fracture mechanics—a basis for brittle fracture prevention’, Paper No. WAPD-TM-505, 1965 (Bettis Atomic Power Laboratory, Pittsburgh, Pa.).
6.
BluhmJ. I.‘Fracture mechanics’, Sae Paper No. 655C, 1963 (Society of Automotive Engineers, New York).
7.
BarenblattG. I.‘Mathematical theory of equilibrium cracks in brittle fracture’, Adv. appl. Mech.19617, 55.
8.
ParisP. C.SihG. C.‘Stress analysis of cracks’, ASTM (in co-operation with NASA) Symp. Fracture toughness testing and its applications, ASTM STP1965381, 30 (American Society for Testing and Materials, Philadelphia, Pa.).
9.
HannaG. L.SteigerwaldE. A.‘Fracture characteristics of structural metals’, Final Summary Report IV-ER-5426, 1963, AD 411509 (Thompson Ramo Wooldridge Inc., Cleveland, Ohio).
10.
BarenblattG. I.‘On some general concepts of the theory of brittle fracture’, Appl. Math. Mech. (PMM)196428 (4), 778.
11.
‘Progress in measuring fracture toughness, and using fracture mechanics’, Mater. Res. and Stand.19644 (3), 107.
12.
BoyleR. W.SullivanA. M.KrafftJ. M.‘Determination of plane strain fracture toughness with sharply notched sheets’. Weld. J., Easton N.Y., 196241 (9), 428s.
13.
‘Fracture testing of high-strength sheet materials: a report of a special ASTM Committee’, Mater. Res. and Stand.19611 (11), 877.
14.
DesistoT. S.CarrF. L.LarsonF. R.‘Influence of section size on mechanical properties and fracture toughness of 7075-T6 aluminium, 6 A1-6 V-2·5 Sn titanium and A151 4340 steel’, Proc. Am. Soc. Test. Mater.196363, 768.
KrafftJ. M.‘Correlation of plane strain crack toughness with strain hardening characteristics of a low, a medium, and a high-strength steel’, Appl. Mater. Res.19643 (2), 88.
17.
YukawaS.McmullinJ. G.‘Effects of specimen size and notch acuity on the brittle fracture strength of a heat treated steel’, J. bas. Engng196183 (4), 541.
BrownW. F.SrawleyJ. E.‘Plane strain crack toughness testing of high strength metallic materials’, ASTM Tech. Pub. No. 410, 1966 (American Society for Testing and Materials, Philadelphia, Pa.).
20.
SrawleyJ. E.JonesM. N.BrownW. F.‘Determination of plane strain fracture toughness’, Mater. Res. and Stand.19677 (6), 262.
21.
PookL. P.‘Correlation of a fracture mechanics parameter with mechanical properties for high-strength steels’, NEL Report No. 225, 1966 (National Engineering Laboratory, East Kilbride, Glasgow).
22.
MulherinJ. H.ArmientoD. F.MarkusH.‘Relationship between fracture toughness and stress concentration factors for several high-strength aluminium alloys’, ASME Paper No. 63-WA-306, 1963.
23.
JohnsonH. H.WillnerA. M.‘Moisture and stable crack growth in a high-strength steel’, Appl. Mater. Res.19654 (1), 34.
24.
BurdekinF. M.StoneD. E. W.‘Crack opening displacement approach to fracture mechanics in yielding materials’, J. Strain Anal.19661 (2), 145.
25.
ASTM Special Committee on Fracture Testing of High-Strength Materials, ‘Screening tests for high-strength alloys using sharply notched cylindrical specimens’, Mater. Res. and Stand.19622 (3), 196.
26.
WesselE. T.HaysL. E.‘Fracture characteristics of some high-strength, weldable, structural steels’, Weld. J., Easton, N.Y., 196342 (11), 512s.
27.
PoorL. P.‘Fracture toughness and fatigue crack propagation characteristics of beryllium copper’, NEL Report No. 297, 1967 (National Engineering Laboratory, East Kilbride, Glasgow).
28.
ParkerE. R.Brittle behaviour of engineering structures1957 (John Wiley and Sons, New York).
29.
SachsG.LubahnJ. D.EbertL. J.‘Notched bar tensile test characteristics of heat treated low alloy steels’, Trans. Am. Soc. Metals194433, 340.
30.
KlierE. P.‘Effect of a fatigue crack on the notch strengthand fracture development in cylindrical specimens of heat treated 4340 steel’, NEL Report No. 5914 (US Naval Research Laboratory, Washington, D.C.).
31.
GilmanJ. J.Cleavage, ductility and tenacity in crystals fracture (AverbachB. L.. editors) 1959, 193 (Wiley, New York).
32.
WellsA. A.‘Strain energy release rates for fractures caused by wedge action’, NRL Report No. 4705, 1956 (US Naval Research Laboratory, Washington, D.C.).
33.
BarroisW.‘Residual static strength of specimens and cracked components’, International Committee on Aeronautical Fatigue, Symposium on Fatigue Design Procedures, Munich 1965 (Pergamon, London) (to be published).
