Sage Journals: Discover world-class research

Abstract

The effect of mixed mode I/III loading on the fracture toughness of 7010 aluminium alloy plate was investigated in the peak aged (T6) and overaged (T73) temper conditions. The fracture toughness of 7010 Al alloy was found to remain more or less unchanged with increasing mixed mode I/III loading for both aging tempers. The fracture, in both T6 and T73 tempers, occurred predominantly by a transgranular ductile mechanism of void nucleation, growth and coalescence under mode I as well as mixed mode I/III loading. Primary void formation at brittle intermetallic inclusions and their subsequent coalescence was determined to be the most important step in the fracture process. This coupled with the nature of the stress field ahead of the crack tip under mixed mode I/III loading was then used to explain the insignificant effect of mixed I/III loading on the fracture toughness in 7010 aluminium alloy.

Keywords

7010 ALUMINIUM ALLOY MIXED MODE I/III FRACTURE TOUGHNESS AGING

Get full access to this article

View all access options for this article.

References

Aerospace Materials Specifications, DTD 5636, DTD 5120 and DTD5130, Ministry of Defence, UK, July 1989.

Reynolds

M. A.

, Fitz Simmons

P. E.

and Harris

J. C.

: Proc. Symp. ‘Aluminum alloys in aircraft industry’, 1976, Technocopy Ltd, p. 115.

Pook

L. P.

: Eng. Fract. Mech., 1971, 3, 205–218.

Yoda

: Eng. Fract. Mech., 1980, 13, 647–656.

Schroth

J. G.

, Hirth

J. P.

, Hoagland

R. G.

and Rosenfield

A. R.

: Metall Trans. A, 1987, 18A, 1061–1072.

Kamat

S. V.

, Hirth

J. P.

and Mehrabian

: Ser. Metall., 1989, 23, 523–528.

Raghavachary

, Rosenfield

A. R.

and Hirth

J. P.

: Metall Trans. A, 1990, 21A, 2539–2545.

Manoharan

, Hirth

J. P.

and Rosenfield

A. R.

: Acta Metall. Mater., 1991, 39, 1203–1210.

Gordon

J. A.

, Hirth

J. P.

, Kumar

A. M.

and Moody

N. E.

: Metall. Trans. A, 1992, 23A, 1013–1020.

10.

Eswara Prasad

and Kamat

S. V.

: Metall. Trans. A, 1995, 26A, 1823–1833.

11.

Kamat

S. V.

and Hirth

J. P.

: Acta Mater., 1996, 44, 1047–1054.

12.

Kamat

S. V.

, Srinivas

and Rama Rao

: Acta Mater., 1998, 46, 4985–4992.

13.

Srinivas

, Kamat

S. V.

and Rama Rao

: Mater. Set Technot, 2004, 20, 235–242.

14.

Morere

, Ehrstrom

J. C.

, Gregson

P. J.

and Sinclin

: Metall. Mater. Trans. A, 2000, 31A, 2503–2515.

15.

di Russo

: Mater. Set Technot, 1986, 4, 37–48.

16.

Dorward

R. C.

and Burnsten

D. J.

: Metall. Trans. A, 1995, 26A, 2481–2484.

17.

Ludtka

G. M.

and Laughlin

D. E.

: Metall Trans. A, 1982, 134A, 411–425.

18.

Mukhopadhyay

A. K.

: Metall Mater. Trans. A, 1997, 28A, 2429–2434.

19.

Specifications

Aerospace Materials

, American National Standards,1978, 4197A.

20.

Mukhopadhyay

A. K.

, Reddy

G. M.

, Prasad

K. S.

, Kamat

S. V.

, Dutta

and Mondal

: in ‘Proc. J. T. Staley Honorary Symp. on aluminium alloys’, Indianapolis, USA, Advances in the Metallurgy of Aluminium Alloys, (ed. Tiryakioglu

), 63-71; 2001, Metals Park, OH, ASM International.

21.

ASTM E- 8, Annual Book of ASTM Standards, American Society of Testing and Materials, Philadelphia, PA, V. 3. 01, 2004,62–85.

22.

ASTM E- 399, Annual Book of ASTM Standards, American Society of Testing and Materials, Philadelphia, PA, V. 3. 01, 2004,461–494.

23.

Tada

, Paris

P. C.

and Irwin

C. R.

: in ‘Stress analysis of cracks handbook’, 2). 24; 1973, Hellertown, PA, Del Research Corp.

24.

Kumar

and Mukhopadhyay

A. K.

: Mater. Set Eng. A., to be published.

25.

Kamat

S. V.

and Prasad

N. E.

: Ser. Metall Mater. 1991,25, 1519–1524.

26.

Manoharan

and Lewandowsky

: Int. J. Fract., 1989, 40, R34–38.

27.

Wilshaw

T. R.

, Rau

C. A.

and Tetelman

A. S.

: Eng. Fract. Mech., 1, 1968,191–202.

28.

Ritchie

R. O.

, Francis

and Server

W. I.

: Metall Trans. A, 1976, 7A, 831–846.

29.

Rice

J. R.

and Nicolic

R. J.

: J. Meek Phys. Solids, 1985, 33, 595–604.

30.

Drugan

W. J.

, Rice

J. R.

and Sham

T. L.

: J. Mech. Phys. Solids, 1982, 30, 447–460.

31.

Wang

K. C.

and Luo

X. F.

: in ‘Advances in fracture research’,Vol. 1, (ed. Salama

.), 371; 1989, Oxford, Pergamon.

32.

Pan

and Shih

C. F.

, J. Mech. Phys. Solids, 1990, 38, 161–175.

Effect of mixed mode I/III loading on fracture toughness of 7010 aluminium alloy

Abstract

Keywords

Get full access to this article

References