Skip to Main Content
Skip Nav Destination
ASTM Selected Technical Papers
Chevron-Notch Fracture Test Experience: Metals and Non-Metals
By
KR Brown
KR Brown
1
Kaiser Aluminum and Chemical Corp.
,
Pleasanton, CA
Search for other works by this author on:
FI Baratta
FI Baratta
2
Army Materials Technology Lab
,
Watertown, MA
Search for other works by this author on:
ISBN-10:
0-8031-1480-X
ISBN:
978-0-8031-1480-7
No. of Pages:
203
Publisher:
ASTM International
Publication date:
1992

Side grooving of specimens can have a pronounced effect on the fracture behavior of aluminum alloys during plane-strain fracture tests. The first part of this paper describes an investigation of the effect of different amounts of side grooving on KIc determined using compact specimens of varying thicknesses machined from a 6061-T651 plate. The results are also related to KIv measurements made on the same material and are discussed in terms of rising R-curve effects on compact and short-bar fracture specimens.

Chevron-notch fracture tests in accordance with ASTM E 1304-89 were also carried out on nominally 13-mm-thick plates of aluminum alloys 2024-T351, 7075-T651, and 8090-T8771. Various specimen orientations were used, including both in-plane and short-transverse loading. Tension and also, where possible, compact specimen fracture tests have also been carried out on the same plates.

Data are presented showing the variation in load-deflection behavior and measured toughness with alloy type, and also with specimen orientation. Correlations of toughness and strength with plate rolling direction have been made. Problems arising from the E 1304 test method are also highlighted.

1.
Barker
,
L. M.
and
Baratta
,
F. I.
, “
Comparisons of Fracture Toughness Measurements by the Short Rod and ASTM Standard Method of Test for Plane Strain Fracture Toughness of Metallic Materials (E 399-78)
,”
Journal of Testing and Evaluation
 0090-3973, Vol.
8
, No.
3
,
05
1980
, pp. 97–102.
2.
DeJong
,
H. F.
, “
Thickness Direction Inhomogeneity of Mechanical Properties and Fracture Toughness as Observed in Aluminum 7075-T651 Plate Material
,”
Engineering Fracture Mechanics
 0013-7944, Vol.
13
,
1980
, pp. 175–192.
3.
Munz
,
D.
, “
Determination of Fracture Toughness of High Strength Aluminum Alloys with Chevron-Notched Short Rod and Short Bar Specimens
,”
Engineering Fracture Mechanics
 0013-7944, Vol.
15
,
1981
, pp. 231–236.
4.
Guest
,
R. V.
, “
Progress Report: The Effect of Specimen Size on Short Rod Fracture Toughness Measurements of Aluminum
,” in
Proceedings
, 26th National SAMPE Symposium,
04
1981
,
SAMPE
,
Los Angeles
, pp. 536–542.
5.
Barker
,
L. M.
, “
Specimen Size Effects in Short-Rod Fracture Toughness Measurements
,”
Chevron-Notched Specimens: Testing and Stress Analysis
, ASTM STP 855,
American Society for Testing and Materials
,
Philadelphia
,
1984
, pp. 117–133.
6.
Brown
,
K. R.
, “
The Use of the Chevron-Notched Short-Bar Specimen for Plane-Strain Toughness Determination in Aluminum Alloys
,”
Chevron-Notched Specimens: Testing and Stress Analysis
, ASTM STP 855,
American Society for Testing and Materials
,
Philadelphia
,
1984
, pp. 237–254.
7.
Eschweiler
,
J.
,
Marci
,
G.
, and
Munz
,
D. G.
, “
Fracture Toughness of an Aluminum Alloy from Short Bar and Compact Specimens
,”
Chevron-Notched Specimens: Testing and Stress Analysis
, ASTM STP 855,
American Society for Testing and Materials
,
Philadelphia
,
1984
, pp. 255–269.
8.
Morrison
,
J.
,
Gough
,
J. P.
, and
KarisAllen
,
K. J.
, “
Comparison of Chevron-Notched Specimen Types for Fracture Toughness Testing of Aluminum
,”
Journal of Testing and Evaluation
 0090-3973, Vol.
17
, No.
1
,
01
1989
, pp. 14–19.
9.
Barker
,
L. M.
, “
Chevron-Notched Specimens for Fracture Toughness Measurements Independent of R-Curve Effects
,”
Journal of Testing and Evaluation
 0090-3973, Vol.
17
, No.
4
,
07
1989
, pp. 218–223.
10.
Peel
,
C. J.
, “
The Present Status of the Development and Application of 8090 and 8091 Alloys
,”
Proceedings
, ASM Aluminum-Lithium Symposium,
Westec, Los Angeles
,
1988
,
American Society for Metals
,
Metals Park,OH
.
11.
Starke
,
E. A.
and
Quist
,
W. E.
, “
The Microstructure and Properties of Aluminum-Lithium Alloys
,” AGARD Lecture Series No. 174 on New Light Alloys, AGARD-LS-174,
Advisory Group for Aeronautical R&D
,
Neuilly Sur Seine, France
,
09
1990
.
12.
Morrison
,
J.
and
KarisAllen
,
K. J.
, “
Orientation Dependence of Fracture Toughness in 8090 Aluminum Alloy Plate Using Chevron Notched Specimens
,”
Proceedings
, ECF8, Fracture Behaviour and Design of Materials and Structures,”
Turin
, Vol.
II
,
1990
, pp. 327–333.
13.
Damage Tolerant Design Handbook
, Vol.
3
,
Metals and Ceramics Information Center
,
Columbus, OH
,
1983
.
This content is only available via PDF.
You do not currently have access to this chapter.
Close Modal

or Create an Account

Close Modal
Close Modal