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ASTM Selected Technical Papers
Instrumented Impact Testing
By
TS DeSisto
TS DeSisto
1
Army Materials and Research Center
,
Watertown, Mass. 02172
;
symposium chairman
.
Search for other works by this author on:
ISBN-10:
0-8031-0738-2
ISBN:
978-0-8031-0738-0
No. of Pages:
220
Publisher:
ASTM International
Publication date:
1974

The dynamic fracture toughness was determined for two titanium alloys (Ti-6A1-4V and Ti-6A1-6V-2Sn) from different suppliers and in various heat-treated conditions. The strain-rate effect associated with the dynamic test is shown to increase the fracture toughness for all the alloys with the exception of mill-annealed and duplex-annealed Ti-6A1-6V-2Sn, where the fracture toughness was found to be independent of strain rate. Dial energy per unit specimen area (W/A)d for precracked Charpy specimens can be used to calculate KId as long as a relatively flat fracture appearance (small shear area) is obtained. Otherwise, when a large amount of shear is present, the energy to maximum load (W/A)m or Pmax from the load-time trace must be used to calculate KId.

1.
Amateau
,
M. A.
,
Hanna
,
W. D.
, and
Kendall
,
E. G.
, “
F-15 Program Final Report: Ti-6A1-6V-2Sn and Ti-6A1-4V Fatigue Crack Propagation
,” ATR-72-(9990)-3,
Material Science Laboratory, Aerospace Corp.
, El Segundo, Calif.,
29
09
1971
.
2.
Hartbower
,
C. E.
,
Reuter
,
W. G.
, and
Crimmins
,
P. P.
, “
Tensile Properties and Fracture Toughness of 6A1-4V Titanium
,” AFML-TR-68-163,
Air Force Materials Laboratory, Wright-Patterson Air Force Base
, Ohio, Vol.
1
,
09
1968
, and Vol.
2
,
03
1969
.
3.
Ronald
,
T. M. F.
,
Hall
,
J. A.
, and
Pierce
,
C. M.
, “
Some Observations Pertaining to Simple Fracture Toughness Screening Tests for Titanium
,” AFML-TR-311,
Air Force Materials Laboratory, Wright-Patterson Air Force Base
, Ohio,
03
1971
.
4.
Dull
,
D. L.
and
Raymond
,
L.
,
Metallurgical Transactions
 0026-086X, Vol.
3
,
11
1972
, pp. 2943–2947.
5.
Server
,
W. L.
, “
Dynamic Fracture Toughness Determined From Instrumented Pre-Cracked Charpy Tests
,” TR 8 (UCLA-ENG-7267), Materials Dept., School of Engineering and Applied Science,
University of California
, Los Angeles,
08
1972
.
6.
Brown
,
W. F.
, Jr.
and
Srawley
,
J. E.
in
Plane Strain Crack Toughness Testing of High-Strength Metallic Materials, ASTM STP 410
,
American Society for Testing and Materials
,
1966
, p. 13.
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