According to classical mechanics definition, if the material properties are the same in all direction, material is called isotropic. The word isotropy means uniformity in all orientations and it is derived from the Greek isos “equal” and tropos “way.” Consequently, if material properties are not isotropic, they are called anisotropic. This is a general definition of isotropy. What Pettit et al. [1] in their discussion mean most likely is what is so called “plastic anisotropy,” using Lankford coefficient, which is used to evaluate the distortion in yield surface in metal forming operations and is used for materials that have experienced large plastic deformation during a process. This is a measure of plastic anisotropy, rather than a general measurement of variation of properties in different orientations.

The way the tests have been conducted in the experiment by Ladani et al. [2] is...

References

References
1.
Pettit
,
C.
,
Mullen
,
J.
,
Bhave
,
T.
, and
Kraft
,
F. F.
,
2015
, “
Discussion: Mechanical Anisotropy and Strain Rate Dependency Behavior of Ti6Al4V Produced Using E-Beam Additive Fabrication
,”
ASME J. Eng. Mater. Technol.
,
137
(
3
), p.
031006
10.1115/1.4030341.
2.
Ladani
,
L.
,
Razmi
,
J.
, and
Choudhury
,
S. F.
,
2014
, “
Mechanical Anisotropy and Strain Rate Dependency Behavior of Ti6Al4V Produced Using E-Beam Additive Fabrication
,”
ASME J. Eng. Mater. Technol.
,
136
(
3
), p.
031006
.10.1115/1.4027729
3.
Svensson
,
M.
, and
Ackelid
,
U.
,
2010
, “
Titanium Alloys Manufactured With Electron Beam Melting Mechanical and Chemical Properties
,”
Materials and Processes for Medical Devices Conference (MDM V)
,
Minneapolis, MN
, Aug. 10–12, ASM International, Materials Park, OH, pp.
189
194
.
4.
Ladani
,
L.
,
2015
, “
Local and Global Mechanical Behavior and Microstructure of Ti6Al4V Parts Built Using Electron Beam Technology
,”
144th Annual Meeting & Exhibition
(
TMS 2015
),
Orlando, FL
, Mar. 15–19.
5.
Roy
,
L.
, and
Ladani
,
L.
,
2013
, “
Mechanical Behavior of Ti-6Al-4V Manufactured by Electron Beam Additive Fabrication
,”
ASME
Paper No. MSEC2013-1105.10.1115/MSEC2013-1105
6.
Ladani
,
L.
,
Harvey
,
E.
,
Choudhury
,
S. F.
, and
Taylor
,
C. R.
,
2013
, “
Effect of Varying Test Parameters on Elastic–Plastic Properties Extracted by Nanoindentation Tests
,”
Exp. Mech.
,
53
(
8
), pp.
1299
1309
.10.1007/s11340-013-9732-7
You do not currently have access to this content.