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The ductility cannot be estimated
by any means. It is extremely difficult to use the
results from these tests analytically to accurately describe
plastic deformation in other applications. This
drawback is being addressed by instrumented indentation
test standards (ISO 14577 (Metallic materials –
Instrumented indentation test for hardness and materials
parameters) and efforts underway at ASTM). The
commercial importance of hardness testing cannot be
underestimated and justifies an entire Sect. 7.3 devoted
entirely to hardness.