Understanding the Load-Displacement Curve in Nanoindentation - Micro Material UK

Interpreting nanoindentation data involves analyzing the load-displacement curve, which provides key mechanical properties of the material.

Key Parameters:

1. Hardness (H):
   • H=PmaxAH=APmax​​
   • Pₘₐₓ: Maximum applied load
   • A: Contact area at maximum load
   • Indicates resistance to deformation.
2. Elastic Modulus (E):
   • Derived from the unloading slope of the curve.
   • Higher values mean a stiffer material.
3. Creep & Time-Dependent Behavior:
   • Holding phase shows viscoelastic or plastic deformation.
4. Plastic vs. Elastic Deformation:
   • The ratio of elastic recovery to total indentation depth shows material resilience.

Load-Displacement Curve Analysis:

• Steeper slope in unloading → Higher modulus.
• Large plastic deformation → Lower resilience.
• Hysteresis loop (for cyclic loading) reveals energy dissipation.

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