Instrumented Indentation of Materials
1. The loading curve during instrumented indentation is given by P=α_1 h^1.5 for which type of indenter tip:
2. The unloading curve during instrumented indentation using a Berkovich indenter tip is given as (where P is applied load, h is instantaneous depth, hf is final contact depth after unloading, hc is the and hmax is maximum depth, and α2 is constant):
3. The relationship of contact area (A) with the contact depth (hcontact) for a Berkovich tip is:
4. The following portion of the load-displacement curve is used to extract the Young’s modulus of material during instrumented indentation:
5. Which of the following equations govern the evaluation of reduced Young’s modulus from instrumented indentation:
6. Young’s modulus of the material can be obtained from reduced Young’s modulus (E*) via following equation: