Indian Institute Of Technology



MHRD Govt. Of India


Elastic Modulus

Objective

To evaluate the elastic modulus of materials using Nanoindentation

Introduction

Reduced elastic modulus represents the elastic deformation that occurs in both sample and indenter tip.Reduced modulus can be calculated by:

H=Pmax/(Acontact)


Where,

E* = Reduced Modulus
E= Modulus of the specimen
E'=Modulus of the indenter
V= Poisson's ratio of the specimen
V'= Poisson's ratio of the indenter

For each loading and partial unloading cycle, the curve is plotted between load with depth which provides information about hardness, elastic modulus and plasticity of the material under examination.

Methodology

In this experiment a nanoindenter tip of known geometry is projected into the selected location on the material surface of the material to be tested. The load is continuously increased till a designated maximum value, after which we partially unload the material until desired depth is attained. Next holding segment is introduced to allow the material to relax before unloading. The process is repeated many times and position of the indenter tip and the surface is monitored with a differential transformer. The modulii values are calculated using the img/formulae given above.

Results

Following are the modulii evaluated for some of the materials:
UHMWPE
UHMWPE-2Al2O3
UHMWPE-5Al2O3

Conclusions

Click the following link for conclusions:
All of above



VIRTUAL EXPERIMENTS

Please Select one of the following to view the behavior
UHMWPE UHMWPE-2Al2O3 UHMWPE-5Al2O3 All of above