Abstracts - Conference Planning and Management - Iowa State ...

Experimental and Model Developments of Interfacial Mechanical Integrity of
Layered Stacks
Ben Burke
Iowa State University
Department of Aerospace Engineering, Ames IA 50011-2271, US
Phone: 515-294-3039, Email: bastaw@iastate.edu
Hui Wang
Iowa State University, Ames IA
Wei Hong
Iowa State University, Ames IA
Ashraf Bastawros
Iowa State University, Ames IA
Abstract:
A novel method is developed to measure the adhesion and cohesion energies for ultrathin films, with no
specimen preparation. The technique utilizes combination of nanoindentation and nano-accoustic
emission (AE) measurement techniques. The total fracture energy is acquired from the displacement
excursion on the load-indentation depth curve. The fracture energy partition between the adhesive and
cohesive mode is done via the measured AE energy ratio for each event. Preliminary measurements of
adhesive and cohesive energies for Nitrogen-doped silicon carbide, SiCxNy has been carried out.
Detailed Finite element analysis is carried out using cohesive elements/surfaces. The analysis is utilized
to set the applicability limits of the proposed technique and overcome several of the measurements
limitations.
277 ABSTRACTS