CCES 

Project 6 - Sauvik Banerjee

Objectives :

1. Development of numerical models using finite element package, LSDYNA, for the simulation of AE waveforms in nuclear containment structures. This will mainly involve the following:
• accurate modeling of the AE events, e.g, cracking and tendon wire or rebar breaks.
• study dispersion characteristics of AE waveforms generated by these event in concrete structures.
• Establish a direct correlation between the AE signals and the fracture mechanisms
2. Investigation of the influence of heterogeneities like aggregates, pores, reinforcement bars and prestressing tendons on wave propagation.
3. Experimental implementation and validation of the computational results.
4. Extension of the numerical simulation studies to a scaled pressurized containment structure.

Deliverables :

1. Study dispersion characteristics of AE waveforms generated by fracture events. Investigate the influence of heterogeneities on AE signals. Prepare experimental setup and concrete specimens, and conduct experiments and attempt to establish direct correlation between AE signals and fracture processes. Fine tune the computer models for validation with the experimental results.
2. Extend the numerical simulation studies to a scaled pressurized containment structure.
3. Problem description for monitoring containment / cylindrical shell model and beam specimens with AE system and associated modeling requirements. Both the qualitative and quantitative AE signal interpretation will be evolved with help of PI numerical modeling software.
4. Sharing of the AE test data on beam samples for benchmarking the computer code for evolution of numerical analysis procedure. A few numerical simulations will be made at PC/CC end in BARC with the trial version of the code and associated subroutines to be supplied by PI along with the AE test data.
5. Sharing of the AE test data on cylindrical specimens and joint review with PI of the validated simulation code and AE test data for its application.