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Molecular Dynamics Simulation Of Fracture Behaviour In Nanocrystalline Fcc Structures, Linqing Pei

University of Wollongong Thesis Collection 1954-2016

The study of material failure has always been very important for human beings. Previous studies were mostly conducted at the macroscopic and microscopic scale based on continuum mechanics. However, the effect of nanostructural features on fracture has not been fully understood. Therefore, it is necessary to investigate the fracture mechanics at the atomic scale. Computational modelling, particularly atomistic (or molecular) simulation is becoming an increasingly important technology with which to analyse fracture. In this thesis, molecular dynamics (MD) simulations were carried out to investigate the fracture behaviours in Face Centred Cubic (fcc) nanocrystals.

Nanotwinned Copper (Cu) has an unusual combination …

Application Of Acoustic Emission Monitoring To Pipeline Fracture Tests, Turbadrakh Chuluunbat

University of Wollongong Thesis Collection 1954-2016

Maximization of benefits in the oil and gas transportation industries requires an increase in the size and operating pressure of the pipeline, which in turn requires an increase in the strength of line pipe steel. To ensure reliable operation, public safety, and environmental protection, the design of pipelines must include strategies for controlling fractures. Identifying defect(s) where crack initiation is possible and predicting the crack propagation are of great importance when considering fracture control of pipelines.The current research is aimed at developing an improved method using the acoustic emission (AE) technique for determining fracture initiation and propagation in the line …