Structural and Vibration Analysis of Polymeric Functionally Graded Plates

Functionally graded materials (FGMs) are advanced engineered materials whereby material composition and properties vary spatially in the macroscopic length scale. Accurate analytical and numerical models for prediction of mechanical behaviour and damage of the FG plate are required as their applications in industry grow. During manufacturing process of FG plates, the reliability requirements for the product should be considered to meet desired or application-specific performance criteria. One approach to produce polymeric FG plates is use of additive manufacturing like 3D printing, which can control local composition and microstructure. In addition, the material characterisation of 3D printed FG plates is a critical factor for prediction of mechanical behaviour and damage. Furthermore, this research is tended to be a first step towards the analytical and numerical solution of structural behaviour of FG plate with in-plane variation of stiffness. This project also develops 3D DIC experimental approach for deflection measurement of FG plates. Analytical solution for static stress analysis of thin and thick FG plates with variation of stiffness through the length of the plate carries out. Then the numerical simulation achieves using graded elements which implements by user material subroutines (UMAT and USDFLD). After that, an analytical formulation for damage of FGMs with considering coupled damage-plasticity framework presents. The implementation of analytical formulation performs using UMAT subroutine in the ABAQUS software using a robust three-step numerical algorithm. In order to validate the graded elements, a physical model of FG plates designs and manufactures by means of 3D printing to carry out a new 3D-DIC experimental test. Another aim of experimental tests is characterisation and identification of damage parameter and material properties to validate with numerical simulation. Generally, the results of analytical and computational modelling with physical experiments provide valuable contribution for studying structural prediction of complex FG structure. The research will be beneficial for real life application of functionally graded plates in engineering structures by localised stiffness improvement in order to reduce localized deformation for light weight structural design in aerospace such as wing component.

Name thesis:degree_name

PhD

Level thesis:degree_level

Doctoral

Discipline thesis:degree_discipline

Mechanical Engineering

Grantor dc:publisher

ResearchSpace@Auckland

Year dc:date.issued

2017

Author dc:creator

• Amirpourmolla, Maedeh

Advisors dc:contributor.advisor

• Bickerton, S
• Das, R
• Mace, B
• Calius, E

Statement dc:rights

• Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher.

Licence dc:rights.uri

• https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm

Handle dc:identifier.uri

https://hdl.handle.net/2292/37106

OAI identifier oai:identifier

oai:researchspace.auckland.ac.nz:2292/37106