Graduate student Noah Al-Shaer will be defending his thesis titled “An Application of a Web-Based Platform for Hosting Chaboche-Type Tensile and Torsional Material Models.”

Noah Al-Shaer’s thesis defense

• Date: Thursday, April 23
• Time: 2-3 p.m.
• Location: IST 1048
• Current major: M.S. student of mechanical engineering and B.S. mechanical engineering
• Thesis committee chair: Dr. Navindra Wijeyeratne
• Committee members: Dr. Ali P. Gordon, Dr. Sanna Siddiqui and Dr. Mary Vollaro

Abstract

Constitutive models are widely used to characterize the behavior of engineering materials. The constitutive models can be used for a variety of materials and loading conditions to portray how a material behaves under cyclic conditions.

This proposal focuses on the creation of constitutive models that have time dependent and independent conditions. The time dependent models can better capture the unified behavior of material to account for the effects of temperature. Time independent models allow for the use of simpler modeling parameters or predictions to be used within the constitutive models.

The proposed models can be altered with the type of data being inserted using waveforms to represent strain. A framework that can have data extracted after set cycles are completed can be used for life predictions of a material. For the data extracted, equations that account for the cyclic nature of the data have to be used to best represent the material behavior. A novel pure shear cyclic constitutive model is proposed to approximate the cyclic true-stress, true-strain behavior under pure shear loading. This method allows for the use of more loading profiles within constitutive models.

The performance of the various constitutive models will be extensively compared to experimental data of various materials and loading profiles. Using the various constitutive models developed, a user-interface that will be hosted within a web-based service can be used to simulate various materials and loading profiles based on the inserted materials and modeling parameters. The proposed research will significantly increase the accessibility of the constitutive models used to simulate cyclic behavior for different materials. This accessibility will allow for greater number of simulations to test the cyclic behavior of materials without the complexity of having to develop the constitutive model.

Biography: Noah Al-Shaer is a master’s student in mechanical engineering at Florida Polytechnic University. His research focus is on material characterization of metals using constitutive models to examine the impacts of cyclic loading. The aim of his research is to improve the accessibility of these constitutive models through the use of a website to host the material models.