Dr. D. Kujawski's Research

 

Dr. D. Kujawski

Experimental setup of specimen in testing machine with corrosive chamber at Fatigue and Fracture Laboratory.

Dr. Daniel Kujawski is the director of Fatigue and Fracture Laboratory which conducts research in the fields of inelastic material behavior, fatigue, fracture, and stress analysis at notches. Investigations address experimental, theoretical, and applied problems concerned with macro- and micro-damage mechanisms, fatigue sensors, crack growth, and life prediction for metals and advanced composites. The overall objective is to develop tools for predicting long-term strength of industrial materials and components, and to contribute towards damage tolerant design concept. Current research on corrosion fatigue and stress corrosion cracking has been continuously funded since 2010 by the Office of Naval Research. The overall goal of this research is to develop a consistent two-parameter approach to both fatigue crack initiation and propagation. It is well-recognized that fatigue crack initiation and propagation are affected by a number of variables such as applied stress and strain, geometry or stress concentration, and environment. The final objective is to implement the proposed modeling into UNIGROW software for fatigue life prediction in navy applications.

In May 2015 Dr. Kujawski received an award from the WMU Faculty Research and Creative Activities Award (FRACAA) for a project titled “An Interactive Web-Based Fatigue Analysis Tool”. The aim of this project is to develop an interactive web-based fatigue analysis tool, which may be easily accessed by means of multiple platforms, such as desktop and laptop computers, tablets and/or smart-phones. A self-explanatory, web-based educational version will allow the users to learn the fatigue fundamentals as well as to expand and master their knowledge on modern fatigue analysis methods. It will benefit engineering students in their design courses and the capstone senior design projects. Graduate students will expand their fatigue knowledge by using this tool for verification and benchmarking of their own and others’ approaches.

 

During May and June 2015 Dr. Kujawski and his graduate student Joshua Teo participated in the WMU Innovation Corps (I-Corps) program. During this program a strong industrial demand for an interactive web-based fatigue analysis tool has been identified. Such tool can bridge the existing gap between universities and the needs of design and test engineers in small, medium and large size companies. 

Microscopic view of fracture surface of 7075-T651 Al alloy specimen tested in 3.5% NaCl solution.

Slow strain rate test results of 7075-T651 Al alloy in air and 3.5% NaCl solution.