Stress Chromic Polymeric Coatings for Visual Detection of Overstress Conditions Primary Researchers: Robert L. Mullen Department of Civil Engineering Case Western Reserve University, Cleveland, OH 44106, USA E-mail: rlm@po.cwru.edu, Tel. (216) 368-2423 Roberto Ballarini Department of Civil Engineering Case Western Reserve University, Cleveland, OH 44106, USA E-mail: rxb7@po.cwru.edu, Tel. (216) 368-2963 National Science Foundation award information Slides from B. Thornton's Seminar November 1998 Abstract:  The objective is to develop a series of liquid crystalline (LC) stress chromic coatings for rapid identification of over-stress conditions in the components of the infrastructure, such as highway bridges. These coatings change color when subjected to stress/strain. The material can be formulated to return to the original color once the stress/strain is removed, or the color change can remain for weeks.      Diacetylene liquid crystalline polymers are the materials of choice because of their stress chromic properties. The development of this coating will allow the easy visual detection of stress levels in a material and allow a more accurate identification of flaws  (cracks) in structures. Early detection should reduce the cost of maintenance and repair and ensure safe structures.   Acknowledgment: The authors acknowledge support from the National Science Foundation's Grant CMS 9713954 CWRU Department of Civil Engineering Main Menu | Sitemap | Department Activities | On-Campus Menu                 Communication Click to request a Graduate | Undergraduate Application Form. Click to get in touch with a Graduate | Undergraduate Student. Click to Schedule a Tour of the Department.