Streak Camera for Monitoring Dynamic Damage and Failure of Elastomers and Heterogeneous Materials
Abstract
Abstract Plate impact experiments are designed to produce plane wave loading in order to simplify the connection between measured wave profiles and the dynamic material response that is being investigated. When the target material is homogeneous and strongly heterogeneous damage or failure does not occur, the resulting wave profiles are essentially uniform spatially and the wave profiles can be monitored by single point interferometry. However, when the materials are strongly heterogeneous, as well as when damage or failure occurs over length scales that need to be resolved to investigate the underlying mechanisms, then the waves arriving at the surface where the motions are being measured are non-uniform spatially. Consequently, point-wise interferomeric methods become inadequate. This inadequacy has been overcome in recent years by the development of line-imaging interferometry in which motions are recorded at points along a line. Various interferometers can be used to generate the spatially-imaged fringes. These instruments are called line VISARs where VISAR is the acronym for Velocity Interferometer System for Any Reflector. The key element in such instruments is a streak camera for recording the fringes corresponding to the motions at points along the selected line. This proposal is primarily for the streak camera required to implement line VISAR interferometry in the Plate Impact Facility at Brown University. Having such capability will represent a transformational change in the capability of this Facility for studying damage, failure, and the non-uniform waves that arise when the samples are heterogeneous. Immediate application will be on an ONR-supported investigation of the dynamic tensile strength of elastomers as well as the interfacial strengths of bonds between elastomers and a variety of substrates: steel, glass, PMMA. Similarly important will be the investigation of the non-uniform stress waves that propagate through such heterogeneous materials as composites that mechanically mimic energetic materials.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- May 22, 2016
- Source ID
- N000141512939
Entities
People
- Rodney Clifton
Organizations
- Brown University
- Office of Naval Research
- United States Navy