About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Fracture of Steels: New Approaches to Modeling and Experimental Characterization
|
| Presentation Title |
Digital Holographic Microscopy for In-Situ Characterization of Fatigue |
| Author(s) |
Jose Albert Guevara, Yusuke Matsui, Junya Inoue |
| On-Site Speaker (Planned) |
Jose Albert Guevara |
| Abstract Scope |
Digital holographic microscopy (DHM) systems were previously developed for the purposes of in-situ characterization of surface relief formation during mechanical deformation or phase transformation. Traditionally, fatigue was characterized by stopping the mechanical cycling and performing the desired analyses. Not only is this method of poor temporal resolution, i.e. data is only collected at predetermined intervals, but also the actual state of the surface is not captured due to stress relaxation. In DHM, each image captured contains complete three-dimensional quantitative information of the surface, so multiple frames within a single fatigue cycle can be obtained and analyzed. We present characterization of the persistent slip marks (PSM) during the fatigue cycling of martensite and compared to that of 316L stainless steel. It was observed that the growth of the PSMs can be related to the plastic strain, agreeing to the model of localized plastic strain. |