Fretting fatigue poses is a vexing source of failure in many contacting systems[1,2]. The details of fretting, however, are poorly understood and offer a new frontier for fatigue research. Several exciting developments have recently emerged [3-5] that combine novel experimental methods with detailed numerical calculations. The work of Farris and Sakagami [3-5] has provided a new paradigm for investigating fretting contacts and fretting fatigue. The present work expands upon the pioneering work of Sakagami and Fan-is by exploring direct measurements of slip zones in a model plane stress sample geometry. The proposed method aims to provide fundamental experiments that can be used to develop accurate models of slip zone mechanics.
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