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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Building an ICME Infrastructure: Developing Tools that Integrate Across Length and Time Scales to Accelerate Materials Design
Presentation Title Yield Stress, Proportional Limit: Do They Exist?
Author(s) Robert H. Wagoner
On-Site Speaker (Planned) Robert H. Wagoner
Abstract Scope High-precision mechanical testing of a wide variety of alloys showed, contrary to textbook theory, that significant stress-strain nonlinearity occurs from the onset of metal deformation, i.e. even approaching zero stress. That is, the proportional limit is zero MPa. But atomic bond stretching is known to be linear in these strain ranges. This begs a corollary question: Is plastic yielding occurring at zero MPa? The answer lies in the distinction between thermodynamic and mechanical aspects of plasticity and elasticity. The results show that energy dissipation occurs for any stress-change loop (plastic-like behavior) while permanent offset occurs only above a critical stress (elastic-like behavior below this stress). The micro-mechanism of this remarkable, but generally unrecognized behavior is shown to be a result of the elastic interaction forces among discrete dislocations. For proper meso-scale simulations, these forces must be taken into account.
Proceedings Inclusion? Planned: Supplemental Proceedings volume


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Yield Stress, Proportional Limit: Do They Exist?

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