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您的检索式：作者名="Henry PROUDHON"
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| 1 | Using machine learning and a data-driven approach to identify the small fatigue crack driving force in polycrystalline materials显示文摘The propagation of small cracks contributes to the majority of the fatigue lifetime for structural components.Despite significant interest,criteria for the growth of small cracks,in terms of the direction and speed of crack advancement,have not yet been determined.In this work,a new approach to identify the microstructurally small fatigue crack driving force is presented.Bayesian network and machine learning techniques are utilized to identify relevant micromechanical and microstructural variables that influence the direction and rate of the fatigue crack propagation.A multimodal dataset,combining results from a high-resolution 4D experiment of a small crack propagating in situ within a polycrystalline aggregate and crystal plasticity simulations,is used to provide training data.The relevant variables form the basis for analytical expressions thus representing the small crack driving force in terms of a direction and a rate equation.The ability of the proposed expressions to capture the observed experimental behavior is quantified and compared to the results directly from the Bayesian network and from fatigue metrics that are common in the literature.Results indicate that the direction of small crack propagation can be reliably predicted using the proposed analytical model and compares more favorably than other fatigue metrics. | Andrea Rovinelli Michael D.Sangid Henry Proudhon Wolfgang Ludwig | 2018 | npj Computational Materials2018，，1： | 4 |
| 2 | Three-dimensional finite element analysis of shallow indentation of rough strain-hardening surface显示文摘Three-dimensional finite element modeling of the contact between a rigid spherical indenter and a rough surface is presented when considering both the loading and unloading phases. The relationships among the indentation load, displacement, contact area, and mean contact pressure for both loading and unloading are established through a curve fitting using sigmoid logistic and power law functions. The contact load is proportional to the contact area, and the mean contact pressure is related to the characteristic stress, which is dependent on the material properties. The residual displacement is proportional to the maximum indentation displacement. A proportional relationship also exists for plastically dissipated energy and work conducted during loading. The surface roughness results in an effective elastic modulus calculated from an initial unloading stiffness several times larger than the true value of elastic modulus. Nonetheless, the calculated modulus under a shallow spherical indentation can still be applied for a relative comparison. | Chenghui GAO Henry PROUDHON Ming LIU | 2019 | Friction2019，7，6： | 2 |
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