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Examining the Correlation between the Peak Tensile Stress and Free Surface Velocity Measurements for Spall.
| 题名： | Examining the Correlation between the Peak Tensile Stress and Free Surface Velocity Measurements for Spall. |
| 作者： | Becker, R.; Callaghan, K. |
| 关键词： | Fracture (mechanics), Tensile stress, Velocimeters, Velocity, Micromechanics, Models, Inertia, Finite element analysis, Loads (forces), Equations of state, Simulations, Spall, Velocimetry, Visar, Voids, Pressure release waves, Ale (arbitrary lagrange-eulerian), Ale finite element, Rate dependence, Ptw (preston-tonks-wallace) |
| 摘要： | The peak tensile stress at the spall plane in simulations explicitly modeling the growth and coalescence of voids from a random population of void nucleating particles is compared with the spall stress inferred from free surface velocity measurements. For square pulse loadings where the tensile stress exceeded the stress to initiate void growth, the peak tensile stress achieved at the spall plane dropped quickly and did not propagate outside of the spall process zone. The transient peak stress is reduced before the wave propagates. The remaining stress pulse that does leave the spall process zone propagates to the free surface with the expected degradation with propagation distance. Additional simulations on brittle materials also show that, for specimens loaded well above the spall stress, the peak stress can be released too quickly for it to propagate outside of the spall zone, and that the stress pulse received at the free surface may not reflect the peak stress at the spall plane. |
| 报告类型： | 科技报告 |
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