Document Type
Article
Publication Date
2-28-2022
Publisher
American Institute of Physics
Source Publication
Journal of Applied Ethics
Source ISSN
0021-8979
Original Item ID
DOI: 10.1063/5.0078182
Abstract
Spall failure is of interest due to its prevalence in high strain rate problems in which the spallation is driven by the interaction of release waves. In this article, a porosity-based damage model that includes microinertial effects is used to examine spall failure. The model is successfully calibrated to plate impact-driven experiments and then used to evaluate experimental conditions producing more extreme strain rate conditions, such as those in laser-driven experiments. The incorporation of microinertia allows us to better understand the increase in apparent macroscopic spall strength seen at high strain rates. Correspondingly, we conclude that the incorporation of microinertial effects improves the model’s predictive capabilities. Microinertial effects result in more severe local tensile stresses that affect the damage evolution, and microinertia can play a significant role in the approach to the material’s ideal strength at extreme loading rates. A preliminary parametric study is also carried out to investigate the role of microstructural aspects such as nucleation volume fraction and initial pore radius. One counter-intuitive result from the microinertial effects is that, for a given nucleation site volume fraction, having larger initial pore nucleation sites can lead to an improved macroscopic spall strength.
Recommended Citation
Qamar, S. B.; Moore, John A.; and Barton, Nathan R., "A Continuum Damage Approach to Spallation and the Role of Microinertia" (2022). Mechanical Engineering Faculty Research and Publications. 316.
https://epublications.marquette.edu/mechengin_fac/316
Comments
Accepted version. Journal of Applied Physics, Vol. 131, No. 8 (February 28, 2022): 85901. DOI. © 2022 American Institute of Physics. Used with permission.