https://doi.org/10.1016/j.matdes.2018.04.022
1. Critical porosity is estimated in additively manufactured IN718 via crystal plasticity.
2. Porosity is characterized using high resolution tomography.
3. Non-local damage indicator parameters identify the location of fatigue crack initiation.
4. The critical pore size is 20 μm in IN718 with average grain size of 48 μm.
Prashant K. Jha and Robert Lipton
Computer Methods in Applied Mechanics and Engineering, 2019.
https://doi.org/10.1016/j.cma.2019.03.024
Highlights
1. Well-posedness of a general nonlinear state based peridynamic models.
2. A priori numerical convergence rate for finite difference approximations of state based peridynamic models.
3. Numerical verification of convergence rate for samples with growing cracks.
I hope some of you may find this work interesting. We show, analytically and numerically, that strain gradient plasticity predicts the existence of an inner elastic field adjacent to the crack tip, reminiscent of a dislocation-free zone. The fact that elastic strains dominate plastic strains near the crack tip implies a paradigm-shift with respect to previous crack tip asymptotic studies in plasticity and gradient plasticity, which neglect elastic strains.
Emilio Martínez-Pañeda, Norman A. Fleck
I would like to share our recent work published in Nature Communications.
https://www.sciencedirect.com/science/article/pii/S0950061818322116 The mechanical behavior of masonry materials has a common feature: a nonlinear behavior with high compressive strength and very low tensile strength. As a consequence, old masonry buildings generally present cracks due to permanent loads and/or accidental events. Therefore, the characterization of the global dynamic behavior of masonry structures should take into account the presence of existing cracks.
https://www.annalsofgeophysics.eu/index.php/annals/article/view/8025 https://www.researchgate.net/publication/331199456_Experimental_and_num… This paper presents a study on the seismic response of the San Frediano bell tower in Lucca.
