TY - JOUR
T1 - An ordinary state-based peridynamic model for toughness enhancement of brittle materials through drilling stop-holes
AU - Rahimi, Mohammad Naqib
AU - Kefal, Adnan
AU - Yildiz, Mehmet
AU - Oterkus, Erkan
N1 - 2020 Elsevier Ltd. All rights reserved.
Mohammad Naqib Rahimi, Adnan Kefal, Mehmet Yildiz, Erkan Oterkus, An ordinary state-based peridynamic model for toughness enhancement of brittle materials through drilling stop-holes, International Journal of Mechanical Sciences, Volume 182, 2020, 105773, https://doi.org/10.1016/j.ijmecsci.2020.105773
PY - 2020/9/15
Y1 - 2020/9/15
N2 - In this paper, the ordinary state-based peridynamic (OSB) is used to simulate and study the effects of different-shaped stop-holes with different combinations on crack dynamics in brittle materials in order to establish a detailed knowledge about the toughening effect of internal features that can be in the form of holes and pores. Using the OSB analyses, a new easy-toapply technique is introduced to toughen the materials against crack propagations. As a first case study, the high accuracy of peridynamic approach in damage prediction is demonstrated through solving a collection of numerical and experimental benchmark problems. Moreover, the bi-hole, parabolic, branched, bi-parabolic, and mixed-parabolic combinations of stopholes under tensile loading, and the T-shape, I-shape, bi-linear, linear, and linear-parabolic combinations of stop-holes under shear loading are suggested for notably enhancing material toughness and are practically and functionally compared with each other. Generally, the suggested geometries are proven to be highly effective on toughness enhancement of materials with a relative ease of implementation, in comparison to other internal features such as microcracks. In addition, a further case study is carried out on the effects of the distance of stopholes from the initial crack-tip on crack dynamics and material toughness, in which it is observed that every hole has a specific µ-range, and thus, the crack dynamics are affected by the hole if and only if the crack enters this range. Overall, the arrestment and accelerating effects of the stop-holes on crack dynamics are carefully explained numerically and conceptually, which will help engineers and designers to maximize the positive effects of stopholes on material toughness and design a tougher micro-structural material using easily applied defects.
AB - In this paper, the ordinary state-based peridynamic (OSB) is used to simulate and study the effects of different-shaped stop-holes with different combinations on crack dynamics in brittle materials in order to establish a detailed knowledge about the toughening effect of internal features that can be in the form of holes and pores. Using the OSB analyses, a new easy-toapply technique is introduced to toughen the materials against crack propagations. As a first case study, the high accuracy of peridynamic approach in damage prediction is demonstrated through solving a collection of numerical and experimental benchmark problems. Moreover, the bi-hole, parabolic, branched, bi-parabolic, and mixed-parabolic combinations of stopholes under tensile loading, and the T-shape, I-shape, bi-linear, linear, and linear-parabolic combinations of stop-holes under shear loading are suggested for notably enhancing material toughness and are practically and functionally compared with each other. Generally, the suggested geometries are proven to be highly effective on toughness enhancement of materials with a relative ease of implementation, in comparison to other internal features such as microcracks. In addition, a further case study is carried out on the effects of the distance of stopholes from the initial crack-tip on crack dynamics and material toughness, in which it is observed that every hole has a specific µ-range, and thus, the crack dynamics are affected by the hole if and only if the crack enters this range. Overall, the arrestment and accelerating effects of the stop-holes on crack dynamics are carefully explained numerically and conceptually, which will help engineers and designers to maximize the positive effects of stopholes on material toughness and design a tougher micro-structural material using easily applied defects.
KW - peridynamics
KW - fracture mechanics
KW - non-local approaches
KW - stop-holes
KW - material toughening
UR - https://www.journals.elsevier.com/international-journal-of-mechanical-sciences
U2 - 10.1016/j.ijmecsci.2020.105773
DO - 10.1016/j.ijmecsci.2020.105773
M3 - Article
SN - 0020-7403
VL - 182
SP - 1
EP - 15
JO - International Journal of Mechanical Sciences
JF - International Journal of Mechanical Sciences
M1 - 105773
ER -