Journal
JOURNAL OF MATERIALS RESEARCH
Volume 37, Issue 6, Pages 1201-1215Publisher
SPRINGER HEIDELBERG
DOI: 10.1557/s43578-022-00520-6
Keywords
Damage tolerance; Crack trajectory; Work of fracture; Architectures; Feature engineering
Categories
Funding
- Max-Planck Society [17MAX001]
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This study constructs Morse-Code architectures of dot and dash features in PMMA materials using varying morphologies and arrangements of holes and splats. The crack tip driving force is determined through finite element simulations, and the fracture resistance is measured experimentally. The results show that the right combination of features can significantly enhance the fracture resistance of the material.
A combination of varying hole and splat morphologies and arrangements were used to construct Morse-Code architectures of dot and dash features in single edge notch bend specimens of PMMA. The crack tip driving force was determined in terms of the normalized energy release rate (G) for these features by finite element simulations. Selected architectures were laser micro-machined and tested. The fracture resistance measured in terms of initiation work of fracture and total work of fracture per unit area from experimental load (P)-crack opening displacement (COD) curves shows that the right combination of these features can provide 20-24 times higher fracture resistance than the bulk solid. While hole-like features led to crack tip blunting, the splat-like feature led to crack deflection. The enhanced damage tolerance in materials containing combination of such features can guide design of architectures in intrinsically porous structures produced by additive or subtractive routes.
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