Fracture Parameter Estimation of Alloy Steel Reinforced with Maraging Steel

Bhat, Sunil; Ukadgaonker, Vijay G.; Jha, Mahendra; Nirgude, S. M

doi:10.1007/1-4020-4972-2_177

Cited by 1 publication

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“…Therefore, crack propagation is mainly governed by residual strains occurring in the 2D membrane (as observed previously in similar experiments for graphene). 22 Under these conditions the appropriate expression for estimating K C was derived by Bhat 23,24 (see additional information in SI6). where E is the three-dimensional elastic modulus and c is the radius of the imaged crack.…”

Section: Resultsmentioning

confidence: 99%

Confined Crack Propagation in MoS₂Monolayers by Creating Atomic Vacancies

et al. 2021

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In two-dimensional crystals, fractures propagate easily, thus restricting their mechanical reliability. This work demonstrates that controlled defect creation constitutes an effective approach to avoid catastrophic failure in MoS2 monolayers. A systematic study of fracture mechanics in MoS2 monolayers as a function of the density of atomic vacancies, created by ion irradiation, is reported. Pristine and irradiated materials were studied by atomic force microscopy, high-resolution scanning transmission electron microscopy, and Raman spectroscopy. By inducing ruptures through nanoindentations, we determine the strength and length of the propagated cracks within MoS2 atom-thick membranes as a function of the density and type of the atomic vacancies. We find that a 0.15% atomic vacancy induces a decrease of 40% in strength with respect to that of pristine samples. In contrast, while tear holes in pristine 2D membranes span several microns, they are restricted to a few nanometers in the presence of atomic and nanometer-sized vacancies, thus increasing the material’s fracture toughness.

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Section: Resultsmentioning

confidence: 99%