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International journal of solids and structures, 2023-06, Vol.273, p.112230, Article 112230
2023
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Autor(en) / Beteiligte
Titel
Local–nonlocal stress-driven model for multi-cracked nanobeams
Ist Teil von
  • International journal of solids and structures, 2023-06, Vol.273, p.112230, Article 112230
Ort / Verlag
Elsevier Ltd
Erscheinungsjahr
2023
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
  • Exact closed-form solutions for multi-cracked Euler–Bernoulli nanobeams are provided by proposing two equivalent approaches. The considered multi-cracked nanobeams are modeled with a well-posed local–nonlocal stress-driven model and contain an arbitrary number n of isolated damaged cross-sections. In order to simulate the damaged sections, it is assumed that the nanobeam bending flexibility contains n Dirac delta functions, with a Dirac delta located at each damaged section: this representation of cracked sections, already used in local problem, is adopted for the first time here in the local–nonlocal stress-driven model. The first approach providing closed-form solutions is based on the integral definition of the local–nonlocal stress-driven model, where the bending curvature is given by the superposition of the local and nonlocal phases, and the nonlocal phase is an integral convolution of the bending moment. This approach provides an integro-differential equation, which is solved by taking firstly the Laplace transform and then the anti-transform. In the second approach, it is shown that the integral definition of the stress-driven multi-cracked nanobeam model is equivalent to a differential equation together with suitable constitutive boundary conditions. This equation is solved by making use of Laplace transform again. The two approaches provide the same solution, with the second one resulting computationally faster. Interesting results show that a jump of the rotation at the damaged cross-sections occurs in local beam, but does not occur in pure nonlocal nanobeams (i.e. local phase is absent): contrary to the local elasticity theory, the bending curvature of pure nonlocal nanobeams has no singularity at damaged sections. The typical stiffness increase, due to the increase in nonlocal fraction of the mixture or to the increase in the length-scale parameter, also appears in multi-cracked nanobeams and this stiffening nonlocal effect is more pronounced in more constrained nanobeams. •Local–nonlocal stress-driven model (SDM) for nanobeams with an arbitrary number of cracks.•Exact closed-form solutions.•Solution based on the integral definition of the SDM.•Solution based on a differential equation with constitutive boundary conditions.•Deflection line without slope discontinuity in contrast to the local elasticity.
Sprache
Englisch
Identifikatoren
ISSN: 0020-7683
eISSN: 1879-2146
DOI: 10.1016/j.ijsolstr.2023.112230
Titel-ID: cdi_crossref_primary_10_1016_j_ijsolstr_2023_112230
Format
Schlagworte
Crack, Dirac delta, Nanobeam, Nonlocal theory

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