Stress-Strain State and Buckling Problems of Structurally-Anisotropic Aircraft Panels Made of Composite Materials in View of Production Technology

Boitsov, B. V.; Gavva, L. M.; Endogur, Askold; Firsanov, V. V.

doi:10.3103/s1068799818040049

Cited by 10 publications

(2 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Another important field of interest is aircraft engineering , in which some shell and frame structures are subjected to torsional stresses: indeed, both fuselage [ 3 , 66 , 67 , 68 , 69 ] and wings [ 53 , 70 , 71 ] must fulfil geometric constraints to be as light as possible and face bending and torsional loads. To withstand these loads during take-off, flight, and landing, avoiding fatigue or static failure, these components must be specifically designed, with ad hoc features that guarantee increased stiffness and structural integrity.…”

Section: Introduction: the Destructive Power Of Torsional Load And The Extended Interest In Itmentioning

confidence: 99%

Torsion—Resistant Structures: A Nature Addressed Solution

2021

View full text Add to dashboard Cite

The complexity of torsional load, its three-dimensional nature, its combination with other stresses, and its disruptive impact make torsional failure prevention an ambitious goal. However, even if the problem has been addressed for decades, a deep and organized treatment is still lacking in the actual research landscape. For this reason, this review aims at presenting a methodical approach to address torsional issues starting from a punctual problem definition. Accidents and breaks due to torsion, which often occur in different engineering fields such as mechanical, biomedical, and civil industry are considered and critically compared. More in depth, the limitations of common-designed torsion-resistant structures (i.e., high complexity and increased weight) are highlighted, and emerge as a crucial point for a deeper nature-driven analysis of novel solutions. In this context, an accurate screening of torsion-resistant bio-inspired unit cells is presented, taking inspiration specifically from plants, that are often subjected to the torsional effect of winds. As future insights, the actual state of technology suggests an innovative transposition to the industry: these unit cells could be prominently implied to develop novel metamaterials that could be able to address the torsional issue with a multi-scale and tailored arrangement.

show abstract

Section: Introduction: the Destructive Power Of Torsional Load And The Extended Interest In Itmentioning

confidence: 99%

Torsion—Resistant Structures: A Nature Addressed Solution

2021

View full text Add to dashboard Cite

show abstract

“…Presently, three-dimensional printing technology is developing rapidly (You et al, 2017;Jacobs and Lin, 2017;Park et al, 2017;Smith et al, 2018;Tyburec et al, 2019). This happens due to the need to create products of complex shape, the production of which by existing standard methods is very laborious and disadvantageous, and sometimes technically impossible (Kinash et al, 2017;Boitsov et al, 2018;Du et al, 2018). A large number of works have been done on the topic of use of additive technologies, in particular a review (Uriondo et al, The study aimed to investigate the problem of temperature stability of a thin-walled cylindrical structure under unsteady local thermal exposure, simulating the motion of a laser beam spot along one of the ends.…”

Section: Introductionmentioning

confidence: 99%

Research of the Problem of Loss of Stability of Cylindrical Thinwalled Structures Under Intense Local Temperature Exposure

Kurbatov¹,

Orekhov²,

Rabinskiy³

et al. 2020

PTQ

View full text Add to dashboard Cite

Presently, three-dimensional printing technology is developing rapidly. This happens due to the need to create products of complex shape, the production of which by existing standard methods is very difficult and disadvantageous, and sometimes technically impossible. The study aims to investigate the problem of temperature stability of a thin-walled cylindrical structure under unsteady local thermal exposure, simulating the motion of a laser beam spot along one of the ends. To solve the problem, the finite element method was used. Since the geometric areas of calculation were parameterized, then for each set of parameters, its own finite element mesh was used for each type of analysis. A parametric spatial finite element model of cylindrical shell pinched at the bottom end was constructed. The local moving heat flux acts on the opposite side, simulating the movement of a laser beam during the additive formation of a thin-walled element. Numerical solutions of the nonstationary dynamic heat conduction problem were obtained, spatiotemporal temperature dependences were obtained, and solutions of the quasistatic problem of the loss of both local and complete loss of stability of the equilibrium state of the cylinder at various times due to the occurrence of local compressive stresses during intense heating were obtained. The dependences of critical heat flux power corresponding to the loss of stability on the cylinder wall thickness and its height were obtained. The above results can be used as calibration parameters of the process of creating thin-walled structures using additive technologies of Laser Melting class for products that require increased requirements for manufacturing accuracy.

show abstract