JournalTOCs

International Journal of Hydromechatronics
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Hybrid journal (It can contain Open Access articles)
ISSN (Print) 2515-0464 - ISSN (Online) 2515-0472
Published by Inderscience Publishers

[451 journals]

Explicit implementation of the non-local operator method: a non-local
dynamic formulation for elasticity solid
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  Authors: Abdulaziz Mohammed Alsawafi, Hamed Almuhrzi
  Pages: 3 - 21
  Abstract: This paper presents an explicit non-local operator method (NOM) for the dynamic analysis of elasticity solid problems. The NOM is based on so-called dual-supports, non-local operators and an operate energy functional ensuring stability. The non-local operators are the generalisation of the conventional differential operators. Combined with the variational principle, the non-local governing equations and non-local operator energy functional for linear elasticity solid are derived. The non-local governing equations and non-local operator energy functional are expressed as the integral forms of support and dual-support. The explicit NOM avoids the calculation of the tangent stiffness matrix as in the implicit NOM model. The NOM does not necessitate the use of any shape functions which may be complicated to construct and drastically facilitate the implementation. Several numerical examples are provided to highlight the method's capabilities.
  Keywords: non-local operator method; dual-support; variational principle; operator energy functional; Verlet-velocity algorithm
  Citation: International Journal of Hydromechatronics, Vol. 5, No. 1 (2022) pp. 3 - 21
  PubDate: 2022-04-25T23:20:50-05:00
  DOI: 10.1504/IJHM.2022.122446
  Issue No: Vol. 5, No. 1 (2022)
Solution of structural mechanic's problems by machine learning
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  Authors: Himanshu Gaur, Basim Khidhir, Ram Kishore Manchiryal
  Pages: 22 - 43
  Abstract: This article proposes an analysis procedure of structural mechanics' problem as integral formulation. The methodology is novel which can be suitably applied for finding the solution of engineering problems with required accuracy either it is linear or nonlinear range (plastic range) of the material behaviour. This methodology, which was proposed as a stress-based analysis procedure, exploits the unfolded part of the structural analysis problems which were not so easy to solve such as geometric and material nonlinearity together with simple integration technique (Gaur and Srivastav, 2021). In fracture mechanics, it has already unfolded the misery of physically exploiting the plastic behaviour of structures before the start of the crack for elastic materials (Gaur et al., 2021). The formulation is an integral formulation rather than a differential formulation in which whole stress-strain behaviour is utilised in the analysis procedure by using a neural network as a regression tool. In this article, the one-dimensional problem of uniaxial bar, beam bending problem and plane strain axis-symmetric problem of a cylinder subjected to internal pressure is solved. The results are compared with the existing differential formulation or linear theory.
  Keywords: computational methods; continuum mechanics; machine learning; plastic analysis; elastic materials
  Citation: International Journal of Hydromechatronics, Vol. 5, No. 1 (2022) pp. 22 - 43
  PubDate: 2022-04-25T23:20:50-05:00
  DOI: 10.1504/IJHM.2022.122459
  Issue No: Vol. 5, No. 1 (2022)
Stability analysis of elastic steel beam-column under high temperature
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  Authors: Jinhai Zhao, Zhenqing Wang, Yulai Han
  Pages: 44 - 79
  Abstract: In this paper, the stability analysis method of the elastic beam-column under a load of high temperature is deduced from normal temperature and taking the beam-column with a protective layer in high temperature under the action of uniform load and concentrated load as the example. We analysed the variation law of the stability of the beam-column with temperature changed and use the ANSYS software to analyse the stability of the beam-column with the same condition, and verified the correctness of the method we deduced. Through stability analysis, the stability of the structure under the uniform load is better than that under the concentrated load.
  Keywords: beam-column; strength stability; thermo-solid coupling
  Citation: International Journal of Hydromechatronics, Vol. 5, No. 1 (2022) pp. 44 - 79
  PubDate: 2022-04-25T23:20:50-05:00
  DOI: 10.1504/IJHM.2022.122461
  Issue No: Vol. 5, No. 1 (2022)
Analysis and optimisation of impact wear of diesel engine needle valve
assembly
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  Authors: Lei Gang, Guanghua Huang, Haijun Yuan, Songlin Xia, Wei Tan
  Pages: 80 - 91
  Abstract: Impact wear is one of the main factors of needle valve coupling failure. The dynamic analysis of multiple impacts of needle valve coupling is carried out to obtain the maximum contact stress when the collision is stable, and the wear analysis is carried out based on this stress. The orthogonal experimental design was used to optimise the parameters of needle valve pairs. The results show that the main factor affecting the maximum contact stress is the cone angle of needle valve body, followed by the fillet of needle valve sealing seat surface, and the cone angle difference between needle valve and needle valve body has the least influence. Compared with the original scheme, the maximum contact stress is reduced by 20.7% and the service life is obviously improved.
  Keywords: injector; needle valve coupling; impact wear; optimal design
  Citation: International Journal of Hydromechatronics, Vol. 5, No. 1 (2022) pp. 80 - 91
  PubDate: 2022-04-25T23:20:50-05:00
  DOI: 10.1504/IJHM.2022.122462
  Issue No: Vol. 5, No. 1 (2022)
Sensitivity indices of a reinforced concrete beam exposed to explosions
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  Authors: Lei Gang, Guanghua Huang, Haijun Yuan, Songlin Xia, Wei Tan
  Pages: 92 - 108
  Abstract: Four design parameters, the density and modulus of elasticity of both concrete and steel reinforcement of a reinforced concrete beam in addition to the TNT mass have been utilised to determine the total sensitivity indices of all involved design parameters for the stiffness and the maximum tensile damage of the concrete. Sobol's sensitivity indices has been dedicated to determining the rate and rational effects of each involving design parameter making use of both an experimental method and MATLAB codes. The numerical simulations results using LS-DYNA software have shown that the uncertain TNT mass design parameter has the highest sensitivity with a rational percentage of 40.48% and 42.39% in the variation of the stiffness and the maximum tensile damage responses respectively. While both the density and modulus of elasticity of concrete are the second and the third design parameters with sensitivity indices up to 48.77%.
  Keywords: LS-DYNA; TNT Mass; Sobol's sensitivity indices; stiffness; maximum tensile damage
  Citation: International Journal of Hydromechatronics, Vol. 5, No. 1 (2022) pp. 92 - 108
  PubDate: 2022-04-25T23:20:50-05:00
  DOI: 10.1504/IJHM.2022.122457
  Issue No: Vol. 5, No. 1 (2022)