Bending strength predictions of cross-laminated timber plates subjected to concentrated loading using 3D finite-element-based limit analysis approaches

Abstract The design of counter-acts for the Ormen Lange Northern Field Development has previously been considered in other publications. Counter-acts were used to ensure pipeline stability during pipe-lay along route curves. The counter-acts were large diameter steel cylinders installed with self-weight penetration. The in-place design was completed with use of advanced Finite Element Analysis (FEA) program Abaqus and validated in parallel by the finite difference (FD) program, FLAC. This paper will present a comparison of the previous work to advanced 3D Finite Element Limit Analysis (FELA) with use of the software OPTUM G3. 3D FELA is newly developed for geotechnical design. The paper will show the advantage of the FELA which is based on the principles of limit analysis. The counter-act design is particularly complex and given the cylindrical shape with no internal base plate. This will challenge the element types in the FELA model. Further, the soil conditions are amongst the softest clay encountered in Norway further increasing the complexity of the design.

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An algorithm for adaptive introduction and arrangement of velocity discontinuities within 3D finite-element-based upper bound limit analysis approaches

Computer Methods in Applied Mechanics and Engineering ◽

10.1016/j.cma.2018.12.017 ◽

2019 ◽

Vol 348 ◽

pp. 875-911 ◽

Cited By ~ 2

Author(s):

M. Li ◽

J. Füssl ◽

M. Lukacevic ◽

J. Eberhardsteiner ◽

C.M. Martin

Keyword(s):

Finite Element ◽

Upper Bound ◽

Limit Analysis ◽

3D Finite Element ◽

Upper Bound Limit Analysis

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Performance enhancement of normal contact ratio gearing system through correction factor

JOURNAL OF MECHANICAL ENGINEERING AND SCIENCES ◽

10.15282/jmes.13.3.2019.03.0429 ◽

2019 ◽

Vol 13 (3) ◽

pp. 5242-5258

Author(s):

R. Ravivarman ◽

K. Palaniradja ◽

R. Prabhu Sekar

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Correction Factor ◽

Bending Strength ◽

Performance Enhancement ◽

Transmission Ratio ◽

Contact Ratio ◽

Element Analysis ◽

Normal Contact ◽

Root Region

As lined, higher transmission ratio drives system will have uneven stresses in the root region of the pinion and wheel. To enrich this agility of uneven stresses in normal-contact ratio (NCR) gearing system, an enhanced system is desirable to be industrialized. To attain this objective, it is proposed to put on the idea of modifying the correction factor in such a manner that the bending strength of the gearing system is improved. In this work, the correction factor is modified in such a way that the stress in the root region is equalized between the pinion and wheel. This equalization of stresses is carried out by providing a correction factor in three circumstances: in pinion; wheel and both the pinion and the wheel. Henceforth performances of this S+, S0 and S- drives are evaluated in finite element analysis (FEA) and compared for balanced root stresses in parallel shaft spur gearing systems. It is seen that the outcomes gained from the modified drive have enhanced performance than the standard drive.

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