Experimental and numerical study on the cyclic performance of the gear-bolt semi-rigid joint under uniaxial bending for free-form lattice shells

<p>Free-form and bionic spatial shells are popular in the area of spatial structures. Scallop-shaped surface is the product of evolution and a kind of spatial shells that can satisfy the mechanical requirements. Based on the scallop-shaped lattice shells, this paper focused on the optimization of geometric parameters. The principle of minimum strain energy was applied to conclude the influence law of the geometric parameters on mechanical properties. Finally the optimal values of geometric parameters were obtained. The results show that the optimization of geometric parameters presents the integrated significance to improve scallop-shaped lattice shells.</p>

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Numerical study of a desaturation process by air injection in sandy soil

MATEC Web of Conferences ◽

10.1051/matecconf/202133702004 ◽

2021 ◽

Vol 337 ◽

pp. 02004

Author(s):

Sebastian Sepulveda-Cano ◽

Edwin F. Garcia-Aristizabal ◽

Carlos A. Vega-Posada

Keyword(s):

Numerical Study ◽

Characteristic Curve ◽

Cyclic Strength ◽

Air Injection ◽

Coarse Grained ◽

Free Form ◽

Void Space ◽

Injection Wells ◽

Sandy Deposit ◽

Desaturation Process

This work aims to numerically study the desaturation process in a coarse-grained sandy deposit by means of air injection. It is well-known that the soil cyclic strength to liquefaction of a saturated, sandy deposit is positively affected by the presence of gas in the void space in either a dissolved or a free form. A numerical study is performed to investigate some of the factors affecting the desaturation advance and controlling the soil desaturation process by air injection. Among these factors are: a) soil-water characteristic curve and intrinsic permeability (hydraulic parameters), b) injection time, and c) standard approach to two injection wells placement. Only the standard mechanisms of biphasic flow are investigated (i.e., incompressible and isothermal biphasic flow in an isotropic homogeneous porous media with capillary effects).

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Experimental and numerical study on the performance of new prefabricated connections for free-form grid structures

Structures ◽

10.1016/j.istruc.2021.12.060 ◽

2022 ◽

Vol 36 ◽

pp. 1050-1067

Author(s):

Guan Quan ◽

Jiafeng Qi ◽

Hui Wu ◽

Jun Ye ◽

Boqing Gao ◽

...

Keyword(s):

Numerical Study ◽

Free Form

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The Effect of Tool–Sheet Interaction on Damage Evolution in Electromagnetic Forming of Aluminum Alloy Sheet

Journal of Engineering Materials and Technology ◽

10.1115/1.1839212 ◽

2005 ◽

Vol 127 (1) ◽

pp. 145-153 ◽

Cited By ~ 96

Author(s):

J. M. Imbert ◽

S. L. Winkler ◽

M. J. Worswick ◽

D. A. Oliveira ◽

S. Golovashchenko

Keyword(s):

Damage Evolution ◽

Numerical Study ◽

Forming Limit Diagram ◽

Alloy Sheet ◽

Electromagnetic Forming ◽

Free Form ◽

Forming Limit ◽

Metallographic Analysis ◽

Narrow Region ◽

Conical Die

A study of the effect of tool–sheet interaction on damage evolution in electromagnetic forming is presented. Free form and conical die experiments were carried out on 1 mm AA5754 sheet. Safe strains beyond the conventional forming limit diagram (FLD) were observed in a narrow region in the free form experiments, and over a significant region of the part in the conical die experiments. A parametric numerical study was undertaken, that showed that tool–sheet interaction had a significant effect on damage evolution. Metallographic analysis was carried out to quantify damage in the parts and to confirm the numerical results.

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