scholarly journals The Strength of Egg Trays under Compression: A Numerical and Experimental Study

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2279
Author(s):  
Leszek Czechowski ◽  
Gabriela Kmita-Fudalej ◽  
Włodzimierz Szewczyk
Keyword(s):  
Finite Element Method ◽  
Experimental Study ◽  
Finite Element ◽  
Maximum Load ◽  
Experimental Investigations ◽  
Large Strains ◽  
Strength Ratio ◽  
The Finite Element Method ◽  
Compression Stiffness ◽  
Different Shapes

This work concerns the analysis of egg packages subjected to compression. Experimental investigations were carried out to determine the curves of compression and maximum loads. To compare packages accessible on the market, several different shapes of egg packages were tested after being conditioned in air with a relative humidity of 50%. Several paper structures in stock were compressed. By validating the experiment results, numerical computations based on the finite element method (FEM) were executed. The estimations of a numerical model were performed with the use of the perfect plasticity of paper and with the assumption of large strains and deflections. Our own two structures of egg packaging were taken into account: basic and modified. The material of the packages was composed of 90% recovered paper and 10% coconut fibres. This paper involved the numerical modelling of such complex packaging. Moreover, our research showed that introducing several features into the structures of the packaging can improve the stiffness and raise the maximum load. Thanks to the application of ribs and grooves, the strength ratio and compression stiffness, in comparison to the basic tray, increased by approximately 23.4% and 36%, respectively. Moreover, the obtained indexes of modified trays were higher than the majority of the studied market trays.

Research of throwing areols of underground pipeline in permafrost

2021 ◽  
pp. 21-30
Author(s):  
T. S. Sultanmagomedov ◽  
◽  
R. N. Bakhtizin ◽  
S. M. Sultanmagomedov ◽  
T. M. Halikov ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Experimental Study ◽  
Finite Element ◽  
Strain State ◽  
Operating Temperature ◽  
Operating Conditions ◽  
Loss Of Stability ◽  
Underground Pipeline ◽  
The Finite Element Method ◽  
Permafrost Thawing

Study is due to the possibility of loss of stability of the pipeline in the process of pumping a product with a positive operating temperature and the formation of thawing halos. The article presents the ways of solving the thermomechanical problem of pipeline displacement due to thawing. The rate of formation of a thawing halo is investigated depending on the initial temperatures of the soil and the pumped product. The developed monitoring system makes it possible to study the rate of occurrence of thawing halos in the process of pumping the product. An experimental study on the formation of thawing halos around the pipeline was carried out on an experimental model. A thermophysical comparative calculation of temperatures around the pipeline on a model by the finite element method has been carried out. Keywords: underground pipeline; permafrost; thawing halo; monitoring; operating conditions; stress–strain state.

Failure mechanisms in two-layer undrained slopes

2020 ◽  
Vol 57 (10) ◽  
pp. 1617-1621
Author(s):  
Shuangfeng Guo ◽  
D.V. Griffiths
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Failure Mechanism ◽  
Failure Mechanisms ◽  
Slope Angle ◽  
Strength Ratio ◽  
The Finite Element Method ◽  
Stability Analyses ◽  
Shallow Failure ◽  
Insight Into

This note presents results of stability analyses of two-layer undrained slopes by the finite element method. The study focuses on the circumstances under which either deep or shallow failure mechanisms occur, as a function of the strength ratio of the layers, slope angle, and foundation depth ratio. Improved knowledge of the location of the critical failure mechanism(s) in two-layer systems will give engineers better insight into where to focus their attention in terms or remediation or reinforcement to preserve stability.

scholarly journals ADHESIVES IN STRENGTHENING OF STEEL STRUCTURES

2010 ◽  
Vol 2 (2) ◽  
pp. 45-50 ◽  
Author(s):  
Hartmut Pasternak ◽  
Gabriel Kubieniec ◽  
Marek Piekarczyk
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Detailed Analysis ◽  
Steel Structures ◽  
Numerical Results ◽  
Numerical Calculations ◽  
Knee Joints ◽  
Experimental Investigations ◽  
The Finite Element Method ◽  
Box Girder

This study includes a detailed analysis of using adhesives in reinforcement of steel structures. Two types of structures were experimentally investigated: box girder and knee joints. The numerical calculations were done on the basis of the experimental investigations performed at CUT Cracow (box girder) and BTU Cottbus (knee joints) with the use of numerical programme Abaqus based on the Finite Element Method. The numerical results were compared with the experimental ones.

scholarly journals THE EFFECTS OF INTERBRACKET DISTANCE AND GABLE BENDS ON THE FORCE AND MOMENTS IN A SEGMENTED ARCH APPROACH: A NUMERICAL-EXPERIMENTAL STUDY

2018 ◽  
Vol 48 (1) ◽  
pp. 63-67
Author(s):  
M. A. FERREIRA ◽  
F. R.M. RODRIGUES ◽  
P. C. BORGES ◽  
M. A. LUERSEN
Keyword(s):  
Finite Element Method ◽  
Experimental Study ◽  
Finite Element ◽  
Statistical Difference ◽  
Von Mises Stress ◽  
The Finite Element Method ◽  
Force System ◽  
Space Closure ◽  
Von Mises ◽  
Deactivation Process

The present paper verified the effect of the interbracket distance on the force system developed by orthodontic retraction springs with two delta geometries measured during space closure when spaces between teeth are present. By using a platform transducer, five different interbracket distances were tested. Also the finite element method was applied to know the von Mises stress during spring activation/deactivation process. It was concluded that the interbracket distance and spring geometry variables have not caused significant influence on the force system resulting from activations, but activation has produced a statistical difference.

Research and analysis on the broadband dispersion tailoring of the sub-micro silicon-on-insulator waveguides

2017 ◽  
Vol 31 (06) ◽  
pp. 1750056
Author(s):  
Jin Wen ◽  
Wang Liu ◽  
Keyang Liu ◽  
Haiwei Fu ◽  
Zhenan Jia
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Nonlinear Optical ◽  
Silicon On Insulator ◽  
Geometrical Parameters ◽  
The Finite Element Method ◽  
Long Wavelength ◽  
Optical Effects ◽  
Nonlinear Optical Effects ◽  
Different Shapes

High-order dispersions of the silicon-on-insulator (SOI) waveguides with different shapes (including slab, ridge and slot) have been obtained and compared using the finite element method (FEM). Through adjusting the geometrical parameters of the waveguides, single or dual zero-dispersion wavelengths (ZDWs) can be tuned in the broadband wavelength range. Differences of dispersion curves among these waveguides are analyzed from the viewpoint of structure and mechanism in detail. It is remarkably shown the number of ZDWs can be varied from 0 to 2 and the position of the ZDWs can be tuned from 1400 nm to 1900 nm flexibly. Moreover, the differences of dispersion features in short and long wavelength regions are also discussed deeply. Due to the dispersion of SOI waveguides playing a dominated role in many nonlinear optical effects, this research can make some contribution for dispersion tailoring and nonlinear optics.

scholarly journals Modelling of the Guillotine Cutting Process by Means of a Symmetrical Blade with the Defined Geometry

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5404
Author(s):  
Jarosław Kaczmarczyk
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Cutting Tool ◽  
Cutting Process ◽  
Experimental Investigations ◽  
The Finite Element Method ◽  
Complex State ◽  
Highly Nonlinear ◽  
Cutting Processes ◽  
Element Method

This paper modelled the cutting process of a bundle consisted of ultra-thin cold-rolled steel sheets using a guillotine. The geometry of a cutting tool with given dimensions was assumed. A bundle of sheets being cut was modelled as deformable, the cutting tool was rigid, and the finite element method along with computer system LS-DYNA was employed. Numerical simulations of the complex state of stress and of the corresponding complex state of strain were carried out. Cutting processes belong to fast changing physical phenomena, and therefore, highly nonlinear dynamical algorithms were applied in order to solve this particular problem. Experimental investigations were also conducted by means of the scanning electron microscopy. It was found that the fracture region consisted of two distinct zones: brittle and ductile separated from each other by the interfacial transition. Morphological features of the brittle, ductile, and the transition regions were identified. The ductile and brittle zones were separated at the depth of ca. 1/5 thickness of the cut steel sheet. Finally, the numerical results obtained by usage of the finite element method as well as experimental ones in the form of microscopic images were compared, showing quite good agreement.

Analysis of Dilatancy Effect when Mortar Bolt Interface Destroying

2012 ◽  
Vol 446-449 ◽  
pp. 1641-1644
Author(s):  
Zhi Fei Song ◽  
Jia Hao Lei ◽  
Shi Guo Sun
Keyword(s):  
Finite Element Method ◽  
Experimental Study ◽  
Finite Element ◽  
Radial Pressure ◽  
The Body ◽  
The Finite Element Method ◽  
Bond Failure ◽  
Dilatancy Effect ◽  
Rock Interface ◽  
Concrete Matrix

The experimental study on the case of bond failure happening at the grout-rock interface about mortar bolt, the concrete matrix is sudden destroyed when loading specimen which grouting length 60mm, compared to previous research, it is reduced by dilatancy effect when mortar is pressed out of the body, this paper analyzes the concrete axial radial pressure when mortar is pressed out and the dilatancy effect using the finite element method.

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