Mechanical Stability Investigation of Advanced Composite Plates Resting on Elastic Foundations Using a New Four-Unknown Refined Theory

A refined and simple shear deformation theory for mechanical buckling of composite plate resting on two-parameter Pasternak’s foundations is developed. The displacement field is chosen based on assumptions that the in-plane and transverse displacements consist of bending and shear components, and the shear components of in-plane displacements give rise to the parabolic variation of shear strain through the thickness in such a way that shear stresses vanish on the plate surfaces.Therefore, there is no need to use shear correction factor. The number of independent unknowns of present theory is four, as against five in other shear deformation theories.It is assumed that the warping of the cross sections generated by transverse shear is presented by a hyperbolic function. The stability equations are determined using the present theory and based on the existence of material symmetry with respect to the median plane.The nonlinear strain-displacement of Von Karman relations are also taken into consideration. .The boundary conditions for the plate are assumed to be simply supported in all edges. Closed-form solutions are presented to calculate the critical load of mecanical buckling, which are useful for engineers in design. The effects of the foundation parameters,side-to-thickness ratio and modulus ratio, the isotropic and orthotropic square plates are considered in this analysis.are presented comprehensively for the mechanical buckling of rectangular composite plates

Mechanical stability investigation of advanced composite plates resting on elastic foundations using a new four-unknown refined theory

A refined and simple shear deformation theory for mechanical buckling of composite plate resting on two-parameter Pasternak钒s foundations is developed. The displacement field is chosen based on assumptions that the in-plane and transverse displacements consist of bending and shear components, and the shear components of in-plane displacements give rise to the parabolic variation of shear strain through the thickness in such a way that shear stresses vanish on the plate surfaces.Therefore, there is no need to use shear correction factor. The number of independent unknowns of present theory is four, as against five in other shear deformation theories.It is assumed that the warping of the cross sections generated by transverse shear is presented by a hyperbolic function. The stability equations are determined using the present theory and based on the existence of material symmetry with respect to the median plane.The nonlinear strain-displacement of Von Karman relations are also taken into consideration. The boundary conditions for the plate are assumed to be simply supported in all edges. Closed-form solutions are presented to calculate the critical load of mechanical buckling, which are useful for engineers in design. The effects of the foundation parameters, side-to-thickness ratio and modulus ratio, the isotropic and orthotropic square plates are presented comprehensively for the mechanical buckling of rectangular composite plate

Physical and mechanical behaviour of recycled concrete under destructive and non-destructive testing

Aggregates recycled from construction sites may exhibit slightly inferior characteristics compared to natural aggregates in terms of porosity, friability, and variability. However, it must be acknowledged that although recycled aggregates are currently used only in small proportions for manufacturing concrete, their usage is steadily increasing. It is now widely recognised that the reuse of recycled aggregates in mortar and concrete significantly contributes to the preservation of alluvial aggregates. The valorisation of recycled aggregates in concrete and mortar offers a clear economic advantage in the construction sector. Indeed, the reuse of materials from demolition could be envisaged directly on site or at construction waste recycling and treatment platforms. Additionally, it should be noted that to date, there is no specific standard for measuring the water absorption of recycled aggregates. Regarding the physical properties, the estimation of the absorption kinetics of the recycled aggregates has proved necessary. Moreover, other equally important measurements must be undertaken to determine all the other properties. The results obtained demonstrated that a good correlation exists between the substitution rate and the physical and mechanical properties of the prepared concrete. Furthermore, it was decided to vary the substitution rate of natural sand with recycled sand during the manufacture of concrete according to the following percentages: 25% recycled sand with 75% natural sand, and 50% recycled sand with 50% natural sand

Finite Element Analysis of Interactions of between two cracks in FGM notched Plate under Mechanical Loading

The investigation of multiple crack interactions in fracture mechanics is important to predict the safety and reliability of structures. This paper introduces a numerical investigation used to calculate the J-integral of the main crack behaviour emanating from a semicircular notch and double semicircular notch and its interaction with another crack which may occur in various positions in (TiB/Ti) FGM plate subjected to tensile mechanical load. Young’s modulus of the functionally graded material plate varies along the specimen width (notch radius direction r-FGM) with exponential-law (E-FGM) function. Further, the Poisson’s ratio is taken as a constant in normal direction.  For this purpose the variations of the material properties are applied at the integration points and at the nodes by implementing a subroutine USDFLD in the ABAQUS software.  The variation of the J-integral according to the position, the length, and the angle of rotation of cracks is demonstrated. The variation of the J-integral according to the position, the length, and the angle of rotation of cracks are examined; also the effect of different parameters for double notch FGM plate is investigated as well as the effect of band of FGM within the ceramic plate to reduce J-integral. According to the numerical analysis, all parameters above played an important role in determining the J-integral

Finite Element Analysis of Interactions between two cracks in FGM notched Plate under Mechanical Loading

The investigation of multiple crack interactions in fracture mechanics is important to predict the safety and reliability of structures. This paper introduces a 2D numerical investigation used to calculate the J-integral of the main crack behavior emanating from a semicircular notch and double semicircular notch and its interaction with another crack which may occur in various positions in titanium /titanium boride functionally graded material (TiB/Ti FGM) plate subjected to tensile mechanical load. Youngs modulus of the functionally graded material plate varies along the specimen width (notch radius direction r-FGM) with exponential-law (E-FGM) function. Further, the Poisson蒒s ratio is taken as a constant in normal direction. For this purpose the variations of the material properties are applied at the integration points and at the nodes by implementing a subroutine USDFLD in the ABAQUS software. The variation of the J-integral according to the position, the length, and the angle of rotation of cracks are examined; also the effect of different parameters for double notch FGM plate is investigated as well as the effect of band of FGM within the ceramic plate to reduce J-integral. According to the numerical analysis, all parameters above played an important role in determining the J-integral

A new design of square paralelipedic treatment chamber for food processing using pulsed electric field

Today, the influence of pulsed electric field is one of the key components in the PEF treatment process. The manuscript focused on the design and development of new multiple square paralelipedic PEF treatment chamber (TC2) which houses several electrodes, and testing the efficacy of this chamber on beet juice extraction compared with a single square paralelipedic treatment chamber (TC1) which houses only two electrodes. The aim of this paper to mention the effect of the Electric Field distribution based on Response Surface Modeling (RSM) for identifying the set point of the juice extraction process using pulsed electric field pre-treatment using a laboratory experimental bench. Obtained results show that the TC2 of PEF treatment has significant effect not only in juice yield, but also for enhancement of the betanin concentration and saving in consumed energy. Cite as: Bellebna A., Ramdani N., Khalfi Y., Tilmatine A.,  A new design of square paralelipedic treatment chamber for food processing using pulsed electric field. Alg. J. Eng. Tech. 2021, 4:45-53. http://dx.doi.org/10.5281/zenodo.4606697 References Amina Zelmat,Hocine Hadi,Malek Amiali,Tanya Gashovska and Amar Tilmatine, Determination and analysis of the electrical components of a PEF treated equivalent circuit of potato tissue. Int J Environ Stud, 2017, 74(2), 262-274. https://doi.org/10.1080/00207233.2016.1261600. Gharibi, T. M.; Elhamirad, A.H.; Azarpazhooh, E.; Pedramnia, A.; Sharayei,  P., Natural valuable compound extraction from onion by-products using a pulsed electric field, Inter J Biol Chem, 2019, 12(1), 171–180. https://doi.org/10.1093/benz/9780199773787.article.b00077852. Yashwant Kumar, Krishna Kumar Patel and Vivek Kumar, Pulsed Electric Field Processing in Food Technology, j. eng. stud. tech. approach, 2015, 1(2), 6-17. https://doi.org/10.3923/ajft.2012.506.516. K.; Sujka. M.; Pankiewicz. U.; Kowalski. R.; The application of PEF technology in food processing and human nutrition, J Food Sci Technol, 2020, 58(2):397–411. https://doi.org/10.1007/s13197-020-04512-4 R.M.; Zeng. X Han. Z.; Sahar. A.; Khalil. A.A.; Rahman. U; Khan. M; Mehmood. T., Combined effects of pulsed electric field and ultrasound on bioactive compounds and microbial quality of grapefruit juice, J Food Proc Pres, 2018, 42 (2) 135–150. https://doi.org/10.1111/jfpp.13507. R.A.H.; MastwijkabL. H.C.; Berendsena. B.J.M.; Nederhoffa. A.L.; Matsera. A.M.; Van Boekelc. M.A.J.S.; Nierop Groota. M.N., Moderate intensity Pulsed Electric Fields (PEF) as alternative mild preservation technology for fruit juiceEffects on the quality of orange juice and comparison with heat pasteurization. Interl J Food Micro, 2019, 298 (2) 63-73. https://doi.org/10.1016/j.ijfoodmicro.2019.02.015 Rodrigo, D.; Martínez, A.; Harte, F.; Barbosa-Cánovas, G.V.; Rodrigo, M, Study of inactivation of Lactobacillus plantarum in orange-carrot juice by means of pulsed electric fields: Comparison of inactivation kinetics models. J Food Prot, 2007, 64(2), 259–263. https://doi.org/10.4315/0362-028x-64.2.259. K.; Kopeć. A.; Dróżdż. T.; Kiełbasa. P.; Ostafin. M..; Bulski. K; Oziembłowski. M., Effect of pulsed electric field treatment on shelf life and nutritional value of apple juice, J Food Scie Techn, 2019, 56 (1) 1184–1191. https://doi.org/10.1007/s13197-019-03581-4 T.K, Ngadi. M.O and Raghavan. G.S.V, Pulsed electric field assisted juice extraction from alfalfa, Can. Biosyst. Eng, 2006, 48(3), 33-37. https://doi.org/10.1109/ppc.2013.6627488. A, and Vorobiev. E, Pulsed electric field assisted pressing of sugar beet slices: towards a novel process of cold juice extraction. Biosystems Eng, 2006, 93(1), 57- 68. https://doi.org/10.1016/j.biosystemseng.2005.09.008. T.; , Rems. L.;Tarek. M.; Miklavčič. D., Membrane Electroporation and Electropermeabilization: Mechanisms and Models, Annual Review of Biophysics, 2019, 48 (3) 63-91. https://doi.org/10.1146/annurev-biophys-052118-115451 M.S.; Šatkauskas. S., Mechanisms of transfer of bioactive molecules through the cell membrane by electroporation, European Biophysics Journal,2015, 44 (5) 277–289 https://doi.org/10.1016/s0006-3495(90)82348-1 K.; Munekata. E. S.P.; Parniakov. O.; Barba. F. J.; Witt. J.; Toepfl. S.; Wiktor. A.; Lorenzo. J. M., Pulsed electric field and mild heating for milk processing: a review on recent advances, J Sci Food Agri, 2020, 100(1), 16-24. https://doi.org/10.1002/jsfa.9942 Dascalescu, L, Samuila, A, Mihalcioiu. A, Bente. S. and Tilmatine. A, Robust design of electrostatic separation processes, IEEE T IND APPL, 2005, 41(3), 715–720. https://doi.org/10.1109/tia.2005.847308. Medles K, Tilmatine. A, Rezouga. M, M, Ramdani. Y,  Bendaoud. A, Experimental Designs Methodology And Its Application To An Electrostatic Separation Process, MATER TECHNOL: Advanced Performance Materials, 2006, 21(3), 144-147. https://doi.org/10.1179/mte.2006.21.3.144. A, Bendimerad. S, Younes. M and Dascalescu. L, Experimental analysis and optimization of a free-fall triboelectric separator of granular plastic particles, International Journal of Sustainable Engineering, 2009, 2(3), 184–191. https://doi.org/10.1080/19397030903134532. A and Dascalescu. L, Set‐point identification of a free‐fall triboelectrostatic separation process for plastic particles, Int J Environ Stud, 2010, 67(1), 27–40. https://doi.org/10.1080/00207230902883960. Yassine Bellebna,Rabah Ouiddir,Zouaoui Dey, Mohamed Miloudi & Amar Tilmatine, Robustness testing of the juice extraction process using a pulsed electrical field, Int J Environ Stud, 2014, 71(3), 360-371. https://doi.org/10.1080/00207233.2014.916495. MODDE 5.0, ‘‘User guide and tutorial’’, Umetrics (1999)

Métastase mandibulaire d’un carcinome folliculaire de la thyroïde : un cas rare après 7 ans

Introduction : Les métastases au niveau de la mandibule ne représentent que 1 % des tumeurs malignes de la cavité buccale. Observation : Nous rapportons le cas d’un patient opéré il y a 7 ans pour un carcinome folliculaire de la thyroïde et qui présentait une tumeur mandibulaire localisée sans métastases à distance. Une exérèse de la tumeur mandibulaire avec reconstruction a été réalisée. L’histologie révélait une métastase mandibulaire d’un carcinome folliculaire de la thyroïde. L’évolution était favorable avec un recul de 17 mois. Conclusion : Bien que rares, les métastases mandibulaires de la thyroïde doivent être évoquées devant toute tumeur de la région buccale, car la détection et le traitement de ces lésions métastatiques à un stade précoce améliorent la survie des patients