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Experimental and Finite Element Analysis of Corroded High-Pressure Pipeline Repaired by Laminated Composite

Computer Modeling in Engineering & Sciences 2024年第8期140卷 1783-1806页

作者： Seyed Mohammad Reza Abtahi saeid ansari sadrabadi Gholam Hosein Rahimi Gaurav Singh Hamid Abyar Daniele Amato Luigi Federico Faculty of Mechanical Engineering Tarbiat Modares UniversityTehran***Iran A.Leon Linton Department of Mechanical Robotics and Industrial EngineeringLawrence Technological UniversitySouthfieldMI48075USA Department of Mechanical Engineering Faculty of EngineeringMeybod UniversityYazd***Iran Department of Industrial Engineering University of SalernoVia Giovanni PaoloⅡFiscianoItaly Italian Aerospace Research Center(C.I.R.A.) Via MaioriseCapuaCE81043Italy

Repairs of corroded high-pressure pipelines are essential for fluids transportation under high *** of the methods used in their repairs is the use of layered *** composite used must have the necessary ***,the experiments and analytical solutions presented in this paper are performed according to the relevant standards and codes,including ASME PCC-2,ASME B31.8S,ASME B31.4,ISO 24817 and ASME *** addition,the experimental tests are replicated numerically using the finite element *** the strain gauges at different distances from the defect location,can reduce the nonlinear effects,deformation,and fluctuations due to the high *** direct relationship between the depth of an axial defect and the stress concentration is observed at the inner side edges of the *** reparation reduces the non-linearities related to the sharp variation of the geometry and a more reliable numerical simulation could be performed.

关键词： High-pressure pipeline composite repair ASME PCC-2 ISO 24817

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Three-dimensional magneto-thermo-elastic analysis of functionally graded cylindrical shell

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Applied Mathematics and Mechanics(English Edition) 2017年第4期38卷 479-494页

作者： A. MEHDITABAR G.H. RAHIMI S. ansari sadrabadi Department of Mechanical Engineering School of Mechanical EngineeringTarbiat Modares UniversityTehran 14115-111Iran

The present paper presents the three-dimensional magneto-thermo-elastic analysis of the functionally graded cylindrical shell immersed in applied thermal and magnetic fields under non-uniform internal pressure. The inhomogeneity of the shell is assumed to vary along the radial direction according to a power law function, whereas Poisson＇s ratio is supposed to be constant through the thickness. The existing equations in terms of the displacement components, temperature, and magnetic parameters are derived, and then the effective differential quadrature method （DQM） is used to acquire the analytical solution. Based on the DQM, the governing heat differential equations and edge boundary conditions are transformed into algebraic equations, and discretized in the series form. The effects of the gradient index and rapid temperature on the displacement, stress components, temperature, and induced magnetic field are graphically illustrated. The fast convergence of the method is demonstrated and compared with the results obtained by the finite element method （FEM）.

关键词： magneto-thermo-elastic functionally graded material (FGM) cylindrical shell differential quadrature method (DQM)

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Detection of bacterial biofilm in uterine of repeat breeder dairy cows

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Asian pacific Journal of Reproduction 2017年第3期6卷 136-139页

作者： Mohammad Rahim Ahmadi Abdollah Derakhshandeh Sadegh Shirian Yahya Daneshbod Maryam ansari-Lari saeid Nazifi Departments of Clinical Sciences School of Veterinary MedicineShiraz UniversityShirazIran Departments of Pathobiology School of Veterinary MedicineShiraz UniversityShirazIran Department of Pathology School of Veterinary MedicineShahrekord UniversityShahrkordIran Shiraz Molecular Research Center Dr Daneshbod LabShirazIran Departments of Food Hygiene and Public Health School of Veterinary MedicineShiraz UniversityShirazIran

Objective:To determine the possibility of presence of bacterial biofilm in the uterus of repeat breeder cows and to evaluate the effect of mucolytic agent in cleanup of uterus from biofilm. Methods: Twenty repeat breeder cows were selected from a large commercial dairy farm near Shiraz, Fars province, southern Iran. Uterine secretion samples were collected before and after uterine lavage with dimethyl sulfoxide (DMSO) 10% solution and periodic acid Schiff (PAS) staining was used to detect bacterial biofilm in uterine samples. After sampling, all cows were treated with two doses of PGF2 and intrauterine infusion of Cefquinome sulphate. Artificial insemination (AI) was performed after ***: Bacterial biofilms were found in 12 out of 20 animals (60%) in the first sampling with sterile saline lavage (before DMSO) and in 7 cows (35%) after DMSO lavage. Fourteen cows (70%) became pregnant after AI. This evidence showed the presence of bacterial biofilm in the uterus of dairy cows for the first time. Although non-significant, decrease in biofilm detection after DMSO lavage may suggest the potential ability of mucolytic agent for cleaning the uterus from bacterial biofilm. Also, high pregnancy rate after antibiotic treatment in the present study might be attributed to improved effect of antibiotic following lavage of uterine by ***:These findings should be investigated in future researches with more sample size.

关键词： Bacterial biofilm Dairy cow Mucolytic agent Repeat breeder Uterine

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