scholarly journals PERANCANGAN ALAT PELEPAS PIN GUIDE VANE PADA MESIN FUJI VF-IRS 69054L1 DI PLTA IR. P.M NOOR

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Sobar Ihsan ◽  
Adliansyah , ◽  
Ahmadil Amin ◽  
Marlina Ayu Lestari
Keyword(s):  
Yield Strength ◽  
Guide Vane ◽  
Von Mises Stress ◽  
Strength Material ◽  
Von Mises

Dalam memproduksi energi lisrik, PLTA Ir P.M Noor melakukan pemeliharaan periodik yaitu 8.000 jam kerja (Annual Inspection), 20.000 jam kerja (General Inspection) dan 40.000 jam kerja (Major Inspection). Dalam Pelaksanaan Pemeliharaan Periodik Major Inspection, PLTA Ir P.M Noor diharuskan melakukan pekerjaan sesuai dengan jadwal dan target yang telah ditetapkan oleh Unit Pelaksana Pengendalian Pembangkit Barito. Dalam pelaksanaan Major Inspection dilakukan pelepasan seluruh komponen pada turbin, termasuk pada guide vane. Untuk melepaskan guide vane diperlukan pelepasan komponen-komponen yang mendukungnya antara lain pin guide vane, arm, dan bushing. Pelaksanaan pelepasan pin guide vane yang berupa baja besi cukup susah untuk dilepaskan dikarenakan bentuk pin guide vane yang sedemikian rupa yaitu vertikal dengan guide vane sehingga menyebabkan permasalahan timbul ketika melepaskannya dari rangkaian pendukung guide vane. Permasalahan lain yang muncul yaitu saat jumlah pin guide vane yang berjumlah 20 buah (jumlah guide vane 20 buah), sehingga membutuhkan waktu yang cukup lama (±2 hari), waktu yang lama ini akan mempengaruhi pekerjaan pelepasan komponen lainnya, sehingga akan menyebabkan resiko keterlambatan dalam penyelesaian pelaksanaan Major Inspection. Pada penelitian hasil perhitungan batas minimum von mises 0.00000478 MPa dan maksimum 245.413 MPa dan nilai von mises stress masih dibawah dari nilai yield strength material yaitu 245.413 MPa. Sedangkan manfaat secara finansial dapat mempercepat pelaksanaan Major Inspection yang dalam pelaksanaan pekerjaan melepas pin guide vane memerlukan waktu ±2 hari, dapat dilakukan dalam ± 3 jam saja.

scholarly journals Analisis Kekuatan Struktur pada Gerbong Datar

MESIN ◽  
2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Teddy Andreas ◽  
Tono Sukarnoto ◽  
Soeharsono Soeharsono
Keyword(s):  
Yield Strength ◽  
Load Capacity ◽  
Maximum Load ◽  
Von Mises Stress ◽  
Total Deformation ◽  
Analysis Process ◽  
Safe Area ◽  
Original Size ◽  
Von Mises ◽  
Bottom Frame

<p><em>The PPCW railroad flatcars is railroad flatcars used to transport container loads with a maximum load capacity of up to 42 tons. In its use, these railroad flatcars are used to transport the cement bags in the pallet arrangement resulting in crack in the bottom frame of the PPCW railroad flatcars structure. The purpose of this analysis is to find out stress value and deformation value that occurred in the railroad flatcars due to the cement bags loading. The analysis process begins with modeling according to the original size of the railroad flatcars which is then followed by providing the support, gravity, loads, and material specifications used. Based on the result of analysis that has been obtained from the load of cement bags of 546,000 N and ratchet lashing of 900,000 N on the frame of PPCW railroad flatcars, we obtained the maximum von Mises stress value of 231.91 MPa arising on the bottom frame of the PPCW railroad flatcars structure as the site of cracking and the maximum total deformation value of 19.526 mm arising in the center of the railroad flatcars. The PPCW railroad flatcars made from SS400 with yield strength value of 245 MPa. Therefore, it was found that the value of stress arising in the railroad flatcars is still in the safe area and is allowed</em><em>.</em><em></em></p>

scholarly journals Mixing Chamber for Preparation of Nanorefrigerant

2020 ◽  
Vol 21 (1) ◽  
pp. 32-40
Author(s):  
Nur Fazlin Che Halim ◽  
Nor Azwadi Che Sidik
Keyword(s):  
Heat Transfer ◽  
High Pressure ◽  
Structural Analysis ◽  
Yield Strength ◽  
Wall Thickness ◽  
Von Mises Stress ◽  
Chamber Design ◽  
Mixing Chamber ◽  
Von Mises ◽  
Material Mixing

The last decade has seen the rapid advancement of nanofluid in several ways. Nanofluid based on the refrigerant have been introduced as nanorefrigerant in recent years due to their significant effects on the efficiency of heat transfer. Previous studies showed some limitation in ways of dispersing nanoparticles into refrigerant. Hence, a new idea of adding nanoparticles into refrigerant has been presented. A mixing chamber has been designed to mix nanoparticles into high pressure refrigerant. The mixing chamber design is drawn with five different wall thickness which are 2 mm, 4 mm, 6 mm, 8 mm and 10 mm to investigate the sturdiest design that can withstand high pressure. Static structural analysis is performed to all designs with different wall thickness on SolidWorks Simulation. The maximum values of von Misses stress and displacement has been presented in this paper. Validation of the results are made by comparing the maximum values of von Mises stress with yield strength of the material. Mixing chamber with wall thickness of 10 mm showed the best results.

An Inverse Approach to the Validation of Pressure Predictions in Rough Elastohydrodynamic Contacts

2001 ◽  
Vol 124 (1) ◽  
pp. 103-108 ◽  
Author(s):  
C. J. Hooke ◽  
K. Y. Li
Keyword(s):  
Residual Stress ◽  
Yield Strength ◽  
Rough Surface ◽  
Experimental Technique ◽  
Von Mises Stress ◽  
Stress Distributions ◽  
Inverse Approach ◽  
Controlled Conditions ◽  
Steel Disc ◽  
Von Mises

A simple experimental technique is developed that allows the pressures and stresses predicted by EHL analyses to be checked. A soft, rough steel disc is run, under controlled conditions, against a harder, smooth counterface. The pressures generated cause the soft disc to plastically deform. Once deformation ceases the residual profile may be measured and used as input to an EHL solver. The calculated pressures are then used to determine the stress distributions as the rough surface passes through the conjunction. After allowing for the build up of residual stress the maximum von Mises’ stress should be equal to the yield strength of the disc. This provides an accurate, quantitative check on the theoretical values.

Comparison of Stresses in Four Modular Total Knee Arthroplasty Prosthesis Designs

2016 ◽  
Vol 5 (2) ◽  
pp. 1-16
Author(s):  
Ahilan Anantha Krishnan ◽  
Rupesh Ghyar ◽  
Bhallamudi Ravi
Keyword(s):  
Yield Strength ◽  
Mechanical Performance ◽  
Three Dimensional ◽  
Compressive Load ◽  
Von Mises Stress ◽  
Dimensional Finite Element ◽  
Tibial Insert ◽  
Modular Prostheses ◽  
Von Mises ◽  
Three Dimensional Finite Element

The current study, compares the mechanical performance of four modular TKA prostheses based on von Mises stress distribution in the tibial insert. Three-dimensional finite element (FE) models of a cruciate retaining type modular prosthesis and three posterior stabilized (PS) type modular prostheses namely: anterior slide, modular post and double cam, were developed. A compressive load of 2600 N was applied to the FE models at flexion angles of 00, 150, 300, 600 and 900. Von Mises stress was evaluated on all the modular parts of the prostheses and compared with the yield strength of the corresponding material. Von Mises stress in all the parts were below the yield strength of their corresponding material except for tibial insert of anterior slide design at high flexion angle. Von Mises stress above the yield strength in the tibial insert of anterior slide design, was due to edge loading in the post and it demonstrates the likelihood of mechanical failure by delamination type of wear.

Structural Integrity of Serrated Leading Edge Guide Vane Blades for Noise Reduction

2021 ◽  
Author(s):  
Cleopatra Cuciumita ◽  
Ning Qin ◽  
Felix Stanley ◽  
Shahrokh Shahpar
Keyword(s):  
Passive Control ◽  
Structural Integrity ◽  
Guide Vane ◽  
Wave Length ◽  
Leading Edge ◽  
Von Mises Stress ◽  
Original Position ◽  
Structural Behaviour ◽  
Guide Vanes ◽  
Von Mises

Abstract One of the major noise sources of high bypass ratios modern turbofan engines arises from the interaction between the turbulent rotor wake, the tip-leakage and the leading edge of the downstream outlet guide vanes. Recent research has confirmed that leading edge serrations are an effective passive control for reducing noise. However, for transferring serrated leading edges to modern, environmentally friendly aero engines, the bypass outlet guide vanes must fulfil both aerodynamic and structural requirements. The current study aims at characterizing the structural behaviour when adding serrations to the leading edge of bypass outlet guide vanes designed for a configuration without classical struts. It was found that the structural performances deteriorate with increasing number of serrations, directly related to the serrations wavelength, and with their amplitude. The buckling loading factor decreases and the total deformation increases constantly with the increase of both parameters. The presence of the troughs of the serrations introduce stress concentrators. For large enough values of either the wave length or amplitude of the serrations, the maximum von Mises stress increases significantly, and can as much as double in value. At the same time, the location of the maximum stress on the vane moves from its original position, on the leading edge of the casing fillet, to the troughs of the serrations.

DESAIN DAN ANALISIS KEKUATAN TANGKI FIRE WATER STORAGE TANK TIPE FIX CONE ROOF KAPASITAS 1500 KL DENGAN PERHITUNGAN AKTUAL DAN SIMULASI SOFTWARE

2021 ◽  
Vol 26 (1) ◽  
pp. 69-78
Author(s):  
Aji Abdillah Kharisma ◽  
Ahmad Fadel Givari ◽  
Irvan Septyan Mulyana
Keyword(s):  
Yield Strength ◽  
Internal Pressure ◽  
Safety Factor ◽  
Storage Tank ◽  
Water Storage ◽  
Von Mises Stress ◽  
Data Input ◽  
Simulation Data ◽  
Water Storage Tank ◽  
Von Mises

Storage tank adalah alat yang dibutuhkan dalam industri minyak bumi dan gas. Fungsi dari storage tank ialah untuk menyimpan fluida dalam jumlah yang besar. Tangki timbun harus memiliki dinding yang kuat untuk menahan suatu tekanan, maka tangki tersebut tidak mengalami kerusakan. Penelitian ini membahas tentang kekuatan desain fire water storage tank, dari kriteria faktor keamanan, von misses, dan displacement. Metode yang digunakan adalah metode perhitungan actual dan metode analysis simulasi (analysis simulation). Data input desain shell diberi internal pressure sebesar (1 atm) atau (0,101325 MPa), pada hasil simulasi solidworks didapatkan nilai dari von mises stress sebesar (150,49 MPa), safety factor (1,36), dan displacement (5,95 mm). Hasil metode perhitungan aktual didapatkan nilai von mises sebesar (155,245 MPa), safety factor (1,32), dan displacement (4,274 mm). Berdasarkan hasil analisa desain dari storage tank dapat dinyatakan aman digunakan dikarenakan nilai von mises berada dibawah nilai yield strength (205 MPa), safety factor berada pada kisaran (1-10), serta displacement yang tidak terlalu signifikan.

An Innovative Yield Criterion Considering Strain Rates Based on Von Mises Stress

2019 ◽  
Vol 142 (1) ◽  
Author(s):  
Jingwei Yu ◽  
Qingguo Fei ◽  
Peiwei Zhang ◽  
Yanbin Li ◽  
Dahai Zhang ◽  
...  
Keyword(s):  
Energy Density ◽  
Yield Strength ◽  
Constitutive Model ◽  
Strain Rate ◽  
Dynamic Load ◽  
Strain Energy Density ◽  
Strain Energy ◽  
Yield Criterion ◽  
Von Mises Stress ◽  
Von Mises

Abstract An innovative yield criterion based on von Mises stress is proposed to represent the strain rate-dependent behavior under dynamic load. Considering the strain rate in the constitutive model, the distortional strain energy density is derived and the yield criterion is established. A plot of yield strength for a range of strain rate reveals that despite the differences in material properties and test methods, the yield strength rise can be represented by a unified criterion. The overall yield behavior of the material under dynamic load can be explained by introducing the strain rate into the constitutive model and threshold distortional strain energy density. This criterion is in a simple form that may be widely applied.

scholarly journals Stress Analysis on Tubesheet Referring to TEMA Standard

2021 ◽  
Vol 5 (1) ◽  
pp. 52-57
Author(s):  
Krisdiyanto Krisdiyanto ◽  
Muhamad Naufal Fikri ◽  
Rahmad Kuncoro Adi ◽  
Ahmad Restian Adi Nugroho
Keyword(s):  
Mass Transfer ◽  
Finite Element ◽  
Heat Exchanger ◽  
Yield Strength ◽  
Stress Analysis ◽  
Von Mises Stress ◽  
Tube Sheet ◽  
Manufacturer Association ◽  
Von Mises ◽  
Research Show

A heat exchanger is a device used to transfer heat without mass transfer. The equipment must be designed according to established standards. The standard that is widely used is the standardissued by TEMA (Tubular Exchanger Manufacturer Association). The results of the design of theheat exchanger with these standards are considered less efficient in terms of the material. Theefficiency of the material used can be analyzed by stress analysis on the components that withstand the force, and one of these components is the tube sheet. Stress analysis on tube sheets can use finite element-based software. The results of the research show that the tube sheet design that refers to the TEMA standard is relatively safe because the maximum von Mises stress is below the yield strength of the material used, while the overdesign value is rather significant because the average von Mises stress is also far below the yield strength of the material used.

scholarly journals Contact Yield Initiation and Its Influence on Rolling Contact Fatigue of Case-Hardened Steels

2020 ◽  
Vol 142 (12) ◽  
Author(s):  
Donglong Li ◽  
Mengqi Zhang ◽  
Lechun Xie ◽  
Zhanjiang Wang ◽  
Zhongrong Zhou ◽  
...  
Keyword(s):  
Yield Strength ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Von Mises Stress ◽  
External Loading ◽  
Material Strength ◽  
Case Hardening ◽  
Hardened Steels ◽  
Von Mises

Abstract Stress distributions and plastic deformation zones are factors directly influencing the fatigue life of components under cyclic contact. An effective approach to improving the resistance of a steel to contact fatigue failure is surface hardening, which builds gradient yield strength from the surface of the steel to the bulk. When using the distortion energy theory as the criterion to identify failure initiation for a case-hardened steel, contact yield starts in the subsurface wherever the von Mises stress reaches the local material strength, rather than at the point of the maximum von Mises stress in the subsurface. If the yield strength changes from the surface to the bulk following a straight line, the location of yield initiation should occur at the tangency of the strength line and the von Mises stress curve. Analyses on circular, rectangular, and elliptical contacts are presented to reveal the locations of contact yield initiation for such case-hardened steels subjected to rolling contact stresses, for which the influence of friction can be ignored. A group of formulas relating contact yield initiation, in terms of the critical pressure, location of the first yield, and plasticity index (transition to plasticity) to case-hardening parameters, such as the case slope, the minimum case depth, and surface and bulk strengths, are derived to facilitate contact element designs using case-hardened materials. The results are applied to examine the rolling contact behaviors of several case-hardened steels, and the data correlation suggests that their rolling contact fatigue lives are related to a nondimensional case-hardening slope besides external loading.

Determination of Pipeline Yielding Occurred in Hydrostatic Pressure Testing

2019 ◽  
Author(s):  
Xian-Kui Zhu
Keyword(s):  
Hydrostatic Pressure ◽  
Yield Strength ◽  
Yield Criterion ◽  
Limit Load ◽  
Von Mises Stress ◽  
Classical Solutions ◽  
Line Pipe ◽  
Pressure Testing ◽  
Offset Yield Strength ◽  
Von Mises

Abstract The pipeline industry has traditionally utilized the “double stroke” concept to define line pipe yielding for limiting plastic deformation of the pipeline during hydrostatic pressure testing. Practice showed that double stroke may define a nominal yield point lying between the elastic limit and the offset yield strength. Recently, a set of field hydrostatic tests were conducted on an X70 pipeline at Enterprise Products, and the test pressure at double stroke was as high as 129% of SMYS, but the von Mises stress was less than the actual yield strength. The entire pipeline was thought in the elastic conditions at double stroke during the hydrostatic testing. It is well recognized that the classical Tresca and von Mises yield criteria determines a lower and an upper bound of the limit load at yielding, and a newly proposed Zhu-Leis yield criterion determines a medium result of the two classical solutions. Extensive full-scale tests have confirmed that the Zhu-Leis yield solution is the best prediction of experimental data on average. This paper attempts to use the more accurate Zhu-Leis yield criterion to reanalyze the real-world hydrostatic tests of the X70 pipeline to see if pipe yielding occurs and to determine pipe diameter expansion at double stroke during the hydrostatic pressure testing.

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