Thermo-Mechanical Analysis of a Cast Iron Exhaust Manifold: a Comparison Between the Traditional and a New Methodology

2010 ◽  
Author(s):  
Cristiana Delprete ◽  
Carlo Rosso ◽  
Andrea Vercelli
Keyword(s):  
Cast Iron ◽  
Mechanical Analysis ◽  
Exhaust Manifold

Proposal of a new low-cycle fatigue life model for cast iron with room temperature calibration involving mean stress and high-temperature effects

2019 ◽  
Vol 233 (14) ◽  
pp. 5056-5073 ◽  
Author(s):  
Cristiana Delprete ◽  
Raffaella Sesana
Keyword(s):  
Finite Element ◽  
Cast Iron ◽  
High Temperature ◽  
Finite Element Model ◽  
Life Prediction ◽  
Low Cycle Fatigue ◽  
Element Model ◽  
Mean Stress ◽  
Exhaust Manifold ◽  
Cycle Fatigue

The paper presents and discusses a low-cycle fatigue life prediction energy-based model. The model was applied to a commercial cast iron automotive exhaust manifold. The total expended energy until fracture proposed by the Skelton model was modified by means of two coefficients which take into account of the effects of mean stress and/or mean strain, and the presence of high temperature. The model was calibrated by means of experimental tests developed on Fe–2.4C–4.6Si–0.7Mo–1.2Cr high-temperature-resistant ductile cast iron. The thermostructural transient analysis was developed on a finite element model built to overtake confidentiality industrial restrictions. In addition to the commercial exhaust manifold, the finite element model considers the bolts, the gasket, and a cylinder head simulacrum to consider the corresponding thermal and mechanical boundary conditions. The life assessment performance of the energy-based model with respect the cast iron specimens was compared with the corresponding Basquin–Manson–Coffin and Skelton models. The model prediction fits the experimental data with a good agreement, which is comparable with both the literature models and it shows a better fitting at high temperature. The life estimations computed with respect the exhaust manifold finite element model were compared with different multiaxial literature life models and literature data to evaluate the life prediction capability of the proposed energy-based model.

Modernization of exhaust manifolds of DG882L diesel-generator for diesel locomotives

2020 ◽  
pp. 68-71
Author(s):  
Dmitriy Sergeevich Shestakov ◽  
◽  
Dmitriy Andreevich Lashmanov ◽  
Keyword(s):  
Cast Iron ◽  
Diesel Engine ◽  
Temperature Distribution ◽  
Gas Dynamics ◽  
Exhaust Gas ◽  
Exhaust Manifold ◽  
Diesel Generator

The paper considers a serial design of a collapsible exhaust manifold for pulse boosting system of 8DM-21EL2M diesel engine and it’s modernized variant made of cast iron. The authors present results of modeling of exhaust gas and coolant flows gas dynamics. They also show the temperature distribution over the manifold surface.

Thermo-Fluid Analysis of the Exhaust Manifold Integrated With Cylinder Head

2012 ◽  
Author(s):  
Mohammad Amin Neshan ◽  
Ali Keshavarz ◽  
Ali Jazayeri ◽  
Ali Ghasemian
Keyword(s):  
Cast Iron ◽  
Thermal Resistance ◽  
Cylinder Head ◽  
Internal Combustion Engines ◽  
Low Cost ◽  
Combustion Engines ◽  
Exhaust Manifold ◽  
Warm Up ◽  
Fluid Analysis ◽  
Temperature Limitation

Exhaust manifold is an individual part of conventional internal combustion engines which is made of cast iron. Furthermore expensive alloys are needed to increase its thermal resistance. In the Integrated Exhaust Manifold into Cylinder Head (IEMCH), the exhaust manifold is manufactured as one part with the cylinder head. Thus its material changes from cast iron to aluminum which has a much lower thermal resistance than the cast iron. IEMCH has many advantages such as, low cost, lower weight and volume, less fuel consumption and faster warm-up. But due to its lower thermal resistance, it must be cooled. Here a new exhaust manifold is designed for IEMCH. Thermo-fluid analysis is carried out numerically to evaluate temperature limitation of the new exhaust manifold. The obtained results are compared to the standard exhaust manifold which indicates that by means of cooling, the new exhaust manifold can be remained at its proper temperature limitation. Thus no expensive alloys are needed in the new exhaust manifold.

The Study on Oxidation Resistance Properties of Ductile Cast Irons for Exhaust Manifold at High Temperatures

2010 ◽  
Vol 97-101 ◽  
pp. 530-533 ◽  
Author(s):  
Yun Long Yang ◽  
Zhan Yi Cao ◽  
Yang Qi ◽  
Yong Bing Liu
Keyword(s):  
Cast Iron ◽  
Oxidation Resistance ◽  
High Temperatures ◽  
Oxidation Behavior ◽  
Exhaust Manifold ◽  
Cast Irons ◽  
Comparison And Analysis ◽  
Better Than

The oxidation behavior of two ductile cast irons was investigated in this paper. The alloys were a high Si-Mo ductile and a ductile Ni-Resist cast iron which were developed by FAW Foundry. Polished sections were exposed at temperatures between 800 °C and 1000 °C, mostly for 80h. It has been found that the property of oxidation resistance of ductile Ni-Resist cast iron is excellent or better than that of high Si-Mo ductile by comparison and analysis.

scholarly journals STRUCTURAL, THERMAL AND THERMO-MECHANICAL ANALYSIS OF FOUR STROKE PETROL ENGINE PISTON USING CAE TOOLS

2020 ◽  
Vol 3 (1) ◽  
pp. 05-10
Author(s):  
S. Sathishkumar ◽  
Dr.M. Kannan
Keyword(s):  
Cast Iron ◽  
Stress Distribution ◽  
Material Properties ◽  
Poor Performance ◽  
Mechanical Analysis ◽  
Petrol Engine ◽  
Gas Temperature ◽  
Ic Engine ◽  
Engine Piston ◽  
Engine Condition

As we are known numerous reciprocating parts is contained in IC Engine which are responsible for giving the motion. The abnormal piston working is given poor performance in comparison of other parts. The main intention of this research is to investigate and analyse the stress distribution of automobile piston at definite engine Condition. In this paper pressure (Mechanical), thermal (Heat) and thermo-mechanical analysis is accomplished by help of CAE Tool. The constraint used for the analysis is pressure of operating gas, temperature and material properties of piston. In this research piston are designed for a single cylinder four stroke petrol engine using CATIA V5R20 and analysis is performed by ANSYS 14. Two different material are induced in this investigation. First one is Aluminium alloy and second is Cast Iron. In this end of the Results are shown and a comparison is made to find the most suited material for splendour automobile vehicle piston by various CAE analyses.

A Study on Microstructure of Ductile Ni-Resist Cast Iron for Exhaust Manifolds and Mechanical Property at the Condition of Altermative Thermal Cycles

2011 ◽  
Vol 194-196 ◽  
pp. 95-99 ◽  
Author(s):  
Yun Long Yang ◽  
Zhan Yi Cao ◽  
Zhen Song Lian ◽  
Hai Xia Yu
Keyword(s):  
Mechanical Property ◽  
Cast Iron ◽  
Main Part ◽  
Microstructure Characterization ◽  
Exhaust Manifold ◽  
Cast State ◽  
Thermal Cycles ◽  
Cast Condition

The kind of ductile Ni-resist cast iron which will be used to exploit the exhaust manifold in First Automotive Works mainly contains up to 29 wt% Nickel, 4.9 wt% silicon and 1.7 wt% chromium. The main part of this study focused on the microstructure characterization of the as-cast condition and mechanical property at the condition of alternative thermal cycles. In the cast state, the alloy consists of the austentic matrix and carbides. The carbides contain M6C and M7C3. And FeNi3phase is found in the austentic matrix. After alternative thermal cycles at 900 , the hardness value gradually descends from 203 HV to 170 HV.

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