Stress analysis of diesel-engine cylinder heads

Bertodo, R.; Carter, T J

doi:10.1243/03093247v061001

Cited by 11 publications

(4 citation statements)

References 2 publications

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“…The peak firing pressure, which is generated by combustion pressure, can reach values up to 200 bar in diesel engines. 5,16–18 In a start–stop cycle, the engine is warmed up to over 523 K, with a strong temperature gradient being created during operation between the water cooled flame deck (from 373 to 393 K) and the combustion chamber face (from 523 to 573 K). The constraint imposed on thermal expansion creates the most significant operating stresses at the critical flame-face sections of the cylinder head (e.g.…”

Section: Thermomechanical Fatiguementioning

confidence: 99%

“…The thermal load affects the fatigue lifetime to a far greater extent than the other two loads mentioned. 18–20…”

Section: Thermomechanical Fatiguementioning

confidence: 99%

“…The peak firing pressure, which is generated by combustion pressure, can reach values up to 200 bar in diesel engines. 5,[16][17][18] In a start-stop 1 a Out-of-phase and b in-phase thermo mechanical loading 1 2 Active damaging mechanisms during an OP TMF cycle 1,8,9 a copyright ß 2006 SAE International; reprinted with permission 13 b Reprinted with permission from American Foundry Society, 12 3 Photographs of a typical crack initiation area in the cylinder head cycle, the engine is warmed up to over 523 K, with a strong temperature gradient being created during operation between the water cooled flame deck (from 373 to 393 K) and the combustion chamber face (from 523 to 573 K). The constraint imposed on thermal expansion creates the most significant operating stresses at the critical flame-face sections of the cylinder head (e.g.…”

Section: Thermomechanical Fatiguementioning

confidence: 99%

“…The thermal load affects the fatigue lifetime to a far greater extent than the other two loads mentioned. [18][19][20] Figure 4 illustrates the calculated hoop strain-hoop stress for the first through third hot-cold cycle in the valve bridge area of a cylinder head. At the beginning, assembly loading generates a tensile hoop stress.…”

Section: Thermomechanical Fatiguementioning

confidence: 99%

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Application of cast Al–Si alloys in internal combustion engine components

Javidani

Larouche

2014

International Materials Reviews

308

112

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Excellent thermal conductivity and lower density make Al-Si alloys a suitable alternative for cast iron in the fabrication of engine components. The increase in the maximum operation temperature and pressure of engines necessitates improving the thermomechanical fatigue performance of Al-Si alloys. This paper has two major parts focussing on the use of Al-Si based alloys in cylinder heads and engine blocks. In the first part, the structural stress-strain and material property requirements of cylinder heads are discussed. In addition, the physical and mechanical properties of different competing materials used in the manufacture of engine components are reviewed. The physical metallurgy, solidification sequence and thermal conductivity of Al-Si based alloys are reviewed. Also discussed is the effect of microstructural features on thermomechanical fatigue lifetime. This part also includes an overview of the strengthening mechanisms of cast Al-Si alloys, by dispersed phases and heat treatment. Demands to improve fuel economy and reduce emissions necessitate modifications in the materials and design of engine blocks. Wear resistance and low friction coefficient are the major characteristics required for engine block materials. In the second part, the most promising alternative approaches to manufacturing liner-less Al-Si alloy cylinder blocks are elaborated.

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Section: Thermomechanical Fatiguementioning

confidence: 99%

“…The thermal load affects the fatigue lifetime to a far greater extent than the other two loads mentioned. 18–20…”

Section: Thermomechanical Fatiguementioning

confidence: 99%

Section: Thermomechanical Fatiguementioning

confidence: 99%

Section: Thermomechanical Fatiguementioning

confidence: 99%

See 2 more Smart Citations

Application of cast Al–Si alloys in internal combustion engine components

Javidani

Larouche

2014

International Materials Reviews

308

112

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Computer-aided design of thermally loaded axi-symmetric diesel engine components

Tomlinson

Leonard

Henshall

1974

Computer-Aided Design

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Optimization of Wet Cylinder Liner Designs for High Thermal Loadings

Bertodo¹,

Razdan²

1972

Proceedings of the Institution of Mechanical Engineers

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The paper outlines the optimization of wet cylinder liner designs for high thermal loads, with special reference to medium speed diesel engine applications in the bore range 180–500 mm (∼ 7–20 in). It is shown that a flake graphite nickel–copper–molybdenum alloyed cast iron with a well developed vanadium matrix combines the best properties for liner manufacture. For quality control reasons, centrifugal castings are often preferred, although the resultant graphite form is unfavourable for thermal stress resistance. Consequently, recourse to plain steels is sometimes required, leading naturally to the adoption of chromed finishes for wear and corrosion resistance. For a given thermal rating, the thermal stresses can be reduced by a judicious choice of air–fuel ratio, but a limiting value exists beyond which the thermal stresses remain unaffected. Reductions in stress level are also possible by optimizing the wall thickness and coolant flow. This leads inevitably to thin sections susceptible to distortion under firing and impact loads, thus impairing both the strength of the component and its wear properties. A planned degree of restraint can be adopted to control both distortion and stress level; such measures are not always conducive to economic design and serviceability, and may actually degrade the reliability when applied to steel liners. The surrounding structure can have a first order effect on the stress levels in the liner; these manifest themselves as applied loads to the liner supports or flange. The design details are thus important, and the influence of parameters such as bolting load, location of sealing spigot and block deflection are discussed in relation to the evolution of successful designs. Any structurally sound design must be capable of operating for periods of 20 000 h or more without excessive wear. It is shown that the wear process is essentially exponential; the factors affecting its absolute value are discussed, and attempts made to quantify their contribution.

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Stress analysis of diesel-engine cylinder heads

Cited by 11 publications

References 2 publications

Application of cast Al–Si alloys in internal combustion engine components

Application of cast Al–Si alloys in internal combustion engine components

Computer-aided design of thermally loaded axi-symmetric diesel engine components

Optimization of Wet Cylinder Liner Designs for High Thermal Loadings

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