Light metal materials

Fuchs, Heinrich; Wappelhorst, Michael

doi:10.1007/bf03227623

Cited by 4 publications

(2 citation statements)

References 1 publication

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“…In addition to aluminium cylinder heads being lighter, aluminium alloys in cylinder heads also offer the advantage of high thermal conductivity and increased corrosion resistance compared to their cast iron counterparts [1,2]. As the drive to advance the engine efficiency increases, the operating temperatures have kept increasing with the engine peak temperature reported well above 200 • C in recent times [3][4][5]. Cylinder heads undergo thermomechanical fatigue cycles associated with the engine start-stop cycle, leading to possible failure of thin sections in the cylinder heads that are exposed to steep thermal gradients such as the valve bridge area [3,6,7].…”

Section: Introductionmentioning

confidence: 99%

“…Copper additions have been used in recent years to improve the high-temperature strength and the creep properties of the A356 alloy [1, 13,14]. The A356 + 0.5 wt % Cu alloy is commonly used in recent generations of cylinder heads [3,4,15]. The alloy is often heat-treated to an over-aged condition (T7) to improve the microstructural and dimensional stability of the component.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Strain Rate on the Deformation Behaviour of A356-T7 Cast Aluminium Alloys at Elevated Temperatures

Natesan

Ahlström

Manchili

et al. 2020

Metals

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Internal combustion engine downsizing and powertrain electrification trends in recent years have led to higher thermal loads on the cylinder head materials with an increased number of engine start–stop thermal load cycles. This requires designing cylinder heads that are resilient against thermomechanical fatigue damage. To reduce the developmental costs, reliable numerical models for use in computer-aided design approaches are required. Thus, a comprehensive understanding of the material deformation behaviour under loads mimicking in-service conditions is desired to make better engineering decisions. This study examines the effect of strain rate on the cyclic deformation behaviour of the A356-T7 + 0.5% Cu aluminium alloy commonly used in modern internal combustion engine cylinder heads. Samples extracted from the valve bridge areas of the cylinder heads are tested in strain-controlled fatigue tests. Samples are tested at strain rates of 1% s−1 and 10% s−1 at room temperature, 150 and 200 °C. The material exhibits increased isotropic hardening and softening rates and an increased number of cycles to failure at 10% s−1. The strain rate has a dramatic influence on the mean stress development at room temperature. The role of silicon particles in the fracture mechanism is investigated using electron microscopy techniques.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Strain Rate on the Deformation Behaviour of A356-T7 Cast Aluminium Alloys at Elevated Temperatures

Natesan

Ahlström

Manchili

et al. 2020

Metals

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Effects of Temperature on the Evolution of Yield Surface and Stress Asymmetry in A356–T7 Cast Aluminium Alloy

et al. 2021

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As the electrification of vehicle powertrains takes prominence to meet stringent emission norms, parts of internal combustion engines like cylinder heads are subjected to an increased number of thermal load cycles. The cost-effective design of such structures subjected to cyclic thermo-mechanical loads relies on the development of accurate material models capable of describing the continuum deformation behaviour of the material. This study investigates the effect of temperature on the evolution of flow stress under cyclic loading in A356-T7 + 0.5% Cu cast aluminium alloy commonly used in modern internal combustion engine cylinder heads. The material exhibits peak stress and flow stress asymmetry with the stress response and flow stress of the material under compressive loading higher than under tension. This peak and flow stress asymmetry decrease with an increase in temperature. To compare this stress asymmetry against conventional steel, cyclic strain-controlled fatigue tests are run on fully pearlitic R260 railway steel material. To study the effect of mean strain on the cyclic mean stress evolution and fatigue behaviour of the alloy, tests with tensile and compressive mean strains of +0.2% and −0.2% are compared against fully reversed (Rε = −1) strain-controlled tests. The material exhibits greater stress asymmetry between the peak tensile and peak compressive stresses for the strain-controlled tests with a compressive mean strain than the tests with an identical magnitude tensile mean strain. The material exhibits mean stress relaxation at all temperatures. Reduced durability of the material is observed for the tests with tensile mean strains at lower test temperatures of up to 150 °C. The tensile mean strains at elevated temperatures do not exhibit such a detrimental effect on the endurance limit of the material.

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A Comparative Investigation on the High Temperature Fatigue of Three Cast Aluminum Alloys

Engler-Pinto

Lasecki

Boileau

et al. 2004

SAE Technical Paper Series

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Light metal materials

Cited by 4 publications

References 1 publication

Effect of Strain Rate on the Deformation Behaviour of A356-T7 Cast Aluminium Alloys at Elevated Temperatures

Effect of Strain Rate on the Deformation Behaviour of A356-T7 Cast Aluminium Alloys at Elevated Temperatures

Effects of Temperature on the Evolution of Yield Surface and Stress Asymmetry in A356–T7 Cast Aluminium Alloy

A Comparative Investigation on the High Temperature Fatigue of Three Cast Aluminum Alloys

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