Influences of strain rate on the low cycle fatigue behavior of gravity casting Al alloys

Fan, K.L.; Liu, X.S.; He, Guoqiu; Cheng, Hongbo; Zhang, Z.

doi:10.1016/j.matchar.2015.07.024

Cited by 18 publications

(12 citation statements)

References 20 publications

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“…Similar fracture morphology for AA 2124 alloy was presented by Hao et al Beach marks along with local brittle cracking (secondary cracks shown by arrow marks) during controlled crack progression (stage II) are shown in Figure D. Fan et al reported similar results for gravity casting Al‐Si‐Cu aluminium alloy. A transition from stage II to stage III is clearly visible in Figure E.…”

Section: Examination Of Fracture Surfaces By Semsupporting

confidence: 80%

Investigation of fatigue and fracture behaviour of sensitized marine grade aluminium alloy AA 5754

Kumar

Singh

2019

Fatigue Fract Eng Mat Struct

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In the present study, fatigue and fracture characteristics of sensitized marine grade Al‐Mg (AA 5754) alloy are experimentally evaluated. Received alloy is sensitized at temperatures of 150°C (SENS50) and 175°C (SENS75) for 100 hours. Fracture parameters, KIc and JIc, are experimentally evaluated. Slow strain rate tensile tests at a crosshead speed of 0.004, 0.006, and 0.01 mm/min; fatigue crack growth tests at load ratios (R = Pmin/Pmax) of 0.1, 0.2, and 0.5; and low cycle fatigue tests at four strain amplitudes of (0.3‐0.6)% are performed for SENS50 and SENS75 alloys. Relatively lower magnitude of fracture toughness values are observed for SENS75 specimen. Severe degradation in tensile properties, fatigue crack growth characteristics, and low cycle fatigue lives are observed for SENS75 samples. Extended finite element method is adopted to simulate the elasto‐plastic crack growth during fracture toughness evaluation. Scanning electron microscopy (SEM) is used to understand the failure mechanism of sensitized alloys.

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Section: Examination Of Fracture Surfaces By Semsupporting

confidence: 80%

Investigation of fatigue and fracture behaviour of sensitized marine grade aluminium alloy AA 5754

Kumar

Singh

2019

Fatigue Fract Eng Mat Struct

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“…The fracture surface microscopic examination revealed typical dimpled features away from the crack initiation points, where unstable crack growth is expected. Fan et al [17] observe a similar dimple morphology in the fatigue fracture surface of 333 aluminium alloys. Tucker et al [34] observed that the number of such void features increased with the increasing strain rate while examining the fracture surface of A356-T6 alloy that was deformed monotonically with strain rates ranging from 0.1% s −1 to 1 • 10 5 % s −1 .…”

Section: Discussionmentioning

confidence: 73%

“…Fatigue cracks in cast aluminium alloys often tend to initiate from shrinkage or gas porosities [17,35]. Furthermore, the damage evolution in cast aluminium alloys such as A356 is also dictated by the size and shape of the silicon particles and secondary phase precipitates [36].…”

Section: Fractography-role Of Shrinkage Porosity and Cleaved Silicon mentioning

confidence: 99%

“…Silicon particles fracture, and voids form and grow around these fractured Si particles; when they subsequently coalesce, cracks form and propagate, leading to eventual material failure under deformation [36]. Fan et al [17] observed that fatigue cracks often initiated from pores, cracked silicon particles, or iron-based intermetallics, causing fatigue failure in 333 aluminium alloys. The role of porosities in fatigue crack initiation in the tested A356-T7 + 0.5% Cu cast aluminium alloy is highlighted in our prior research work [35].…”

Section: Fractography-role Of Shrinkage Porosity and Cleaved Silicon mentioning

confidence: 99%

“…The study also highlights the similar number of cycles to failure for high temperature-low cycle fatigue tests and out-of-phase thermomechanical fatigue tests for similar test strain rates in A357 alloys and suggests isothermal low cycle fatigue tests as an alternative for the more expensive thermomechanical fatigue tests for use in cylinder head design. Fan et al [17] studied the effect of strain rate on the cyclic deformation behaviour of 333 aluminium alloy (AlSi9Cu3) at room temperature and observed that the cyclic hardening ratio increased with increasing strain rates up to strain rates of 0.25 min −1 and decreased when the strain rate was increased further. Furthermore, characterization of the dislocation structures by the authors using a transmission electron microscope indicate the role of differing dislocation structures and mechanisms in determining the cyclic hardening behaviour of the alloy at various strain rates.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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Experimental and Numerical Investigations of Cyclic Plastic Deformation of Al-Mg Alloy

Kumar

Singh

2019

J. of Materi Eng and Perform

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Influences of strain rate on the low cycle fatigue behavior of gravity casting Al alloys

Cited by 18 publications

References 20 publications

Investigation of fatigue and fracture behaviour of sensitized marine grade aluminium alloy AA 5754

Investigation of fatigue and fracture behaviour of sensitized marine grade aluminium alloy AA 5754

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

Experimental and Numerical Investigations of Cyclic Plastic Deformation of Al-Mg Alloy

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