Residual Stress in Automotive Powertrains: Methods and Analyses

Abstract:

Residual stress is one of the main reasons for failure of automotive cylinder blocks and engine heads. These failures are typically associated with in-service distortion or cracking occurring in engines during operation cycles. The problem becomes more pronounced for engines that are running at elevated operating pressures and temperatures, limiting R&D options in developing and implementing higher-efficiency engines. New aluminum alloys and manufacturing methods have been introduced with varying degree of success, in many cases affected by the stress magnitudes and stress distribution in the component. Therefore, active research is ongoing internationally on finding the most reliable methods of stress analysis as a basis for developing efficient methods for stress mitigation. The current study presents a comparison between two experimental strain measurements techniques: a destructive method that is based on application of strain gauge sensors, and a non-destructive method using neutron diffraction. The results indicate that although the strain gauge method provides an indication of the nature (i.e. compression or tension) of strain within a component, this method should primarily be used for surface measurements and qualitative analyses only. Neutron diffraction remains the superior technique for strain analysis, particularly for engineering components with complex geometries. The results from this study provide the transportation industry with a more comprehensive understanding of the efficacy of utilizing strain gauge sensors, neutron diffraction or finite element modelling for measuring the residual strain in cast components. The results will help manufacturers to develop the next generation of powertrain systems with increased efficiency and improved performance.

• Periodical: Materials Science Forum (Volume 1016)
• Pages: 1291-1298
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.1016.1291
• Online since: January 2021
• Authors: Dimitry Sediako*, Joshua Stroh, Sina Kianfar
• Keywords: Finite Element Modeling, Neutron Diffraction, Residual Stress, Strain Gauges

References

[1] F. D'Elia, C. Ravindran, and D. Sediako, Interplay among solidification, microstructure, residual strain and hot tearing in B206 aluminum alloy, Mater. Sci. Eng. A, 624 (2014) 169–180.

DOI: 10.1016/j.msea.2014.11.057

[2] A. Lombardi, F. D'Elia, C. Ravindran, D. Sediako, B. Murty, and R. MacKay, Interplay Between Residual Stresses, Microstructure, Process Variables and Engine Block Casting Integrity, Metall. Mater. Trans. A, 43 (2012) 5258–5270.

DOI: 10.1007/s11661-012-1340-0

[3] J. Robinson and D. Tanner, The Magnitude of Heat Treatment Induced Residual Stresses and the Thermal Stress Relief of Aluminium Alloys, Mater. Sci. Forum, 404–407 (2009) 355–360.

DOI: 10.4028/www.scientific.net/msf.404-407.355

[4] ASTM, E837-13a Standard test method for determining residual stresses by the hole-drilling strain-gage method, ASTM E, (2008).

DOI: 10.1520/e0837-01e01

[5] Y. Motoyama, N. Ebihara, H. Shiga, T. Sato, H. Kambe, and M. Yoshida, Thermal Stress Analysis of Residual Stress in a Cylindrical Aluminum Casting with Cast-in GCI Liner, Taking Recovery Behavior Effect into Account, Metall. Mater. Trans. A, 49 (2018) 5619–5635.

DOI: 10.1007/s11661-018-4897-4

[6] N. Rossini, M. Dassisti, K. Benyounis, and A. Olabi, Methods of measuring residual stresses in components, Mater. Des., 35 (2012) 572–588.

DOI: 10.1016/j.matdes.2011.08.022

[7] J. Stroh and D. Sediako, Residual Strain Characterization of an Advanced Aluminum Marine Alloy Using In-Situ Neutron Diffraction, Light Metals - Applications and Fitness-for-Service Characterization, Materials Science & Technology, (2018) 974-982.

DOI: 10.7449/2018/mst_2018_974_982

[8] J. Stroh and D. Sediako, Residual Stress Characterization for Marine Gear Cases in As-Cast and T5 Heat Treated Conditions with Application of Neutron Diffraction, Light Metals, (2019) 395-399.

DOI: 10.1007/978-3-030-05864-7_50

[9] D. Sediako, F. D'Elia, A. Lombardi, A. Machin, C. Ravindran, C. Hubbard, and R. Mackay, Application of Neutron Diffraction in Analysis of Residual Stress Profiles in the Cylinder Web Region of an as-Cast V6 Al Engine Block with Cast-In Fe Liners, Suppl. Proc. Mater. Fabr. Prop. Charact. Model., 2 (2011) 299–308.

DOI: 10.1002/9781118062142.ch37

[10] S. Ahmad, D. Sediako, A. Lombardi, C. Ravindran, R. Mackay, and A. Nabawy, Assessment of Residual Stress in T5 Treated 319 Aluminum Alloy Engine Blocks Using Neutron Diffraction, SAE Tech. Pap. Ser., 1 (2016).

DOI: 10.4271/2016-01-0353

[11] X. Su, J. Lasecki, J. Allison, and J. Jan, Thermal and Residual Stress Analysis of an Engine Block with Cast-In Liners, in 1st proceedings from Materials Solutions Conference 2003, International symposium on metallurgical modeling for aluminum alloys; Metallurgical modeling for aluminum alloys, (2003) 63–68.

[12] E. Carrera, A. Rodríguez, J. Talamantes, S. Valtierra, and R. Colás, Measurement of residual stresses in cast aluminium engine blocks, J. Mater. Process. Technol., 189 (2007) 206–210.

DOI: 10.1016/j.jmatprotec.2007.01.023

[13] M. Al-Shorman, Nondestructive Residual Strain Measurements Using High Energy X-ray Diffraction, Dissertation for Doctor of Philosophy, Iowa State University (2008).

DOI: 10.31274/etd-180810-2483

[14] D. Sediako, J. Stroh, A. Mcdougall, and E. Aghaie, Residual Stress Analysis of A362 Aluminum Alloy Gear Case using Neutron Diffraction, Thermec, (2018).

DOI: 10.4028/www.scientific.net/msf.941.1288

[15] A. Lombardi, D. Sediako, C. Ravindran, and R. Mackay, Residual Stress Mapping along the Cylinder Bores of Al Alloy Engine Blocks Subjected to Production Solution Heat Treatment Schedule, SAE Int. J. Mater. Manuf., 7 (2014).

DOI: 10.4271/2014-01-0837

[16] H. Coules, L. Cozzolino, P. Colegrove, S. Ganguly, S. Wen, and T. Pirling, Residual strain measurement for arc welding and localised high-pressure rolling using resistance strain gauges and neutron diffraction, J. Strain Anal., 47 (2012) 576–586.

DOI: 10.1177/0309324712453408

[17] M. Walker, D. Hess, and D. Sediako, Residual Stress Analysis in Semi-Permanent Mold Engine Head Castings, Light Metals, (2014) 355–357.

DOI: 10.1002/9781118888438.ch60

[18] P. Hofer, E. Kaschnitz, and P. Schumacher, Distortion and Residual Stress in High-Pressure Die Castings: Simulation and Measurements, JOM, 66 (2014) 1638–1646.

DOI: 10.1007/s11837-014-1118-5

[19] Y.-X. Zhang, Y.-P. Yi, S.-Q. Huang, and F. Dong, Influence of quenching cooling rate on residual stress and tensile properties of 2A14 aluminum alloy forgings, Materials Science & Engineering A, 674 (2016) 658-665.

DOI: 10.1016/j.msea.2016.08.017

[20] J. Stroh, A. Piche, D. Sediako, A. Lombardi, and G. Byczynski, The effects of solidification cooling rates on the mechanical properties of an aluminum inline-6 engine block, Light Metals Aluminum Alloys, Processing and Characterization - Microstructures and Mechanical Properties of Aluminum Alloys, (2019) 505–512.

DOI: 10.1007/978-3-030-05864-7_65