This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Frequency Effects on High-Density Polyethylene Failure under Cyclic Loading
Technical Paper
2017-01-0332
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
High density polyethylene (HDPE) is widely used in automotive industry applications. When a specimen made of HDPE tested under cyclic loading, the inelastic deformation causes heat generated within the material, resulting in a temperature rise. The specimen temperature would stabilize if heat transfer from specimen surface can balance with the heat generated. Otherwise, the temperature will continue to rise, leading to a thermo assist failure. It is shown in this study that both frequencies and stress levels contribute to the temperature rise. Under service conditions, most of the automotive components experience low cyclic load frequency much less than 1 Hz. However, the frequency is usually set to a higher constant number for different stress levels in current standard fatigue life tests. This practice may lead to confusion in understanding the failure mechanism of polymer material and the fatigue data obtained from the lab test would not be appropriate for evaluation of the real components. In order to clarify this confusion, a critical stress-frequency failure map is proposed in this paper to identify if the failure is due to overheating or crack propagation. Additionally a mathematical methodology is developed to model temperature increase due to energy dissipation under cyclic loading, with help of which the critical stress-frequency failure map is numerically predicted. Good agreement is found between the experimental results and model predictions, which sheds light on thorough understanding of the complicated failure mechanism in thermoplastic polymers.
Recommended Content
Authors
Citation
Qi, Z., Lu, L., Doan, L., Thota, B. et al., "Frequency Effects on High-Density Polyethylene Failure under Cyclic Loading," SAE Technical Paper 2017-01-0332, 2017, https://doi.org/10.4271/2017-01-0332.Also In
References
- Hartwig , G Knaak , S Fatigue behaviour of polymers Cryogenics 1991 31 4 231 233
- Vlachopoulos , J. Strutt , D. Basic heat transfer and some applications in polymer processing http://www.polydynamics.com/heat_transfer_revised.pdf
- Riddell , M. N. Koo , G. P. O'Toole J. L. Fatigue mechanisms of thermoplastics Polymer Engineering & Science 1966 6 4 363 368
- Zhou , Y. Brown , N. The mechanism of fatigue failure in a polyethylene copolymer Journal of Polymer Science Part B: Polymer Physics 1992 30 5 477 487
- Harcup , J. P. Duckett , R. A. M. I. Ward fatigue crack growth in polyethylene Material Dependence, I 2 2000
- Mortazavian S. , Fatemi A. Effect of cycling frequency and self-heating on fatigue behavior of reinforced and unreinforced thermoplastic polymers Polymer Engineering and Science 2015 10 55 2355 2367
- Eftekhari M. , Fatei A. On the strengthening effect of increasing cycling frequency on fatigue behavior of some polymers and their composites: Experiments and modeling International Journal of Fatigue 2016 87 153 166
- Manson , S. S. Halford , G. R. Fatigue and durability of structural materials ASM International 2006 328
- Lampman Steve Characterization and failure analysis ASM International 2003 249 258
- Jiang C. , Jiang H. , Zhang J. , Kang G. A viscoelastic-plastic constitutive model for uniaxial ratcheting behaviors of polycarbonate Polymer Engineering and Science 2015 11 55 2559 2565
- Eftekhari M. , Fatemi A. Creep behavior of neat, talc-filled, and short glass fiber reinforced thermoplastics Coposites Part B: Engineering 2016 97 68 83
- Shariati M. , Hatami H. , Yarahmadi H. , Eipakchi H. R. An experimental study on the ratcheting and fatigue behavior of polyacetal under uniaxial cyclic loading 2011 34 302 312
- Tim A. Georg Menges , Osswald Material science of polymers for engineers (3rd edition) Hanser Publishers 2012 49 82
- Eftekhari M. , Fatemi A. Creep-fatigue interaction and thermo-mechanical fatigue behaviors of thermoplastics and their composites International Journal of Fatigue 2016 91 136 148
- Dao , K. Fatigue failure mechanisms in polymer composites Polymer Composites 1982 3 1 12 17
- Dao K. , Dicken D. J. Fatigue failure mechanisms in polymers Polymer Engineering & Science 1987 27 4 271 276
- Hal F. Brinson , L. Brinson Catherine Polymer engineering science and viscoelasticity: An introduction (2nd edition) Springer 2015 231 252
- Designation: D7791-12 Standard test method for uniaxial fatigue properties of plastics ASTM International
- ISO 527-2:2012 Plastics-Determination of tensile properties-Part 2: Test conditions for moulding and extrusion plastics 2012
- Ishiyama C. , Higo Y. Effects of humidity on Young’s modulus in poly(methylmethacrylate) Journal of Polymer Science Part B 2002 40 5 460 465
- Hosford William F. Mechanical behavior of materials Cambridge University Press 2005 262 278
- Xinghe Shen , Zihui Xia , Fernand Ellyin Cyclic deformation of an epoxy polymer, Part I: Experimental investigation Polymer Engineering and Science 2004 44 12 2240 2246
- Zihui Xia , Xinghe Shen , Fernand Ellyin Cyclic deformation of an epoxy polymer, Part II: Predictions of viscoelastic constitutive models Polymer Engineering and Science 2005 45 1 103 113
- Vlachopoulos John , Strutt David Basic heat transfer and some applications in polymer processing Plastics Technician’s Toolbox 2002 2 21 33