Energy dissipation under thermomechanical fatigue loading

Gosar, Aleš; Nagode, Marko

doi:10.1016/j.ijfatigue.2012.03.011

Cited by 9 publications

(6 citation statements)

References 12 publications

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“…• Tensile test [50,51]: The effects of aging on the stress-strain curves obtained by tensile tests are presented. The evolution of Young's modulus, failure stress and failure strain are plotted for different aging conditions: Tensile response is analyzed for an oxidation temperature of 200 C after various aging times of 0, 30, 50, 100, and 199 h. • Loading-unloading test [52][53][54]: It is necessary to analyze the loss of stiffness and the plastic deformation evolution to understand the effect of aging conditions on the damage and deformation mechanisms. Loading-unloading tensile tests are performed at aging temperature of 200 C after various oxidation times of 0, 30, 50, 100, and 199 h. • Fatigue loading [45,[55][56][57][58]: Tension-tension fatigue tests have been performed at 10 Hz to compare the fatigue life time of PPS composite at various aging temperatures and times.…”

Section: Effects Of Thermal Aging On Overall Mechanical Behaviormentioning

confidence: 99%

Thermal aging effects on overall mechanical behavior of short glass fiber‐reinforced polyphenylene sulfide composites

Zuo

Fitoussi

Shirinbayan

et al. 2018

Polymer Engineering & Sci

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In this article, the overall mechanical properties of a short glass fiber‐reinforced polyphenylene sulfide (PPS) composite were tested after oxidation at different temperatures (140, 160, 180, and 200°C), with a maximum oxidation time of approximately 5,300 h. In aspect of thermal aging process, the oxidation rates in 200 and 180°C are considerably harsher and faster than the case in 160 and 140°C, according to the concentration evolution of [C=O]. In aspect of mechanical properties, for virgin samples, due to an excellent fiber–matrix adhesion, no progressive damage is developed. Moreover, the fatigue results of aged samples show that the fatigue lifetime of PPS composites decreases more and more obviously with the oxidation time increasing while no significant loss of stiffness is observed. In addition, both monotonic and cyclic loadings are basically driven by the PPS matrix deformation. In the end, the relationship between fatigue lifetime and concentration of [CO] is built and discussed. POLYM. ENG. SCI., 59:765–772, 2019. © 2018 Society of Plastics Engineers

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Section: Effects Of Thermal Aging On Overall Mechanical Behaviormentioning

confidence: 99%

Thermal aging effects on overall mechanical behavior of short glass fiber‐reinforced polyphenylene sulfide composites

Zuo

Fitoussi

Shirinbayan

et al. 2018

Polymer Engineering & Sci

View full text Add to dashboard Cite

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“…A common one is to take a closed plastic hysteresis loop of a stress-strain material response and numerically calculate the integral of the enclosed area (Amiable et al, 2006;Korsunsky et al, 2007;Oldham and Abou-Hanna, 2011). It was shown that, in the cases of TMF loading with variable load amplitude, the simulated hysteresis loops do not necessarily close (Gosar and Nagode, 2012). As a result, the integration approach cannot be applied.…”

Section: Introductionmentioning

confidence: 99%

“…With the operator approach, the dissipated energy of plastic deformation as well as the associated elastically recoverable (stored) energy are readily calculated Nagode, 2012, 2013). The dissipated energy is obtained for each segment with respect to the movements of the slider, whereas the stored energy is obtained with respect to the potential energy of the corresponding spring (Gosar and Nagode, 2012).…”

Section: Introductionmentioning

confidence: 99%

Dissipated energy-based fatigue lifetime calculation under multiaxial plastic thermo-mechanical loading

Gosar

Nagode

2014

International Journal of Damage Mechanics

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The paper concerns the metallic material lifetime calculation under arbitrary multiaxial thermo-mechanical fatigue loading. An energy-based damage operator approach ([Formula: see text]) is introduced. In such an approach, fatigue lifetime is continuously computed by the Prandtl type damage operator. The dissipated energy of plastic deformation is applied as a damage parameter that is obtained at any moment by the recently developed multiaxial energy operator approach. Strain-life curves are transformed into energy-cycle damage curves in order to associate the damage parameter with the fatigue lifetime. The present approach is validated on turbocharger housing. A satisfactory evaluation of the fatigue lifetime is obtained even though visco-plasticity and mean stress correction are not addressed yet.

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“…A Lloyds Texture Analyzer 500 was used to compress 7 mm diameter pellets of samples through a compression‐relaxation program at a movement rate of 1 mm/min carried out at 1, 2, 3, 4, and 5 mm set deflections. Similar to calculation of the energy dissipated through viscoelastic deformation the trapezoidal rule, eq. , was used to calculate the integral of the compression and relaxation curves, the ratio of which was identified as the RF and used to determine the energy retention potential of the elastomeric microstructure.…”

Section: Methodsmentioning

confidence: 99%

Polymeric seal degradation in nuclear power plants: Effect of gamma radiation on sealing properties

Porter

Edge

Ogden

2016

J of Applied Polymer Sci

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An effort has been made to bridge the gap between academic knowledge of polymeric seal degradation and industrial practices. A series of physical and mechanical properties that can be related to the sealing behavior of three commercial samples of nitrile rubber have been studied for their degradation when exposed to gamma radiation. For all samples the glass transition temperature (Tg) and retention factor (RF) were found to increase with total dose whilst percentage change in mass (ΔM%) was found to decrease. The ultimate uptake of carbon dioxide (CO2) did not appear to change with radiation dose but the kinetics of the absorption process were found to decrease, suggesting the formation of crosslinks. The crosslinks formed appear to be dependent on the original material composition and comparison against degradation of material properties supports the theory behind butadiene, BDN, content being linked to a propensity for crosslink clustering. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44618.

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Energy dissipation under thermomechanical fatigue loading

Cited by 9 publications

References 12 publications

Thermal aging effects on overall mechanical behavior of short glass fiber‐reinforced polyphenylene sulfide composites

Thermal aging effects on overall mechanical behavior of short glass fiber‐reinforced polyphenylene sulfide composites

Dissipated energy-based fatigue lifetime calculation under multiaxial plastic thermo-mechanical loading

Polymeric seal degradation in nuclear power plants: Effect of gamma radiation on sealing properties

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