Correlation of Tribological Behavior and Fatigue Properties of Filled and Unfilled TPUs

Wang, Chao; Stiller, Tanja; Hausberger, Andreas; Pinter, Gerald; Grün, Florian; Schwarz, Thomas

doi:10.3390/lubricants7070060

Cited by 5 publications

(2 citation statements)

References 26 publications

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“…Furthermore, fatigue measurements on the Crack Round Bar (CRB) were conducted. The CRB geometry (a dumbbell with a circumferential notch in the middle) was developed for accelerated testing of quasi-brittle failure resistance of polymers, elastomers, and thermoplastic elastomers [ 68 , 69 , 70 ]. In principle, due to the presence of the notch, this specimen geometry would allow the crack length and crack growth rate to be measured using a Paris approach, focusing on the crack propagation regime; however, due to the cylindrical geometry, the crack front results are complex, and it is difficult to assess crack length measurements through optical methods.…”

Section: Resultsmentioning

confidence: 99%

Fatigue Analysis and Defect Size Evaluation of Filled NBR including Temperature Influence

et al. 2022

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The fatigue behavior of a filled non-crystallizing elastomer was investigated on axisymmetric dumbbell specimens. By plotting relevant Wöhler curves, a power law behavior was found. In addition, temperature increases due to heat build-up were monitored. In order to distinguish between initiation and crack growth regimes, hysteresis curves, secant and dynamic moduli, dissipated and stored energies, and normalized minimum and maximum forces were analyzed. Even though indications related to material damaging were observed, a clear trend to recognize the initiation was not evident. Further details were revealed by considering a fracture mechanics. The analysis of the fracture surfaces evidenced the presence of three regions, associated to initiation, fatigue striation, and catastrophic failure. Additional fatigue tests were performed with samples in which a radial notch was introduced. This resulted in a reduction in lifetime by four orders of magnitude; nevertheless, the fracture surfaces revealed similar failure mechanisms. A fracture mechanics approach, which considered the effect of temperature, was adopted to calculate the critical defect size for fatigue, which was found to be approximately 9 μm. This value was then compared with the particle size distribution obtained through X-ray microcomputed tomography (μ-CT) of undamaged samples and it was found that the majority of the initial defects were indeed smaller than the calculated one. Finally, the evaluation of J-integral for both unnotched and notched dumbbells enabled the assessment of a geometry-independent correlation with fatigue life.

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Section: Resultsmentioning

confidence: 99%

Fatigue Analysis and Defect Size Evaluation of Filled NBR including Temperature Influence

et al. 2022

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“…Numerous studies have been conducted on the fretting behaviors of metals. The fretting behavior, fatigue properties, and damage mechanisms of thermoplastic elastomer-to-metal were discussed in our previous work [12,13]. However, the impact of material properties on their fretting behaviors is still not understood well.…”

Section: Introductionmentioning

confidence: 99%

Fretting Behavior of Thermoplastic Polyurethanes

et al. 2019

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Fretting tests were conducted with five different thermoplastic polyurethanes against a steel ball. Their fretting behaviors were investigated under various test parameters, such as normal load and displacement amplitude. In order to test the sliding performances, tribological tests were conducted using a ring-on-disc setup. The results show that their fretting behaviors can be related to the dynamic mechanical properties, which were characterized by dynamic mechanical analysis (DMA). The three fretting regimes were identified by means of hysteresis and wear scar analysis. In addition, investigations were carried out until the transition regimes occurred. Different wear processes were revealed for each of the three regimes. Differences were identified using dissipated energy. The profiles of wear scars and the counterparts were analyzed using a microscope. The coefficient of friction was calculated separately for the partial slip and gross slip regimes. In the mixed fretting regime, the coefficient of friction is almost at the same level among the five materials. In the partial slip regime, however, it can be distinguished. Temperature measurements were conducted on the counterparts during the tests. Overall, the material that showed the best tribological properties also performed the best in the fretting tests.

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Fatigue Behavior of Elastomeric Components: A Review of the Key Factors of Rubber Formulation, Manufacturing, and Service Conditions

et al. 2023

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Correlation of Tribological Behavior and Fatigue Properties of Filled and Unfilled TPUs

Cited by 5 publications

References 26 publications

Fatigue Analysis and Defect Size Evaluation of Filled NBR including Temperature Influence

Fatigue Analysis and Defect Size Evaluation of Filled NBR including Temperature Influence

Fretting Behavior of Thermoplastic Polyurethanes

Fatigue Behavior of Elastomeric Components: A Review of the Key Factors of Rubber Formulation, Manufacturing, and Service Conditions

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