Investigation of thermo-oxidative ageing effects on the fatigue design of automotive anti-vibration parts

Broudin, Morgane; Marco, Yann; Saux, V. Le; Charrier, Pierre; Hervouet, W.; Gac, Pierre‐Yves Le

doi:10.1051/matecconf/201816508004

Cited by 2 publications

(3 citation statements)

References 25 publications

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“…As for the unaged samples, this decay is interpreted in terms of the melting or non-melting of SIC-grown crystallites, with the SIC-grown mechanism being disadvantaged by the crosslinking. A decrease in fatigue properties during ageing has already been reported in the literature for filled natural rubber [14][15][16] but never for CR.…”

Section: Fatigue Lifetime As a Function Of Oxidation Statementioning

confidence: 90%

“…It has been highlighted that the fatigue life (defined here as the number of cycles before breakage) of rubbers largely depends on a range of parameters such as mechanical loading conditions [7][8][9]. For given test conditions, the fatigue life of rubber also depends on the nature of the gum [10][11] and the additives used for the formulation (fillers and stabilizers [12][13], process conditions, and as expected, ageing of the material before testing [14][15][16]). From the existing studies, if it clearly emerges that the nature of the macromolecular network is one of the key parameters when considering the fatigue behavior of rubber [17][18][19], the network properties of an elastomer have not yet been successfully linked to its fatigue life [20].…”

Section: Introductionmentioning

confidence: 99%

“…From the existing studies, if it clearly emerges that the nature of the macromolecular network is one of the key parameters when considering the fatigue behavior of rubber [17][18][19], the network properties of an elastomer have not yet been successfully linked to its fatigue life [20]. As a result, we propose in this study to investigate the influence of macromolecular modifications induced by oxidation, the final purpose here is to relate chemical ageing and fatigue properties which is poorly documented in the literature to our knowledge [15,16] even non-existent in the case of neoprene. We chose here to modify a polychloroprene network by oxidative ageing, which allows us to assess a large number of different networks over a wide range of crosslink densities.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Relationship between macromolecular network and fatigue properties of unfilled polychloroprene rubber

Gac

Albouy²,

Fayolle³

et al. 2021

Polymer Degradation and Stability

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Section: Fatigue Lifetime As a Function Of Oxidation Statementioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Relationship between macromolecular network and fatigue properties of unfilled polychloroprene rubber

Gac

Albouy²,

Fayolle³

et al. 2021

Polymer Degradation and Stability

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Ozone ageing: experimental methods on pristine and protected natural rubber

Treib

Loos

Johlitz

et al. 2022

Continuum Mech. Thermodyn.

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Many industrial applications require natural rubber (NR) as an irreplaceable polymer for its unique behaviour as its resistance to crack growth. The damage caused by ozone, seen as an ageing accelerator, influences the lifetime of rubber components. The data on ozone-induced ageing experiments are often incomplete or remain unpublished, whereas comprehensive databases for other environmental loads as oxygen do exist. A variety of experimental methods is used to investigate the ageing mechanism of ozone. The ultimate scope is to collect physically based data suitable to include it in thermo-mechanical modelling of the material’s full behaviour. Therefore, NR mixtures, without and with antiozonants: p-phenylenediamine (PPD) and paraffinic wax, are analysed. First, an accelerated, artificial ageing method is developed to reconstruct the real ageing in the laboratory. Experiments conducted henceforth are microhardness tests, uniaxial tensile tests and IR spectroscopy to determine the elastic modulus, the stress response and molecular change due to ageing. Independent of static deformation during the ageing process, both antiozonants show a significant protection effect up to the maximum loading with 75 pphm ozone concentration for 111 h at 50% relative humidity and 40 $$^\circ $$ ∘ C. Paraffinic wax completely prevents measureable mechanical change and no surface cracks are visible, though IR spectra reveal ageing-induced molecular reactions, whereas the pristine and soley 6PPD protected compounds are clearly distinguishable by their surface crack picture. Neither of the material compounds, loaded with or without strain during ozone-ageing, contains cracks of a depth further than 300 $$\upmu {\mathrm {m}}$$ μ m . The data generated on ozone ageing of rubber helps to distinguish it from thermo-oxidative ageing that is described comprehensively in the literature. In conclusion, the data proves the degradation and quantifies some characteristic material changes caused by ozone loading.

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Some problems of increasing reliability and safe operation of heavy mining machines

2021

Geoteh. meh.

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Abstract. In the work, the following rubber parts were subject to research: rubber-metal blocks (BMR) of a prismatic shape, rubber vibration isolators (VR) with a complex free surface shape, rubber-metal vibration isolators (VRM), as well as layered vibration isolators (VRMS). Their use in the design of vibration protection systems for heavy mining vibration machines (vibrating feeders, vibrating conveyors, mixers, etc.) is very relevant. To determine the parameters of rigidity, temperature of dissipative heating and durability of these parts of different configurations, the universally constructive-deformation parameter ( was used. On the basis of the energy criterion, the basic relationships were obtained, which make it possible to determine the indicators of the durability of the designed rubber parts. To determine quantitative indicators of reliability of the vibration isolators under the study, a set of actions was planned to register their failure parameters. The Weibull’s law was adopted as the main distribution law. The goal was to determine such reliability indicators as the probability of no-failure operation for time t, the value of ninety percent MTBF and the boundaries of the confidence interval, in which the actual value of the ninety percent MTBF of the tested rubber parts is located with a 90 % probability. The results of the registration of parameters during testing for the reliability of a batch of vibration isolators of the VRM type for about 16 years are given; received an array of data on failures and their operating time. The results of measurements of the values of the main physical and mechanical characteristics of vibration isolators are presented. The failure criterion of vibration isolators was taken as their main parameters exceeded the permissible values. The results showed that the hypothesis of using the Weibull’s distribution law as a theoretical description of the occurrence of failures is confirmed. The obtained values of the quantitative indicators of the reliability of rubber vibration isolators of elastic suspensions of heavy mining machines are confirmed by theoretical calculations and experimental studies.

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Investigation of thermo-oxidative ageing effects on the fatigue design of automotive anti-vibration parts

Cited by 2 publications

References 25 publications

Relationship between macromolecular network and fatigue properties of unfilled polychloroprene rubber

Relationship between macromolecular network and fatigue properties of unfilled polychloroprene rubber

Ozone ageing: experimental methods on pristine and protected natural rubber

Some problems of increasing reliability and safe operation of heavy mining machines

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