Thermomechanical and Isothermal Fatigue Behavior of Gray Cast Iron for Automotive Brake Discs

Maluf, Omar; Moreto, Jéferson Aparecido; Angeloni, Maurício; Colosio, Marco Antonio; Santos, José; Filho, Waldek Wladimir Bose; Spinelli, Dirceu

doi:10.5772/13970

Cited by 3 publications

(1 citation statement)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The study [19] shows a decrease in the coefficient of friction with increasing titanium content in the disk material (Brembo, 1997), but it is not clear to which type of cast iron it belongs. To provide better resistance to thermal fatigue used gray cast iron, cast iron with nickel, chromium and molybdenum used by General Motors.…”

Section: Analysis Of Literature Data and Problem Statementmentioning

confidence: 99%

The Influence of Titanium as a Desferoidizing Element on the Stability of Production of Magnesium Cast Irons with Compacted Graphite

Аулин¹,

Kropivny²,

Kuzyk³

et al. 2021

Tribol. Ind.

View full text Add to dashboard Cite

The thermodynamic calculations and the obtained dependence of the Gibbs energy of the reactions of formation of titanium oxide, titanium sulfide, titanium nitride and titanium carbide in the melt of magnesium cast iron on their concentrations and melt temperature have been presented in the article. It has been shown that titanium, regardless of the concentration in melt, will primarily perform a deoxidizing effect, interacting with the oxygen. The lower negative values of the Gibbs energies are characterized by the reactions of the interaction of titanium with sulfur, at a concentration of the latter 0.01%, which indicates a decrease in the probability of such reaction occurrence. From a thermodynamic point of view, the reactions of titanium nitride and carbide formation are less probable. The values of the Gibbs energy of the interaction reaction of titanium depend to a large extent on the melt temperature. It has been found that for a more complete realization of the desulfurizing properties of titanium, it is advisable to enter the composition of cast iron during melting and overheating, when the melt temperature reaches maximum values. The optimal conditions for obtaining magnesium cast irons with compacted graphite has been determined. It has been found that the addition of titanium to magnesium cast iron, as a desferoidizing element containing 0.035% S, has a positive effect on stabilizing the formation of compacted graphite.

show abstract

Section: Analysis Of Literature Data and Problem Statementmentioning

confidence: 99%

The Influence of Titanium as a Desferoidizing Element on the Stability of Production of Magnesium Cast Irons with Compacted Graphite

Аулин¹,

Kropivny²,

Kuzyk³

et al. 2021

Tribol. Ind.

View full text Add to dashboard Cite

show abstract

Non-axisymmetric Modeling of a Moving Heat Source for Thermal Stress and Fatigue Analysis of Railway Vehicle Disc Brakes

Deressa,

Ambie

2023

Urban Rail Transit

View full text Add to dashboard Cite

Railroad vehicles require the use of disc brakes for safety purposes, however, the brakes are susceptible to thermal stress, which ultimately shortens their lifespan. Hence, to accurately predict the life of railway disc brakes in thermal load simulations, the availability of a model that considers spatial and temporal variations of temperature and thermal stress is essential. A non-axisymmetric moving heat source model was successfully developed to address spatial temperature variations (Deressa and Ambie in Urban Rail Transit 8(3–4):198–216, 2022. 10.1007/s40864-022-00176-9), and this study aims to extend this model to predict thermal stress and fatigue life, and assess its effectiveness. The analysis includes braking time thermal analysis, cooling time thermal analysis, and structural analysis. Spatially varying temperature is incorporated into the structural analysis to calculate thermal stress and strain. A fracture mechanics-based fatigue life estimation method is applied to critical areas of the friction surface. The model is implemented on two braking conditions (service and emergency) and two disc geometries (actual and modified). The model successfully resolves spatial heat considerations by estimating maximum stress variations of up to 46 MPa along the disc circumference. Stress differences of 3 MPa and 6 MPa are observed between the leading and trailing edges of the pad trace during late and mid-braking times, respectively. Fatigue life results identify critical positions and directions for fatigue life initiation. Additionally, these results are in accord with previous observations available in the literature. The proposed model can be easily implemented in various sliding friction applications such as drum brakes, engine pistons/cylinders, and camshafts.

show abstract

AFS/FEF Student Technology Contest

2017

View full text Add to dashboard Cite

Thermomechanical and Isothermal Fatigue Behavior of Gray Cast Iron for Automotive Brake Discs

Cited by 3 publications

References 7 publications

The Influence of Titanium as a Desferoidizing Element on the Stability of Production of Magnesium Cast Irons with Compacted Graphite

The Influence of Titanium as a Desferoidizing Element on the Stability of Production of Magnesium Cast Irons with Compacted Graphite

Non-axisymmetric Modeling of a Moving Heat Source for Thermal Stress and Fatigue Analysis of Railway Vehicle Disc Brakes

AFS/FEF Student Technology Contest

Contact Info

Product

Resources

About