The influence of material composition on self-heat buildup of rubber until blowout

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

The influence of material composition on self-heat buildup of rubber until blowout

Popis výsledku v původním jazyce

Rubber components such as tires and shock absorbers are frequently subjected to cyclic mechanical loading. Due to the viscoelastic nature of rubber, part of the mechanical energy is inevitably transformed into heat. This intemal heat accumulation, exacerbated by rubber&apos;s poor thermal conductivity, can lead to dangerously high temperatures that compromise material performance and durability. In extreme cases, a thermal runaway effect causes intemal pressure to rise until the rubber catastrophically ruptures, which is an event known as blowout.This study investigates how the type of elastomer and the concentration of carbon black affect self-heating behavior and the conditions leading to blowout. Rubber compounds were prepared using natural rubber (NR), styrene-butadiene rubber (SBR), and their 50/50 blend, each filled with either 40 or 60 parts per hundred rubber (phr) of N330 carbon black. Specimens were subjected to multi-axial cyclic loading designed to mimic real-world stress conditions. lntemal temperature was measured via a built-in sensor, while surface temperature was simultaneously monitored using a noncontact method.The results reveal a clear link between material composition and the self-heating process. In NR based compounds, heat build-up followed a three phase progression: an initial rapid temperature rise, a plateau-like middle stage, and a final steep increase culminating in blowout. This staged behavior was consistent at both filler loadings. In contrast, pure SBR compounds did not exhibit the final rapid temperature escalation, and no blowout occurred within the test parameters.These findings provide critical insights into the thermal response and safety margins of rub ber materials under repeated mechanical loading. Understanding and predicting the self-heating threshold based on composition enables better design of rubber products with higher resistance to thermal failure, which is essential for improving operational safety and extending service life.

Název v anglickém jazyce

The influence of material composition on self-heat buildup of rubber until blowout

Popis výsledku anglicky

Rubber components such as tires and shock absorbers are frequently subjected to cyclic mechanical loading. Due to the viscoelastic nature of rubber, part of the mechanical energy is inevitably transformed into heat. This intemal heat accumulation, exacerbated by rubber&apos;s poor thermal conductivity, can lead to dangerously high temperatures that compromise material performance and durability. In extreme cases, a thermal runaway effect causes intemal pressure to rise until the rubber catastrophically ruptures, which is an event known as blowout.This study investigates how the type of elastomer and the concentration of carbon black affect self-heating behavior and the conditions leading to blowout. Rubber compounds were prepared using natural rubber (NR), styrene-butadiene rubber (SBR), and their 50/50 blend, each filled with either 40 or 60 parts per hundred rubber (phr) of N330 carbon black. Specimens were subjected to multi-axial cyclic loading designed to mimic real-world stress conditions. lntemal temperature was measured via a built-in sensor, while surface temperature was simultaneously monitored using a noncontact method.The results reveal a clear link between material composition and the self-heating process. In NR based compounds, heat build-up followed a three phase progression: an initial rapid temperature rise, a plateau-like middle stage, and a final steep increase culminating in blowout. This staged behavior was consistent at both filler loadings. In contrast, pure SBR compounds did not exhibit the final rapid temperature escalation, and no blowout occurred within the test parameters.These findings provide critical insights into the thermal response and safety margins of rub ber materials under repeated mechanical loading. Understanding and predicting the self-heating threshold based on composition enables better design of rubber products with higher resistance to thermal failure, which is essential for improving operational safety and extending service life.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

20501 - Materials engineering

Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů