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Combined effect of artificial aging and fatigue on the mechanical, structural, and morphological properties of polystyrene
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  • Karollyne Monsores,
  • Anderson Silva,
  • Suzane Oliveira,
  • Ricardo Weber,
  • Paulo Feliciano Filho,
  • Larissa Simão,
  • Eduardo de Carvalho,
  • Sergio Monteiro
Karollyne Monsores
Instituto Militar de Engenharia
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Anderson Silva
Instituto Militar de Engenharia
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Suzane Oliveira
Instituto Militar de Engenharia
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Ricardo Weber
Instituto Militar de Engenharia
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Paulo Feliciano Filho
Instituto Federal do Rio de Janeiro
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Larissa Simão
Universidade Estadual do Norte Fluminense
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Eduardo de Carvalho
Universidade Estadual do Norte Fluminense
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Sergio Monteiro
Instituto Militar de Engenharia
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Abstract

The mechanical, structural, and morphological properties of polystyrene (PS) under fatigue combined with accelerated aging were investigated. The results revealed that under the condition of fatigue (tension–tension) combined with UV-B exposure, in the periods of 336 and 575 h, the mechanical resistance presented is lower when compared to PS subjected to only fatigue. The modifications produced by the irradiation were evaluated by physical-chemical tests, which resulted in changes in the properties of the degraded materials, such as reduced molecular mass due to chain cleavage and increased crystallinity. The predominant failure mechanism in mechanically fractured specimens was also influenced by irradiation, so that the hardening of the surface layer was characterized by Vickers microhardness.