Influence of thermal ageing on the fracture and lifetime of additively manufactured mold inserts

Ali Davoudinejad*, Mohammad Reza Khosravani, David Bue Pedersen, Guido Tosello

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Due to the significant technical benefits of additive manufacturing (AM), its application has grown considerably in recent years. In this respect, the integration of AM in the injection molding (IM) process chain for tooling purposes is an ongoing research topic. In the current study, the design, fabrication and use of a tool inserts for injection molding process fabricated by a vat photopolymerisation technique. Since molds during the injection molding process are subjected to cyclic thermal variation, accelerated thermal ageing was applied on the AM mold inserts to emulate the effect of continuous production on the tool lifetime. The additively manufactured mold inserts were exposed to thermal cycling loading in the range between room temperature up to 100 °C, and then, they were used in the actual injection molding process. According to the obtained results, effects of thermal ageing on behavior of the mold inserts are demonstrated. Moreover, fractographic analysis is performed on the fractured surfaces to determine crack initiation and propagation on the mold inserts. The current study provides insight about ageing and fracture of IM mold inserts produced by vat photopolymerisation , and these results can be used for the development of computational models, future material design and load-carrying capabilities of additively manufactured mold inserts to expand the use of AM for tooling purposes.
Original languageEnglish
Article number104694
JournalEngineering Failure Analysis
Volume115
Number of pages12
ISSN1350-6307
DOIs
Publication statusPublished - 2020

Keywords

  • Additive manufacturing
  • Injection molding
  • Thermal ageing
  • Mechanical fracture
  • Soft tooling

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