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A Plane Stress Failure Criterion for Inorganically-Bound Core Materials.

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  • معلومة اضافية
    • المصدر:
      Publisher: MDPI Country of Publication: Switzerland NLM ID: 101555929 Publication Model: Electronic Cited Medium: Print ISSN: 1996-1944 (Print) Linking ISSN: 19961944 NLM ISO Abbreviation: Materials (Basel) Subsets: PubMed not MEDLINE
    • بيانات النشر:
      Publication: May 2010- : Basel, Switzerland : MDPI
      Original Publication: Basel, Switzerland : Molecular Diversity Preservation International, 2008-2010.
    • نبذة مختصرة :
      Inorganically-bound core materials are used in foundries in high quantities. However, there is no validated mechanical failure criterion, which allows performing finite-element calculations on the core geometries, yet. With finite-element simulations, the cores could be optimised for various production processes from robotic core handling to the decoring process after the casting. To identify a failure criterion, we propose testing methods, that enable us to investigate the fracture behaviour of inorganically-bound core materials. These novel testing methods induce multiple bi-axial stress states into the specimens and are developed for cohesive frictional materials in general and for sand cores in particular. This allows validating failure criteria in principal stress space. We found that a Mohr-Coulomb model describes the fracture of inorganic core materials in a plane stress state quite accurately and adapted it to a failure criterion, which combines the Mohr-Coulomb model with the Weakest-Link theory in one consistent mechanical material model. This novel material model has been successfully utilised to predict the fracture force of a Brazilian test. This prediction is based on the stress fields of a finite element method (FEM) calculation.
    • References:
      Materials (Basel). 2018 Nov 16;11(11):. (PMID: 30453568)
      Materials (Basel). 2020 Jun 03;13(11):. (PMID: 32503107)
      Materials (Basel). 2020 Jun 20;13(12):. (PMID: 32575726)
    • Grant Information:
      VO 1487/37-1 Deutsche Forschungsgemeinschaft
    • Contributed Indexing:
      Keywords: Mohr-Coulomb; Weibull; foundry core materials; foundry cores; fracture strength; hydrostatic pressure; tri-axial testing; water-glass
    • الموضوع:
      Date Created: 20210109 Latest Revision: 20210126
    • الموضوع:
      20231215
    • الرقم المعرف:
      PMC7825560
    • الرقم المعرف:
      10.3390/ma14020247
    • الرقم المعرف:
      33419146