Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
An Approach to Compensate for the Influence of the System Normal Stiffness in CNS Direct Shear Tests
RISE Research Institutes of Sweden, Material och produktion, Tillämpad mekanik. KTH Royal Institute of Technology, Sweden.ORCID-id: 0000-0002-4551-5644
RISE Research Institutes of Sweden, Material och produktion, Tillämpad mekanik.ORCID-id: 0000-0002-3481-1368
2020 (Engelska)Ingår i: Rock Mechanics and Rock Engineering, ISSN 0723-2632, E-ISSN 1434-453X, Vol. 53, s. 2185-2199Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Applying accurate normal load to a specimen in direct shear tests under constant normal stiffness (CNS) is of importance for the quality of the resulting data, which in turn influences the conclusions. However, deficiencies in the test system give rise to a normal stiffness, here designated as system normal stiffness, which results in deviations between the intended and actual applied normal loads. Aiming to reduce these deviations, this paper presents the effective normal stiffness approach applicable to closed-loop control systems. Validation through direct shear tests indicates a clear influence of the system normal stiffness on the applied normal load (13% for the test system used in this work). The ability of the approach to compensate for this influence is confirmed herein. Moreover, it is demonstrated that the differences between the measured and the nominal normal displacements are established by the normal load increment divided by the system normal stiffness. This further demonstrates the existence of the system normal stiffness. To employ the effective normal stiffness approach, the intended normal stiffness (user defined) and the system normal stiffness must be known. The latter is determined from a calibration curve based on normal loading tests using a stiff test dummy. Finally, a procedure is presented to estimate errors originating from the application of an approximate representation of the system normal stiffness. The approach is shown to effectively reduce the deviations between intended normal loads and the actual applied normal loads.

Ort, förlag, år, upplaga, sidor
Springer , 2020. Vol. 53, s. 2185-2199
Nyckelord [en]
Calibration, CNS, Dilatancy, Direct shear test, Normal load, Stiffness test system, Closed loop control systems, Testing, Calibration curves, Constant normal stiffness, Normal displacement, Normal loads, Normal stiffness, Stiffness tests, Stiffness
Nationell ämneskategori
Naturvetenskap
Identifikatorer
URN: urn:nbn:se:ri:diva-44085DOI: 10.1007/s00603-020-02051-0Scopus ID: 2-s2.0-85079467556OAI: oai:DiVA.org:ri-44085DiVA, id: diva2:1396864
Anmärkning

Funding details: BeFo 391; Funding details: Svensk Kärnbränslehantering, SKB; Funding details: Nuclear Waste Management Organization, NWMO; Funding text 1: Open access funding provided by RISE Research Institutes of Sweden. The authors would like to acknowledge the research funding granted by BeFo Rock Engineering Research Foundation (grant proposal BeFo 391) and SKB, Swedish Nuclear Fuel and Waste Management Co, Solna, Sweden. The authors would also like to thank Adjunct Professor Diego Mas Ivars at SKB, Swedish Nuclear Fuel and Waste Management Co; Associate Professor Fredrik Johansson at KTH Royal Institute of Technology; and Adjunct Professor Erland Johnson at RISE Research Institutes of Sweden AB for their valuable contribution to this work.

Tillgänglig från: 2020-02-26 Skapad: 2020-02-26 Senast uppdaterad: 2023-05-25Bibliografiskt granskad

Open Access i DiVA

fulltext(2347 kB)63 nedladdningar
Filinformation
Filnamn FULLTEXT01.pdfFilstorlek 2347 kBChecksumma SHA-512
e93c27d3c35bad09acca691d64f50376d1a9b4289ff2af179c76388c43715dadab0aeaf14128992ea3f4bc528d7ac6e1757c3cbea67a3dfb18c19ddc694ed9f7
Typ fulltextMimetyp application/pdf

Övriga länkar

Förlagets fulltextScopus

Person

Larsson, JörgenFlansbjer, Mathias

Sök vidare i DiVA

Av författaren/redaktören
Larsson, JörgenFlansbjer, Mathias
Av organisationen
Tillämpad mekanik
I samma tidskrift
Rock Mechanics and Rock Engineering
Naturvetenskap

Sök vidare utanför DiVA

GoogleGoogle Scholar
Totalt: 63 nedladdningar
Antalet nedladdningar är summan av nedladdningar för alla fulltexter. Det kan inkludera t.ex tidigare versioner som nu inte längre är tillgängliga.

doi
urn-nbn

Altmetricpoäng

doi
urn-nbn
Totalt: 129 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf