Design and analysis of expansive grout material based gripping systems for tensile testing of large composite bars

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Tensile and shear testing of large fiber-reinforced polymer composite (FRPC) specimens with circular cross-section to final failure has always been challenging. A major difficulty is that the local stress triaxiality near the gripping ends usually leads to premature failure at these locations, instead of the desired test gauge sections. Recently an alternative method using expansive grout materials has been proposed, but there have been no well-established design guidelines due to lack of understanding of the gripping pressure developed by the expansive grout material. In this study, an analytical solution has been derived to correlate the hoop strain on the outer surface of the confining pipe (caused by grout expansion in the pipe) to the grout elastic modulus and linear expansion coefficient. By measuring the exterior surface hoop strains of two different steel pipes, the elastic modulus and linear expansion coefficient have been determined to be 4.52±0.07 msi and 0.158±0.008 % respectivly. The solution has also been expanded to include the composite specimens and predict the gripping pressure at specimen-grout material interface for any given pipes, which makes it possible to select improved expansive grout material based gripping system parameters including the minimum gripping length, optimum confinement pipe dimensions, and minimum grout material volume.

Original languageEnglish (US)
Title of host publicationSAMPE 2012 Conference and Exhibition
StatePublished - 2012
Event2012 SAMPE International Symposium and Exhibition - Emerging Opportunities: Materials and Process Solutions - Baltimore, MD, United States
Duration: May 21 2012May 24 2012

Publication series

NameInternational SAMPE Technical Conference

Other

Other2012 SAMPE International Symposium and Exhibition - Emerging Opportunities: Materials and Process Solutions
CountryUnited States
CityBaltimore, MD
Period5/21/125/24/12

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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