Date of Award

Summer 1996

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Mechanical & Aerospace Engineering

Program/Concentration

Mechanical Engineering

Committee Director

Ram Prabhakaran

Committee Member

Zia Razzaq

Committee Member

Stephen Cupschalk

Call Number for Print

Special Collections; LD4331.E56 D48

Abstract

Pultruded glass fiber-reinforced polymeric matrix composites are candidate materials for ever-increasing structural applications due to their continuous production capability, light weight and excellent properties. In this investigation an extensive experimental study has been carried out to understand their structure, basic mechanical properties, and influence of fiber orientation on the unnotched, notched and pin-loaded tensile strength. Furthermore, the effects of sea water and tightening torque separately and together on the failure loads and failure modes of the bolted joints are also studied. It is shown that blockshear failure mode is also a principal mode of failure in the bolted joints of these composites in addition to net-tension, bearing, shearout and cleavage. The results of these tests are analyzed using Load and Resistance Factor Design (LRFD) equations, which are used for steel structures, in order to study the applicability of these relations to pultruded composites. Design factors thus obtained are reported and two LRFD-type formulae for block shear and net tension failure in pultruded composite bolted joints are proposed. The use of these relations is shown with numerical examples.

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DOI

10.25777/qmmn-xz12

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