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Experimental Investigation of Strain Concentrations Caused by Inserts in Sandwich Beams
Author(s) -
Tsouvalis N. G.,
Kollarini M. J.
Publication year - 2008
Publication title -
strain
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.477
H-Index - 47
eISSN - 1475-1305
pISSN - 0039-2103
DOI - 10.1111/j.1475-1305.2007.00369.x
Subject(s) - insert (composites) , materials science , composite material , core (optical fiber) , bending , composite number , sandwich structured composite , strain (injury) , beam (structure) , tension (geology) , stress (linguistics) , stress–strain curve , plane stress , structural engineering , deformation (meteorology) , compression (physics) , finite element method , medicine , linguistics , philosophy , engineering
This paper presents an experimental study of the strain concentrations developing across the insert–core junctions in a sandwich beam with an implanted stiff insert into its core. Strain measurements were carried out at several positions on the skins and across the insert–core junction, for several sandwich beam specimens loaded in 3‐points bending and having inserts with various geometries. The materials used were typical marine glass/polyester composite and PVC foams and the specimens were manufactured with the vacuum infusion method. A full material characterization was performed for the composite skins. The experimental results demonstrated a pure linear bending response of the specimens, as well as significant strain concentration factors across the insert–core junction, reaching values up to 3.3. Strain concentration factors measured for butt inserts were lower than those measured on the tension side of the specimens with scarf inserts. Transverse strains measurements verified that all specimens were in a plane stress state.