An experimental and numerical assessment of DCB tests on glass/polyester curved beams cut out from pipes

摘要: Abstract The aim of this work is to define a suitable procedure in order measure the interlaminar fracture toughness circumferential specimens cut out from ready-to-use glass reinforced polymer (GRP) pipes made by centrifugal casting. Double Cantilever Beam (DCB) tests were performed assess critical strain energy release rate mode I ( G Ic ), which was considered equal initiation values. In fact, intrinsic heterogeneous composition these GRP promoted occurrence uncontrollable fibre bridging, disturbed crack propagation and avoided attainment smooth R -curve. specimen's geometry leads loading into complex stress state at tip opening. This mixed-mode situation numerically quantified using virtual closure technique. For that purpose, 2D FEM analysis with interface finite elements used. A progressive failure including cohesive damage model also performed. numerical reproduced DCB allowed estimation II influence on measured Two different data reduction schemes, modified compliance calibration (MCC) compliance-based beam method (CBBM), used calculate Both methods are based classical theory since it proved comparison curved gives accurate results for present case. These assessed model.