TY - JOUR A1 - Brunner, A. J. A1 - Bohse, Jürgen T1 - Acoustic emission standards and guidelines 2002 - a comparative assessment and perspectives JF - The e-journal of nondestructive testing & ultrasonics N2 - A comparative analysis of selected standards and guidelines on Acoustic Emission testing published by international and national organisations yields an assessment of the current status of standardisation. Areas where existing documents do not yet exist or appear unsatifactory for some reason are identified and formulated as perspectives for further work. In the future, structural integrity assessment with Acoustic Emission methods is expected to gain in importance. PY - 2002 UR - http://www.ndt.net/article/v07n09/21/21.htm SN - 1435-4934 VL - 7 IS - 9 SP - 1 EP - 10 PB - NDT.net CY - Kirchwald AN - OPUS4-1792 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Bohse, Jürgen A1 - Krietsch, Torsten A1 - Chen, J. H. A1 - Brunner, A. J. ED - Williams, J. G. ED - Pavan, A. T1 - Acoustic emission analysis and micro-mechanical interpretation of mode I fracture toughness tests on composite materials T2 - Fracture of polymers, composites, and adhesives N2 - Mode I fracture toughness tests on Double Cantilever Beam specimens from carbon-fibre and glassfibre reinforced polymer-matrix composites were monitored with Acoustic Emission (AE) and loaddisplacement traces and delamination lengths were recorded. AE characterized the kinetics of delamination propagation. The progress of AE activity and AE intensity with load and AE source location plots are used to determine the delamination onset on the microscopic and macroscopic scale. Energy dissipating processes initiated in the damage zone near the delamination tip. Low Interface adhesion results in lower debonding stresses and larger damage zones compared with composites with good adhesion. Time-dependent linear location of AE sources yields the average length of the damage zone and the average speed of delamination propagation. Parameter analysis has been used empirically for identifying AE source mechanisms. A new Classification Software for transient AE waveforms permits identification of the source mechanism of individual AE signals. A micro-mechanical fracture model based on the AE results describes the contributions of microscopic matrix and Interface mechanisms to the interlaminar fracture energy. T2 - 2nd ESIS TC4 Conference on Fracture of Polymers, Composites, and Adhesives CY - Les Diablerets, Switzerland DA - 13.09.1999 KW - Mode I KW - DCB test KW - Acoustic emission analysis KW - Polymer composites KW - Damage zone KW - Micro-mechanisms KW - Interface adhesion KW - Micro-mechanical fracture model KW - Interlaminar fracture energy PY - 2000 SN - 0-08-043710-9 SN - 1566-1369 N1 - Serientitel: ESIS publication – Series title: ESIS publication IS - 27 SP - 15 EP - 26 PB - Elsevier CY - Amsterdam AN - OPUS4-4153 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -