TY - JOUR A1 - Bohse, Jürgen T1 - Acoustic emission characteristics of micro-failure processes in polymer blends and composites N2 - Acoustic emission (AE) characteristics of micro-failure processes in HDPE/PP blends with and without compatibilizer, single-fibre composites (glass/epoxy, carbon/epoxy, glass/polycarbonate) and unidirectionally reinforced multi-fibre composites (glass/polypropylene) were studied. For blends, the number and the elastic fracture energy release of micro-failure processes are theoretically approximated and correlated with the number of AE signals and the AE energy. A qualitative correlation of the mechanical energy released from fibre/matrix debonding and fibre-fracture processes in single-fibre pull-out experiments with the measured AE energy is demonstrated. For the single-fibre fragmentation of glass fibres and carbon fibres, a quantitative approximation of the AE amplitudes at locations of the fragmentation sources is achieved. A new method for the selection of single transient acoustic emissions and the classification of failure mechanisms in composites is introduced. Selected emissions are classified into matrix cracking, fibre breakage and interface processes (fibre/matrix debonding or fibre pull-out) from their total power in defined frequency intervals of the spectral power density. A fracture-mechanics investigation of the delamination behaviour of unidirectional composites accompanied by AE examinations is discussed. The extension of the damage zone around the crack tip is quantified by the location of AE events and compared with the theoretically approximated dimensions. The size of the damage zone is used for theoretical calculations of the mechanical energy release from micro-failure processes. A correlation of the AE energy-release rates with the mechanical energy-release rates from participated failure mechanisms like matrix cacking, fibre/matrix debonding and fibre breakage is presented. KW - Polymer blends KW - Polymer-matrix composites KW - Fracture toughness KW - Delamination KW - Acoustic emission PY - 2000 U6 - https://doi.org/10.1016/S0266-3538(00)00060-9 SN - 0266-3538 VL - 60 SP - 1213 EP - 1226 PB - Elsevier CY - Barking AN - OPUS4-4155 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Bohse, Jürgen A1 - Chen, J.H. T1 - Acousitc Emission Examination of Mode I, Mode II and Mixed-Mode I/II Interlaminar Fracture of Unidirectional Fiber-Reinforced Polymers PY - 2001 SN - 0730-0050 VL - 19 SP - 1 EP - 10 PB - Acoustic Emission Group CY - Los Angeles, Calif. AN - OPUS4-4157 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Bohse, Jürgen T1 - Acoustic emission examination of polymer-matrix composites PY - 2004 SN - 0730-0050 VL - 22 SP - 208 EP - 223 PB - Acoustic Emission Group CY - Los Angeles, Calif. AN - OPUS4-6944 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Bohse, Jürgen A1 - Mair, Georg A1 - Novak, Pavel ED - Pullin, R. ED - Holford, M. T1 - Acoustic emission testing of high-pressure composite cylinders T2 - 27th European Conference on Acoustic Emission Testing (EWGAE 2006) CY - Cardiff, Wales, UK DA - 2006-09-20 KW - Composite calinders KW - Pressure equipment KW - Damage analysis PY - 2006 SN - 0-87849-420-0 N1 - Serientitel: Advances materials research – Series title: Advances materials research IS - 13-14 SP - 267 EP - 272 PB - Trans Tech Publ. CY - Zürich AN - OPUS4-13865 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Bohse, Jürgen T1 - Acoustic emission for non-destructive evaluation of composites T2 - Structural Composites Conference, Applications in Corrosion Prevention, Transportation, Defense and Infrastructure CY - Birmingham, AL, USA DA - 2006-02-08 PY - 2006 SP - 1 EP - 30(?) PB - American Composites Manufactures Association (ACMA) CY - Birmingham, USA AN - OPUS4-13904 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Bohse, Jürgen T1 - Vom SE-Quellenmechanismus zum SE-Signal T2 - AT3-Seminar CY - Puchberg am Schneeberg, Austria DA - 2005-10-21 PY - 2005 AN - OPUS4-11362 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Bohse, Jürgen T1 - Interpretation von Schallemissionssignalen bei faserverstärkten Polymeren T2 - 15. Kolloquium Schallemission CY - Berlin, Germany DA - 2005-11-17 PY - 2005 AN - OPUS4-11363 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Bohse, Jürgen T1 - Discrimination of acoustic emission source mechanisms T2 - ICEAF III - 3rd International conference of engineering against failure CY - Kos, Greece DA - 2013-06-26 KW - Acoustic emission KW - Wave modes KW - Signal analysis KW - Source mechanisms PY - 2013 SN - 978-960-88104-3-3 SN - 2241-5890 SP - 316 EP - 324 AN - OPUS4-28827 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Wachsmuth, Janne A1 - Bohse, Jürgen T1 - Schallemissionsanalyse von Schadensmechanismen an Feinkornstahl N2 - In dieser Arbeit werden geschweißte Platten aus dem Feinkornstahl P460NL1 untersucht. Korrosion und Ermüdungsrisswachstum werden als Schadensmechanismen in das Material eingebracht und auf ihre Nachweisbarkeit in Plattenversuchen geprüft. Die Schallemissionssignale wurden nach primären und sekundären Quellmechanismen getrennt und ihr Einfluss auf die Gesamtemission analysiert. T2 - 18. Kolloquium Schallemission CY - Wetzlar, Deutschland DA - 2011-10-27 KW - Schallemissionsprüfung KW - Ermüdungsrisswachstum KW - Korrosion PY - 2011 SN - 978-3-940283-37-5 IS - DGZfP-BB 131 (Vortrag 10) SP - 1 EP - 9 AN - OPUS4-24662 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Wachsmuth, Janne A1 - Bohse, Jürgen T1 - Schallemissionsanalyse von Schadensmechanismen an Feinkornstahl N2 - In dieser Arbeit werden geschweißte Platten aus dem Feinkornstahl P460NL1 untersucht. Korrosion und Ermüdungsrisswachstum werden als Schadensmechanismen in das Material eingebracht und auf ihre Nachweisbarkeit in Plattenversuchen geprüft. Die Schallemissionssignale wurden nach primären und sekundären Quellmechanismen getrennt und ihr Einfluss auf die Gesamtemission analysiert. T2 - DGZfP-Jahrestagung 2011 CY - Bremen, Germany DA - 30.05.2011 PY - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:b43-248902 SN - 978-3-940283-33-7 IS - DGZfP-BB 127 (Di.2.C.2) SP - 1 EP - 8 PB - Deutsche Gesellschaft für Zerstörungsfreie Prüfung (DGZfP) AN - OPUS4-24890 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -