TY - GEN A1 - Müller, Bernd R. A1 - Ekenhorst, Derk A1 - Brzezinka, Klaus-Werner A1 - Hentschel, Manfred P. ED - Krenkel, W. T1 - Fiber Induced Failure of Carbon/Carbon Composites T2 - 4th International Conference on High Temperature Ceramic Matrix Composites ; 4th HT-CMC Conference CY - Munich, Germany DA - 2001-10-01 PY - 2001 SN - 3-527-30320-0 VL - 4 SP - 175 EP - 180 PB - Wiley-VCH CY - Weinheim AN - OPUS4-1289 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Harbich, Karl-Wolfram A1 - Hentschel, Manfred P. A1 - Ekenhorst, Derk A1 - Schors, Jörg A1 - Lange, Axel T1 - X-Ray Refraction for NDT of Micro Cracks and Impacts N2 - High performance composites and other light weight materials are generally a comple problem to the performance of nondestructive testing methods. X-ray refraction provide unconventional X-ray scattering techniques to meet the actual demand for improve nondestructive characterization of these advanced materials. Scanning the samples across collimated narrow incident X-ray beam permits to image integral micro-structures (a present) with a resolution of 10 µm. Investigations of samples after strain-induced micro cracks and fibre debonding in impact damaged epoxy are shown. The physics of X-ray refraction are analogous to the well known refraction of light b optical lenses and prisms, governed by Snell's law. The special feature is the deflection a very small angles of few minutes of arc, as the refractive index of X-rays in matter i nearly one. Due to the density differences at inner surfaces most of the incident X-rays ar deflected. As the scattered intensity of refraction is proportional to the specific surface of sample, a reference standard gives a quantitative measure for analytical determinations. Figure 1 represents a two-dimensional damage distribution of an impact in a 0/90° CFR laminate of 3 mm, thickness. Unlike in ultrasonic testing, there is no shadowing effect o the successive layers. By use of X-ray refraction the exact concentration of debonde fibres is calculated for each position. Additionally the refraction allows the selection of th fibre orientation. T2 - 7th European Conference on Non-Destructive Testing (ECNDT) CY - Copenhagen, Denmark DA - 1998-05-26 PY - 1998 UR - http://www.ndt.net/abstract/ecndt98/435.htm SN - 87-986898-0-0 VL - 3 CY - Broendy, Denmark AN - OPUS4-3328 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Hentschel, Manfred P. A1 - Lange, Axel A1 - Harbich, Karl-Wolfram A1 - Ekenhorst, Derk A1 - Schors, Jörg T1 - Röntgentopographische Verfahren - Zerstörungsfreie Charakterisierung moderner Werkstoffe PY - 1998 SN - 0025-5300 VL - 40 IS - 5 SP - 170 EP - 174 PB - Carl Hanser Verlag CY - München AN - OPUS4-3329 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Hentschel, Manfred P. A1 - Ekenhorst, Derk A1 - Harbich, Karl-Wolfram A1 - Lange, Axel A1 - Schors, Jörg ED - Green, R. E. T1 - New X-ray refractography for non-destructive evaluation of advanced materials T2 - 8th International Symposium on Nondestructive Characterization of Materials CY - Boulder, CO, USA DA - 1997-06-15 PY - 1998 SN - 0-306-45900-0 VL - 8 SP - 409 EP - 416 PB - Plenum Press CY - New York AN - OPUS4-3330 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Hentschel, Manfred P. A1 - Harbich, Karl-Wolfram A1 - Lange, Axel A1 - Schors, Jörg A1 - Ekenhorst, Derk A1 - Judd, M.D. A1 - Raynal, R. T1 - X-ray refraction characterizes leight weight materials PY - 1998 SN - 1018-8657 VL - 8 IS - 3 SP - 14 EP - 15 PB - European Space Agency CY - Noordwijk AN - OPUS4-3331 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Harbich, Karl-Wolfram A1 - Schors, Jörg A1 - Lange, Axel A1 - Ekenhorst, Derk A1 - Harwardt, Michael A1 - Hentschel, Manfred P. T1 - Röntgen-Refraktion von Werkstoffen - Zerstörungsfreie Charakterisierung von Mikro-Grenzflächen PY - 1997 SN - 0025-5300 VL - 39 IS - 7-8 SP - 302 EP - 307 PB - Carl Hanser Verlag CY - München AN - OPUS4-3663 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Hentschel, Manfred P. A1 - Harbich, Karl-Wolfram A1 - Ekenhorst, Derk A1 - Schors, Jörg T1 - Röntgentopographie der Faser- und Polymerorientierung PY - 1997 SN - 0025-5300 VL - 39 IS - 4 SP - 121 EP - 123 PB - Carl Hanser Verlag CY - München AN - OPUS4-3664 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Harbich, Karl-Wolfram A1 - Hentschel, Manfred P. A1 - Ekenhorst, Derk A1 - Schors, Jörg ED - Michel, B. T1 - X-ray refraction for nondestructive investigation of micro cracks and impacts T2 - 2nd International Conference and Exhibition Micro Materials CY - Berlin, Germany DA - 1997-04-16 PY - 1997 SN - 3-932434-05-6 VL - 1 SP - 1025 EP - 1027 PB - ddp Goldenbogen CY - Dresden AN - OPUS4-3662 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Hentschel, Manfred P. A1 - Ekenhorst, Derk A1 - Harbich, Karl-Wolfram A1 - Lange, Axel ED - Naslain, R. ED - Lamon, J. ED - Doumeingts, D. T1 - C-fibre degradation debonding and lamella buckling measurement in CMC by new X-ray topography T2 - 6th European Conference on Composite Materials ; 1st International Conference on High Temperature Ceramic Matrix Composites (HT-CMC1) CY - Bordeaux, France DA - 1993-09-20 PY - 1993 SN - 1-85573-143-6 VL - 1 SP - 245 EP - 250 PB - Woodhead CY - Cambridge AN - OPUS4-3647 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Hentschel, Manfred P. A1 - Ekenhorst, Derk A1 - Harbich, Karl-Wolfram A1 - Lange, Axel T1 - New X.ray refractography for nondestructive investigations T2 - International Symposium on Advanced Materials for Lightweight Structures CY - Noordwijk, Netherlands DA - 1994-03-22 PY - 1994 N1 - Serientitel: ESA WPP – Series title: ESA WPP IS - 70 SP - 661 EP - 664 PB - ESTEC Conference Bureau CY - Noordwijk AN - OPUS4-3652 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -