TY - JOUR A1 - Rajendran, R. A1 - Petley, V. A1 - Rehmer, Birgit T1 - Dynamic elastic properties of aero-engine metallic isotropic materials N2 - Study of elastic properties of aero-engine metallic materials is of paramount importance because it forms one of the foundations of engineering design of components. Nine isotropic aero-engine metallic materials were studied for their elastic properties for a temperature range varying from ambient to operating limit. Test was carried out in vacuum to prevent oxidation of specimens. Dimensional corrections of the specimen due to thermal expansion were taken into account. Dynamic elastic modulus was evaluated as the average of the moduli that was obtained through first flat and edge flexural mode frequencies. Dynamic shear modulus was established through the first torsional mode of frequency. KW - Dynamic elastic modulus KW - Dynamic shear modulus PY - 2012 UR - http://pil.sagepub.com/content/early/2012/07/17/1464420712454071.full.pdf+html DO - https://doi.org/10.1177/1464420712454071 SN - 2041-3076 SN - 1464-4207 SP - 1 EP - 7 PB - Sage Publ. CY - London AN - OPUS4-26237 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Nies, Daniel A1 - Rehmer, Birgit A1 - Skrotzki, Birgit A1 - Vaßen, R. T1 - Damage characterization of thermal barrier coatings by acoustic emission and thermography N2 - Thermal barrier coatings allow increasing the operating temperature and efficiency of land-, sea-, or air-based turbines. As failure of the coating may result in serious damage of the turbine, reliable estimation of its lifetime is essential. To assess the lifetime, cyclic tests are conceived to combine thermal loading by heating the surface of the coating with laser irradiation and nondestructive methods for damage determination. Using laser irradiation allows a high reproducibility of the thermal load. The temperature of the sample surface during thermal loading is determined by an infrared-camera which also enables the possibility to detect damage in the coating via thermography. Additionally, four acoustic sensors, attached to the experimental setup, are used to detect damage in the sample and determine the source of acoustic events. Results of acoustic emission correlate well with thermographic images that visualize the formation and evolution of damage through delaminations in the samples. PY - 2012 DO - https://doi.org/10.1002/adem.201200107 SN - 1438-1656 VL - 14 IS - 9 SP - 790 EP - 794 PB - Wiley-VCH Verl. CY - Weinheim AN - OPUS4-26536 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -