Thermo mechanical behaviour of metal matrix composite structures

Abstract

Metal matrix composites offer a very good performance in a wide temperature range, but are limited to few applications due to high production costs. A novel compound extrusion process developed within the collaborative research centre SFB/TR 10, supported by the German Research Foundation (DFG -Deutsche Forschungsgemein-schaft), provides an economical production method for reinforced aluminium profiles. Using different reinforcement fractions it is possible to increase the strength of these components locally and to reduce the macroscopic coefficient of thermal expansion (CTE) and thus to tailor mechanical as well as thermal properties. For application in frame struc-tures, an efficient approach for sizing these properties is necessary, especially in regions with a 3D stress state. There-fore an approach is shown based on data gained analytically and with numerical analyses, allowing a dimensioning of cross sections required. The applicability of this approach is shown using a finite element (FE) model of a bent rein-forced aluminium profile. To verify the failure of the profile an own developed failure criterion was applied which is based on a test program, including classical tensile tests in direction of extrusion and perpendicular to it. Furthermore the process of biaxial testing of extruded profiles with small dimensions is shown.

Ballistic Response of Chromium/Chromium-Sulfide Cermets

“…A microstructural composite can be formulated by incorporating small particles or whiskers into a bulk metal, resulting in a particle-reinforced metal-matrix composite (MMC) that has material properties intermediate between the monolithic metal and the ceramic [16]. A general review of MMCs and their properties is presented by Ibrahim [17] and the effect of ceramic particle volume fraction and morphology is presented by Li and Ramesh [18].…”

Modal Shape Analysis Using Thermal Imaging

“…Razo et al (1995) make an interesting thermomechanical analysis of a specific material, patented by a private company. Other references, such as Lee et al (1993) and Wedekind et al (2010), mention the study of thermomechanical behavior focused on a mechanical manufacturing approach. Yang and Wang (2013) and Brinson (1993) address the issue from the perspective of intelligent materials such as shape memory alloys.…”