Damage evolution in AA2124/SiC metal matrix composites under tension with consecutive unloadings
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(2020) 20:135
ORIGINAL ARTICLE
Damage evolution in AA2124/SiC metal matrix composites under tension with consecutive unloadings A. Rutecka1 · M. Kursa2 · K. Pietrzak3 · K. Kowalczyk‑Gajewska2 · K. Makowska4 · M. Wyszkowski2 Received: 10 June 2020 / Revised: 11 September 2020 / Accepted: 26 September 2020 © The Author(s) 2020
Abstract Nonlinear properties of metal matrix composites (MMCs) are studied. The research combines results of loading–unloading tensile tests, microstructural observations and numerical predictions by means of micromechanical mean-field models. AA2124/SiC metal matrix composites with SiC particles, produced by the Aerospace Metal Composites Ltd. (AMC) are investigated. The aluminum matrix is reinforced with 17% and 25% of SiC particles. The best conditions to evaluate the current elastic stiffness modulus have been assessed. Tensile tests were carried out with consecutive unloading loops to obtain actual tensile modulus and study degradation of elastic properties of the composites. The microstructure examination by scanning electron microscopy (SEM) showed a variety of phenomena occurring during composite deformation and possible sources of elastic stiffness reduction and damage evolution have been indicated. Two micromechanical approaches, the incremental Mori–Tanaka (MT) and self-consistent (SC) schemes, are applied to estimate effective properties of the composites. The standard formulations are extended to take into account elasto-plasticity and damage development in the metal phase. The method of direct linearization performed for the tangent or secant stiffness moduli is formulated. Predictions of both approaches are compared with experimental results of tensile tests in the elastic–plastic regime. The question is addressed how to perform the micromechanical modelling if the actual stress–strain curve of metal matrix is unknown. Keywords Metal matrix composites · Tension with unloadings · Damage · Microstructure · Non-linear effective properties
1 Introduction Materials such as metal matrix composites (MMCs) during exploitation sustain nucleation and accumulation of defects called damage. Damage can lead to unexpected failure of a component made of the material and cause accident that may severely influence human health and life. There are methods that allow to observe and quantify damage accumulation during experimental tests on specimens manufactured * A. Rutecka [email protected] 1
Faculty of Civil Engineering, Warsaw University of Technology, Al. Armii Ludowej 16, 00‑637 Warsaw, Poland
2
Institute of Fundamental Technological Research (IPPT PAN), Pawińskiego 5B, 02‑106 Warsaw, Poland
3
Łukasiewicz Research Network - Institute of Precision Mechanics, Duchnicka 3, 01‑796 Warsaw, Poland
4
Motor Transport Institute, Jagiellońska 80, 03‑301 Warsaw, Poland
from materials. One of such basic tests in which material damage can be characterized and which is standard and necessary to perform for materials is tensile test. SiC particles are characterized by hi
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