Hysteretic energy dissipation in aluminium matrix syntactic foam under intermittent cyclic compression



Zhang, Y and Zhao, Y ORCID: 0000-0003-2356-8435
(2019) Hysteretic energy dissipation in aluminium matrix syntactic foam under intermittent cyclic compression. Materialia, 6.

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Abstract

© 2019 Metal matrix syntactic foams with an Al 6082 matrix and hollow SiO 2 -Al 2 O 3 microspheres were fabricated by infiltration casting. The energy absorption behaviours of the syntactic foams under monotonic, intermittent cyclic and two-stage repetitive cyclic compression conditions were studied. The compressive strength, yield strain and plateau stress are mainly dependent on the CM particle size and are less sensitive to the CM volume percentage. The specific dissipated energy under cyclic loading is mainly dependent on the loading stress and is proportional to the square of stress. Each syntactic foam has a nearly constant hysteretic specific damping capacity, which is proportional to the CM volume percentage but is not sensitive to the CM particle size. The cyclic loading history has an influence on the hysteretic energy dissipation. If the stress level is below the maximum stress experienced in the previous cycles, the specific dissipated energy and specific damping capacity are much lower than those measured at the same stress in previous cycles. The hysteretic energy dissipation is caused by microcrack formation and propagation in the CM particles. The accumulation of crack development leads to CM particle fracture, which results in a small permanent plastic deformation.

Item Type: Article
Depositing User: Symplectic Admin
Date Deposited: 25 Mar 2019 10:36
Last Modified: 01 Oct 2021 07:13
DOI: 10.1016/j.mtla.2019.100286
URI: https://livrepository.liverpool.ac.uk/id/eprint/3034860