The dependence of damping capacity of PMMCs on strain amplitude
2000; Elsevier BV; Volume: 18; Issue: 2 Linguagem: Inglês
10.1016/s0927-0256(00)00100-2
ISSN1879-0801
AutoresJingfeng Wang, Z Zhang, Guoqing Yang,
Tópico(s)Numerical methods in engineering
ResumoAbstract For the particulate-reinforced metal–matrix composites (PMMCs), when the interface is considered as ideal, the damping mechanisms mainly come from two aspects. One is the intrinsic damping of component phase and the other is the energy dissipation caused by local micro-plastic deformation during external loading. According to this principle, the dependence of the damping capacity of SiC P /Al composite, at room temperature, on strain amplitude, has been simulated by employing cell method in this paper. The results show that the damping capacity of SiC P /Al composite is independent of the strain amplitude e 0 when e 0 is comparatively low. But, when the strain amplitude e 0 reaches a critical value e crit , the damping capacity increases rapidly with the strain amplitude e 0 . The results also show good coincidence to the model of G–L dislocation damping theory. It can be concluded that the dependence of the damping capacity on the strain amplitude e 0 is due to the energy dissipation caused by local micro-plastic deformation near the interface of Al/SiC for the difference of the elastic modulus.
Referência(s)