Huasong Gou

Damping capacity of the Al matrix composite reinforced with SiC particle and TiNi fiber

Abstract Imitating the structure of steel-reinforced concrete, a composite coupling good damping capacity and mechanical property was fabricated by pressure infiltration progress. The aluminum (Al) matrix composite was hybrid reinforced by 20% volume fraction of SiC particle (SiCp) and 20% volume fraction of TiNi fiber (TiNif). The damping capacity of the composite in the temperature range from 30°C to 290°C was studied using a dynamic mechanical analyzer (DMA). Due to the B19′→B2 reverse martensitic transformation in TiNif, a damping peak showed up in the heating process. Furthermore, both the hysteretic effect of the martensite/variants interfaces in TiNif and the weak bonding interface between SiCp and TiNif were attributed to the high damping capacity of the composite. After tension deformation, a compressive stress was formed in the composite in the heating process. With the help of compressive stress, the value of the damping peak was much higher than before, since the movement of dislocation in the Al matrix was easier.

Strength prediction of tensile loaded graphite fiber-reinforced aluminum composites containing circular holes

The residual strength of fiber-reinforced aluminum composite (Grf/Al) with circular holes was investigated and predicted by four prediction methods, including PSC, AVC, DZC, and the ECGM. The ‘knee’ points in stress—strain curve and fracture surfaces of Grf/Al with holes were analyzed. In order to apply the ECGM method, the apparent fracture energy of Gr f/Al was determined through notched three-point bending test, which was 4.1 kJ/m2. All four models provided prediction with good accuracy while the ratio of diameter/width of Grf/Al specimen ranged from 0.05 to 0.2. Furthermore, ECGM showed better accuracy than DZC while predicting the residual strength at the whole range (0.05—0.5).The residual strength of fiber-reinforced aluminum composite (Grf/Al) with circular holes was investigated and predicted by four prediction methods, including PSC, AVC, DZC, and the ECGM. The ‘knee’ points in stress—strain curve and fracture surfaces of Grf/Al with holes were analyzed. In order to apply the ECGM method, the apparent fracture energy of Gr f/Al was determined through notched three-point bending test, which was 4.1 kJ/m2. All four models provided prediction with good accuracy while the ratio of diameter/width of Grf/Al specimen ranged from 0.05 to 0.2. Furthermore, ECGM showed better accuracy than DZC while predicting the residual strength at the whole range (0.05—0.5).