چكيده به لاتين
Due to the wide usage of energy absorption in various industries such as automotive, aerospace and military components are very important. In these structures to increase safety and improve crashworthiness value must increase energy absorption and at the same time reduce the mass of the structure . In the present thesis the modeling - numerical study of impact objectives composite pyramid thin-walled absorbent fillings functionally graded foam are discussed . First , a steel pyramid thin-walled absorbent that experimental tests were did on it , modeling Abaqus software and validation in two cases contain no foam and foam were used. Modeling hit by a blow (a mass cube) that was moving horizontally. The absorbent material in FRP composite and the foam into functionally graded materials have changed. At this stage, the results were compared with the initial results. In the next step, using MATLAB optimization performed on absorbent. Conclusions show that by adding foam to absorb higher energy is also much less adsorbent in composite material made of conventional metals used . . By changing the absorbent material from steel to the CFRP composite material, as well as the use of functional graded foam, the amount of adsorbent decreased by an average of 40%. After optimizing the absorbed energy, it increased by an average of 10%, eventually the absorbed energy increased by 25% compared to the original state and increased by 70%. This increase was due to increased energy absorption and reduction The absorbing mass is simultaneous.
