《Composites》1990,21(2):155-168

Instrumented drop weight impact and compression after impact test methods were used to assess the impact performance and damage tolerance of film-stacked, woven carbon fibre-reinforced PEEK and woven carbon fibre-reinforced PPS composite systems. The tests were performed at three energy levels with a constant velocity, and at three velocity levels with a constant energy. Extreme energy levels were also determined. While the effect of the impact velocity was found to be insignificant within the range of the velocities used, the impact energy significantly affected the impact performance of the panels. Carbon fibre PPS panels evinced a high resistance to perforation byway of extensive delamination. On the other hand, carbon fibre PEEK panels showed an ability to confine the damage zone and hence, to markedly increase the damage tolerance of the panels. A set of material selection criteria for impact applications, based on the results of this study, has been proposed.  相似文献   

    

《Engineering Applications of Artificial Intelligence》2005,18(5):513-531

This article develops a systems- and control-oriented intelligent agent framework called the hybrid intelligent control agent (HICA) and describes its composition into multiagent systems. It is essentially developed around a hybrid control system core so that knowledge-based planning and coordination can be integrated with verified hybrid control primitives to achieve the coordinated control of multiple multi-mode dynamical systems. The scheme is applied to the control of a team of unmanned ground vehicles (UGVs) engaged in an outdoor terrain mapping task. Results are demonstrated experimentally.  相似文献   

    

Yuan Mei  Dao-Kui Li  Shi-Ming Zhou  Zhi-Bin Shen  Wei-Jing Wu 《Propellants, Explosives, Pyrotechnics》2023,48(3):e202200309

A method for identifying the relaxation modulus or creep compliance of composite propellant based on indentation technique is proposed, which can rapidly and nondestructively measure the mechanical properties of solid rocket motor grain in storage. According to viscoelastic indentation theories, a constitutive model for conical indentation is derived to predict the mechanical parameters of composite propellants. The indentation test with different loading rates and the traditional tensile stress relaxation test for a certain PBT composite propellant were carried out to verify the feasibility of the proposed method. The results show that the prediction results calculated by the constitutive model are in good agreement with the load-displacement curves of the indentation test, and the mechanical parameters identified by the constitutive model are similar to those parameters fitted by the tensile stress relaxation test. Relevant methods and conclusions can provide a reference for structural analysis and storage life prediction of solid rocket motors.  相似文献