A method for hardness measurement and evaluation of double-layer thin films on the material surface is proposed. Firstly, it is studied how to obtain the force-indentation response with the finite element method when...A method for hardness measurement and evaluation of double-layer thin films on the material surface is proposed. Firstly, it is studied how to obtain the force-indentation response with the finite element method when the indentation is less than 100 nanometers, in which current nanoindentation experiments have no reliable accuracy. The whole hardness-displacement curve and fitted equation are obtained. At last, a formula to predict the hardness of the thin film on the material surface is derived and favorably compared with experiments.展开更多
Single input/single output (SISO), single input/multi output(SIMO) multi input/ multi output (SIMO) control laws for activeflutter suppression are designed and realized wind tun- nel tests.Reasonable agreement between...Single input/single output (SISO), single input/multi output(SIMO) multi input/ multi output (SIMO) control laws for activeflutter suppression are designed and realized wind tun- nel tests.Reasonable agreement between analytical and tested results isachieved. Based on these re- sults, the distribution of responsemeasuring points and piezoelectric actuators is investigated.展开更多
基金Chinese Academy of Sciences Foundation (KGCX1-11) N ational Natural Science Foundation of China (10 2 3 2 0 5 0 ) Min-istry of Science and Technology Foundation (2 0 0 2 CB412 70 6)
文摘A method for hardness measurement and evaluation of double-layer thin films on the material surface is proposed. Firstly, it is studied how to obtain the force-indentation response with the finite element method when the indentation is less than 100 nanometers, in which current nanoindentation experiments have no reliable accuracy. The whole hardness-displacement curve and fitted equation are obtained. At last, a formula to predict the hardness of the thin film on the material surface is derived and favorably compared with experiments.
文摘Single input/single output (SISO), single input/multi output(SIMO) multi input/ multi output (SIMO) control laws for activeflutter suppression are designed and realized wind tun- nel tests.Reasonable agreement between analytical and tested results isachieved. Based on these re- sults, the distribution of responsemeasuring points and piezoelectric actuators is investigated.
