Papers by Author: Jing Wu

Abstract: The destruction mechanism of carbon fiber cement was studied by Scanning Electron Microscopy with single fiber pull-out testing. The result showed that the interfacial strain increasing is accompanied with fiber pull-out, fiber fracture and interfacial debonding, which provides a basis for the analysis of numerical simulation.

Abstract: Based on the single fiber pull-out testing, the resistance of carbon fiber cement increases during the tensile test in elastic stage. Through the experiment, The fiber embedded length shorter, sample pullout strength is greater. But the resistance change rate is smaller, the lower the sensitivity of the sample. So, considering the fiber length and interface set interface effect of carbon fiber reinforced cement based composite resistance model. A simple model was proposed to explain the mechanism of compression sensitivity of carbon fiber reinforced cement-based composites based on interface effect. The results showed that the content of carbon fiber and interface strain can change the sensitivity of CFRC.

Abstract: The carbon fiber cement has compression sensibility. In this paper, the compression sensitivity of carbon fiber concrete is analyzed by Scanning Electron Microscopy with single fiber pull-out testing. Results show that the resistance of carbon fiber cement increases during the tensile test, the fractional change in resistance per unit strain of The carbon fiber cement is 38.38±0.05. In the meantime, the variation of resistance of single fiber pull-out under cyclic loading was studied. The resistance change caused by the elastic deformation is reversibility.

Abstract: AC servo system catches scholars and researchers’ more attentions. A fuzzy PID control strategy is proposed to the AC servo system. Using critical proportioning method to adjust the PID parameter, building two dimension fuzzy controllers to adjust the parameter and compensate the rotational speed. Analysis of simulation experiment of PID and incremental Fuzzy PID control, the result shows that the validity of the method.

Abstract: By use of the mixed layerwise theories and the interpolation functions of displacements and transverse stress, the dynamics equations of viscoelastic stiffened laminated cylindrical shells with an unconstrained fiber-reinforced layer were derived. The predicted vibration frequency and loss factor show the good agreement with the A.Okazaki’ experimental results for the two-layer cylindrical shells. The non-dimensional frequencies and loss factors were computed for different Young’s modulus and thickness of viscoelastic layer. The results show that using a higher module and thickness viscoelastic layer can effectively increase the loss factors; moreover, using a circular-reinforced viscoelastic layer has little effect on the non-dimensional frequencies, but can effectively increase the model loss factors.