Zhang Weifang

Compensation Heating Technique for Experimental Investigation of Thermal Contact Conductance across GH4169/K417 Interface

Abstract An experimental apparatus to measure the thermal contact conductance (TCC) between interfaces of two contact solid materials was introduced, and a new compensating heater was proposed to better achieve the one-dimensional axial heat transfer. A practical engineering example was used with pressed pairs of GH4169/K417 contacts in the range 160∼280 °C and 60∼180 MPa to demonstrate the applicability of the experimental apparatus. The measured values of TCC with and without compensation heater were studied and compared. The results show that the measured TCC with compensation heater is larger than that without compensation heater under the same condition and the compensation heater works better at high temperature.

Prediction method of longitudinal tensile strength for unidirectional composites with interphase

Based on the traditional shear-lag model, using hierarchical multi-scale approach to research the tensile strength of fiber-reinforced composite. In this method, the tensile strength of carbon fibers is described by Weibull function, and a Monte-Carlo progressive failure model is established to analyze the longitudinal tensile strength of unidirectional composite materials, and we use this model to analyze the influence of micro parameter on the macro properties of fiber-reinforced composites, such as thermal residual stress and strength of interphase. The model can be used to predict macro-performance of fiber-reinforced composites and can give a reference for composite design and optimization.