Cracking Stress of Composite Ceramic Based on the Boundary Slip of Rod-shaped Eutectics

doi:10.3969/j.issn.1000-1093.2014.10.016

Abstract

Abstract: According to the organizatinal structure characteristics of eutectic composite ceramics, a prediction model of cracking stress is established, which provides theoretical foundation for analyzing the damage form of composite materials. The matrix of eutectic composite ceramics is mainly composed of rod-shaped eutectics with nano/micron fibers. A small amount of lamellar crystals and spherulites are distributed around the rod-shaped eutectics. Baesd on tensile stress transmitted by strong constraining interphase between fibers and matrix in the rod-shaped eutectics, a load-transmitting model is set up. On the basis of weak constraining interphase characteristics between rod-shaped eutectics or between rod-shaped and crystal particles around the rod-shaped eutectics, the shear stress on the surface of the rod-shaped eutectics is obtained by boundary slip conditions. Considering the random orientation of the rod-shaped eutectics, a theoretical expression of composite ceramic cracking stress is gotten based on the relationship between the applied strain of rod-shaped eutectics and the applied load of composite ceramics as the composite ceramics are subjected to tensile load. The results indicate that cracking stress is closely related to the diameter and volume fraction of nano/micron fiber. The cracking stress increases with the increase in fibers diameter and decreases with the increase in fibers volume fraction.

Key words: solid mechanics, eutectic composite ceramics, rod-shaped eutectics, interfacial shear stress, load-transmitting model, boundary slip, cracking stress

CLC Number:

O346

CHEN Cheng, NI Xin-hua, ZHANG Shu-qin, CHENG Zhao-gang. Cracking Stress of Composite Ceramic Based on the Boundary Slip of Rod-shaped Eutectics[J]. Acta Armamentarii, 2014, 35(10): 1625-1629.

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