Title

Time Dependent Mechanical Properties Of Zrb2-Sic Ceramic Composites: Room Temperature Fatigue Parameters

Keywords

Cyclic fatigue; Mechanical behavior; Static fatigue; Strength; ZrB -30 wt% SiC ceramic composite 2

Abstract

Room temperature fatigue of ZrB2-30 wt% SiC ceramic composite has been studied. The linear regression technique, proposed by Fett and Munz, was used to determine the static and cyclic fatigue parameters of ZrB2-30 wt% SiC ceramic composite tested in dry air, air with 40% humidity, and water at room temperature. It was found that cracks grow much faster under cyclic test conditions in comparison with constant static loading. This phenomenon can be attributed to (1) the degradation of bridging interactions between the two growing crack surfaces; and (2) a corresponding decrease in shielding stress intensity factor. When cyclic fatigue experiments were performed in water in comparison with the results obtained in air, it was also found that crack grows much faster under 100% of humidity. It was determined that water molecules increase the crack propagation rate in ZrB2-30 wt% SiC composite. The lifetime of the material decreases from 18 hours at σ = 580 MPa static loading in air to 5.5 minutes at Δσ = 1200 MPa cyclic loading in air and 0.4 seconds at Δσ= 1240 MPa cyclic loading in water.© 2014 by American Scientific Publishers.

Publication Date

4-1-2014

Publication Title

Science of Advanced Materials

Volume

6

Issue

4

Number of Pages

844-852

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1166/sam.2014.1792

Socpus ID

84894562964 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84894562964

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