Author : National Aeronautics and Space Adm Nasa
Publisher : Independently Published
ISBN 13 : 9781724066138
Total Pages : 32 pages
Book Rating : 4.0/5 (661 download)
Book Synopsis Effect of Load Rate on Ultimate Tensile Strength of Ceramic Matrix Composites at Elevated Temperatures by : National Aeronautics and Space Adm Nasa
Download or read book Effect of Load Rate on Ultimate Tensile Strength of Ceramic Matrix Composites at Elevated Temperatures written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-09-26 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: The strengths of three continuous fiber-reinforced ceramic composites, including SiC/CAS-II, SiC/MAS-5 and SiC/SiC, were determined as a function of test rate in air at 1100 to 1200 C. All three composite materials exhibited a strong dependency of strength on test rate, similar to the behavior observed in many advanced monolithic ceramics at elevated temperatures. The application of the preloading technique as well as the prediction of life from one loading configuration (constant stress-rate) to another (constant stress loading) suggested that the overall macroscopic failure mechanism of the composites would be the one governed by a power-law type of damage evolution/accumulation, analogous to slow crack growth commonly observed in advanced monolithic ceramics. It was further found that constant stress-rate testing could be used as an alternative to life prediction test methodology even for composite materials, at least for short range of lifetimes and when ultimate strength is used as the failure criterion. Choi, Sung R. and Gyekenyesi, John P. Glenn Research Center NASA/TM-2001-211125, NAS 1.15:211125, E-12975