Reliability Analysis of Brittle, Thin Walled Structures

Jonathan A Salem and Lynn Powers

关键词: BUILDUP;    CERAMICS;    DESIGN;    MULLITE;    NASA;    PARTICULATES;    REGULATIONS;    RELIABILITY;    SOOT;    STRESSES;    TESTING;    THERMAL SHOCK;    US EPA Reliability;    life prediction;    ceramics;    diesel;    filter;    strength;    fracture toughness;   

DOI  :  10.2172/899161
RP-ID  :  ORNL diesel particulate
PID  :  OSTI ID: 899161
Others  :  Other: NASA SAA3-719
Others  :  TRN: US200717%%472

学科分类：工程和技术（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

One emerging application for ceramics is diesel particulate filters being used order to meet EPA regulations going into effect in 2008. Diesel particulates are known to be carcinogenic and thus need to be minimized. Current systems use filters made from ceramics such as mullite and corderite. The filters are brittle and must operate at very high temperatures during a burn out cycle used to remove the soot buildup. Thus the filters are subjected to thermal shock stresses and life time reliability analysis is required. NASA GRC has developed reliability based design methods and test methods for such applications, such as CARES/Life and American Society for Testing and Materials (ASTM) C1499 “Standard Test Method for Equibiaxial Strength of Ceramics.”