Measuring Crack Length in Coarse Grain Ceramics

Salem, Jonathan A. ; Ghosn, Louis J.

PID  :  NTRS Document ID: 20100017326
RP-ID  :  NASA/TM-2010-216242
RP-ID  :  E-17229

学科分类：材料科学（综合）

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

Due to a coarse grain structure, crack lengths in precracked spinel specimens could not be measured optically, so the crack lengths and fracture toughness were estimated by strain gage measurements. An expression was developed via finite element analysis to correlate the measured strain with crack length in four-point flexure. The fracture toughness estimated by the strain gaged samples and another standardized method were in agreement.