DIGITAL IMAGE CORRELATION STUDIES FOR FATIGUE MICRO-CRACK INITIATION AND PROPAGATION OF NI BASED SUPERALLOY  

作　　者：Dong Lei 1 Kefeng Wang Qing Zhang Pizhong Qiao (State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China) (College of Mechanics and Materials, Hohai University, Nanjing 210098, China) 

出　　处：《Acta Mechanica Solida Sinica》2011年第S1期79-84,共6页固体力学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (NSFC, Nos. 11002048, 10972072);the National Basic Research Program of China (973 Program, No. 2007CB714104);the Special Fund of State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering at Hohai University (No. 2009585912)

摘　　要：An experimental investigation on the mechanical mechanisms of fatigue micro-crack initiation and propagation of a nickel-based superalloy is presented. By coupling digital image correlation method and scanning electron microscope, the fatigue residual strain distribution at the grain scale has been obtained. The results showed that there is a trend of accumulation for the residual strain. Micro-cracks are more likely to initiate in or near the areas with particularly large residual strain, and propagate along the large-strain paths.An experimental investigation on the mechanical mechanisms of fatigue micro-crack initiation and propagation of a nickel-based superalloy is presented. By coupling digital image correlation method and scanning electron microscope, the fatigue residual strain distribution at the grain scale has been obtained. The results showed that there is a trend of accumulation for the residual strain. Micro-cracks are more likely to initiate in or near the areas with particularly large residual strain, and propagate along the large-strain paths.

关 键 词：nickel alloy digital image correlation fatigue residual strain MICRO-CRACK 

分 类 号：TG146.15[一般工业技术—材料科学与工程]