Abstract
This essays aims at introducing the setup for the multi-scale in-situ test system which is applied for the fatigue crack initiation test. The setup of the experiment system is first introduced, including the image capturing system, optical path system, image acquisition and storage system and the three-axis mobile platform. Then the preparation of micro speckle and the corresponding technique for spatial adjustment are improved to realize the DIC measurement in micro scale. Finally three experiments from macro-meso scale to macro scale: fatigue initiation test, the observation of micro crack and the fatigue crack growth rate in macro scale were conducted to verify the application of the system. The test result can indicate the location of crack initiation, the crack growth rate and the evolution of displacement/strain field, etc.
Highlights
Fatigue is the main cause of failure of engineering structures and components
The fatigue damage of metal is composed of multiple process which is generally divided into the following stages: 1) the accumulated damage caused by the change in microstructure; 2) the nucleation of micro crack; 3) the crack growth of micro crack and formation of main crack; 4) the crack growth; 5) fracture [1]
The surface replica is used for the study of small crack growth[2,3,4]; the compliace method and potential drop method are applied to monitor the length of long crack[5,6,7] ; the in-situ SEM methods are used to investigate the initation of crack [8,9]
Summary
Fatigue is the main cause of failure of engineering structures and components. The fatigue damage of metal is composed of multiple process which is generally divided into the following stages: 1) the accumulated damage caused by the change in microstructure; 2) the nucleation of micro crack; 3) the crack growth of micro crack and formation of main crack; 4) the crack growth; 5) fracture [1]. The surface replica is used for the study of small crack growth[2,3,4]; the compliace method and potential drop method are applied to monitor the length of long crack[5,6,7] ; the in-situ SEM methods are used to investigate the initation of crack [8,9]. A new experimental setup which can realize the in-situ multi-measurement based on the hydraulic fatigue testing machine is proposed
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