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Measuring system of the advancing crack length at the fatigue test has been developed using CCD sensor without stop the machine work. Two personal computers operate in its system to control machine work. First computer (PC1) controls the cyclic loading according to the setting maximum or minimum load, and interrupts to second computer (PC2) by using RS232C line at each setting number of cycles. Receive from PCl's interrupt signal, using GP-IB line, PC2 commands to read and write the video signal about crack image to digital memory and then sends the signal from it to memory of PC2. From data of memory of PC2, a graph of advanced crack length versus number of loading cycles and a log-log plots of da/dN versus delta K can be drawn.Under constant load, a-N plots become stepwise with number of loading cycles. During early crack development, one step corresponds to several cycles and finally one step corresponds to one cycle. On each stage, one step creates one striation line on the fracture surface. Also, the linear relationship between log-log plots of da/dN and delta K has verified.Under constant delta K, a-N plots become stepwise straight line and a log-log plots of da/dN versus delta K become one point for each experiment because da/dN is constant at each cycle.

STUDY ON MEASURING METHOD OF ADVANCING CRACK LENGTH OF TRANSPARENT PLASTICS BY CCD SENSOR DURING FATIGUE TEST