Fig. 1 A decision tree for a maintenance plan involving three inspection activities More about this image found in A decision tree for a maintenance plan involving three inspection activitie...

Fig. 2 Finite width plate with a center crack More about this image found in Finite width plate with a center crack

Fig. 3 ( a ) Experimental data of crack length against the number of cycles plotted from Virkler dataset [ 22 ] and ( b ) the transformed data in terms of ln ( d a / d N ) against ln Δ K used to construct PC expansion More about this image found in ( a ) Experimental data of crack length against the number of cycles plotte...

Fig. 4 Relative MSE in PC predictions against data as the order of expansion increases: ( a ) SRCC matrix and ( b ) mean vector More about this image found in Relative MSE in PC predictions against data as the order of expansion incre...

Fig. 5 Evolution of marginals PDFs of ln ( d a / d N ) estimated from PC model More about this image found in Evolution of marginals PDFs of ln ( d a / d N ) es...

Fig. 6 Confidence bounds of simulated ln ( d a / d N ) against ln ( Δ K ) using the constructed PC model More about this image found in Confidence bounds of simulated ln ( d a / d N ) ag...

Fig. 7 ( a ) Exact response surface for E [ C ET ] and ( b ) the variation of E [ C ET ] with inspection intervals at an optimum value of t 1 More about this image found in ( a ) Exact response surface for E [ C ET ] and ( b ) the...

Fig. 8 Response surface E [ C ET ] reconstructed with Gaussian process regression model More about this image found in Response surface E [ C ET ] reconstructed with Gaussian p...

Fig. 9 ( a ) Exact response surface of P f max and ( b ) response surface of P f max reconstructed with Gaussian process regression model More about this image found in ( a ) Exact response surface of P f max and ( b ) response ...

Fig. 1 Geometric configuration of the problem More about this image found in Geometric configuration of the problem

Fig. 2 Division of the FGM strip into substrips More about this image found in Division of the FGM strip into substrips

Fig. 3 Comparison between existing outcomes [ 17 ] and present outcomes for mode I and II DSIFs about the crack tip a 0 and b 0 under specified conditions More about this image found in Comparison between existing outcomes [ 17 ] and present outcomes for mode I...

Fig. 4 Influence of the number of substrips on normalized expectation More about this image found in Influence of the number of substrips on normalized expectation

Fig. 5 Influence of the number of substrips on normalized standard deviation More about this image found in Influence of the number of substrips on normalized standard deviation

Fig. 6 Influence of functionally graded parameter on normalized expectation More about this image found in Influence of functionally graded parameter on normalized expectation

Fig. 7 Influence of functionally graded parameter on normalized standard deviation More about this image found in Influence of functionally graded parameter on normalized standard deviation...

Fig. 8 Influence of FGM strips' thickness on normalized expectation More about this image found in Influence of FGM strips' thickness on normalized expectation

Fig. 9 Influence of FGM strips' thickness on normalized standard deviation More about this image found in Influence of FGM strips' thickness on normalized standard deviation

Fig. 10 Influence of a 0 on normalized expectation More about this image found in Influence of a 0 on normalized expectation

Fig. 11 Influence of a 0 on normalized standard deviation More about this image found in Influence of a 0 on normalized standard deviation