o 4 o -I o O 03p f 4 *o~ O~D~: is w (Inch) Figure B-2. Contour plot of probability of failure design response surface approximation and test points along the curve of target reliability. The negative values of probability of failure are due to the interpolation errors of the design response surface approximation 5-4 45-~ 4- 15 2 25 3 w (Inch) Figure B-3. Contour plot of safety index design response surface approximation and test points along the curve of target reliability