                    README FILE FOR CHAPTER-9 PROGRAM
                    ---------------------------------

    Programmes to implement stress separation by shear difference technique
    and oblique incidence methods for 2D problems are included here.

    To verify the algorithm implementation, sample data file is theoretically
    generated for a disc under diametral compression 
    (dia = 60.14mm, t = 6.28mm, material stress fringe value = 10.29 N/mm/fringe,
     diametral load = 669.4 N)

1.  shdiff.c
        This program is for stress separation by shear difference.
    
    User input
        choice of separation method
            1. Shear Difference (conventional)
            2. Shear Difference (Tesar)
        Enter input file name  
            (sdr.in for r/2 line and sdd.in for diametral line)
        Enter output file name
        Enter the value of fringe order and theta in degrees for starting 
            point on line of interest   (for r/2 line fringe order 0, theta 30 deg 
            and for diametral line fringe order 0, theta 90 deg)
        choice of relative position of the line
            1. Edge is straight ( all lines are of equal length)
            2. Edge is curved 
                a. Line of interest longer than line at the top
                b. Line of interest shorter than line at the top 

    output  : data file consist of sigma_x and sigma_y
    
    note -  Both input file consist of 
            - Number of data point including the point at the boundary 
            - deltaX, deltaY, Difference between line of interest line 
              above or below according to the case under consideration. 
            - for each node give data in order 
              n1 t1 n2 t2 n3 t3
              (put all values zero for boundry point as user is supplying this 
               data from key board)
              
              where
              n1= fringe order at the line above the line of interest 
              t1= theta(deg) at the line above the line of interest 
              n2= fringe order at the line of interest 
              t2= theta(deg) at the  line of interest 
              n3= fringe order at the line below the line of interest 
              t3= theta(deg) at the line below the line of interest 

        
2.  obliq2d.c
        This program for stress separation by oblique incidence.
    
    User input
        Enter input file name  (oblique.in)
        Enter output file name

    output  : data file consist of sigma_x, sigma_y and tow_xy
    
    note -  input file consist of 
            - Number of data point
            - angle of oblique incidence
            - Material stress fringe value and thickness
            - for each node give data in order 
              n1 t1 n2 
              where
              n1= fringe order for normal incidence
              t1= theta(deg) for normal incidence
              n2= fringe order for oblique incidence 
        
