By M. J. Iremonger

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RIVET DIAMETER (MM) 0 TO STOP» -VE TO CHANGE PLATE DIMENSIONS? 3333 Z RIVET DIAMETER (MM) - 0 TO STOP» -VE TO CHANGE PLATE DIMENSIONS? 0 STOP AT LINE 220 READY Program notes (1) The load capacity of the plate (Fl) is calculated in line 160. (2) The input for rivet diameter enables the program to stop or the plate dimensions to be changed (lines 190 to 210). 3 Relation between elastic constants For an isotropic, linearly elastic material the elastic constants Young's modulus (E), shear modulus (G) and Poisson's ratio (v) are related by the equation E = 2G(l +i/) By differentiating this equation it is possible to relate the maximum errors in determining the constants.

0 : 29 : 50 10 PRINT "LOAD CAPACITY AND OPTIMUM RIVET SIZE· FOR SIMPLE JOINT" 20 PRINT " - - --- -·· ·- " 30 PRINT 40 PRINT "INPUT:" 50 PRINT "MAX ALLOWABLE SHEAR STRESS IN RIVET "? 60 INPUT Rl 70 PRINT "MAX ALLOWABLE TENSILE STRESS IN PLATE "» 80 INPUT PI 90 PRINT "MAX ALLOWABLE BEARING PRESSURE ON PLATE

44 5 07 10 PRINT "LEAST SQUARES ANALYSIS OF TORQUE-TWIST DATA" 20 PRINT "FOR A S (3 LI I) CIRCULAR TORSION SPECIMEN" 30 PRINT " - " 40 PRINT 50 PRINT "INPUT: " 60 PRINT "SPECIMEN DIAMETER (MM)*? 14159*D"4/32 90 PRINT "GAUGE LENGTH (MM)"? 100 INPUT L 110 PRINT "NUMBER OF DATA SETS (IE LOAD LEVELS)"? 14159*J> 320 PRINT "PREDICTED SHEAR MODULUS G IS"tGr"KN/MM"2" 330 STOP 1000 REM SUBROUTINE TO PERFORM LEAST SQUARES STRAIGHT LINE FIT 1010 REM USING N SETS OF DATA PAIRS X(I) AND Y(I) 1020 REM TO GIVE SLOPE INTERCEPT 1130 S4=S4+X(I)*X(I) 1140 NEXT I 1150 M=/(N*S4-S1*S1> 1160 C=(S2-M*S1)/N 1170 FOR 1=1 TO N 1180 S5=S5+(Y(I)-M*X(I>-C)~2 1190 NEXT I 1200 S5=SQR(S5/(N·2)) 1210 RETURN READY

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