Experimental and analytical studies with finite elements was done on a polycarbonate transparent material as a forerunner to a similar study on transparent glass -epoxy composites

1. Determination of geometric stress intensity factor for a photoelastic compact tension specimen Me 823 project Presented by Anupam dhyani

8. Experimental Set-up Polarizer Testing machine Analyzer Specimen

10. Images at various loads 0 LOAD 80 N 90 N 100 N 110 N 120 N

12. APOGEE METHOD

13. Differencing method

14. Taylor series correction method (TSCM)

15. Analytical method ( ASTM- 399)

16. error chart 16.76 2.87 14.31 120 21.2 4 5.54 16.95 110 28.40 7.76 22.10 100 22.30 10.86 22.53 90 58.68 11.62 28.39 80 TSCM(% error) Differencing(% error) Apogee(% error) LOAD (Newton)

17. Comparison chart

19. Finite element modeling-initial mesh 2387 Elements

20. results 15.87 54.87 120 14.34 49.89 110 14.16 44.25 100 14.09 40.08 90 13.98 35.34 80 Error (%) K (Mpa  mm) LOAD (Newton)

21. Finite element modeling-next mesh

22. results 15.87 54.87 120 14.34 49.89 110 14.16 44.25 100 14.09 40.08 90 14.336 35.45 80 Error (%) K (Mpa  mm) LOAD (Newton)

23. Finite element modeling- final mesh 5228 Elements

24. results 15.67 53.8 120 14.29 49.87 110 14.49 44.35 100 14.99 40.16 90 14.98 35.50 80 Error (%) K (Mpa  mm) LOAD (Newton)

25. Finite element modeling- final mesh- refined 7642 Elements

26. results 15.87 54.87 120 14.34 49.89 110 14.16 44.25 100 14.09 40.08 90 14.336 35.45 80 Error (%) K (Mpa  mm) LOAD (Newton)

27. Comparison chart( all methods)