Issue 13

Ahanchian Mohammad et alii, Frattura ed Integrità Strutturale, 13 (2010) 31-35 ; DOI: 10.3221/IGF-ESIS.13.04 34 S IMULATION BY ANSYS onsequently six different cases are discussed and each case is simulated by ANSYS to justify the accuracy of the written code in MathCAD. Some results are presented subsequently. The partial zoomed contour plots of ANSYS analysis of Von Misses stress distribution for the largest crack size subject to critical loading is presented in Fig 3.a. The result after imposing thermal condition to the previous situation is presented i n Fig 3.b. Figure 3 : Zoomed contour plots for maximum crack length (critical length), simulated by ANSYS, (a) Von Misses stress distribution subject to critical loading, (b) Von Misses stress distribution subject to critical loading and thermal condition. C OMPARING THE RESULTS OF CONVENTIONAL METHOD AND ANSYS SIMULATION n the first situation, the crack has the smallest length that is in two dimensional polar coordinate radius of crack tip is equal to the radius of core and the angle between crack tip and X direction had been assumed to be 15 degree. Critical force for this type of crack is -1.95 N; In this case maximum value for equivalent stress is 12.13 MPa, and is placed near the crack tip in Aluminum material. By adding thermal condition to applied force, maximum value for equivalent stress would be 12.02 MPa, which is lower than previous case. Figure 4 : Comparison of maximum Von Misses stress in different cases. C I