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Stress Concentration Factors Assignment

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DEPARTMENT OF MECHANICAL ENGINEERING

KCEC3107 (FINITE ELEMENT ANALYSIS)

LAB TITLE:
STRESS CONCENTRATION FACTORS ASSIGNMENT

LECTURER: MR JUDHA PURBOLAKSONO
NAME: DEWI RATIH BINTI MOHAMED RAZZ ROZZMAN
MATRIC NO: KEC110007

Assignment Question
Produce stress concentration factors for the following geometry by using FEM (ANSYS). The stress concentration factor will have three different ratios of D/d; each D/d will have at least four different values of r/d. Please compare the findings with those in available charts of stress concentration factors. Discuss your finding. The submission will be in the form of a brief report in PDF or MS Word.

Assignment Answer
Table1.1
Ratio, r/d | Value of Kt | | Experimental D/d, 2.0 | Experimental D/d, 1.5 | Experimental D/d, 1.2 | Ideal D/d, 2.0 | Ideal D/d, 1.5 | Ideal D/d, 1.2 | 0.05 | 2.06 | 2.10 | 2.01 | 2.87 | 2.66 | 2.37 | 0.10 | 2.03 | 1.99 | 2.00 | 2.28 | 2.1 | 1.96 | 0.15 | 1.84 | 1.89 | 1.81 | 2 | 1.87 | 1.76 | 0.20 | 1.73 | 1.83 | 1.76 | 1.84 | 1.73 | 1.63 |

Figure 1.1

D/d=2 | Ratio, r/d | | 0.05 | | 0.10 | | 0.15 | | 0.20 |

D/d=1.5 | Ratio, r/d | | 0.05 | | 0.10 | | 0.15 | | 0.20 |

D/d=1.3 | Ratio, r/d | | 0.05 | | 0.10 | | 0.15 | | 0.20 |

In design under fatigue loading, stress concentration factor is used in modifying the values of endurance limit while in design under static loading it simply acts as stress modifier. This means Actual stress= t k × calculated stress. For ductile materials under static loading effect of stress concentration is not very serious but for brittle materials even for static loading it is important.
From the Table 1.1 and Figure 1.1, there are slightly different of experimental data when compared to the theoretical (ideal) data. The experimental data are collected after do simulation of stress analysis using ANSYS APDL.
All value of experimental data is slightly lower than the theoretical value. The gradient of the curve is slightly smaller from the theoretical curve and the value in (r/d) is smaller than the ideal as well.

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