Non-uniform temperature distribution of turbine casing and its effect on turbine casing distortion

Stress analysis is essential for gaining an understanding of the factors affecting crack on turbine casing arising from temperature gradients. Hence, making determinations of temperature distribution on gas turbine casing is the first step in stress analysis. The next step is comparison of results with available thermography data related to the casing. In addition, stress and distortion distributions are presented for three test levels of working load on the casing. Comparison of stress concentrations at the eccentric pin hole and observed cracks in these locations validated evaluations for stress distribution.