| dc.description.abstract | Boilers and pressure vessels with riveted joints are used to contain
pressurized fluids and are subjected to complex loads under static, dynamic
and creep situations. Pressure vessel failure happens both circumferentially
and longitudinally. Circumferential riveted joints are critical to the design of
pressure vessels because the circumferential stress is double the longitudinal
stress. Boiler shell with circumferential riveted joints is studied at pressures
between 2.5 MPa and 5 MPa for structural analysis. Boiler shell with
circumferential riveted joints is studied at pressures 2.5 MPa and varying
temperature (300 °C, 400 °C, and 450 °C) for creep analysis. The riveted
joint was created with SolidWorks software and Ansys software. The
proposed joint is investigated to examine how structural steel, titanium alloy,
and nickel-cobalt-chromium alloy affect the vessel's performance. The
results are displayed, and a comparison is made in order to determine which
material is the best. Static results indicate that Boiler shell joints of nickel cobalt-chromium alloy have a smaller total deformation (0.067mm) and
lower Von-misses stress (63.37MPa) than structural steel and titanium alloy
at an internal pressure (2.5 MPa). The Maximum shear stress of titanium
alloy (30.63 MPa) shows better result as compared to Structural steel (33.52
MPa) and Nickel-Cobalt-Chromium alloy (34.11 MPa). Data for fatigue life,
damage, safety factor and sensitivity for candidate materials are provided by
Ansys software. The findings demonstrate that the boiler shell with
circumferential riveted joint of Titanium alloy has a good fatigue life, low
fatigue damage, and a high safety factor at high internal pressure when
compared to the circumferential riveted joint of structural steel, Nickel cobalt-chromium alloy. The final result shows that selected materials will
survive and function well, while titanium alloy and nickel-cobalt-chromium
alloy surpass structural steel. From the Creep analysis equivalent creep strain
of structural steel at constant load (2.5MPa) and varying temperature (300
°C, 400 °C and 450 °C) are 0.0016895, 7.2834e-6, and 6.2525e-5
respectively. The finding demonstrates that the best load range for greater
creep life of structural steel was shown to be 2.5 MPa, and the optimum
temperature range was discovered to be 4500 C. The final result demonstrates
that as the temperature is gradually increased to its maximum limit, the creep
strain rate of the specified material (structural steel) increases or decreases | en_US |
