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Risk of fatigue failure exists in the tube trailer cylinders under the condition of internal pressure variation and inertial load caused through road transport. In order to estimate the safety state of the cylinders under the action of alternating load, the model of certain geometry sizes is built based on the widely used tube trailer cylinders. The fatigue analysis of tube trailer gas cylinders is made aiming at the action of the internal pressure and the inertial load. The fatigue life distribution of cylinders is obtained under the condition of different loads through the numerical simulation by ANSYS Workbench. The analysis results show that under internal pressure, gas cylinders have limited fatigue life, but can satisfy the requirements; when the inertial load exceeds a certain value, natural gas cylinders of tube trailer is under finite life state, which does not meet the requirements of strength, therefore the inertial load should be controlled. [ABSTRACT FROM AUTHOR]

By using finite element software ANSYS, the stress of the annular sector semicircular cross section vessel, which is made up of an annular sector plate, two semicircular plates and a semi-cylindrical with the thicknesses of 20 mm, is analyzed. The analysis results show that the maximum equivalent stress of the annular sector plate appears in the middle of the plate, and the maximum equivalent stresses of the semicircular plate and the semi-cylindrical appear in the inner surface connection place. The equivalent stress distribution trends of the annular sector plate, semicircular plates and the semi-cylindrical are obtained. Meanwhile, the equivalent stresses and the sizes of the high stress areas and stress-stable areas in the annular sector plate and semi-cylindrical inner and outer surface areas are obtained. The research result provides a reference for the design of annular sector semicircular cross section vessel. [ABSTRACT FROM AUTHOR]