Spherical Head And Oval-shaped Head Of Stress Measurement And Analysis Of Pressure Vessels

Dissertation focused on the key components of petroleum, chemical, light industry,transportation, food, pharmaceutical, metallurgy, textile and other traditional sectors requiredprocess equipment-pressure vessel research.Pressure vessel can be decomposed into the cylinder, head, seat, opening over, sealingdevices, safety accessories, and head of the role is to provide the necessary pressure space,depending on the geometry, head can be divided into spherical, oval, butterfly, ballcrown-shaped, conical shell cover, such as several of peace, in which spherical, oval, butterflyand ball crown-shaped head and collectively known as the convex head. At present, moreextensive use of convex head is spherical head and oval head, spherical head because of thesmall surface area per unit volume, and in diameter, wall thickness, and the same conditionsof work pressure stress minimum, equal to two-film stress and are uniformly distributed alongthe meridian. If the cylinder is connected and wall thickness equal to the maximum stress andstress near the edge of the film did not significantly different, etc. are widely used in highpressure, large diameter pressure vessel and the special needs of the occasion; rather ellipticalhead warp smooth continuous change in curvature, so the stress is distributed more evenly,while the depth of elliptical head is much smaller than the hemispherical head, easy-to-metalforming, is currently in the application of more low-pressure vessel head. Because of thepressure vessel has an irreplaceable role in the production, storage, transportation and otheraspects of all walks of life, therefore, to ensure the safety of pressure vessels at work on thespherical head and oval-shaped head study stress analysis and measurement topics is verynecessary.There are analytical methods, numerical methods, experimental stress method of stressanalysis. With the development of science and technology, new experimental stressmeasurement and analysis methods are emerging, such as electrical measuring method, photoelastic method, holographic photoelastic method, holographic interferometry, moire,speckle method is currently the most widely used is the electrical measuring method and thephotoelastic method. And this study will be analytical method, were measuring stress analysis,finite element analysis method, which combines experimental and theoretical, withexperiments to verify the theoretical analysis and the use of computer analysis methodscurrently being widely used.This is the study of the pressure drop a container and ovals letter of the observations andanalysis. the study are resolved, the test, finite element analysis, first of these differentmethods are the result of the have and will result in the analysis, and pointed out that twotypes of his head in actual usage should pay attention to problems..The two types of the headof state and structural characteristic is that two types of his head in the design pressure vesselis widely used, the bulb has a head of the uniform and stress minor points, but deep, theoverall stamp out of shape is; Oval letter of his depth is shallow, easy to stamp out of shape,and the situation in a letter to head, and other than a head.