A Fork-shaped Ring Stress Diffusion Structure with Unequal-Thickness Wall and Its Design Method

Abstract

The invention discloses a non-equal-thick wall surface fork-shaped ring stress diffusion structure and a design method thereof, and belongs to the technical field of aerospace storage tanks. The fork-shaped ring stress diffusion structure is of an axisymmetric structure, and is mainly structurally characterized in a sectional configuration of the structure, wherein the sectional configuration mainly comprises a Y-shaped transition zone, a weld joint heat affected zone and a cylinder section zone. The non-equal-thick wall surface fork-shaped ring stress diffusion structure adopts a double-sidedstress homogenization method to determine the structural parameters of the sectional thickness, the axial stress of a weld zone is very uniform after optimization and is close to a pure axial tensionstate, and the load capacity of the storage tanks is greatly improved compared to the traditional design. The non-equal-thick wall surface fork-shaped ring stress diffusion structure and the design method thereof have the advantages that the problem of original weld design defects is solved, the problems of deformation coordination and stress effective diffusion of the novel composite structure of 'large-diameter fork-shaped ring, abnormal ring weld joint and large-diameter-thick-ratio cylinder wall' are creatively solved, and the structural design of the large-diameter launch vehicle storagetank fork-shaped ring structure is achieved.

Description

technical field [0001] The invention belongs to the technical field of aerospace storage tanks, and provides a fork-shaped ring stress diffusion structure with non-equal-thickness walls on the storage tank of a launch vehicle and a design method thereof. Background technique [0002] The fork ring, also known as the transition ring, is a key force transmission structure in the aerospace rocket body structure, connecting the bottom of the rocket fuel storage tank, the straight section, and the front and rear short shells. Under the joint action of axial pressure, bending moment and internal pressure, the stress state is extremely complex. The weld area is a dangerous area in the design of connecting structures such as rocket tank fork rings. For the calculation of weld strength, engineering algorithms are generally used in traditional structural design. According to the engineering algorithm, the tank is a thin-walled shell, the stress of the weld seam is basically membrane...

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Problems solved by technology

[0005] Aiming at the special and refined design requirements of large-diameter fork-shaped rings, such as rigidity matching of adjacent structures and optimal force transmission path, the present invention provides a stress diffusion structure of fork-shaped rings with non-equal-thickness walls to solve the problem of original weld design defects.

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