Adjustable torsional load coordinated loading system

Abstract

The invention discloses an adjustable torsional load coordinated loading system, which relates to the field of torsional strength testing. The system comprises a hollow test frame, a plurality of pulleys, a steel cable, a test model, two tension sensors and a hydraulic loading oil cylinder, wherein the test model is arranged at the hollow part in the test frame; the plurality of pulleys and the hydraulic loading oil cylinder are arranged on the inner wall of the test frame and are positioned on a loading section of the test model; the steel cable is tightened to generate tension through the loading of the hydraulic loading oil cylinder; tensile forces with opposite directions and the same size are generated at two antisymmetric force applying positions of the test model at the same time sothat the test model is in pure torsional deformation; the torsion load is obtained through measurement of the tension sensors, synchronous coordinated loading of the torsion load is achieved, the free rotation of a rotating assembly connected with the steel cable enables the tension direction to freely change along with the increase of the load, and the detachable connection among all the components meets the loading requirements of test models of different scales.

Description

Technical field [0001] The invention relates to the field of torsion strength testing, in particular to an adjustable torsion load coordinated loading system. Background technique [0002] Torsional strength is an important indicator for evaluating the safety performance of hull structures, reflecting the ability of hull structures to withstand torsional loads, especially for vessels with large openings such as container ships and bulk carriers, the torsion resistance of their structures is more important. The large-scale steel reduction model test is an effective method for the research of ship structure performance, which can reflect the stress response of the actual structure under load, the stress distribution state of the high-stress area, and the law of load transfer. Therefore, it is necessary to carry out steel reduction Experimental study on torsional strength of the model. In the torsional strength test of the steel scale model, a fixed arm is generally used to realize...

AI Technical Summary

Problems solved by technology

In the torsional strength test of the steel scale model, the fixed arm is generally used, and the torsional load is realized by loading the oil cylinder. The disadvantages of this method are: 1) The direction of loading is limited, and follow-up loading cannot be realized

When the model is torsion and produces large deformation, the load direction of the model changes, but the loading direction of the oil cylinder remains unchanged, which limits the loading capacity of the torsional load, and may cause deformation and damage to the oil cylinder in severe cases

2) When a single force arm is used for loading, the combined bending and torsion deformation of the model will occur, which brings difficulties to the analysis of torsional strength

3) When anti-symmetric loading with double moment arms is used, due to the influence of elastic deformation of the structure, it is difficult to apply the loads of the two moment arms synchronously and harmoniously, resulting in a decrease in the accuracy of the test results

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