A Prediction Method for Viscoelastic Constitutive Behavior of Coated Fabric Membranes

Abstract

The invention discloses a method for predicting a viscoelasticity constitutive behavior of a coated fabric membrane material. The method is suitable for predicting the viscoelasticity constitutive behavior of the coated fabric membrane material in a building membrane structure. The method comprises the following steps: carrying out a tension test on the coated fabric membrane material by virtue of a single-shaft cyclic tension test method, stretching the membrane material to the maximum stress in a certain constant speed, unloading the stretching degree to 0 in the same speed, circulating until reaching a stable state so as to obtain a stress-strain curve of the membrane material under the single-shaft cyclic tension effect, wherein the stress and strain of the coated fabric membrane material along the tension direction meet an expression; and carrying out stress-strain relation prediction by virtue of the expression, so as to directly reflect the viscoelasticity constitutive behavior of the coated fabric membrane material. According to the method, important parameters influencing the viscoelasticity property of the coated fabric membrane material are reasonably selected, the true mechanical properties of the membrane material are accurately reflected, the problems of most viscoelasticity constitutive relation models are effectively remedied, and the reference is provided for the analysis and calculation of the building membrane structure.

Description

technical field [0001] The invention relates to a prediction method, in particular to a prediction method for the viscoelastic constitutive behavior of coated fabric membrane materials. Background technique [0002] The application of membrane structure in my country has a history of more than ten years. During this period, my country has made great progress in the calculation and design theory, production and engineering practice of membrane structure, and compiled and published design and testing technical regulations. At present, China already has the ability to carry out various tasks such as calculation, design, production, installation, testing and monitoring for large-scale projects by itself. However, relatively speaking, the basic research work on the constitutive relationship and basic material properties of membrane structural materials is very weak. As a part of the structure, the membrane surface is mostly exposed to the air, and it is inevitably subjected to w...

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Problems solved by technology

The results show that: due to the complex internal structure of the coated fabric membrane material, which has obvious nonlinear, inelastic, anisotropic and viscoelastic properties, the existing model cannot make a prediction for the viscoelastic behavior of the coated fabric membrane material. Good prediction, the difference between the predicted results and the experimental results is relatively large

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