Method for judging breaking strength of coating fabric membrane material

Abstract

The invention discloses a method for judging the breaking strength of a coating fabric membrane material and is suitable for judging the breaking strength of the coating fabric membrane material in a construction membrane structure. A tensile test is carried out on the coating fabric type membrane material by an off-axis tensile test method, so that the material can be subjected to the common action of tension and shearing force; when the test tension is gradually increased, the coating fabric type membrane material is broken, and the positive stresses and the shearing stresses of the coating fabric type membrane material in two main axis directions, namely the warp direction and the weft direction, meet an expression; whether the material gets to the breaking state can be judged by judging whether components of the stress meet the expression. According to the method, the breaking strength of the coating fabric type membrane material in a complex stress state can be accurately forecast; some main factors which influence the breaking strength of the coating fabric type membrane material are reasonably selected; therefore, the mutual action of the positive stresses in the warp direction and the weft direction can be reflected, and the coupling action of the tension and the shearing force can be also reflected, so that the problem of most existing strength models is effectively solved.

Description

technical field [0001] The invention relates to a judging method, in particular to a judging method for the breaking strength of a coated fabric membrane material suitable for building membrane structures. Background technique [0002] In engineering applications, materials are often under complex stress states, so it is necessary to judge the safety-damage limit state of materials and establish strength prediction criteria for material failure. Due to the complexity of material strength issues, it is impossible to include all factors affecting material failure in the strength criterion. We can only select factors with greater influence from the observation of a large number of test results to establish a mathematical relationship expressing the strength condition. The failure criterion is one of the main design basis of structural design, which is of great significance to the development and application of materials. [0003] In actual situations, materials are always in a...

AI Technical Summary

Problems solved by technology

The results show that: when the off-axis angle is 30 degrees, 45 degrees and 60 degrees, the prediction results of the existing method are in good agreement with the experimental results; and when the off-axis angle is 15 degrees and 75 degrees, the prediction results of the existing method The results are quite different from the experimental results

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