Flexible membrane material shearing performance testing method considering tensile-shear coupling effect
A test method and coupling effect technology, applied in the direction of using a stable shear force to test the strength of the material, can solve the problems of the significant influence of the shear mechanical properties of the membrane material and the error of the shear parameters, so as to improve the test accuracy and applicability properties, moderate specimen size, and accurate acquisition of material shear parameters
Inactive Publication Date: 2019-09-06
NANJING UNIV OF SCI & TECH
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Problems solved by technology
There is an error between the shear parameters obtained by the above test method and the shear parameters of the membrane material under actual working conditions. Membranes are often in a state of tension and shear stress coexistence, and the tensile stress state (stress ratio and tensile stress level) has a significant impact on the shear mechanical properties of membrane materials; on the other hand, there is a correlation between shear stress and shear strain, and shear stress There are differences in shear parameters at different stress levels
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[0037] The present invention will be further described below in conjunction with accompanying drawing.
[0038] The present invention is a method for testing the shear mechanical properties and mechanical parameters of membrane materials, which can be applied to the determination of shear mechanical properties and shear mechanical parameters of membrane materials such as thermoplastic polymer films, coated fabric films and laminated fabric films, Obtain accurate and reliable shear mechanical properties and shear mechanical parameters. Follow the steps below to implement it:
[0039] The first step is to determine the tensile and shear stress state range of the membrane material test. According to the actual engineering case - the stress state of the membrane surface of the nose cone of the airship membrane structure, the numerical method ( Figure 5 ), determine that the range of tensile stress ratio N used for the test is [2 / 3,3 / 2], the range of tensile stress σ is [1kN / m,7k...
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The invention discloses a flexible membrane materialshearing performance testing method considering a tensile-shear coupling effect. Based on a biaxial testing method, the deflection angle and warp and weft stress ratio parameters of the membrane material are integrated to realize the coupling stress state of the flexible membrane in the coexistence of tensile and shear stresses; different shear stress levels can be set based on specific working conditions of the membrane surface in membrane structural engineering,and the correlation between shear stress and shear strain is analyzed;and basedon treatment and analysis of material mechanics theory, the shear stiffness of the flexible membrane under the tensile-shear coupling stress is obtained. The flexible membrane material shearing performance testing method considering the tensile-shear coupling effect is superior to the existing shear testing method in terms of stress stability, tensile and shear stresses synchronization, test operability and the like, the test of the mechanical properties of the flexible membrane under the true tensile-shear coupling stress state can be realized,the correlation analysis between the shear stressand the shear strain is realized, and the shortcomings of the existing flexible membrane shear performance testing method areeffectively compensated.
Description
technical field [0001] The invention relates to the field of testing the shear performance of flexible membrane materials, in particular to a method for testing the bidirectional tensile and shear performance of flexible membrane materials considering the tension-shear coupling effect. Background technique [0002] Flexible film is an emerging structural material, mainly including thermoplastic film, coated fabric film and laminated fabric film, etc. It has the advantages of light transmission, light weight, high strength, durability, heat resistance, insulation, etc. It is widely used in the field of modern building structures and industrial fields such as aviation and aerospace, such as the main constituent materials of architectural membrane structures, aviation airships, superpressure balloons, aerospace parachutes or soft landing systems. However, the mechanical properties of flexible membranes are relatively complex, especially the shear properties, which have many unc...
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IPC IPC(8): G01N3/24
CPCG01N3/24
Inventor 陈建稳吴善祥赵兵周涵关晓宇周子龙
Owner NANJING UNIV OF SCI & TECH
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