Nonlinear study and finite element analysis of shear modulus of PVC coated fabrics
In this paper,based on the phenomenon that the displacement of the top of the air-supported membrane structure is nonlinear when subjected to different horizontal loads,the shear performance of the membrane material was studied from the shear characteristics of the coated fabrics through biaxial tensile shear test,and the relationship between the shear stress and the shear modulus of the coated fabrics is obtained,it was found that the shear modulus of the membrane material is not a constant.In order to verify this conclusion,ABAQUS finite element analysis was introduced in this paper,and a material model was estab-lished according to the relationship between shear modulus and shear stress of the coated fabrics obtained in the test.The air-supported membrane structure is used as an sample for analysis.On the basis of considering the shear characteristics of the mem-brane material,the horizontal load displacement curve at the top of the air supported membrane structure obtained through simula-tion also shows a non-linear trend.The error rate between the simulated displacement with a constant shear modulus and the ex-perimental data is about 20%,while the error rate of the simulated displacement with a constant shear modulus of the membrane material changing with shear stress remains around 10%.The hypothesis that the shear modulus of the membrane is not constant is verified,indicating that the influence of the change of the shear modulus on the displacement and deformation of the gas-sup-ported membrane structure cannot be ignored.
coated fabricshear stressshear modulusnonlinearityfinite element analysis