Advances in Research on Material Mechanical Properties of Modern Architectural Coated Fabrics
Due to the advantages such as lightweight,high strength,weather resistance and convenient processing and transportation,coated fabrics are widely applicated in various domains,including public buildings,emergency rescue,aerospace,industry,and the military.In recent years,to precisely analyze coated fabrics and drive their applications across multiple fields,the mechanical properties have become a central focus.An in-depth analysis of relevant literature spanning over two decades from both domestic and international sources was conducted utilizing CiteSpace.It employs visual knowledge mapping to elucidate the evolution of research hotspots in membrane structure and systematically examines research advancements in testing methods,mechanical properties and macro-micro constitutive models.A review reveals that the early stages were primarily centered around structural form-finding and static analysis.However,with the wide application of membrane structure in different fields in China,the research has been expanded to various fields such as material non-linear constitutive behavior,strength criteria and structural risk assessment.1)The tensile performance of coated fabrics is influenced by various factors,including microstructure,base fabric weaving process,coating technique and fiber type,resulting in distinct anisotropic characteristics.The tensile strength exhibits two distinct variations,resembling a"U"shape and a"W"shape,with increasing off-axis angles.2)Biaxial shear testing methods have been widely adopted to ensure a uniform distribution of shear stress in the core region of specimens and are currently prevalent in assessing shear performance of coated fabrics.3)The tear strength of coated fabrics is significantly influenced by the testing method,with current research predominantly focused on tear performance of coated fabrics.The impact mechanism of initial defects on the static and dynamic performance of membrane structures requires further clarification.4)Presently,research on membrane structure connections primarily emphasizes in-plane tensile performance of bonded connections between membrane panels,overlooking the potential of delamination failures under out-of-plane loads.5)Constitutive models for coated fabrics are categorized into micro-mechanical models and macroscopic phenomenological models.Existing macroscopic models have largely succeeded in describing the nonlinear,non-elastic and viscoelastic mechanical characteristics of coated fabrics,while micro-mechanical models tend to focus more on predicting tensile stiffness,with relatively limited research pertaining to predicting tensile strength.After years of effort,the research on coated fabrics has made substantial progress.However,several issues still require further investigation.1)The current classification of coated fabrics is monotonous and fails to consider differences in intended use and characteristics.2)Membrane structure damage primarily involves tearing,yet design specifications have not been adequately addressed.3)In-plane tensile testing is difficult to accurately reflect the real stress states,mechanical properties and failure modes in the heat-sealed regions of coated fabrics.The impact mechanisms of heat-sealing welding processes on the performance of joint of coated fabrics require further investigation.4)Currently,there is a paucity of research on the fatigue performance of coated fabrics and the connection points,and the fatigue damage mechanisms have yet to be clearly elucidated.
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