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Spider silk has attracted the attention of many scientists because of its desirable physical properties. Most of this attention has been devoted to dragline silk, it thread that has high tensile strength, high strain and Ultra-low weight. To help understand structure-property relationships in spider silks, the tensile behavior of egg site (cylindrical gland) silk of Araneus diadematus Clerck 1757 was compared with dragline (major ampullate gland) and silkworm silks. In addition, stress-strain curves of egg sac silk were simulated by it spring-dashpot model, specifically a Standard Linear Solid (SLS) model. The SLS model consists of a spring in series with it dashpot and in parallel with another spring, resulting ill three unknown parameters. The average stress-strain curve of fibers from five different egg sacs could be accurately described by the model. Closer examination Of the individual stress-strain Curves revealed that in each egg Sac two populations of fibers could be distinguished based oil the parameters of the SLS model. The stress-strain curves of the two Populations clearly differed in their behavior beyond the yield point and were probably derived from two different layers within the egg sac. This indicates that silks in the two layers of A. diadematus egg sacs probably have different tensile behavior

MODELING OF THE STRESS-STRAIN BEHAVIOR OF EGG SAC SILK OF THE SPIDER ARANEUS DIADEMATUS