The Analysis and Comparison of the Needle-puncture Property of Four Types of Silkworm Cocoons
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ISSN 1229-9197 (print version) ISSN 1875-0052 (electronic version)
The Analysis and Comparison of the Needle-puncture Property of Four Types of Silkworm Cocoons Qian Wang1, Yan Zhang1, Hao Chen2, Rong Zhang1, Xuhong Yang1, Ping Wang1*, and Pibo Ma3* 1
National Engineering Laboratory for Modern Silk, College of Textile and Clothing Engineering, Soochow University, Suzhou 215123, China 2 Shandong Institute for Product Quality Inspection, Jinan 250000, China 3 Key Laboratory of Eco-textiles, Ministry of Education, Jiangnan University, Wuxi 214122, China (Received November 4, 2019; Revised December 6, 2019; Accepted December 16, 2019) Abstract: Silkworm cocoons display outstanding properties in many aspects, such as thermal protection, biocompatibility and mechanical resistance and so on. In this paper, we focus on the puncture properties without detailed exploration of four types of cocoons (three domesticated cocoon and Eri silkworm). Different sections, end and middle, as well as different directions, puncturing from inner and outer surface, of four types of aforementioned cocoons were systematically analyzed and compared. The results of present research show that the middle section exhibits a relatively greater needle-puncture resistance compare with end section for three B. mori silkworm cocoons. With regard to different puncture directions, from external and internal surface, puncturing from internal surface exhibits a relatively higher needle-puncture load as well as fracture displacement tendencies compared with needle-puncture performance from external surface no matter in middle or end sections. Combining physical parameter assessment, statistical analysis and needle-puncture performance, this research inspires a clear-cut frame to design a composite with high puncture resistance. Keywords: Silkworm cocoon, Needle-puncture property, Different sections and directions
referring to pelade layer, the external layer and the outer floss with different properties. The innermost layer is named as the pelade layer which is smooth and dense enough while the outermost layer looks rough and has a certain curvature. The loose layer around the cocoon is considered as the outer floss [10]. In the past few years, some scholars have conducted a comprehensive study on silkworm cocoons which major in the field of thermal insulation [11,12], medical exploration [1,13] and mechanical properties [5-9,14]. With respect to the mechanical performance including peeling, tensile, hardness or elasticity properties of the silkworm cocoon, scholars have conducted a series of broad and systematical research. For instance, Guan et al. [5] suggested that the B. mori cocoon showed a brittle and weak structure while the A. pernyi cocoon appeared to be tough and strong according to the comparison results. Moreover, Chen et al. [7,8] conducted the stripping test of silk cocoons to understand the relationship between the structure and the mechanical properties of B. mori cocoons. Recent years, researchers have also adopt new way to explore the
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