کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5187745 | 1381136 | 2005 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Mechanical properties of silkworm cocoons
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Mechanical properties of silkworm cocoons Mechanical properties of silkworm cocoons](/preview/png/5187745.png)
چکیده انگلیسی
Silkworm caterpillars, Bombyx mori, construct cocoons in order to protect their moth pupas against possible attacks from the outside. We experimentally measured the mechanical properties (Young's modulus, tensile strength, and thermo-mechanical parameters) of normal compact cocoons and the variations of these properties in the thickness direction of a cocoon. Tension tests were carried out by using rectangular specimens of two types, either cut from a normal compact cocoon or peeled from its different layers, respectively. We found that, on one hand, the overall or thickness-averaged mechanical properties of B. mori cocoons are excellent. More interestingly, on the other hand, the elastic modulus, strength and thermo-mechanical parameters all vary along the thickness direction of a cocoon in an apt manner, further enhancing its ability to resist possible attacks from the outside. In addition, the properties of a cocoon show distinct differences in the longitudinal and transverse directions. The relation between the mechanical properties and microstructures is discussed. Finally, the main features of the fracture process of cocoons and silks were also analyzed based on SEM observations. This study was attempted to gain an understanding of the mechanical behaviors and their dependence on the microstructures of cocoons, and it might be also helpful in guiding the design of novel safe-guarding devices and biomimetic materials.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 46, Issue 21, 7 October 2005, Pages 9192-9201
Journal: Polymer - Volume 46, Issue 21, 7 October 2005, Pages 9192-9201
نویسندگان
Hong-Ping Zhao, Xi-Qiao Feng, Shou-Wen Yu, Wei-Zheng Cui, Feng-Zhu Zou,