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首页> 美国卫生研究院文献>Journal of the Royal Society Interface >Intrinsic tensile properties of cocoon silk fibres can be estimated by removing flaws through repeated tensile tests
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Intrinsic tensile properties of cocoon silk fibres can be estimated by removing flaws through repeated tensile tests

机译：茧丝纤维的固有拉伸性能可通过反复拉伸试验消除缺陷来估算

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摘要

Silk fibres from silkworm cocoons have lower strength than spider silk and have received less attention as a source of high-performance fibres. In this work, we have used an innovative procedure to eliminate the flaws gradually of a single fibre specimen by retesting the unbroken portion of the fibre, after each fracture test. This was done multiple times so that the final test may provide the intrinsic fibre strength. During each retest, the fibre specimen began to yield once the failure load of the preceding test was exceeded. For each fibre specimen, a composite curve was constructed from multiple tests. The composite curves and analysis show that strengths of mass-produced Muga and Eri cocoon silk fibres increased from 446 to 618 MPa and from 337 to 452 MPa, respectively. Similarly, their toughness increased from 84 to 136 MJ m−3 and from 61 to 104 MJ m−3, respectively. Composite plots produced significantly less inter-specimen variations compared to values from single tests. The fibres with reduced flaws as a result of retests in the tested section have a tensile strength and toughness comparable to naturally spun dragline spider silk with a reported strength of 574 MPa and toughness of 91–158 MJ m−3, which is used as a benchmark for developing high-performance fibres. This retesting approach is likely to provide useful insights into discrete flaw distributions and intrinsic mechanical properties of other fatigue-resistant materials.
机译：蚕茧的蚕丝纤维强度比蜘蛛蚕丝低，并且作为高性能纤维的来源受到较少的关注。在这项工作中，我们采用了创新的方法，通过在每次断裂测试后重新测试纤维的未断裂部分，逐渐消除单个纤维样品的缺陷。进行了多次，以便最终测试可以提供固有的纤维强度。在每次重新测试期间，一旦超过了先前测试的失败载荷，纤维样本就开始屈服。对于每个纤维样品，通过多次测试构建了一条复合曲线。合成曲线和分析表明，批量生产的Muga和Eri茧丝纤维的强度分别从446 MPa增加到618 MPa和从337 MPa增加到452 MPa。同样，它们的韧性分别从84 MJ m -3 增加到136 MJ m -3 。与单次测试的值相比，复合图产生的标本间差异明显更少。在测试部分进行重新测试后，缺陷减少的纤维的拉伸强度和韧性与天然纺制的拉丝线蜘蛛丝相当，据报道其强度为574 MPa，韧性为91–158 MJ m −3 ，用作开发高性能纤维的基准。这种重新测试方法可能会为其他耐疲劳材料的离散缺陷分布和固有机械性能提供有用的见识。

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