Anharmonicity and elastic hysteresis of fused SiO2 fibers
Anharmonicity and elastic hysteresis of fused SiO2 fibers
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熔融SiO2纤维的非谐性和弹性滞后
DOI：
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发表时间：
1978
期刊：
影响因子：
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通讯作者：
H. Kobayashi
中科院分区：
文献类型：
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作者：
H. Kobayashi
为了获得载荷-伸长曲线，用Hiki和作者专门研制的拉伸试验机对尼科尔斯法生产的直径为几μm的二氧化硅纤维进行了测试。测得的载荷-伸长率曲线呈非线性，表明杨氏模数随应变的增大而增大。此外，还观察到了明显的弹性滞回现象，增加的曲线与下降的曲线具有不同的轨迹，并平稳地返回原点。载荷-伸长曲线的非线性被解释为原子间非简谐相互作用的宏观表现。另一方面，在金属晶须中没有观察到的弹性滞后被认为是由熔融的SiO_2纤维随机网络的复杂变形引起的。
For the purpose of obtaining load‐elongation curves, fused SiO2 fibers a few μm in diameter, which were produced by Nichols’s method, were tested using the tensile‐testing machine which was specially prepared by Hiki and the author. Load‐elongation curves obtained showed nonlinearity which indicates that Young’s modulus becomes larger with increasing strain. Moreover, a distinct elastic hysteresis was observed in which increasing curves have different traces from decreasing ones and return to the origin smoothly. The nonlinearity of load‐elongation curves is explained as the macroscopic appearance of anharmonic interaction between atoms. On the other hand, an elastic hysteresis which has not been observed in metal whiskers is assumed to be caused by complex deformation of a random network of fused SiO2 fibers.