Impact-induced acceleration by obstacles

被引:5
|
作者
Corbin, N. A. [1 ]
Hanna, J. A. [1 ,2 ,3 ]
Royston, W. R. [1 ]
Singh, H. [1 ]
Warner, R. B. [1 ]
机构
[1] Virginia Polytech Inst & State Univ, Dept Biomed Engn & Mech, Blacksburg, VA 24061 USA
[2] Virginia Polytech Inst & State Univ, Dept Phys, Blacksburg, VA 24061 USA
[3] Virginia Polytech Inst & State Univ, Ctr Soft Matter & Biol Phys, Blacksburg, VA 24061 USA
来源
NEW JOURNAL OF PHYSICS | 2018年 / 20卷
基金
美国国家科学基金会;
关键词
chains; impact; coiling; DYNAMICS; CHAIN;
D O I
10.1088/1367-2630/aac151
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We explore a surprising phenomenon in which an obstruction accelerates, rather than decelerates, a moving flexible object. It has been claimed that the right kind of discrete chain falling onto a table falls faster than a free-falling body. We confirm and quantify this effect, reveal its complicated dependence on angle of incidence, and identify multiple operative mechanisms. Prior theories for direct impact onto flat surfaces, which involve a single constitutive parameter, match our data well if we account for a characteristic delay length that must impinge before the onset of excess acceleration. Our measurements provide a robust determination of this parameter. This supports the possibility of modeling such discrete structures as continuous bodies with a complicated constitutive law of impact that includes angle of incidence as an input.
引用
收藏
页数:8
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