“有限初始变形”屈曲实验和理论研究（英文）

IMECH-IR > 非线性力学国家重点实验室

	“有限初始变形”屈曲实验和理论研究（英文）
	苏业旺 ; 赵宏宇 ; 黄永安
会议录名称	2018年全国固体力学学术会议摘要集（下）
	2018-11-23
页码	204-204
会议名称	2018年全国固体力学学术会议
会议日期	2018年11月23日至25日
会议地点	中国黑龙江哈尔滨
摘要	The initial deformation of structures before the onset of buckling is usually very small in conventional concepts, and is always neglected in the conventional buckling theory(CBT) and numerical method(CNM). In this work, we find a class of structures from the emerging field of stretchable electronics, of which the initial deformation becomes large and essential for determining the critical buckling load. The buckling of these structures is referred to as the ‘finite-initial-deformation buckling'(FID buckling). Although great progress has been made for the buckling theory in the past hundred years, it is still challenging to analyze the FID buckling behaviors. Here, experimental stretch of a series of serpentine interconnects was firstly conducted as a representative example to show the FID buckling behaviors and the inapplicability of the CBT and CNM. The CNM can yield a huge error of 50% on the critical buckling load for the case with thickness-to-width ratio of the cross section h/b=0.6. Most importantly, a systematic theory(FID buckling theory) is developed to analyze the FID buckling behaviors of beams, with the coupling of bending, twist and stretch/compression. As a comparison, various theoretical and numerical methods are applied to three classic problems, including lateral buckling of a three-point-bending beam, lateral buckling of a pure bending beam and Euler buckling. Our FID buckling theory is able to give a good prediction, while the CBT(by Timoshenko et al.) and CNM(by commercial program packages) yield unacceptable results(with 70% error for a three-point-bending beam with h/b=0.8, for example).
关键词	buckling three-point bending critical buckling load finite deformation mechanics stretchable electronics
资助信息	国家自然科学基金项目(11572323)
语种	英语
文献类型	会议论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/80474
专题	非线性力学国家重点实验室
作者单位	1.中国科学院力学研究所非线性力学国家重点实验室 2.华中科技大学数字制造装备与技术国家重点实验室
推荐引用方式 GB/T 7714	苏业旺,赵宏宇,黄永安. “有限初始变形”屈曲实验和理论研究（英文）[C]2018年全国固体力学学术会议摘要集（下）,2018:204-204.

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