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【学术论坛】航空学院青年学术论坛第144讲--西安交通大学陈小明教授
2019-04-26 17:04   航空学院 审核人:   (点击: )

时 间:2019年5月9日(星期四) 9:00-10:30

地 点:航空楼A706

报 告 人:西安交通大学陈小明教授

邀 请 人:张超教授

报 告 题目:Nanomechanical characterization of the mechanical strength of carbon nanotube - polymer interfaces

个人简介:

陈小明博士现任西安交通大学机械工程学院教授。陈小明博士于2014年获得美国纽约州立大学宾汉姆顿分校机械工程专业博士学位。并分别于2016和2017年入选西安交通大学“青年拔尖人才”支持计划和国家级青年人才培养计划。他主要从事微纳制造技术及微纳尺度界面效应等方面研究,主持或参加国家自然科学基金和国家重点研发计划等国家级项目4项;并参与美国美国空军科学研究项目,美国国家自然科学基金项目等国家级项目4项。在国际重要刊物上发表论文二十余篇,并参与撰写学术书籍2部,担任十余个国际高水平期刊评审专家。研究成果被包括Nature, Physical Review Letters等高水平期刊引用及被国际ScienceDaily, Phys.org等十多个知名科学信息平台报导。

摘要:

The light, strong and durable characteristics of nanofiber-reinforced polymer-matrix nanocomposites are attractive to a number of industries such as the aerospace and automotive industries. Carbon nanotubes (CNTs) are one of the most promising reinforcing fibers for nanocomposite due to their ultra-strong, resilient and low-density properties. However, the understanding of the interfacial load transfer on CNT-polymer interfaces remains elusive. In this talk, we present experimental studies of the mechanical strength of the interfaces formed by individual CNTs with PMMA/Epoxy matrices. The nanotube-polymer interfacial strength was characterized by using in situ electron microscopy nanomechanical single-tube pull-out techniques. By pulling out individual double-walled nanotubes from polymer matrices using atomic force microscopic force sensors inside a high-resolution scanning electron microscope, both the pull-out force and the embedded tube length were measured with resolutions of a few nano-newtons and nanometers, respectively. The interfacial shear strength (IFSS) of the CNT-polymer interface was quantified through interpreting the nanomechanical single-tube pull-out measurements using a continuum mechanics model. The nanomechanical measurements reveal the shear-lag effect in the load transfer on the CNT-polymer interface. The research findings help to better understand the load transfer on the tube-polymer interface and the reinforcing mechanism of the nanotubes, and ultimately contribute to the optimal design and performance of nanotube-reinforced polymer nanocomposites.

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