報(bào)告會(huì)簡(jiǎn)介
報(bào)告人：Lin Ye教授
時(shí)間：2018年4月11日（星期三）9：30
地點(diǎn)：友誼校區(qū)國(guó)際交流中心國(guó)一會(huì)議室
題目：“Liquid Armour” – How Much Energy It Can Absorb?
沖擊動(dòng)力學(xué)講壇簡(jiǎn)介
沖擊動(dòng)力學(xué)講壇由西北工業(yè)大學(xué)沖擊動(dòng)力學(xué)及其工程應(yīng)用國(guó)際聯(lián)合研究中心建立的一個(gè)學(xué)術(shù)交流平臺(tái)。西北工業(yè)大學(xué)沖擊動(dòng)力學(xué)及其工程應(yīng)用國(guó)際聯(lián)合研究中心由西工大與荷蘭代爾夫特理工大學(xué)、法國(guó)巴黎第六大學(xué)、澳大利亞悉尼大學(xué)、美國(guó)阿克倫大學(xué)和澳大利亞斯威本科技大學(xué)等國(guó)際知名高校共同建立，2017年獲國(guó)家國(guó)際科技合作基地認(rèn)定。中心圍繞航空航天重大力學(xué)問(wèn)題以及“大飛機(jī)”和“兩機(jī)專(zhuān)項(xiàng)”等重大科技專(zhuān)項(xiàng)的工程需求，致力于先進(jìn)結(jié)構(gòu)與材料的動(dòng)態(tài)響應(yīng)、破壞機(jī)理等重大科學(xué)問(wèn)題及工程化應(yīng)用研究，與國(guó)際伙伴合作形成了一批具有國(guó)內(nèi)領(lǐng)先和國(guó)際先進(jìn)水平的聯(lián)合成果，解決了飛行器結(jié)構(gòu)及航空發(fā)動(dòng)機(jī)抗離散源撞擊等國(guó)際性難題，相關(guān)成果已在A(yíng)RJ21、C919、蛟龍AG600等國(guó)家重點(diǎn)型號(hào)飛機(jī)抗沖擊設(shè)計(jì)中得到應(yīng)用。
沖擊動(dòng)力學(xué)講壇面向全校師生，不定期邀請(qǐng)沖擊動(dòng)力學(xué)領(lǐng)域的國(guó)際著名學(xué)者，以邀請(qǐng)報(bào)告或?qū)W術(shù)沙龍的形式分享科研成果和進(jìn)展、研究經(jīng)驗(yàn)和心得，提升我校師生尤其是青年教師在沖擊動(dòng)力學(xué)、航空宇航等學(xué)科領(lǐng)域的基礎(chǔ)性和前沿性，同時(shí)促進(jìn)西北工業(yè)大學(xué)國(guó)際合作交流工作的發(fā)展。
內(nèi)容簡(jiǎn)介
Shear thickening fluids (STFs), are concentrated colloidal suspensions composed of non-aggregating solid particles suspended in fluids. These suspensions have the property of an abrupt increase in the fluid viscosity when the shear rate reaches its critical value.One promising application of STFs is to develop passive, energy-absorbing systems, in which STFs can divert or dissipate the energy via viscosity, friction or “plasticity” depending on deformation modes and rates. It was reported the Kevlar fabrics impregnated with a STF enhance ballistic penetration resistance, frequently referred to as“l(fā)iquid armor”,thus offering flexible body armour with significantly reduced thickness, though the conflicting results were also reported.
This work established some methods and approaches to investigate and characterizetheenergy-absorbing/dissipation properties of a STFsystematically after the shear-thickening transition. The STF selected for this work is composed of 58 vol.% dispersion of styrene/acrylate particles in ethylene glycol. The lap-shear and double-cantilever-beam specimens with the STF as adhesive layer were adopted to characterize shear strength, braking energy and mode-I fracture energy of the STF at different shear or crack opening displacement rates. The load-displacement curve as well as the high-speed video recording confirmed that the STF showed a “solid” behaviour at high rates by developing a brittle shear failure or stable crack extension that corresponds to a brittle fracture behaviour. The results indicated that the shear rate has a significant effect on the lap shear strength (with a plateau value of 0.3 MPa) and the total braking energy (with an average value of 4 kJ/m2) of the STF, while the displacement rate and the STF thickness have a significant effect on the mode-I fracture energy of the STF. The fracture energy increases as an increase in the displacement rate, while a plateau value of 240 J/m2was observed at high rates. Moreover, the studies were conducted to quantitatively characterize the energy absorption capacity of the STF under penetration impact and pull-out fracture at different impact or pull-out speeds. The results confirmed that the penetration rate again has a significant effect on energy absorbing capacity of the STF. In comparison with the energy absorbing behaviour of some cellular materials in literature, the STF outperforms a polyurethane foam in terms of penetration energy absorbing capacity.
報(bào)告人簡(jiǎn)介
Lin Ye教授為澳大利亞悉尼大學(xué)航空航天、機(jī)械和機(jī)電工程學(xué)院教授，悉尼大學(xué)先進(jìn)材料技術(shù)中心主任。他于1982年在哈爾濱工程大學(xué)獲得學(xué)士學(xué)位，1984年和1987年在北京航空航天大學(xué)分別獲得碩士和博士學(xué)位，1988年加入西安交通大學(xué)擔(dān)任講師，1990-1992年間，在德國(guó)TUKInstitute for Composite Materials (IVW GmbH)實(shí)驗(yàn)室擔(dān)任Alexander von Humboldt研究員。1992年7月加入悉尼大學(xué)，主要研究復(fù)合材料科學(xué)與技術(shù)、智能材料與結(jié)構(gòu)、納米材料和納米復(fù)合材料、結(jié)構(gòu)完整性和耐久性。Lin Ye教授于2005年當(dāng)選為澳大利亞技術(shù)和工程學(xué)院（Australian Academy of Technology and engineering, ATSE）院士。目前擔(dān)任Composites Communications副主編、CompositesScienceand Technology等一系列國(guó)際雜志編委。編著或參編13部書(shū),發(fā)表SCI論文249篇和102篇會(huì)議文章。
