Kai Wu
,
Jin-Yu Zhang
,
Gang Liu
,
Jiao Li
,
Guo-Jun Zhang
,
Jun Sun
金属学报(英文版)
doi:10.1007/s40195-016-0375-4
An approach based on film buckling under simple uniaxial tensile testing was utilized in this paper to quantitatively estimate the interfacial energy of the nanostructured multilayer films (NMFs) adherent to flexible substrates. The interfacial energies of polyimide-supported NMFs are determined to be ~5.0 J/m2 for Cu/Cr, ~4.1 J/m2 for Cu/Ta, ~2.8 J/m2 for Cu/Mo, ~1.1 J/m2 for Cu/Nb, and ~1.2 J/m2 for Cu/Zr NMFs. Furthermore, a linear relationship between the adhesion energy and the interfacial shear strength is clearly demonstrated for the Cu-based NMFs, which is highly indicative of the applicability and reliability of the modified models.
关键词:
niaxial
,
tensile
,
testing
,
Nanostructured
,
multilayer
,
films
,
Flexible
,
substrates
,
Buckling
,
behaviors
,
Adhesion
,
energy
Gang LIU
,
Xuelian YIN
,
Shijian YUAN
材料科学技术（英文）
Buckling and forming processes of tubes with varying slenderness ratio (ratio of length to diameter) under external hydraulic pressure were analyzed with three-dimensional finite element method (FEM) for studying tube external pressure forming (EPF). Buckling pressures for different tube blanks without mandrel were predicted, and an EPF of a carbon steel tube onto a mandrel with six ribs was simulated. Both thickness distribution and buckling pressure from the simulations were found to be in agreement with those from experiments. Buckling pressures are shown to be a function of the slenderness ratio. The tubular part with six ribs produced by EPF has a uniform thickness distribution, whose maximum thinning rate is only 5.9%.
关键词:
External pressure forming
,
null
,
null
,
null
新型炭材料
doi:10.1016/S1872-5805(11)60091-7
采用分子动力学模拟研究了单壁碳纳米管的力学特性与其长度、直径及手性的关系.在施加拉伸或压缩载荷时,不同直径的单壁碳纳米管表现出明确的力学性能变化.锯齿型和扶手椅型碳纳米管的拉伸性能与其长度无关,而对于手性碳纳米管来说则稍有变化.所有类型碳纳米管的压缩特性,主要是刚度和临界压应力均随碳纳米管长度的变化而改变.断裂模式因结构不同而异,屈服过程产生纽结、波浪状结构、柱状屈曲、弯曲和扭曲等.
关键词:
单壁碳纳米管
,
手性
,
力学性能
,
断裂
,
屈曲
