材料期刊网

碳纳米管纱作为填料应用于硝基芳烃污水处理

Sushil R. Kanel , Heath Misak , Dhriti Nepal , Shankar Mall , Seth W. Brittle , Ioana Sizemore , David M. Kempisty , Mark N. Goltz

新型炭材料 doi:10.1016/S1872-5805(16)60021-5

碳纳米管纱( CNTY)因具有优异的力学强度、化学稳定性、热稳定性和高比表面积而成为去除废水中有机污染物的潜在材料。本文将CNTY用于含2,4-二硝基甲苯(DNT)的污水处理。 CNTY对DNT的吸附能力与文献报道值作对比研究,同时探讨吸附动力学。采用SEM-EDX、HRTEM、Raman与XPS表...

关键词: 碳纳米管纱 , 2,4-二硝基甲苯 , 吸附 , Freundlich吸附等温线 , 新兴技术

Mechanical Model on Brittle Crack Initiation and Propagation

Guangwei HAN , Di FENG , Wujun YE and Heli LUO (Dept. of Superalloy , Central Iron and Steel Research Institute , Beijing 100081 , China)

材料科学技术（英文）

A mechanical model is presented in this paper to describe the initiating and propagating of brittle cracks. Two criteria have been deduced from the model to determine the effects of such factors as local stress state, surface and grain boundary energies as well as loca...

关键词:

Fracture mechanism of some brittle metallic glasses

Journal of Applied Physics

A systematic study on the fracture surface of brittle Mg-, Fe-, and Co-based metallic glasses under compressive loading is approached and a fracture mechanism is proposed. Experimentally, the metallic glass samples are compressed into many small fragments, displaying a...

关键词: brittle fracture;brittleness;cobalt alloys;cracks;elastic waves;iron alloys;magnesium alloys;metallic glasses;bulk amorphous-alloys;energy-dissipation;crack-propagation;dynamic;fracture;instability;strength

PROBABILISTIC MODELING OF BRITTLE FRACTURE WITH PRIOR DUCTILE CRACK EXTENSION

H. Y. Jing , L. X. Huo , Y. F. Zhang and F. Minami( 1) College of Material Science , Tianjin University , Tianjin 300072 , China 2) Osaka University , Japan)

金属学报(英文版)

A computation framework for brittle fracture which incorporates weakest link statistics and a microme- chanics model reflecting reflecting local damage of the material is described.The Weibull stress W emerges as a probabilistic fractur...

关键词: fracture toughness , null , null

Nanoscale Morphology in Tensile Fracture of a Brittle Amorphous Ribbon

Xifeng LI , Kaifeng ZHANG , Guofeng WANG

材料科学技术（英文）

The paper reports on the observation of nanoscale morphology on the tensile fracture surface of a brittle amorphous Fe-based ribbon. The formation of nanoscale damage cavity structure is a main characteristic morphology on the fracture surfaces. Approaching the ribbon ...

关键词: Nanoscale periodic corrugation , 断裂空洞 , 拉伸断裂

CRACK TIP STRUCTURE AND DUCTILE-BRITTLE TRANSITION IN BULK SINGLE CRYSTALS

HA Kuan fu , WANG Xiuhua (Jilin University , Changchun. 130023. China Manuscript received 26 December. 1994)

金属学报(英文版)

Based on the crack tip structure a new model of ductile -brittle transition was proposed. Using this new model we calculated the dependence of the transition temperature-strain rate over a wide range of strain rate. Finally the significance of this new model is discuss...

关键词: : fracture mechanics , null , null , null

The dependence of the fractal dimension of crack on material for brittle fracture in two dimensions

Physics Letters A

Two-dimension spring square network model involving the nearest and second neighbour bonds is studied by numerical simulation with Gauss-Seidel iteration for brittle fracture Mode 1. The material-dependent parameter, G(0)/G, is introduced in this simulation, G and G(0)...

关键词: fracture;crack;fractal dimension;scanning-tunneling-microscopy;surfaces;roughness;geometry;metals;model

The effect of quenched disorder on the fractal dimension of crack for brittle fracture in two dimensions

Physica a-Statistical Mechanics and Its Applications

Two-dimensional spring square network model involving the nearest and second neighbour bonds is studied by numerical simulation with Gauss-Seidel iteration for brittle fracture Mode I. The material-dependent parameter, G(0)/G(1) is introduced in this simulation, and G ...

关键词: disorder;fracture;crack;fractal dimension;scanning-tunneling-microscopy;surfaces;breakdown;lattices;metals

Brittle fracture behavior of FeMoSiB nanocrystalline alloy ribbon and measurement of fracture toughness

Materials Letters

By employing a pulsed laser source to produce microcracks, typical features of brittle fracture of nanocrystalline FeMoSiB ribbon have been investigated. From the energy viewpoint, explanation for the branching behavior of a moving crack front was proposed. Static and ...

关键词: nanocrystalline;SEM;brittle fracture;branching;fracture toughness;mechanical-properties;wire

Fracture instability in brittle Mg-based bulk metallic glasses

Journal of Alloys and Compounds

A densely packed striation structure is observed in the apparently featureless mirror area of the fracture surface of brittle Mg-based bulk metallic glass. Taylor instability analysis based on grease model combined with a competitive microvoid formation mechanism ahead...

关键词: metallic glass;fracture;toughness;fractograph;amorphous-alloys;mechanical-properties;deformation;plasticity