Notice of RetractionAnalysis of Shear Behavior for Medium and Heavy Plate
With the continuous development of large-scale software, the theory of finite element, and computer speed, so the accuracy has been continuously improved for numerical analysis of finite element. The numerical analysis method of finite element has become increasingly widely used in dealing with practical engineering problems, the calculated model was established by elastic-plastic theory under taking into account the factors including materials work-hardening, the velocity of cutting edge and so on. The law of stress and deformation has done a detailed analysis of deformation zone during shearing continuous casting slab based on the model. It can gain the largest shear force by the travel curve of shear stress, and seek the numerical simulation method for tilting shear force and energy parameters of the shearing machine, reach the purpose of less experiment and reducing the cost analysis. The results provide an effective way to determine the maximum shear stress and enhancement the useful rate of the cutting edge.
Analysis of the surface roughness of tangential turn-milling for machining with end milling cutter
Abstract This paper presents a performance assessment of rotary end milling at the tangential contact. With this shape of the contact, process has been more stable. At the last decade due to the fact that cutting tools have a quenching problem, Turn-milling has been developing in manufacturing technology for processing hard steels, where in both the workpiece and the tool are given a rotary movement simultaneously. Thus, cutting edges have a time for quenching. The objective of present work is to investigate process of tangential turn-milling for machining of workpieces with in the normally available range of speed and feeds to explore its advantages. The investigations have been laid mainly on surface roughness and timing process. The experiments have been conducted for tangential turn-milling of mild steel workpiece.
Mechanical behaviour and durability of high volume fly ash cementitious composites
The purpose of this research is to separate different morphological particles of ASTM class F fly ash, and study their effect on mechanical behaviour and durability of high volume cementitious mixtures. In this research wet separation of raw fly ash is carried out, which resulted in three layers of different morphological particles. The first layer of particles float, comprise of about 1-5% of fly ash, is identified as cenospheres or hollow spheres. The second layer of particles is measured to be 55-60% of raw fly ash and consisting of porous spherical and rounded particles rich in Si and Al. The third layer particles is measured to be about 35-40% of raw fly ash. High volume fly ash cementitious composites containing second or third layer particles are tested under compression and bending, highlighting a higher strength and ductility in comparison to cementitious ones containing raw fly ash particles. KEYWORDS. Cementitious matrix; Raw fly ash; Second layer particles; Third layer particles.