Powder tensile strength

SIMBO G., ASAKAWA S., SOGA N. "Measurement of adhesion force of powder particles by powdered tensile strength method" J. Soc. Mater. Sc. Japan 1968 n 17 540-544. 

Before Ashton et al. (1964) developed the split cell apparatus for the measurement of the powder tensile strength the method used was a tilting plate. This method, however, made no provision for the consolidation of a powder at different bulk densities and the angle of inclination could only be measured, at best, with an accuracy of 5%. 

The smaller the consolidation radius stress ovr < the larger ovm > [Pg.78]

FIG. 20-70 The influence of moisture as a percentage of sample saturation S on granule deformabihty. Here, deformation strain (AL/L) is measured as a function of applied stress, with the peak stress and strain denoted by tensile strength and critical strain (AL/L) of the material. Dicalcium phosphate with a 15 wt % binding solution of PVP/PVA Kolhdon VAG4. [Holm et al., Powder Tech., 43, 213 (1.9S.5J,] With land permission from Elsevier Science SA, Lausanne, Switzerland. 

Titanium is a white metal and, when cold, is brittle and may be powdered. At a red heat it may be forged and drawn. The tensile strength of titanium is almost the same as that of steel, while its specific gravity (4.5) is almost two times less than that of steel. Hence, its specific strength (tensile strength/speciflc gravity) is 1000, which is considerably higher than that of 18/8 steel, which has a value of 700. Titanium is now available as plate, sheet and tube, and its use in chemical plant construction is considered common. 

Reduced Wear Electrical Conductivity Glass fibers Carbon fibers Lubricating additives Carbon fibers Carbon powders Ductility, cost Tensile strength, ductility, cost Ductility, cost Tensile strength, ductility, cost... 

Tensile Strength of Cast Double-Base Powder as a Function of Nitrocellulose Content P 423 Elongation of Cast Double-Base Powder as a Function of Nitrocellulose. Content. .. P 423 Modulus of Elasticity of Cast Double-Base Powder as a Function of 1 1 ... 

Fig 2 Tensile strength of cast double-base powder as function of nitrocellulose content... 

FIGURE 38.4 Tensile strength of polypropylene-maleic anhydride grafted polypropylene (PP-MA-g-PP)-ruhher powder composite as a function of ruhher powder content. (Reprinted from Shanmugharaj, A.M., Kim, J.K., and Ryu, S.H., Polymer Test., 24, 739, 2005. With permission.)... 

Attempts have been made to improve the mechanical properties of these cements by adding reinforcing fillers (Lawrence Smith, 1973 Brown Combe, 1973 Barton et al, 1975). Lawrence Smith (1973) examined alumina, stainless steel fibre, zinc silicate and zinc phosphate. The most effective filler was found to be alumina powder. When added to zinc oxide powder in a 3 2 ratio, compressive strength was increased by 80 % and tensile strength by 100 % (cements were mixed at a powder/liquid ratio of 2 1). Because of the dilution of the zinc oxide, setting time (at 37 °C) was increased by about 100%. As far as is known, this invention has not been exploited commercially. 

A method of measuring tensile strength has been developed by Ashton et a/.(13) who also used a cylindrical cell split diametrically. One half of the cell is fixed and the other, which is movable, is connected to a spring, the other end of which is driven at a slow constant speed. A slowly increasing force is thus exerted on the powder compact and the point at which failure occurs determines the tensile strength this has been shown to depend on the degree of compaction of the powder. 

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