Tensile strength, removable

The design of load-bearing structures for service at room temperature is generally based on the yield strength or for some appHcations on the tensile strength. The metal is expected to behave essentially in an elastic manner, that is, the stmcture undergoes an elastic deformation immediately upon load apphcation and no further deformation occurs with time. When the load is removed, the stmcture returns to its original dimensions. 

Spall is the process of internal failure or rupture of condensed media through a mechanism of cavitation due to stresses in excess of the tensile strength of the material. Usually, a dynamic failure is implied where transient states of tensile stress within the body are brought about by the interaction of stress waves. Free surfaces are assumed to be well removed from the material point of interest and play no role in the spall process. 

Dispersion polymer, which leads to products with improved tensile strength and flex life, is not easily fabricated by the above techniques. It has, however, been found possible to produce preforms by mixing with 15-25% of a lubricant, extruding and then removing the lubricant and sintering. Because of the need to remove the lubricant it is possible to produce only thin-section extrudates by this method. 

Controlling the extraction rate is vital because the shape and texture of the resultant fiber is directly influenced by the solvent removal rate. As the solvent is extracted from the surface of the fiber, significant concentration gradients can form. These gradients may result in a warping of the desired eircular shape of the fiber. For example, if the solvent is removed too quickly, the fiber tends to collapse into a dog-bone shape. Additionally, the solvent extraction rate influences the development of internal voids or flaws in the fiber. These flaws limit the tensile strength of the fibers. 

Changes in electrical resistivity (V3) and mechanical properties (V3, V4) of graphite fibers upon nitration have been studied. Increases in elastic modulus, and decreases in tensile strengths, have been related to removal of boundary dislocations by the intercalation process proposed elsewhere iN4). 

Tensile and Elongation. Samples of the belt wedge mbber, located between belts 1 and 2, were removed from both shoulders (serial side and opposite serial side) and buffed to a uniform thickness of 0.5-1.0 mm. Care was taken so that no signihcant heat was introduced to the samples by the buffing. Specimens were die-cut using an ASTM D 638 Type V dumbbell die and tested per ASTM D 412. Results obtained included modulus values at 100%, ultimate elongation, and tensile strength. Samples were tested at 20"/min (50.8 cm/min). 

Pure iron is silvery colored, relatively soft and not very useful. Cast iron containing some amount of carbon is brittle, but is very useful in the manufacture of pipes, machine and car parts, and pots and pans. If some of the carbon is removed and some trace metals are added, such as Mn, Cr, Ni, W, Mo and V, the mixture, known as steel, becomes stronger. Steels have high tensile strength and excellent resistance to corrosion. 

Attempts to totally remove all particulate matter (i. e. ultrafiltration) have not been completely successful in that the theoretical limit for water s tensile strength ( 1500 atm) has not been achieved. One of the largest experimental threshold values 200 atm) is that found by Greenspan [11]. 

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