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Foster Requested By Steven R. Therefore, presented herein are the mechanical and metallurgical test data for. Tensile strength averaged , psi MPa vs. Shear strength averaged , psi MPa vs. Fatigue life successfully achieved , cycles discontinue vs. For the un-coated? The part configuration selected was EN SPS Technologies had recently developed a high-strength titanium fastener alloy, and had issued technical reports documenting the successful development of large-diameter, ksi MPa , tension-rated fasteners SPS technical report and small-to-medium diameter, ksi MPa , tension-rated fasteners SPS technical report The intent of the present study was to establish whether this new titanium alloy could be used to manufacture a protruding head, point-drive fastener commonly made from ksi MPa alloy steel.
Titanium alloy aerospace fasteners have been manufactured for over 50 years. It is generally recognized, however, that fasteners from this alloy have size and strength limitations. For the last half-century, aerospace fastener users have basically had to live with these strength limitations. For years, fastener manufacturers have dreamed of developing stronger titanium -alloy fasteners whose performance could match alloy steel or CRES alloy fasteners. Unfortunately, this never happened. A few other special-purpose, titanium-alloy fasteners were commercialized, and these provided some strength improvement over fasteners made from Ti-6Al-4V.
By and large, however, these fasteners tended to have significant manufacturing liabilities. In addition, while shear strength might be improved in these fasteners, the tensile and fatigue strengths generally were not.
Therefore, direct substitution for heavier alloy fasteners remained an unfulfilled goal. That is, smooth-section properties may look attractive, but threaded properties are significantly reduced. SPS Technologies sought to develop a titanium alloy that could be used to manufacture bolts over a wide range of sizes that would be capable of maintaining the tensile, shear and fatigue strength requirements of alloy steel and CRES alloy fasteners.
The mill certificate for the raw material lot used in manufacturing the? Inspection found that the dimensions conformed to the requirements of AS The requirement is specified in EN, Table 2. Per the EN requirement, one sample was excised from a finished bolt and checked for hydrogen content with a hydrogen determinator.
The sample measured parts per million satisfying the parts per million maximum requirement. The microstructures we re typical for beta titanium. The core microstructure consisted of medium-sized beta grains; no primary alpha was present. Cold work is apparent in the head-to-shank fillet region from the fillet rolling operation.
Continuous flow lines in the thread roots indicate threads were rolled after heat treatment. Representative photomicrographs of head-to-shank fillets, thread roots, and bodies are presented in Figures 1 through 3. This is the parameter used for these titanium bolts.
Bearing surface is at the upper right; shank is at lower left. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies including amendments.
Normalized and tempered. Steel bars, forgings, and rings Steel bars and forgings Steel bars and forgings Plating, cadmium electrodeposited.
Dimensions and tolerances for oversizes shall conform with Table 5. Limitation of application: large diameter to titanium fasteners are not recommended for single shear applications, use ABS instead; diameter titanium fasteners are not recommended for single shear applications at all. Total mass of the head and threaded part : 1st mass column of Table 3. Mass of the smooth part : Multiply the value of the 2nd mass column of Table 3 value according to the diameter code No.
Thread of steel bolts shall be carried out after heat treatment. G max. Thread functionality 1,0 pitch K I? D see note 2 See note 1 Note 1: The diameter measured at point I shall be less than or equal to the max. Note 2: Check concentricity of diameters D shank and TD thread to avoid interference between the bolt thread and hole when using tight interference fits.
Note 3: The maximum thread runout for oversizes is incremented by 0,25 mm. Dimensions in mm. Figure 1 : Configuration, dimensions and tolerances J? A B Ref. D T code 4, 4, 4, 4, 5, 5, 6, 6, 7, 7, 9, 9, 11, 11, 12, 12, 14, 14, 15, 15, 19, 19, 22, 22, 25, 25, 28, 28, 31, 31, 34, 34, Other code 4, 4, 4, 4, 5, 5, 6, 6, 7, 7, 9, 9, 11, 11, 12, 12, 14, 14, 15, 15, 19, 18, 22, 22, 25, 25, 28, 28, 31, 31, 34, 34,?
TD H Ref. B ref. D Without coating 5, 5, 5, 5, 6, 6, 8, 8, 9, 9, 11, 11, 13, 13, 14, 14, 16, 16, 19, 19, 22, 22, 25, 25, 28, 28, 32, 32, 35, 35, With coating 5, 5, 5, 5, 6, 6, 8, 8, 9, 9, 11, 11, 13, 13, 14, 14, 16, 16, 19, 19, 22, 22, 25, 25, 28, 28, 32, 32, 35, 35, 4Y 5Y 6Y 7Y 8Y 9Y 10Y 12Y 14Y 16Y 18Y 20Y 22Y Dia.
A B ref. D Without coating With coating 0. Marking shall be recessed with max.