Metric fastener threads are also specified according to thread pitch, which is the distance between adjacent threads, again in millimeters. Design Strength of a Bolt (V db): A bolted connection should be designed such that the factored shear V sb shall not exceed the design strength V db of the bolt. Experimental work was carried out on universal Testing machine and specimen of bolted joint was tested to know ultimate shear strength of bolt. Ans. 52. (c)IES-7. This allows for higher torque levels, and thereby, improved spring clamping. In a bolt of uniform strength : (A) Nominal diameter of thread is equal to the diameter of shank of the bolt (B) Nominal diameter of thread is larger than the diameter of shank of the bolt (C) Nominal diameter of thread is less than the diameter of shank of the bolt (D) Core diameter of threads is equal to the diameter of shank of the bolt. A bolt of uniform strength can be developed by [IES-1995] (a) Keeping the core diameter of threads equal to the diameter of unthreaded portion of the bolt Page 26 of 429 (b) Keeping the core diameter smaller than the diameter of the unthreaded portion Thread Size Chart Stresses developed in a bar due to its own weight. A325 bolts in double shear. A. The U-bolt grade is a measure of the material's strength. The design strength V db of a bolt is the lesser of: (i) The design shear strength V dsb of the bolt, and (ii) The design bearing strength V dpb of the bolt. A single bolt is used to lap joint two steel bars together. Bar of uniform strength in which stress due to self-weight remains constant. Bolt of uniform Strength means that the entire length of the bolt is subjected to same intensity of stress,that is stress in the shank portion and the threaded portion are same.this is … Ô T = K( Æ T)n Where K is the strength coefficient n is the strain hardening exponent n = 0 perfectly plastic solid n = 1 elastic solid For most metals, 0.1< n < 0.5 The results from both simulation and experiment were then compared and show good agreement. Tensile force on the bar is 20,000 N. Determine the diameter of the bolt required if the allowable shearing stress on it is 70 MPa. (Under a load of 1960N {200kgf}, stripper bolt made of 4137 Alloy Steel, 33 to 38 HRC, strength class 10.9) The bolt that is located furthest from the I.C. i.e., V sb ≤ V dh. Although the overall, or tensile, strength is always higher than the yield strength, for a machine to run properly its bolts should have loads under the yield level. This is represented by the last number in a metric bolt’s designation. 19 mm ; C. 15 mm ; D. 12 mm ; 53. For example, a bolt labelled M10 x 1.5 is a metric bolt with a 10 mm diameter and 1.5 mm between threads. 2) If the bolt, like a stripper bolt, is to bear a tensile impact load, the right size should be selected from the fatigue strength column. Variation of stress in a stepped bar, uniformly tapered bar and uniformly tapered flat. is assumed to have a deformation of 0.34" The bolt force can be determined by a load-deformation relationship that has been experimentally derived from tests on 3/4" dia. A bolt’s overall mechanical strength can be measured by the degree of strain at which it finally breaks, while its yield strength designates the level at which it bends or deforms. 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