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the surrounding joint contains material to at least three times the bolt diameter). document.write(''); The actual value of dh that really should be used is the start of the stress frustum and not the diameter of the bolt head and/or washer. It should be noted that for a purely tensile load case (i.e., no shear so Rs = 0), Equation (51) has a margin of safety of zero when the joint exactly meets the factor of safety requirement regardless of the choice of X. For cases with a small alternating stress compared to the mean stress, there is little data. Subscripts will be described in the text. The complication of using Miner's rule for real parts, is determining the amplitudes and the number of cycles. Figure 2 identifies important geometric parameters for a thread joint. --> Alternative design bolts use design features that indirectly indicate tension. DFM DFA Training Otherwise, the Shigley method is recommended. This gives 2*N+2 equations in 2*N+2 unknowns which is easily solvable. Pulling, E. M., S. Brooks, C. Fulcher, K. Miller, Guideline for Bolt Failure Margins of Safety Calculations, Internal Sandia Report, December 7, 2005. To do this, a conservative estimate of the maximum and minimum preloads must be made, so that no factors of safety are required for these preloads. Thermal effects are important in many bolted applications. A bolted joint is constrained so the actual change in length will be the natural extension plus some amount (which can be zero) due to the constraints. The axial stiffness of the clamped material can be written as, Pulling, et. This is overly conservative and in general the NASA values should be sufficient. Calculation Example – Design bolted connection of tension plates (EC3) Create a free account and view content that fits your specific interests in structural engineering Learn More. The work of Wileman [17], Musto [10] and Morrow [9] are all based on this method and each is an extension of the previous work. the two "plates"). They assumed that the same material is loading in bending as was loaded axially. Subscripts not specifically identified in these tables will be addressed during discussions in the appropriate text. Design value in shear, kN Bolt and Threads Threads joint included in excluded from designation shear plane shear plane 4.6/S 44.6 62.3 8.8/S 92.6 129 8.8/TF 35.5 35.5 8.8/TB 92.6 129 *Slip factor = 0.35 Design for bolted structural joints A summary of structural design … Just to remind you, we’ll follow the ASME BPVC Section VIII Division 1 Appendix 2 ((ASME, “Mandatory Appendix 2 Rules for Bolted … One method recommended in this reference will be explicitly noted because it comes from an ASTM standard and is called Rainflow counting [2]. Engineering Calculators This generally means the joint must not separate at the maximum load to be applied to the joint. The data is taken from the Standard Handbook of Machine Design [15]. 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