The proof load for a M30 metric bolt grad 8. The required bolt clamping force for a joint is lbs. K - constant.į - axial bolt force or load N, lb f. The calculator is generic an can used for imperial and metric units as long as the use of units are consistent. The knee in the curve shows the point at which the joint separates.The calculator below can be used to calculate the torque required to achieve a given axial bolt force or load. The dark blue line gives the nominal bolt load, and the light blue lines account for preload uncertainty and relaxation. The Bolt Load Diagram below shows the tensile load on the bolt as a function of applied tensile load on the joint. The nominal value is the design target, and the min and max values account for preload uncertainty and relaxation. The table below summarizes the preload values. The minimum value of preload accounts for the preload uncertainty as well as relaxation, and is calculated as. Due to preload relaxationthere will be some loss in the preload after the joint is installed. Due to preload uncertaintythe actual preload applied to the bolt may be more or less than the nominal value. See this preload reference for more details. Honeywell high temperature shutdown resetĪ higher preload also allows you to get more utility out of the bolted joint up to a pointsince a higher preload increases the force necessary to separate the joint. This ensures that the clamped parts always remain in contact and in compression. Warning: The preload in this joint is unusually low. The installation torque is calculated as. The nominal preload force is calculated as. A summary of the installation parameters is given in the table below.
This section details the parameters relevant to installation of the joint. The joint constant is the stiffness of the bolt relative to the total joint stiffness. The grip stiffness is calculated considering that the parts in the grip act as springs in series. The table below shows the stiffness for each part. The stiffness of each part in the grip is calculated based on a simplified pressure-cone method, as described here. The bolt stiffness is calculated considering that the shank and threads in the grip act as springs in series. Basic Calculations for Bolted Connections The bolt length was rounded up to the preferred size of. The table below summarizes the factors of safety for the joint corresponding to the nominal, maximum, and minimum bolt load the bolt load varies based on preload uncertainty and relaxation. It is up to the discretion of the engineer to determine the appropriate factor of safety to use in design. Any factors of safety of at least 1 are shown in green, and below 1 are shown in red. These tables give the factors of safety for the joint and for the clamped parts.
Summary tables of results are shown below. Refer to the bolted joint analysis reference section for details on how these results were derived. The results of the bolted joint analysis are detailed below. Otherwise, reasonable default options will be selected for you. This section gives advanced options which can be modified if desired. See the reference section for details on the methodology and the equations used. See the instructions within the documentation for more details on performing this analysis. The Bolted Joint Analysis calculator allows for stress analysis of a bolted joint, accounting for preload, applied axial load, and applied shear load.
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