Check out these ways to calculate torque
The mechanical engineering has been one of the largely developed an advanced filed that aims to develop a variety of devices that can be brought to functioning by the help of using bolts. There are different types of bolts which can be used at different places by the intention of the different functions that the bolts can perform. The operation of the machine can be largely influenced by changing the movement of or the position of any bolt. And therefore, changing the position of even a single bolt can create a drastic change in the functioning of a device. So, as per the expectations and the requirements of the project, the bolts are responsible for holding various parts of the machines all together and facilitate synchronisation.
The current problem lies within the selection of an appropriate method for tightening of bolts. Because the incorrect tightening method leads to the insufficient preload and as a consequence, bolted joint failure occurs. So, it is the prime responsibility of the designer to correctly examine what are the right methods that should be used for the bolt tightening and the associated characteristics.
There can be two different methods that are highlighted which can be used for the bolt tightening which are described as follow:
1. Using bolt tightening machine
2. Using Torque table for bolt tightening
Usage of bolt tightening machine can be considered as a widely accepted method for controlling preload because it can control the torque which is related to tightening of the fastener. The torque table for bolt tightening or the mathematical calculations can be used to determine the relationship between torque and the bolt tension resulting from the torque, can be used for estimation of the torque.
Due to the tightening of the bolt, shank experiences the stress as a result of elongation strain and in association with torsion stress. The torque acting on the threads also plays a role. In 75% cases, the torsion stress is usually taken by almost all the tables along with direct stress that is present in the threads of the bolt.
But where there are high frictional conditions, torsion stress is linked with direct stress which leads to failure. When the direct stress is coupled to torsion stress, it is always better to estimate the magnitude and hence, the equivalent stress is then proportionately calculated. And its efficiency is 90%. Hence bolt tightening calculations can be done to fasten bolts.
Those fasteners that prevails torque can be sued in case the vibrations are loosened. Such fasteners can be Cleve loc or nyloc cuts. Hence, using such fasteners that prevail the torque can increase the torsion stress. Hence, using this way, the correct value of torque can be measured.
Therefore, it can be easily concluded that the torque tightening is a major problem because in most of the conditions, torque is applied to prevail over friction which constitutes for the 85% to 95% of the torque that is applied.