How do you calculate bolt clamp force?
Clamp load (lb.) is calculated by arbitrarily assuming usable bolt strength is 75% of bolt proof load (psi) times tensile stress area (sq. in.) of threaded section of each bolt size. Higher or lower values of clamp load can be used depending on the application require- ments and the judgement of the designer.
How do you calculate tension value?
The Torque/Tension Equation is a method used to estimate the torque/tension relationship in an assembly. T = (K D P)/12 can be used to developt a torque value that will achieve a certain tension or clamp load.
How much force can a bolt take?
Steel bolts are graded according to newtons per millimeter squared for bolt tensile strength as compared to yield strength. For example, a steel bolt with a rating of 5.5 will provide roughly 500 newtons/mm2 of bolt tensile strength and approximately 400 newtons/mm2 of yield strength.
How do you calculate residual bolt stress?
Important formula : (A) Residual Bolt Load = Bolt Stress x Bolt Tensile Stress Area = (Bolt Stretch x Modulus of Elasticity x Bolt Tensile stress area) Effective Length.
What is tension force and its formula?
The pulling force that acts along a stretched flexible connector, such as a rope or cable, is called tension, T. When a rope supports the weight of an object that is at rest, the tension in the rope is equal to the weight of the object: T = mg.
How to calculate the tension of a bolt?
Check the following connection for tension force NEd=600KN. S275, bolts M20/5.6. Shear at full section.
When to use a hydraulic bolt tension calibrator?
Using a hydraulic bolt tension calibrator you test a bolt at this torque only to find that it doesn’t give you the required tension of 84 ksi; due to your conditions you are only getting a tension of 78 ksi. Now you use the calibrator to learn what torque you will need to apply to that bolt in order to give you the needed tension of 84ksi.
How to calculate the torque of a M30 metric bolt?
The proof load for a M30 metric bolt grad 8.8 is 373000 N. The torque required to achieve this tension with a dry bolt can be calculated as Lubricating the bolt with SAE 30 oil reduces the torque required to achieve the same tension with approximately 40%. The reduced torque can be calculated
What should the torque of a bolt be?
Note that standard dry torques are normally calculated to produce a tensile stress – or axial force or clamp load – in the bolt that equals to 70% of minimum tensile strength or 75% of proof strength. The required bolt clamping force for a joint is 20000 lbs.
What do you need to know about bolt tensioning?
Bolt Stress = Bolt Load / Bolt Tensile Stress Area Bolt Load = Bolt Stress x Bolt Tensile Stress Area Tool Pressure = ((Required Bolt Load x LTF) / (Tool Hydraulic Area)) Safety Notes Never exceed the Tensioner maximum working pressure Never exceed the Tensioner maximum piston/ram stroke • Series: Tips on Bolt Tensioning
Why do TenTec use pressure A and B?
Tentec refer to these pressures as Pressure A and Pressure B. These two pressures are necessary in or- der to compensate for the bolt load loss that occurs when a bolt is tensioned adjacent to an already tensioned bolt. The already tensioned bolt looses load as load is being applied to its adjacent partner.
How can you measure tension on a fastener?
Ultrasonic Bolt Tension Monitors (Extensometers) allow the bolt installer to ultrasonically measure the actual load, stress, and elongation produced by tightening a threaded fastener of any material. Laboratory as well as hand-held portable sized units are available.
Note that standard dry torques are normally calculated to produce a tensile stress – or axial force or clamp load – in the bolt that equals to 70% of minimum tensile strength or 75% of proof strength. The required bolt clamping force for a joint is 20000 lbs.