How do you calculate tensile strength

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Tensile Strength. Tensile Strength TS Ultimate tensile strength UTS , often shortened to tensile strength TS or ultimate strength, is the maximum stress that a material can withstand while being stretched or pulled before failing or breaking. Importance Tensile tests are used for controlling product quality, and for determining the effect of chemical or thermal exposure on an elastomer. Tensile Strength Measurement Tensile strength is defined as a stress that is measured as force per unit area.

There are three typical types of tensile strength: Yield strength — The stress a material can withstand without permanent deformation. If so what calculation do you use to gather that information? David- No, as long as you do not use heat like a cutting torch to cut the bolt, the mechanical properties should not be altered.

Are there industry standards in hardness Rockwell for specific grades of bolts primarily metric — what would a failed hardness test indicate in a bolts tensile strength? In example, Bolts test out at HRB. Would this be an indication of poor quality control during production? Suggestions on 3rd party laboratory testing facilities? Jerod- HRB hardness readings would indicate a strength close to mild, low carbon steel grade 2, 4. If your In ACI clause Mark- Nominal steel strength is not necessarily an exact equivalent of yield.

I was not able to find an exact definition in ACI, but sections 4 through 6 in appendix D discuss steel strengths in detail. I am currently working on a project that involves the use of a hydraulic torque wrench to tighten a series of nuts on an oil field blow out preventer or otherwise known as a B. So what I need to know is how many foot pounds of torque would be required to tighten these heavy hex nuts.

Therefore here are the figures:. Torque tool generates up to 10, PSI of hydraulic pressure at testing or proving. Note: Hydraulic torque wrench would be as manufactured by companies like Titan Technologies, Hytorc, Wren etc. Mario- It is difficult for us to make specific torque recommendations because every application is different and because torque is a tricky animal. We can then calculate a ballpark torque value, but you would still want to verify that before installation.

You multiply that by 0. Hello I was looking to write a test method validation for an elongation test which will be in compliance with the EN clause Can you tell me how can I do that?

General question is tensile strength rated for the bolt being loaded and torqued? Does tensile strength fall off if the bolt is loose, but still has thread engagement with the nut?

Brad- The tensile strength of the bolt does not change if it is loose, as long as it is still engaged in the nut at least one diameter. If it is engaged less, then it is possible that the assembly will fail probably through nut stripping before the ultimate tensile is achieved. You would need to tell us what diameter and grade to fabricate. Is there have any industries standard value for the tensile strength of self drilling screw? Rezza- we are sorry, but we do not have any information about self drilling screws.

We primarily handle larger, custom anchor bolts. Is it possible to estimate the effects of torsion torque on a bolt in relation to its yield and tensile strength?

Thank you. Andy- We are not certain what exactly you are asking. We can calculate the torque needed to achieve a specific load, but the effects of torsion on yield? We are not sure. Kamlesh- I am sorry, but are not able to make recommendations for specific applications like this.

As I understand it, in simplist terms, tensile strength is the force required to pull a bolt apart and yeild is the force required to deform it to the point where it does not fully recover.

On metric bolts it is listed as a percentage of tensile strength 8. I was wondering how the tensilestrength of the bolt related to the thread strength. I never realized that the bolt would fail before the thread, with sufficient engagement and a female thread of equal strength.

How badly does a full thread bolt affect shear strength when it is used in place of a partial thread bolt where the unthreaded part was in the stress or shear area? Thanks, Jeff. Jeff- Yes, the bolt will always fail in tensile as opposed to thread stripping, unless there is a problem like loose threads or weak female material.

That is simply due to the minor root diameter of the threads vs the full diameter of the shank. Of course, the siding would likely pull away from the house first, but…. If they think carefully, a competent person can figure out what will work.

When in doubt, call an engineer. You may be surprised how willing they would be to work with you, especially if it is an interesting project. Chris- You are correct, I should have qualified that if the bolt is improperly designed or installed, it could strip.

I will edit. Thanks for the catch. I would assume that when quantifying strength of any structural component that it is implied that it is assembled properly. Of course there is possibility of failure if all is not right. To require stipulation that it must be installed properly is silly.

Anyone with the competence to calculate tensile strength would already know this. Essentially, I am making a barbell, and will have weight plates on both ends of the bar. If that is the case, we do not have that equation. We also would need to know the condition of the bar — that is if it was cold drawn, and if so, whether it was a normal draft or heavy draft as that can effect the strength of the bar.

The tensile of the bar would be 60,lbs. The yield would be 54,lbs, and the shear would be 36,lbs. You want the bar to be able to bend so you can still pick it up , but not bend permanently.

How can I calculate the thread strength depending of the length of engagement of a bolt in a metal plate? The plate material tensile strengths are : Ultimate : 78ksi Yield : 44ksi Also the shear modulus is ksi. Samuel- I am not sure how to calculate that, but what I can tell you is that, beyond a certain point, additional thread engagement does not add any more strength, only cost.

These are such interesting questions! Yes that is a good analysis and rule of thumb on thread engagement. That configuration should be able to carry a hefty static tension load. If it is a large swinging or bouncing load, get an engineer to look at it. Chano- In a straight line pull, the length of the bolt is irrelevant. The breaking point is the tensile stress area multiplied by the minimum tensile in psi. If your joint is more complicated, and if there are forces that are not in a straight line, then you will need to consult an engineer.

How do I determine the yield and tensile strength for a specific diameter of a aluminum stud? Frederick- You would multiply the tensile stress area of the stud by the yield and tensile in psi of the aluminum.

We, however, do not have any strength information about aluminum. Hello I am seeking the tensile strength of a 1 inch thick a36 steel bar with a 1 inch hole threaded for national coarse thread. I want to know the tensile strength of the threads in the steel. Also I would like to know the same exact thing but for a 2 inch bar of the same steel. Please help I can not find anywhere.

Kelly- This FAQ shows you how to calculate the strength of both bars, however we do not know how the addition of that hole will effect the mechanicals. It will likely be determined by the location of the hole relative to the placement of the nut. Aman- In order to help you with this question, we would need to know the grade of bolt and nut, as well as how the fastener is being used.

Thanks in advance. Hi, I have been trying to find a comparison chart to determine at what torque in NM a bolt would go into yield in this case a M20x2. Success- Each individual manufacturer of eye bolts has a chart that lists what their bolts are rated at.

You will need to contact the manufacturer of your specific eye bolt to obtain that information. Steel tube between the spool ends.

I need to know how much pull weight can be placed on the shaft before it will bend. Hi, I am new to metal industry, have a doubt. About the standards in Metals, bcoz there are different grades and standards.

So to understand what is the impact that happens on metal with the standard, whether it is the change in Chemical composition or other mechanical properties. Tensile stress parameters are extremely vital in the construction industry because building materials are required to withstand loads from a variety of sources without failure.

Additionally, the tensile strength limits of materials dictate how buildings and bridges will behave when subjected to dynamic l oads , such as wind and seismic events. The tensile strengths of materials are typically provided in specifications prepared by steel manufacturers. Structural engineers then use a variety of tools, such as computer modeling and hand calculations, to determine the applied stresses in structural members.

The applied tensile stresses are compared to the corresponding strengths to assess the suitability of the selected materials. The consequences can be serious if materials are improperly selected. For example, in April , a six-story building in Uganda collapsed due to the use of counterfeit materials that possessed inadequate tensile strength properties.

In the automotive sector, tensile stress calculations are used to select materials for various vehicular components, from bumper moldings to interior fittings.

Material strength properties for automobile parts and components are tailored for specific applications. For example, the grade of metal used in engine framing is different than that used on the doors and pillars. Other automobile components in which tensile stress calculations play a crucial role include trims, number plates, electrical harnesses and exterior fittings. The aerospace industry requires materials that are suitable for high-performance and precise applications.

Even the slightest miscalculation of tensile stresses can have catastrophic consequences. Aerospace engineers must frequently select materials with the appropriate combination of tensile strength, ductility and weight to strike the perfect balance between safety and fuel efficiency.

While tensile testing and calculations are commonly associated with metals, they are also essential in assessing the performance of paper and plastics. In the packaging industry, wrapping needs to be elastic enough to stretch over products of different shapes and sizes while possessing enough strength to resist rupture and tears.

Tensile testing is one of the most widely used assessments performed on materials. By testing a specimen to its breaking point, engineers can use tensile capacity values to predict how materials will behave in their intended applications. Tensile stress calculations can also help to identify where specific components may require additional strengthening or improvement. While generally associated with metals, the behavior of almost all materials, from steel and aluminum to concrete and plastics, are influenced by their tensile strengths.

It is, therefore, essential that this parameter be tested and calculated as accurately as possible to avoid potential disasters. Written by Krystal Nanan Civil Engineer.

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