This is a factor of safety. Ultimately, the amount of stress and overload a structure can handle comes down to the material used to build it. Engineers perform strength tests to determine how much weight a material can handle. Certain materials are more ductile than others, meaning they deform to pressure before breaking more so than others, like brittle materials.
Brittle materials simply break once they meet the maximum force. Ductile materials use the yield strength to determine the safety factor. Brittle materials use the ultimate strength. Ductile materials often test the factor of safety against yield and ultimate strengths while brittle materials usually only calculate the ultimate safety factor since the yield and ultimate values are often so close.
The necessary factor of safety of any structure determines the materials used. This website is my first venture into the world of blogging with the aim of connecting with other piping engineers around the world. Your email address will not be published. Save my name and email in this browser for the next time I comment. For more than 50 years, Hydrogen piping and pipeline systems are in use. There are several hundred miles of hydrogen pipelines that are laid to transport hydrogen to serve as fuel.
Even though These are floating vessels over the sea used for the production, storage, and off-loading of crude oil. FPSOs are very important Skip to content. Join us on Telegram. The extent of initial stresses set up during manufacture.
The extent of loss of life if a failure occurs. A higher factor of safety is chosen if there is more risk of life. Factor of safety is a ratio of maximum stress withstand by an object to applied stress.
Whenever a Factor of safety is greater than or equal to, then the applied stress is less than or equal to the maximum stress so the object can withstand load. But when the ratio is equal to. The high factor of safety results in unnecessary risk of failure. There are many factors as 1- materials strength if the materials is a brittle or ductile 2-possible misuse: the designer must consider any responsible of for foreseeable use 3-loading static.
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Save my name and email in this browser for the next time I comment. Perhaps one of the most important qualities to be considered when creating parts or products is safety A very basic equation to calculate FoS is to divide the ultimate or maximum stress by the typical or working stress.
A FoS of 1 means that a structure or component will fail exactly when it reaches the design load, and cannot support any additional load. With the equation above, an FoS of 2 means that a component will fail at twice the design load, and so on. Different industries have different ideas on what a required margin of safety should be ; one of the difficulties associated with using a FoS or SF is some measure of ambiguity.
But there are some general rules of thumb across multiple verticals. Obviously, if the consequences of failure are significant, such as loss of life, personal harm, or property loss, a higher FoS will be required by design or by law.
Another consideration is cost: how much extra does it cost per part to achieve a certain FoS, and is that a viable business model?
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