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What is the relation between ultimate and allowable stress?
ultimate stress=Factor of safety*Allowable stress
What are the Advantages and disadvantages of working stress design and ultimate strength design?
Ultimate strength design assumes the entire cross section of a member is subjected to its yield stress and will generally save material, but be less conservative given the same factor of safety.
What is the difference between Allowable Stress Design and Working Stress Design?
allowable stress design-2/3rd of yield working stress design is process yield
What does the grad st37 means?
ST 37 means the ultimate stress which the steel can withstand is 370 Mpa from this you can get the yield stress which equals 0.7 of the ultimate stress.
What is the ultimate stress of mild steel?
Allowable stress would normally refer to design using Allowable Strength Design, also known as working strength design. In this the allowable stress is usually a fraction of the yield strength and can be different for uniform tension and bending. Typically mild steel has a yield strength of about fy=250MPa with allowable stresses in Tension, 0.6fy=150MPa Bending, 0.66fy=165MPa
What is the difference between yield stress and ultimate stress in materials testing?
Yield stress is the point at which a material begins to deform permanently, while ultimate stress is the maximum stress a material can withstand before breaking. Yield stress indicates the material's ability to return to its original shape after being stressed, while ultimate stress shows its breaking point.
What are the differences in the stress-strain curves for different materials?
The stress-strain curves for different materials vary based on their properties. Some materials, like metals, show a linear relationship between stress and strain before reaching a point of yielding. Other materials, like polymers, may exhibit more complex curves with multiple stages of deformation. Additionally, the ultimate strength and stiffness of materials can differ, leading to variations in the shape and slope of their stress-strain curves.
Difference between ultimate strength design and working stress design?
Working stress method of design based on the elastic theory in which materials, concrete and steel are assumed to be stressed well below their elastic limit under the design loads. Working stressess (permissible stress) for the materials are determined by dividing the ultimate or yield stressess by suitable factor of safety values. Limit state method of design based on limit state concept, te structure shall be designed to withstand safely all loads liable to act on it throughout its life;It shall also satisfy the serviceability requirements, such as limitations on deflection and cracking. The acceptable limit for the safety and serviceability requirements before failure occurs is called a "limit state". The aim of design is to achieve acceptable probabilities that the structure will not become unfit for the use for which is intended, that is that it will not reach a limit state...
What is the difference of the elasticity of a material and its ultimate strength?
The elasticity of a material is the measure of it's elastic properties, how bendable it is. where as it's ultimate strenght is the force which you require to be able to break that material into 2
Why is fracture stress less than ultimate tensile strength?
Fracture stress is only less than ultimate tensile strength in an engineering stress-strain diagram. This is because the material will experience a maximum stress before it undergoes necking. After necking, stress will decrease again until the material snaps.
What is the relation between yield stress and allowable stress?
A factor of safety against yield is applied to design stress Yield Stress/ Design Stress = Factor of safety The factor of safety varies for different industries; 1.5 is used in structural steel design for buildings; 1.25 or even 1.1 for aircraft/space systems
What is the ultimate stress?
Ultimate stress, also known as ultimate tensile strength (UTS), is the maximum stress a material can withstand while being stretched or pulled before failing or breaking. It represents the peak point on the stress-strain curve of a material, beyond which it experiences permanent deformation or fracture. This property is crucial in engineering and materials science, as it helps determine the suitability of materials for various applications.
