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Q: Why Aluminium has no lower yield point like Mild Steel?
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Why the mild steel have two yield points?

Low carbon steels suffer from yield-point runout where the material has two yield points. The first yield point (or upper yield point) is higher than the second and the yield drops dramatically after the upper yield point. If a low carbon steel is only stressed to some point between the upper and lower yield point then the surface may develop Lüder bands.


What is the Difference between the Upper and lower yield stress in mild steel?

Lower YS is that point at which the steel flows elastically and failure takes place at upper YS.


What is mean by yield strength of steel?

The steel has a ductile material properties so that it could be elongate at a point of ultimate yield point.It is stable while before the break point


Is tensile strength of cold rolled steel is greater than yield stress?

For ductile materials, the yield stress is always lower than the tensile strength of the material. For brittle material they can usually be considered the same point. Steel is generally considered ductile.


When does the yield strength of a rectangular metal wire say stainless steel or titanium wire increase?

If you work it beyond the yield point then you raise the yield point in a process called strain hardening


Is there a general rule for yield vs tensile strength in steel?

yield is the breaking point and tensile strength is what it is rated at per square inch


Why stress increased again after lower yield point?

hi dear, yes its true that stress increases after lower yield for ductile material. it happens due to reason of strain hardening. strain hardening is the property of the material with which the grain structures presents in the body forms bond between them. so in order to break that bonds, the stress increases after lower yield point..


What does ksi yield mean on steel?

The yield strength of steel, expressed in ksi (kips per square inch), is a measure of the stress at which the material begins to deform plastically. It represents the point at which the material transitions from elastic deformation to plastic deformation, and is an important factor in determining the structural integrity of a steel component.


Yield stress of tool steel?

The yield stress of tool steel is the amount of stress that a material can withstand without experiencing permanent deformation. The yield stress of a specific type of tool steel can vary depending on the specific composition and manufacturing process of the steel. In general, tool steels have high yield stresses, typically in the range of 1000 to 2000 megapascals (MPa). This allows them to withstand high levels of stress and strain without deforming permanently. For example, the yield stress of high-speed steel (HSS) can be in the range of 1500 to 2000 MPa, while the yield stress of cold-work tool steel can be in the range of 1200 to 1600 MPa. Overall, the yield stress of tool steel is an important property that determines the material's ability to withstand high levels of stress and strain without deforming permanently.


What material is more brittle wood cast iron steel or glass?

Cast iron is very brittle in its basic form, with yield point very close to fracture point. However, glass is the most brittle, having no yield point - it is perfectly elastic before failure


Is mild steel ductile at room teperature?

Yes, it is - it has a yield point and can strain quite a bit 20% or so before failure


Why the yield point occur in the stress-strain graph of mild steel?

Once material is stressed. dislocations present in it starts to move and gather near grain boundary. These dislocation are repulsive in nature and resist further movement, hence yield point occurs. Once dislocations crosses the grain boundary, there is very less amount of force required to keep them moving, hence yield point phenomenon appears i.e. less amount of force is required.