Yield Strength / Stress…

Yield stress is a crucial property for metals as it determines their ability to withstand applied loads without permanent deformation. It indicates the point at which a material transitions from elastic to plastic deformation. This mechanical property is vital in engineering applications, as it ensures the structural integrity and stability of metal components under various stress conditions. The process of testing yield stress involves subjecting a metal specimen to gradually increasing loads until it reaches its yield point. This can be conducted using various methods, such as tension, compression, or torsion testing. By accurately measuring the yield stress, engineers can determine the maximum load a metal can sustain before it permanently deforms, allowing for the design of safe and reliable structures.

Simply we can say- The yield point is the boundary between elastic deformation and plastic deformation. Before the yield point, a material bends by stretching atomic bonds. Beyond the yield point, the atoms have stretched to their limit and further deformation happens because atoms move past each other. On a stress-strain curve, the yield point is the point where the curve is no longer straight.

How to perform YS test?

To check the yield stress of mild steel, you can perform a simple tensile test. First, obtain a small sample of the mild steel and mark a gauge length on it. Secure the sample in a testing machine, ensuring it is aligned properly. Apply a steadily increasing force to the sample until it starts to deform. Measure the force required to cause a noticeable elongation in the sample, which indicates the yield point. The yield stress can then be calculated by dividing the measured force by the cross-sectional area of the sample. This test allows you to determine the maximum stress the mild steel can withstand before it permanently deforms. It is important to conduct the test carefully and accurately, following standard procedures and safety guidelines.