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How to calculate the yield point of seamless square tube

Published Time:

2018-07-17

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Summary

For metallic materials exhibiting yield phenomenon, the stress at which the specimen continues to elongate without any increase in force (the force remains constant) during tensile testing is called the yield point. If the force decreases, the upper and lower yield points should be distinguished. The unit of yield point is N/mm2 (MPa).

How is the yield point of a seamless square tube calculated?

　　For metallic materials exhibiting yield phenomenon, the stress at which the specimen continues to elongate without any increase in force (remains constant) during the tensile process is called the yield point. If the force decreases, the upper and lower yield points should be distinguished. The unit of yield point is N/mm2 (MPa).

　　Upper yield point of square tube (σsu): The maximum stress before the force first decreases when the specimen yields;

　　Lower yield point of square tube (σsl): The minimum stress during the yield stage when the initial instantaneous effect is not considered.

　　The formula for calculating the yield point is:

　　Where: Fs -- Yield force (constant) during the tensile process of the specimen, N (Newton);

　　So -- Original cross-sectional area of the specimen, mm2.

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