"The Relevance of the Yield Stress, Tensile Stress Ratio in Modern Mechanical Testing Requirements "

by "Michael Wright , Robert Glodowski "

Publisher - "Modern Metal Solutions Pte Ltd, Singapore & RJG Metallurgical, LLC., Pittsburgh, PA, USA "

Category - Engineering & IT

"As more varieties of high strength steels are being considered in the design of new structures, a question has arisen over the relevance of the yield-tensile ratio on the advanced behaviour of steels. The yield-tensile ratio has been a standard requirement in many Global standards for many years now, and has served its purpose well in traditionally made lower strength level steels. However, it may not be the optimum parameter required to define the properties of some of today’s steels behaviour in the inelastic zone of the stress strain curve. The shape of the stress-strain curve varies for different steel types. High strengths steel microstructures in the market today can have continuous yield curves, or with extended yield plateaus, or a combination of both of these curvatures. The region of the stress strain curve between the elastic limit and the ultimate tensile strength can vary considerably in shape, height and length, and yet can all appear the same if evaluated simply by using the yield-tensile ratio. The behaviour of the steels inside the plastic deformation zone is becoming more important for the design of structures to withstand the impact of unexpectedly high forces that may occur in an irregular manner, such as seismic events or explosive forces. The current yield-tensile ratio may be too simple to assist in understanding and defining the required properties of the steel in this region of the stress-strain curve and may need to be superseded by more sophisticated material properties measurements that are now available to us. "

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