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Let’s try to understand stress-stress curve with a stress strain diagram. Tensile modulus is often used for plastics and is expressed in terms 10 5 lb f/in 2 or GPa. Modulus of Elasticity, or Young’s Modulus, is commonly used for metals and metal alloys and expressed in terms 10 6 lb f/in 2, N/m 2 or Pa. Hence, we can write as per Hooke’s Law,Į = Young’s Modulus (N/m 2) (lb/in 2, psi) Stress is proportional to strain and it is known as Hooke’s Law. Stress vs strain relation is stated with the use of Hooke’s law, Compressive strain means the change in length by the application of compressive strain.Tensile strain means the change in length by the tensile stress application.Strain is related to deformation and it is defined as the ratio of deformation of the body in the direction of force applied to the initial dimensions of the body. Now, the application of force incurs deformation on the body. In the application of compressive stress, body will be shorter and thicker. It is the stress decreases length of a material or a body, it will be called as compressive stress.In the application of tensile stress, body will be longer in length and thinner. It is the stress increases the length of a material or a body, it will be called as tensile stress.It is denoted as σ (Sigma) and written as, Now, stress is defined as the force applied per unit area. If force is applied to a material, it can be stretched or compressed. Here, the concept of stress strain comes into the picture. We have already seen that we can stretch a rubber very easily and if we stretch it more at a certain point it will be broken.īut, what about if we try to stretch an iron rod? Will the iron rod be stretched? Or if it is stretched will it be broken? However, before going to the stress strain curve, we will try to understand what is stress and strain and the relation between stress vs strain. In case of fabrication, this curve helps a lot during its operation.It also gives material strength, elasticity, strain energy, elongation, toughness etc.It describes many properties of materials like Young’s modulus, ultimate tensile strength, the yield strength etc.It gives deformation point as well as criteria so that application can be easily studied.From vehicle to airplane, medical appliances etc., precision materials are required and this is selected based on stress strain curve only.In various industry, material selection is one of the main criteria and this diagram helps for the selection.Selection of right material is based on stress strain curve.We can easily understand the behavior of any material with respect to the application of stress. The importance of stress strain curve is very crucial, as it establishes the relationship between stress and strain. Strain is represented along the X-axis Why Stress Strain curve is required?.The methodology, experimental test, and the evaluated result are described in detail. Furthermore, the measured true stress–strain curve is approximated by the power law equation to identify the material constants. The test result is validated with the theoretical calculation as well as the experimental method. The true stress–strain curve including the post-necking data of DP780 is presented. A dual-phase steel with a minimum 780 MPa tensile strength (DP780), as a typical advanced high-strength steel (AHSS), is used in the test to demonstrate the method and to validate the result. The true stress is calculated based on the measured cross-section area and the load. The cross-section area of the specimen throughout the test is measured by the DIC, as well as the entire field true strain. A tension test with the standard dog-bone shape specimens is used in the system.
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The true stress–strain curve includes the post-necking strain, is directly measured via a special multi-camera digital image correlation (DIC) system. A quick method to directly determine the true stress–strain curve over a large strain range is proposed.