Journals Proceedings

Abstract

Performance of a structure is usually determined by the amount of permitted deformation. Some measured properties that must be considered when designing a cold formed steel structure include tensile strength, yield strength and modulus of elasticity. The other important property is ductility that is the ability for plastic deformation in tension or shear. Ductility controls the amount a material can be cold formed that is the process used when producing cold formed steel members. Steel properties that have direct or indirect influence on formability and structural element performance are tensile strength, yield strength and modulus of elasticity, ductility, hardness, stress hardening exponent, plastic strain ratio. All of these parameters can be determined by tensile test, except hardness. The stress strain curve is generated by pulling a metal specimen under axial tension to failure. ASTM E8/E8M Standard Test Methods For Tension Testing Metallic Material used for determination of tensile strength, yield strength and modulus of elasticity, percent elongation at failure and reduction of area. The robust tension test can be done by reliable test specimen preparation process. Test specimen can be prepared by different methods by cutting specimen form sheet metal. Common methods are for cutting sheet metal will be investigated. Inspected methods are computer numerical control laser cutting, plasma cutting and wire electrical discharge machine cutting. All these methods have own advantages, but different effects on specimens. These effects on specimen are not only production of high precision test specimen, but also heat effects and different roughness values at cutting surface on the test specimen. In the present study, an attempt has been made to investigate the effect of cutting methods on the tension test specimen. As a result, investigations will be conducted to determine the most favorable method for preparing tension test specimen for design of cold formed steel member.