Abstract
A portable tensile test machine that can test mechanical properties of metal such as structural steel and aluminum has been developed. Small tensile specimens were manufactured that fit to KS code with gage length of 24 ㎜, cross section of 6 mm wide, and 1~2 ㎜ thick. Machine elements such as chain, ball screw, and linear guide were used to deliver toque generated by a step motor to the tensile specimen. The whole machine was tested for structural safety using CAE simulation program. Our results demonstrated that use of extensometer is essential in order to accurately measure strain in the test specimen. The stress-strain curves obtained in this machine were similar to those obtained in the commercial tensile test machine. The portable device can be easily and safely utilized in research laboratories as well as college class rooms. Inexpensive cost of small test specimen enabled us to repeat experiments without burdens.
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