목차
1. Introduction2. Theoretical background
2.1 Compressive stress-strain
2.2 Deformation modes in axial compression
2.3 Compressive properties and calculation
2.4 Method of data processing
3. Procedure of test
3.1 Preparing for specimen in test
3.2 Proceed the test of specimen
4. Result
4.1 Al 6061-O
4.2 Polycarbonate
5. Conclusion
References
본문내용
1. IntroductionMost materials’ behaviors are similar within tension and compression. However, some materials such as ductile metals show different behavior in compression comparing to tension. Therefore, it is needed to conduct compressive test when compressive properties are needed, and these are used in designing structure such as building, airplane and car or manufacturing process such as forging and rolling.
Meanwhile, compressive test has its own characteristic comparing to tensile. When the specimen’s ratio of length-to-diameter (L/D) is changed, compressive properties could be different. For that reason, each of Al 6061-O and polycarbonate specimens’ L/D ratios is different in this test. Through this test procedure, calculate the Young’s modulus and compressive yield strength by drawing each specimen’s stress-strain curve and test value and observe the deformation modes like buckling and barreling according to L/D ratios.
참고 자료
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ASTM, 2010, “Standard Test Method for Young’s Modulus, Tangent Modulus, and Chord Modulus”, ASTM International, E111-04, pp. 2.
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ASTM, 2012, “Standard Test Method of Compression Testing of Metallic Materials at Room Temperature”, ASTM International, E9, pp. 5-7.
ASTM, 2015, “Standard Test Method for Compressive Properties of Rigid Plastics”, ASTM International, D695-15, pp. 5, 7.
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ASM, 2000, “Heat Treating”, ASM International, Vol. 4, pp.1937~1939.