ME 330 vishrut khaitan lab 1 report.docx - Vishrut Khaitan...

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Vishrut KhaitanNetid : vishrut2Section : AB7Date : 18thSeptember 2019HARDNESS AND COMPRESSION TESTINGLAB 1ME 330
Table of ContentsAbstract …………………………………………………………………………………..…........21.Introduction1.1 Hardness ……………………………………………………………………………... 31.2 Brinell Scale ...………………………………………………………...……………... 31.3 Rockwell Scale ...……………………………………………………...……………... 31.4 Compression...……………………………………………….……...………………...31.5 Stress and Strain ...…………………..………………………………...………………42.Procedure2.1 Equipment and Material ………………………………………………………………42.2 Brinell ………………………………………………………………………………...42.3 Rockwell ……………………………………………………………………………...42.4 Compression Procedure ………………………………………………………………53.Results3.1 Hardness data…………...……………………………………………………………. 53.2 Compression Test Plots………………………………………………………..…… ..63.3 Properties Tabular Data………… …………………………………………..……. …73.4 Specimen Images……………..……………………………………………………….84.Discussion4.1 Hardness Test Discussion………………………………………………………… ….94.2 Compression Test Discussion…………………………………………………………95.Conclusion………………………………………………………………………………… ..106.Acknowledgements ………………………………………………………………………....107.References …………………………………………………………………………………...101
Abstract:This lab presents results on hardness and compression tests. The Brinell and Rockwell B and Chardness scales are used to measure 4340 steel and 7075T6 Aluminum. The mean, median andstandard deviation are used to show the Brinell scale characterizes both materials while theRockwell scales have higher accuracies at the cost of only being able to characterize onematerial. Additionally, the compressive properties of cast iron, 1045 steel, 7075T6 Aluminumand PMMA are found. The elastic modulus, yield stress/strain, and fracture stress/strain arefound. 1045 Steel has the highest elastic modulus. Cast Iron undergoes the least strain whilePMMA, which was the only material tested to fracture, had the lowest elastic modulus buthighest strain.1.Introduction:1.1 Hardness:Hardness is a measure of durability, defined as the ability to resist plastic—permanent—deformation.1The first standardized test was developed in 1820 by Friedrich Mohs to rankmaterials against each other.2Mohs decided on ten materials that served as benchmarks for hisscale, Table 1. A material was ranked on this scale using the scratch test; it receives the numberof the highest number that it could scratch. The Mohs scale is relative and qualitative by design,and new scales needed to be developed to better quantify hardness. The Brinell and Rockwellscales are commonly used scales, which have replaced the Mohs scale. The Brinell scale wasdeveloped in 1900 by J. A. Brinell.2It encompasses a wide range of hardness values, allowing itto be used as a reference to compare narrower scales at the cost of lower accuracy. The Rockwellscale was developed to account for Brinell’s low accuracy as well as portability. The Rockwellscale is a family of scales that measure the depth of indentation to find the hardness; each isdefined by a unique applied force and indenter to classify a range of hardness, listed in Table 2.

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Term
Fall
Professor
Downing
Tags
Cast iron, Rockwell, Rockwell scale, Brinell, brinell hardness

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