Table of contentsWhat is destructive testing and non-destructive testing?Tensile testingRockwell hardness testPenetrant testingMechanical properties and applicationConclusionThis assignment concerns different types of testing such that: Tensile tests; Rockwell hardness tests and penetrant tests of various metals such as: Brass; Mild steel; Aluminum; Stainless steel and carbon steel and their results. Say no to plagiarism. Get a tailor-made essay on “Why violent video games should not be banned”? Get an original essay What is destructive testing and non-destructive testing? With destructive testing such as (tensile testing and tensile testing Rockwell hardness), we engineers can roughly identify the mechanical properties if it is ductile, brittle or malleable and what pressure it experiences if its compression is a compressive force; tensile force which is a tensile force; Bending is the stress exerted in a material just before it fails in bending; A shear which is a cutting force or a twist which is a twisting force. We use these tests to approximate the material's breakage/failure point. Non-destructive testing such as penetrant testing allows us engineers to identify failure points in the material without damaging it. We can use the end result to determine how to properly repair the material to achieve a smooth finish. Testing of materials and components is necessary because it allows the engineer to find the best material for the product if it is durable and corrosion resistant and not ductile or brittle. If it is fragile, that means there is no shrinkage, which means it will be hard to see when it breaks. Tensile TestingTensile testing is a way of determining how something will react when taken apart, the data from the results can be used in many ways such as: determining batch quality; determine manufacturing consistency; to facilitate the design process and ensure compliance with international and industry standards. Firstly, during setup, we measured the materials we got, namely brass; Mild steel; Aluminum and stainless steel along the length and marked the middle, we then marked 4 x 1 cm points on either side of the middle and converted the cm to meters. After marking the material, we measured the diameter of the bar and calculated the area with the equation CSA=π (d squared)/4. Secondly, once we marked the materials we then placed them into the machine where we clamped the bottom end and the top end and slowly the machine pulled the material until it fit snaps on some metals. We see it shrinking where it gets thinner and then snaps, we can see this through the results and pictures.Rockwell Hardness TestRockwell hardness test is a method of measuring the hardness of materials by pressing an indenter into the surface of the material with a specific load, then measuring how far the indenter was able to penetrate the surface. The date we tested the materials was September 18, 2018 at ambient temperature 23°C with the test and the standard: ISO 6508-1:2015 metallic materials - Rockwell hardness test - part 1 When setting up the equipment, we used the B afraid of the Rockwell hardness test which was the hardness unit "HRBW" , we first set up the Rockwell hardness test by inserting the metal plate where the materials go, then we mounted it until the little arrow was on the black dot ofthe scale, secondly, once done, we loaded the sample containing one of these elements (Brass; Aluminum and Mild Steel), we tested all these elements one after the other. After the sample was loaded onto the plate, we lifted the sample to the point where the indenter lightly touched, then pressed the under pressure button to load the test, then pressed it again to perform the test. Testing. The results we got for mild steel were 84HRBW (the number means Rockwell hardness value; HR means Rockwell hardness; B means Rockwell scale and W indicates using a tungsten carbide ball. penetrator). The results for aluminum were 26HRBW and the results for brass were 30HRBW. All of these results were carried out under the same testing conditions to make it a fair test.Penetrant TestingPenetrant Testing is a widely applied, low-cost inspection method used to check surfaces. breakage defects in all non-porous metals such as: metals, plastics or ceramics. This allows us engineers to determine defects in materials without damaging them so we can correct them for use in the design process. We did this test first, it can be anything from grinding and metal brushing to just wiping the part with a cloth. moistened with cleaner/removal agent. The surface must be free of dirt, rust, scale, paint, oil and grease, and smooth enough to wipe off the penetrant without leaving residue. Secondly we applied the penetrant, this is usually done by spraying the penetrant from the aerosol can or applying it with a brush. A residence time (soak) must be observed to allow the penetrant to penetrate cracks and voids. This usually lasts 5-30 minutes, but should never be long enough for the penetrant to dry. Third, we have removed the penetrant, all penetrant should be removed with clean, dry, lint-free cloths until completely clean. The part or material should be scrubbed vigorously until the penetrant is no longer visible on dry rags. Next, the cleaner/remover should be sprayed onto another clean, dry, lint-free cloth and used to vigorously scrub the part again until there is no more penetrant visible on the cloth. Finally, we sprayed a thin, light layer of spray developer onto the part being examined. A residence time must be respected to allow time for the dye to emerge from the defects and create an indication (defect) in the developer. Developer dwell time is typically 10 to 60 minutes. Then the defects should be visible to us engineers. My results could be different from the actual results due to different factors such as: the Rockwell hardness machine we used was old and needed to be repaired or replaced with a newer version/model, the surface of the machine Rockwell hardness had to be a hard metal surface where ours was on a desk supported by 4 metal supports. The environment would have been better in a metals workplace rather than doing the test in a classroom and as our Rockwell hardness machine is old and requires a newer version/model, calibration could be a little loose, leading to false readings. Mechanical properties and applicationAluminum is a light, silver-white metal. It is soft and malleable. Aluminum is used in a wide variety of products including cans, aluminum sheets, cookware, picture frames.