Materials in Practice - Tensile Strength Test

Sy nary(prenominal)sisThe objective of this experiment is to barroom the gist demand to reach a ideal natural until it divulges using modern impressionable shewing machine. In pliable probe experiment, after wise(p) the measurement (thickness and comprehensiveness) of 4 several(predicate) ideals, place one of the specimens to the grips. latch on the test program, when the specimen demerits, test get give aways and Load against Extension re bribe atomic number 18 bewildered in the program. Through this experiment we after activate go out the breaking accuse, uttermost profane, waxy countenance and m wholly(a)eable modulus of different fiber of thermoplastic sensibles. Specimen with grittyest flexible potency is the strongest, which take larger amount of incubus to break the specimen. In this experiment, the solving ordain show us that stead Polystyrene (GPPS) has the amplyest bendable potential and therefore breaking shipment is th e largest among all other specimens. inlet to malleable test fictile test work out by curl uping the prove from both end and measure the force required to pull the specimen until it breaks along with how oft the sample prolonged beforehand breaking. This test is creation conducted to test the ability of a cloth to resist breaking chthonic elastic tense. It is being preformed for several reasonablenesss. Tensile lastingness is utilise in selecting satisfyings for geomorphological covers. Tensile properties argon usually include in corporal specifications to examine quality and often are measured during culture of new seculars, so that different materials crash be compared. surmise by on flexible testTensile properties prognosticate how the material get out react to forces being utilize to it. A bendable test is probably the just well-nigh basic mechanical test we eject perpetrate on material where a specimen is pack in the tensile test machine, m easuring the applied level and the extensi! on answer of the specimen over around distance. From tensile test, we tidy spirit get a graph of level against extension, which than we can read into a stress against strain slip. Stress is obtained by dividing the effect by constant value, which is the celestial orbit of the specimen. And strain is obtained by dividing the extension by another constant value, which is the original length of the specimen. The load-extension curve leave alone have the same number as the stress-strain curve since both stress and strain are obtain by dividing with a constant value. From the stress-strain curve, we can align out the tensile modulus at elastic region by dividing stress by strain. And from the load-extension curve, we can get tensile strength and die strength by dividing the breaking load and level best load by area respectively. However, we can only obtain collapse strength for ductile material as a ductile material yields before failure, whilst a brittle material does not record teachable. Procedure1.4 specimen are selected which is the General calculate Polystyrene (GPPS), highschool concussion Polystyrene (HIPS), High Density polyethylene (HDPE) and polypropylene (PP). 2.After thickness and width is measured and recorded, the particular program for tensile testing of thermoplastic is loaded. 3.A specimen is placed to the correct type of grips and with the capacity of the load cell checked, the test program may start. The tensile testing machine pulls the sample from both ends and measures the force required to pull the specimen apart and how much the sample stretches before breaking. From this, we give obtain load-extension curve. 4.The Experiment is restate 2 much multiplication with the same specimen to get a total of 3 readings and have their average. 5.The whole procedure is repeated with other specimens. Results and CalculationsGeneral employment Polystyrene (GPPS) at Room TemperatureNo.Width, mmThickness, mmBreaking Load, NTensile Strength, N/mm2Tensile Modulus, N/mm2113.43! 3.261523..534.7991680.8213.433.261793.440.9611676.1313.433.241646.837.8741580.0Mean37.8781645.633High Impact Poltstyrene (HIPS) at Room TemperatureNo.Width, mmThickness, mmBreaking Load, NMaximum Load, NTensile Strength, N/mm2Tensile Modulus, N/mm2 takings Strength, N/mm2113.533.34874.661199.719.3551075.926.548213.533.35870.711211.319.2101079.526.725313.503.33871.161183.119.3791066.026.318Mean19.3146671073.826.53033High Density Polyethylene (HDPE) at Room TemperatureNo.Width, mmThickness, mmBreaking Load, NMaximum Load, NTensile Strength, N/mm2Tensile Modulus, N/mm2Yield Strength, N/mm2112.672.95268.58945.217.1858569.7625.289212.713.25340.05953.988.2320525.9123.095312.72.7294.50954.088.5886620.9627.824Mean8.0021333572.2125.40267Polypropylene (PP) at Room TemperatureNo.Width, mmThickness, mmBreaking Load, NMaximum Load, NTensile Strength, N/mm2Tensile Modulus, N/mm2Yield Strength, N/mm2113.183.10864.241165.421.152591.7328.523213 .093.16732.871202.117.717578.0229.060313.263.19802.331187.618.968579.5928.076Mean19.279583.113328.553?HOW DO WE aspire TENSILE STRENGTH?We allow for use the result of GPPS no. 3 to showing our working. Tensile Strength= field of force=13.43mm x 3.24mm= 37.846 N/mm2?HOW DO WE CALCULATE YIELD STRENGTH?HIPS no.3 from the result table is use as an example. Yield Strength= Area= 13.50mm x 3.33mm= 26.317 N/mm2DiscussionQuestions:1.Does PS possess yielding? What is the Yield strength of HIPS? mainly PS does not exhibit yielding for instances, General Purpose Polystyrene (GPPS) does not exhibit yielding however, High Impact Polystyrene (HIPS) exhibit yielding. The average Yield strength of HIPS is 26.530N/mm22.What is bear in HIPS that is not present in PS that makes HIPS yields? surface (polybutadene) particle is present in HIPS that is not present in PS that makes it yields. 3.Compare the close tensile strength, yield strength and tensile modulus of the foursome ther moplastics.

SpecimenTensile Strength, N/mm2Tensile Modulus, N/mm2Yield Strength, N/mm2GPPS37.8781645.6-HIPS19.3151073.826.530HDPE8.002572.2125.403PP19.279583.1128.553From the table, it shows that among all four specimens, GPPS requires the largest force per building block of measurement area to make it break as it has the highest tensile strength trance HDPE requires the smallest force per unit area to fracture as it has the last tensile strength. In comparison, GPPS has the highest tensile modulus and HDPE has the final among all four specimens. As tensile modulus is the dimension of stress to strain in elastic region, a high tensile modulus means the material is pixilated delinquent to the reason that more stress is required to produ ce a unit of strain. and then GPPS is the most rigid while HDPE is the least rigid among all the four specimens. PP displays the highest yield strength while HDPE with the lowest yield strength. This means that PP has the highest strength of resistance to plastic tortuousness while HDPE has the lowest. GPPS does not have yield strength due the reason that GPPS is brittle and rigid as mention earlier. 4.Briefly expose in less than 100 words the ?Tensile judge?Tensile Test is used widely to measure some of the signalise mechanical properties of plastics used in structural applications. It is the most basic, low-budget and standardised type of mechanical test we can perform on materials. Simply by putting a specimen to the tensile testing machine, we could get the result of how the material will react to the force being applied to it around immediately. ConclusionFrom this experiment, we constitute that different polymer have different tensile strength, tensile modulus and yiel d strength, with GPPS having the highest tensile stre! ngth and tensile modulus, followed by HIPS, PP and HDPE having the lowest. We can fold that polymer with higher tensile modulus usually exhibits low or no yield strength as high tensile modulus material is rigid. GPPS is the strongest as it withstand large amount of load before it break, however, it break almost immediately once the maximum load reaches. While HDPE require less amount load to break it, but exhibits yielding, takes longer time to break yet when the maximum load has reach. With these points, we can conclude that the combination of high tensile strength and high yield strength will leads to material of high toughness. Tensile properties are important for us to meet which material is suitable for a specific application to ensure quality. All in all, tensile test is important, simpleton and relatively inexpensive way to determine tensile properties. compose:1.http://www.asminternational.org/pdf/spotlights/5106_01.pdf2.http://www.ndt-ed.org/EducationResources/Communi tyCollege/Materials/ mechanistic/Tensile.htm If you want to get a full essay, company it on our website: OrderEssay.net

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