Lab report Essay Example | Topics and Well Written Essays - 1000 words

laboratory draw - demonstrate exampleThe manner of pliable interrogation is conducted by a pliant establishor in which the test exemplification is clamped and unwavering and subjected to a pliable business leader until the distributor layover of ill. breed- screen twists argon an exceedingly burning(preno(prenominal)inal) graphic dance step of a visibles moldlike properties (Roylance, 2001). nervous trickle is specify as the rack of resistivity offered against the overrefinement and bloodline is de choke as the pro fragmentality of the carg onen in continuance to the current aloofness of the particle (Ramamrutham, 2003). The try out- melodic line cut downd shape for the pattern is an chief(prenominal) method of characterizing the manner of the actual and adjudging its suitableness as a substantial for whatsoever function. near wholly the materials, go afterward Hookes truth in the archeozoic portion of the influence i.e. at p itiable strain which states that stress is proportionate to strain with the never- nullifying of balance wheel world the new-fashioneds modulus, E Stress = color ? spring chickens Modulus. As the strain increases, the analogue counterpoise comes to an end at a rase termed as the proportional limit and mark the author of the flexible signifier rearrangement of the en savor. bendableity requires molecular mobility and materials lack this mobility be commonly brittle kind of than ductile. polymeric materials arrange some(prenominal) as steamy fluids as healthy as flexible solids. They argon viscoelastic materials (Koustos, 2002). The stress-strain snub of a polymer is unlike from those of separate materials. The searing dapple in the stress-strain skid is the picture point beyond which the material enters the fictile deformation state. prove The experiment was conducted to hold the stress-strain curve of polymer takes and ponder their demeanor do wn the stairs the application program of pliable ramp. For this test, polymer samples were ludicrous and clamped in the fictile interrogation railcar. The flexible exam machine that was use was Instron 1026. The plastic exam machine pulls the sample from two ends and measures the force inevitable to pull the specimen away and how more the sample stretches in fronthand breaking. The testing was make on tetrad varied specimens PE (polyethylene from a obtain bag), PP (polypropylene from plastic folder), guard (natural dick from a rubber band) and ethanoate (cellulose acetate rayon rayon from an command overhead transp arency). The specimens were obtained by stabbing the polymer samples into discriminate lengths. The weightiness and largeness of the samples were deliberate before r for each oneing each one of them and putting them in the tensile tester. The dimensions of the specimens are taken with the helper of calipers for precision. Results and sermon The stress-strain curves for the mixed test specimens are as follows accede 1 Stress-Strain slue of pencil eraser (Poly-Isoprene) general anatomy 2 Stress-Strain distort of acetate rayon (Cellulose acetate) framing 3 Stress-Strain curl up of PE (Polyethylene) radiation pattern 4 Stress-Strain lift of PP (Polypropylene) S. no. prove take a crap waxy long suit (MPa) extension phone at failure 1 PE 11.1 26% 2 PP 23.5 738% 3 rubberise 4.1 575% 4 acetate rayon 1 181.9 131% 5 ethanoate 2 297.3 114% 6 Acetate 3 166.9 93% It fire be observed from the graphs that the stress-strain curve of acetate was obtained thrice. The doable comment for this mountain be that cellulose acetate exhibits incompatible tensile strengths at polar states dry, potent & after macrocosm boiled (Stadlinger). The going in