Question

please in a clear answer find me those and using the table for (polyethlene):

the yield stress

the ultimate tensile stress(uts)

breaking strain

Dimension of Polymer Samples Sample Name Polyethylene Polypropylene Epoxy Rubber Width(mm) 12 12 12 4 Thickness (mm) 3 3 5 2 Gauge length (mm) 42 42 42 14 w

Answer 1

This is a very nice questions. The answers will be approximate, due to constraints with the graph. I have solved the question with diagrams for all three questions.

Load (N) Polyethylene (thermoplastic) 1000 300 •Yeild Point 825N 800 700 500 100 Line Paralled to stress Strain Cerore. 100 Proof strain 00 10 30 40 70 100 110 Machine Extension (mm) 0°096 mm is not clearly Calculating feild Stress: As yeuld point is not indicated in the method of Proof strain to determine yould stress, use the Graph, me well Proof strain = 0.2 % strain. 60916mm 2 0:2 X 48 100 AL (Gange length = 48 mm A2 = change in length due to load We will draw a line from 0:27. Shain. parallel to stress strain carne, the where the line meets the come yeild pornt. point is the

From Graph, 825N. at S point, Load geild Yeild Stress 825 N - :. 12 X 3 mm² load Gooss-sectional Area width=12 Thickum 3) = 3 => Yeeld Strees - 22.92 N mm Am Eap File C/Users/alkha/Downloads/Experiment%201.pdf Load (N) Polyethylene (thermoplastic) 1000 UTS 940 300 800 700 500 100 00 10 TO 100 110 Machine Extension (mm)

Ultimate Tensile stress = Manimum Stras (Peak Pome) Ultimate Tensile Shress 940N 12x 3 mm2 26:11 N/mm2 UTS = 26:11 Ymm? Am File I C/Users/alkha/Downloads/Experiment%201.pdf Load (N) Polyethylene (thermoplastic) 1000 900 800 700 breaking Breaking Point 200 100 TO 110 Machine Extension (mm) 102 After Besting, there will be no more strain at breaking Shain Change in length Original length ܒ Breaking Breaking . 102 42 2:43. Stain = 2:43 | AM

Hope the solution is clear to you and it helps your understanding. ??. Best wishes.