The following eneingeering stress-strain data were obtained at the beginning of a tensile test for 0.2% C plain-carbon steel.
a. Plot the engineering stress-strain curve for these data.
b. Determine the 0.2 percent offset yield stress for this steel.
c. Determine the tensile elastic modulus of this steel.

Engr Stress(ksi) Engr Strain (in/in)
0 0
15 0.0005
30 0.01
40 0.0015
50 0.002
60 0.0035
66 0.004
70 0.006
72 0.008

Ifa component is made of two or more materials with different modulus of elasticity (e), it is called a composite member and we calculate the factor·n". mention the formula for calculating n". also, ifn> 1, explain what will happen to the 1. transformed.gi) ifn 1, what will happen to the material when transformed material when

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Air inially occupying a volume of 1 m2 at 100 kpa, 27 c undergoes three internally reversible processes in series. process 1-2 compression to 500 kpa during which pv constant process 2-3 adiabatic expanslon to 100 kpa process 3-1: constant-pressure expansion to 100 kpa (a) calculate the change of entropy for each of the three processes. (b) calculate the heat and work involved in each process. (c) is this cycle a power cycle or refrigeration cycle?