points on the stress-strain curve for medium-carbon ste

Which predicts the lower yield strength for most combinations of applied stress––the Tresca or the von Mises yield criterion? Under what stress conditions are the predictions equal?

Describe the behavior of materials under shear stress?

7. Which of the following statements is suitable to describe the mechanical properties of low carbon steels and high carbon steels without cold working treatment? (a) Low carbon steels containing ferrite and pearlite phases generally have lower tensile strength than high carbon steels. (b) Low carbon steels containing cementite and pearlite phases generally have lower hardness than high carbon steels. (c) Low carbon steels containing ferrite and cementite phases generally have higher ductility and higher hardness than high carbon steels. (d) Low carbon steels are generally less stiff than aluminum alloy.

When a statically determinate structure is heated or cooled, its members do not experience any“thermal” stress. But for a statically indeterminate structure, this is not true. Explain why.

Describe the material behavior of Steel

Draw two schematic graphs using pencil showing a typical stress-strain curve for aluminum. The first graph should show engineering stress vs engineering strain, and the second graph should show true stress vs true strain. Label the showing: (i) elastic modulus (ii) proportional limit (iii) yield stress (iv)yield strain (v) fracture stress (vi) fracture strain on each graph. You may showboth graphs on one plot. Explain the difference between engineering stress and true stress.

Specify a copper alloy that requires at least 50% elongation and at least 300 MPa tensile strength.

12. What are is an impact tests. Sketch the impact testing machine setup and explain the basic principle of toughness determination from it. What is DBTT? sketch the impact energy vs temperature curve for plain carbon steel and discuss why do many materials become brittle at low temperatures.

Tag question Consider the graph below for 3 metals which have been cold-worked. From the graphs, which of the following statements are true? Stress Select one or more: a. C. Strain & A e. B C b. B and C have similar hardness; C has greater brittleness B is softer than C and has nearly similar ductility A is harder than C and is more ductile d. A and B have similar hardness; A has greater brittleness A is harder than C and is less ductile f. B is harder than C but has nearly similar ductility 5 up i A C