Tensile Test Quiz

What is the original diameter of the test piece used in the first tensile test?

• 5 mm

• 10 mm

• 20 mm

• 15 mm

What is the purpose of the distance marks on the test piece?

• To determine the original length

• To visualize and measure the plastic behavior

• To measure the force applied

• To identify the material type

What happens to the test piece when it is unloaded from the elastic area?

• It shows permanent elongation

• It becomes thicker

• It fractures

• It springs back to its original length

What is the Ludas effect?

• A decrease in elongation

• A rapid increase in force

• A constant force level with slight fluctuations

• A sudden drop in force

How is the upper yield strength (Re) calculated?

• By dividing the force at the lower yield point by the original cross-sectional area

• By dividing the force at fracture by the original cross-sectional area

• By dividing the force at the upper yield point by the original cross-sectional area

• By dividing the maximum force by the original cross-sectional area

What is the shape of the test piece during uniform strain?

• It becomes a cone

• It remains cylindrical

• It becomes a rectangle

• It becomes a square

What material is used in the second tensile test?

• Precipitation-strengthened aluminum alloy

• Stainless steel

• Plain carbon steel

• Copper alloy

How is the 0.2% proof strength (Rp0.2) calculated?

• By dividing the maximum force by the original cross-sectional area

• By dividing the force at 0.2% elongation by the original cross-sectional area

• By dividing the force at the upper yield point by the original cross-sectional area

• By dividing the force at fracture by the original cross-sectional area

What is the significance of the 0.2% proof strength?

• It indicates the maximum force the material can withstand

• It shows the stress that causes 0.2% plastic deformation

• It measures the elastic limit of the material

• It determines the fracture point of the material

What is the percentage elongation after fracture in the first test?

• 30%

• 10%

• 40%

• 20%