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Mechanical Engineering Chapter 3: Impact Toughness and Design Against Impact Quiz

13 Questions

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Mechanical Engineering Chapter 3: Impact Toughness and Design Against Impact Quiz

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Questions and Answers

What is the purpose of an impact test?

To assess the material's resistance to impact loading (correct)

To calculate the material's thermal conductivity

To determine the density of the specimen

To measure the tensile strength of the material

What does the impact energy value indicate about a material?

Its thermal conductivity

Its tensile strength

Its toughness under test conditions (correct)

Its density

What are the three conditions chosen for impact test to represent potential for fracture?

Low temperature, low strain rate, and uniaxial stress state

High temperature, low strain rate, and uniaxial stress state

Low temperature, high strain rate, and triaxial stress state (correct)

High temperature, high strain rate, and uniaxial stress state

Which standardized tests are used to measure impact toughness?

Izod and Charpy Signup and view all the answers

What shape is the specimen for both Charpy and Izod tests?

Rectangular with a V-notch Signup and view all the answers

At what angle is the V-notch machined into the specimen for Charpy and Izod tests?

45° Signup and view all the answers

What is the primary difference between the Charpy and Izod techniques?

The manner of specimen support Signup and view all the answers

What is the measure of impact energy in the Charpy V-notch (CVN) technique?

$m(h-h̀)$ Signup and view all the answers

What is the significance of ductile-to-brittle transition temperature (DBTT)?

It indicates the range of temperature over which a material experiences a ductile-to-brittle transition Signup and view all the answers

What happens to the impact energy as the temperature is lowered?

It decreases suddenly over a relatively narrow temperature range Signup and view all the answers

How does the nature of fracture mode change as the temperature is lowered?

From ductile to brittle fracture surface Signup and view all the answers

What is used to determine the transition temperature for ductile and brittle fracture?

The appearance of the fracture surface Signup and view all the answers

What is the equation for impact strength ($σ_{impact}$) in the Charpy V-notch (CVN) technique?

$σ_{impact}= E/A$ Signup and view all the answers