What is tdefined as brittle yielding?
If the failure occurs before the ductile yielding.
What induces the ductile brittle transition?
Temperature or strain rate transitions
How is the speed of the falling weights in impact testing calculated?
By the conversion of potential into kinetic energy:
What are the testing configurations of impact testing?
Charpy impact testing
Izod impact testing
Normal impact testing
Tensile impact testing
What is measured in the charpy impact test?
The change in energy by fracturing the spezimen with a falling hammer. The measured quantity is the angle or the height after impact.
What is the formula calculating the impact strength in the Charpy test?
delta U is the change in potential energy
How is the change in potential energy calculated?
Lable the components
Hoe does the probe deviate from a cuboid in the Charpy test?
It is notched.
What is the differenz between the Charpy and Izod impact test?
The Izod impact nose has a different shape.
The clamping force is a possible factor.
What is the shape of the notch in Charpy testing?
U- or V-notch
Three different notch radius (in mm):
0.25 V-Shape
0.1 V-Shape
1 U-Shape
How does the change in energy depend on the clamping force in Izod impact tests?
linearly
How is the force applied in tensile impact tests?
What is the built up of the normal impact test?
How is the fracture energy determined in the normal impact test?
Statistically:
Why are forces during impact measured?
to determine if a ductile or brittle failure is present.
How can the force at impact be determined for a charpy impact test?
By applying a strain gauge to the hammer.
Where is a strain gauge applied in tensile impact testing?
Where is a strain gauge applied in normal impact testing?
To obtain information about which time dependencies are strain gauges applied in tensile impact testing?
deceleration
velocity
displacement
energy
How is deceleration obtained form the F(t) distribution in impact testing?
How is velocity obtained form the F(t) distribution in impact testing?
How is displacement obtained form the F(t) distribution in impact testing?
How is the change in energy obtained form the F(t) distribution in impact testing?
Describe the behaviour of Force, Energy and velocity over the length of the impact.
What is the reason for the inertial peak in impact testing?
The part is accelerated at impact and the tension drops afterwards shortly.
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