{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

# lab 5 - Analysis of Results Plate penetration 1,2 Maximum...

This preview shows pages 1–4. Sign up to view the full content.

Analysis of Results Plate penetration: 1,2. Maximum energy absorbed versus temperature for plates of PMMA (Blue) and ABS (Pink). Note: graph shows actual data points as well as the probable dependence of energy absorbed as a function of temperature. Maximum load versus temperature for plates of PMMA (Blue) and ABS (Pink). Note: graph shows actual data points as well as the probable dependence of maximum load as a function of temperature.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Charpy impact: 3,4. Maximum energy absorbed versus temperature for Charpy specimens of steel 1045(Blue) and aluminum 6061(Pink). Note: graph shows actual data points as well as the extrapolated probable dependence of energy absorbed as a function of temperature. Fracture toughness: 1. λ = a w fffff , the value of the crack length ( a ) was 26.14mm and the value of the effective specimen length ( w ) was 50.91mm giving a λ value of 0.513 which corresponds to a geometry factor ( f (λ)) of roughly 10. 2. 0 2 4 6 8 10 12 14 16 18 0 0.1 0.2 0.3 0.4 0.5 0.6 Crack-opening displacement (mm) Load (kN) Load-displacement curve for aluminum 7075
Judging from the above graph, the critical load P Q is 15.2kN and the curve is a type II load-displacement curve because the curve slopes down after reaching the critical value and then curves back up to a maximum. 3. Using the equation K Q = P Q B w p w ffffffffffffffffffff f λ ` a a provisional value of K Q can be calculated using a specimen length ( w ) of 50.91mm a specimen thickness ( B ) of 25.54mm a critical load ( P Q ) of 15.2kN and a value of f (λ) of 10. K Q = 26.4MPa*m 1/2 . Using a value of σ y of 500MPa for aluminum 7075 and a value of K Q of 26.4MPa*m 1/2 the following condition must be satisfied in order for K I C to equal K Q : B,a 2.5 K Q σ y

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 5

lab 5 - Analysis of Results Plate penetration 1,2 Maximum...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online