Calculation: For center Loading: MR = 3PL / 2bd? Where: MR- modulus of rupture, psi (MPa) P= maximum load applied as indicated by testing machine, in Ib (N) L= span length, in inches (mm) b= average width of specimen in inches (mm) d= average depth of specimen, at the fracture, in inches (mm) Note: The weight of the beam is not included in the above calculation. Tabulated Data and Result Sample No. L (mm) В (mm) D (mm) P (N) MR (MPa) 1 450 150 150 23000 450 150 150 21000 3 450 150 150 19000
Calculation: For center Loading: MR = 3PL / 2bd? Where: MR- modulus of rupture, psi (MPa) P= maximum load applied as indicated by testing machine, in Ib (N) L= span length, in inches (mm) b= average width of specimen in inches (mm) d= average depth of specimen, at the fracture, in inches (mm) Note: The weight of the beam is not included in the above calculation. Tabulated Data and Result Sample No. L (mm) В (mm) D (mm) P (N) MR (MPa) 1 450 150 150 23000 450 150 150 21000 3 450 150 150 19000
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Procedure:
1. Measure the dimensions of the specimen and the record them in the date sheet
2. Turn the specimen on its side with respect to its position as molded and center in on life support
blocks.
3. Center the loading system in relation to the applied force.
4. Bring the load applying-block in contact with the surface of the specimen at the center and
apply a load between 3 and 6% of the estimated load.
5. Grind cap, or use leather shims on the specimen contact surface to eliminate any gap in excess
of 0.004 inch (0.10 mm). Gaps in excess of 0.15 inch (0.38 mm) shall be eliminated by capping
or grinding.
6. Apply the load on the specimen continuously and without shock. The load shall be applied at
the constant rate to the breaking. Apply the load at such a rate that constantly increases the
extreme fiber stresses between 125 and 175 psi/min. (0.86 and 1.21 MPa/min) when calculated
until rupture occurs.
7. Take three measurements across each dimension (one at each edge and at the center) to the
nearest0.05 in. (1 mm) to determine the average width and depth of the specimen at the point
of fracture. If the fracture occurs at a capped section, include the cap thickness in measurement.

Transcribed Image Text:Calculation:
For center Loading:
MR = 3PL / 2bd?
Where:
MR- modulus of rupture, psi (MPa)
P= maximum load applied as indicated by testing machine, in Ib (N)
L= span length, in inches (mm)
b= average width of specimen in inches (mm)
d= average depth of specimen, at the fracture, in inches (mm)
Note: The weight of the beam is not included in the above calculation.
Tabulated Data and Result
Sample No.
L (mm)
B (mm)
D (mm)
P (N)
MR (MPa)
1
450
150
150
23000
2
450
150
150
21000
3
450
150
150
19000
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