8/11/2019 mechanical properties of wood and steel

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8/11/2019 mechanical properties of wood and steel

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Part 2 Compression test of wood

2.1 Experimental

Wood specimens will be tested in compression, two being parallel to the grain and the other twobeing perpendicular to the grain.

Take pictures of the grain pattern and any defects present.

Identify the failure type

Write down the peak load and explain the difference between two grain patterns

Table 2 Test results for wood in compression

Grain patternHeight(in.)

Width(in.)

Peak-Load(lbs)

Strength(psi)

Failuretype

2.2 Failure types

Fig. 1 Types of failures under compression

Part 3 Compressive test of concrete

3.1 Experimental

One concrete sample will be tested in compression, where the stress-strain curve can be obtainedby the hydraulic system and a motion-capture system.

Observe the development of stress-strain curve.

Explain the difference in machine strain and specimen strain by plotting the two differentstress-strain curves.

Calculate the elastic modulus of concrete in class.