DIRECT SHEAR TEST ON TIMBER SPECIMEN
Objective
To determine experimentally, the ultimate shear strength in single shear of timber.
Apparatus used:
Universal testing machine, Shear attachments,Vernier calipers.
STEP
1
Take the wood specimen and determine the width & depth of the failure plane using vernier calipers.(w=width, d=depth)
Wood Specimen
STEP
2
The timber (along the grain) is placed in the shear attachment and placed into the Universal Testing machine.
STEP
3
The machine is switched ON & the load is gradually increased until the specimen is fractured and the load required to fracture is recorded.
STEP 4
Calculate the double shear strength of timber specimen.
| Width of the failure plane 'w' (mm) | Thickness of the failure plane 'd'(mm) | Area of cross-section (A=w*d) mm2 | Failure Load P (kg) | Single Shear Strength (P * 9.81)/A (N/mm2) |
|---|---|---|---|---|
STEP 5
Observation and Result.
| Width of the failure plane 'w' (mm) | Thickness of the failure plane 'd'(mm) | Area of cross-section (A=w*d) mm2 | Failure Load P (kg) |
Single Shear Strength (P * 9.81)/A (N/mm2) |
|||
|---|---|---|---|---|---|---|---|
| Width of the failure plane 'w' (mm) | Thickness of the failure plane 'd'(mm) | Area of cross-section (A=w*d) mm2 | Failure Load P (kg) |
Single Shear Strength ((P * 9.81)/A (N/mm2) |
Percentage Error |
||
|---|---|---|---|---|---|---|---|
| Actual Value |
Entered Value |
||||||
Trial =
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