CEEN 3145-Section 101 Construction Materials Lab
Group
Lab Report
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Contents
Abstract.......................................................................................................................................................3
Introduction.................................................................................................................................................3
Procedures..................................................................................................................................................4
Equipment & Apparatuses...........................................................................................................................4
Results.........................................................................................................................................................5
Conclusion...................................................................................................................................................6
References...................................................................................................................................................6
Appendix.....................................................................................................................................................6
Abstract
The goal of bowing test on a wooden bar is to consider the bowing or flexural conduct of the wooden
pillar and to decide the Modulus of Elasticity and Modulus of Rupture of the wood. The modulus of
versatility in bowing and bowing quality is controlled by applying a heap to the focal point of a test piece
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bolstered at two focuses. The modulus of flexibility is determined by utilizing the incline of the direct
area of the heap avoidance bend.
Introduction
Wood is an anisotropic material, typically thought to be an orthotropic material, because of the wood
fiber direction, and because of the manner by which a tree breadth increments in the time of
development. Along these lines, the wood physical and mechanical properties change comparable to
three commonly opposite tomahawks: longitudinal, outspread and extraneous hub. Longitudinal hub is
the hub corresponding to fiber, spiral hub is opposite to the fiber course and typical to the development
rings and the distracting hub is opposite to the fiber course and digression to the development rings.
The twisting quality of each test piece is determined by deciding the proportion of the bowing minute
M, at the greatest burden F max, to the snapshot of its full cross-area. For a basically upheld pillar with
focal stacking, avoidance under the heap is given by:
W =Applied load
L = Effective span of the beam
E = Young’s Modulus of wood
Procedures
Bending Test of Wood
Addition the bowing gadget in the UTM.
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Measure the width and profundity of the wooden bar.
Change the help for the necessary separation and clasp to the lower table.
Fix the transverse test dish at the lower side of the lower cross head.
Fix it on the rollers of the transverse test sections to such an extent that the heap comes at the
inside and measure the length of the range of the bar between the backings for focal stacking.
Change the heap pointer to zero by lifting the lower table. While applying the heap, the
redirection comparing to each heap is discovered from the vernier scale on the UTM.
Note down the most extreme diversion and the greatest burden.
Apply the heaps step by step with the goal that we can peruse the avoidance against each
perusing without any problem.
Expel the measures before the disappointment load; else, they may get harmed.
Avoid the machine when the heap is being applied as the particles may cause a physical issue.
Equipment & Apparatuses
Measuring Tape
Deflection Gauges
Wooden Beam
10 ton Buck ton UTM
Results
b= 18in, h= 1.5in, l=1.5in
Load(l Deflecion(i
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b) n)
0 0
577 0.039
783 0.067
1090 0.0138
1472 0.177
1533 0.24
1595 0.327
1677 0.374
1738 0.398
1780 0.433
1882 0.5
1923 0.535
1985 0.583
1903 0.591
1882 0.614
1554 0.638
1595 0.669
1615 0.681
783 0.697
‘
0.8
0.7
0.6
0.5
0.4
Deflection (in) 0.3
0.2
0.1
0
0 0 0 0 0 0 0 0 0 0 0
20 40 60 80 10 0 12 0 14 0 16 0 18 0 20 0
Load (lb)
Conclusion
The bending behavior of wood is not same as that of steel or concrete block it shows a different
behavior that is odd and it is not following a pattern.
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References
http://classes.mst.edu/ide120/lessons/wood/failure/index.html
Dowling, N.E., Mechanical behavior of materials: Engineering methods for deformation, fracture
and fatigue, 2nd edition, 1999, Prentice Hall, ISBN-0-13-010989-4.Hibbleler, R.C., Mechanics of
materials, SI second edition, 2005, Prentice Hall, and ISBN 0-13-186-638-9.
Appendix
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