Experiment # 11
Title:
To investigate the bending characteristics of a wooden beam using Universal Testing Machine.
Abstract:
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Objective:
To investigate the bending characteristics of a wooden beam using Universal Testing Machine.
Equipment & Material:
Universal Testing Machine, Vernier caliper, Measuring tape.
Universal Testing Machine
Procedure:
1) First turn on the computer & come into operation of software state.
2) Measure length, width and depth of beam.
3) Press “Power On” on the top of control console & start the button “Pump On” at once.
4) Mark the points on the beam showing position of support and point loads.
5) Start oil pump power set.
6) Install upper two point bending plates on the bottom of lower crosshead.
7) Set specimen in the machine according to two points loading.
8) Fill some related specimen information of machine software.
9) Select the mode compression test in machine software.
10) Adjust the test load zero & re-set peak value.
11) Apply load gradually with care.
12) Apply load until the specimen fails.
13) After test stop the machine from software when specimen fails.
14) Plot a graph of load against deflection and find the slop.
Observations and Calculations:
𝑏𝑟𝑒𝑎𝑡ℎ 𝑜𝑓 𝑡ℎ𝑒 𝑤𝑜𝑜𝑑𝑒𝑛 𝑏𝑒𝑎𝑚 = 𝑏 = 𝑚𝑚
ℎ𝑒𝑖𝑔ℎ𝑡 𝑜𝑓 𝑡ℎ𝑒 𝑤𝑜𝑜𝑑𝑒𝑛 𝑏𝑒𝑎𝑚 = ℎ = 𝑚𝑚
𝑐𝑟𝑜𝑠𝑠 𝑠𝑒𝑐𝑡𝑖𝑜𝑛𝑎𝑙 𝑎𝑟𝑒𝑎 𝑜𝑓 𝑡ℎ𝑒 𝑤𝑜𝑜𝑑𝑒𝑛 𝑏𝑒𝑎𝑚 = 𝐴 = 𝑚𝑚2
𝑙𝑒𝑛𝑔𝑡ℎ 𝑜𝑓 𝑡ℎ𝑒 𝑤𝑜𝑜𝑑𝑒𝑛 𝑏𝑒𝑎𝑚 = 𝐿 = 𝑚𝑚
𝑏𝑟𝑒𝑎𝑘𝑖𝑛𝑔 𝑙𝑜𝑎𝑑 = 𝑃 = 𝑁
𝑤𝑜𝑜𝑑𝑒𝑛 𝑏𝑒𝑎𝑚 𝑑𝑒𝑓𝑙𝑒𝑐𝑡𝑖𝑜𝑛 = 𝛿 = 𝑚𝑚
3𝑃𝑎
modulus of rupture = 𝑀. 𝑂. 𝑅 =
𝑏ℎ2
Where; P = Breaking load for modulus of rupture M.O.R
𝟑𝒂𝑳𝟐 𝑷
𝑴𝒐𝒅𝒖𝒍𝒖𝒔 𝒐𝒇 𝑬𝒍𝒂𝒔𝒕𝒊𝒄𝒊𝒕𝒚 = 𝑬 = ×
𝒃𝒉𝟑 𝜹
Where; P = Applied load within elastic limit for E
Analysis:
Obs. 𝑭 𝜹 𝑷 𝝈 𝝐 𝑴. 𝑶. 𝑹 𝑬
(𝑵) (𝒎𝒎) (𝑵) (𝑵⁄𝒎𝟐) (𝑵⁄𝒎𝟐) (𝑵⁄𝒎𝟐)
1
2
3
4
5
Conclusion:
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Question # 1:
Enlist modifications or improvements in this experimental set up.
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