1. MEMB123 MECHANICS STATICS SLIDES
PRESENTATION
By:
ALIF HANIFA BIN CHE HASSAN (GL)
ADIBAH BINTI HANUSI
AHMAD ZUHAILI BIN ZAINAL BASRI
ALBOGAMY, KHALED NAWAR M
ARIF AZRAEI BIN SAHABUDIN
CRISTINE HURING ANAK PATRICK KENNEDY
DANIA QISYTEENA BINTI SALAHUDDIN
HAFIZAH HANUN BINTI ABU BAKAR
3. CRITERIA
In this project, we designed, built, and tested a model bridge with the measurements as
stated below:
69cm
49.2cm
Actual measurements for our design
4. PROTOTYPE DESIGN AND TESTING
DIMENSIONS
We’ve been told that the bridge should not be longer than 70cm. The width
of the bridge should be at least 5cm but not more than 10cm. The height of
the bridge should not be exceeds 20cm above or 5 cm below “ground
level”. The bridge also must span a distance of 50 cm. So, we had to think of
how we’re going to use the sticks and getting some useful information about
them.
•1 stick = 150mm
•After calculating, we knew that we will need about 187 sticks for the base
while total length of the bridge= 69cm
5. ANALYSIS/ SYNTHESIS/ CONCEPTUALIZATION
We were making 2 tests to perform the bridge component strength.
Test 1 - Tension Test
Objective
The objective of the tension test is to
determine a recommended overlap distance for
two tongue depressors in tension (taking into
account strength and total span length).
Procedure
1. The test specimens were built by gluing two
tongue depressors together using different
lengths of overlap ( max. < 3/4"). We made
sure to test at least 3 specimens for a given
overlap distance to ensure more accurate
results. The hole was reinforced with extra
pieces of tongue depressor.
2. The sticks were placed in the vice on the
testing platform and the hole was reinforced at
the other end with tape.
6. Test 2 - Compression Test
Objective
The objective for Test 2 is to determine a
maximum length that designers should not
exceed, to ensure adequate strength from
compressions members.
Procedure
1. A ruler is used to prepare several specimens
for the compression test ranging in length from
3” to about 10”. For members greater than 6”,
two tongue depressors were glued together
with a 1” overlap length and then the ends was
cutting to the desired length. At least 2 samples
for each length are prepared to ensure some
level of accuracy.
2. To test the specimens, we were placed them
upright on the scale and pushed down as shown
in Figure 2 (using pliers may be easier on our
hands).
10. CONSTRUCTION METHOD
1. Firstly, we decided on the design and laid it out on paper.
2. Then, the sticks were measured and marked so they could be drilled for
the pin joints.
3. Next, we constructed the floor for the length of the bridge, or the struts
we will apply the sides to.
4. After that, we measured the length of the floor or struts. It is likely the
bridge has to span a specified length.
5. Finally, we attached each poles with ropes to the struts.
6. Then, we constructed a number of identical poles by tied them with tiny
rope we are going to join to the struts or floor.
11. TESTING PROCEDURE
The bridge has been tested to failure using the testing apparatus in the
picture since it must hold a minimum weight of 5 kg or 50 N.
Efficiency ratio = test load/weight of model
= 5 KG / 7.65 KG= 6.536
13. CONCLUSION
At the end, we have accomplished the
required task. We had a lot of fun, challenge,
tire , and memorable experience that we have
gained. The bridge task teaches us the values of
determination, perseverance, creativity, logic
thinking, time management, cost effectiveness,
initiatives, and all this values can lead us
towards success when we are working in group.
Although we were facing a lot of difficulties in
decision making and getting ideas but our
cooperated team members were very patient
and managed to solve the problems that we had
during the construction. We started our project
early so that we have time to modify and
troubleshoot the problems. Flexibility, creativity
and perseverance are our motto.
