report on crane
In laboratory 5, "Boom Construction Competition", the concepts of material failure, stress and strain were introduced, as well as booms and the work that they do. The students had been asked to construct a boom. The booms were tested, and competed within the lab. The ideal design was a boom that had a long arm, at least 1.5 meters, and was able to carry objects as heavy as possible. The main principle of a boom is to transport heavy objects from one place to another place. Booms were frequently used in constructions. For example, cranes were very important tools that are used in most construction sites There are two important considerations in the boom design. One is the maximum weight that the boom can lift/move, under the condition that the boom is mobile or stationary. The other one is that the maximum height that the boom can lift through. Based on these two considerations, the material choices are very important. The most effective consideration of material choices is material failure. There are three modes of material failure. This kind of failure usually is caused by the object's environment. When two or more objects react with each other, the original objects will be
The graph clearly shows the relationships between stress and strain of materials. * The construction has to be finished in the allotted time. This kind of failure mostly is caused by temperature changes. When the object is exposed to the big temperature changes, which is from high temperature to low temperature, during a short term of time, the object will be contract. The failure is not uniform that it usually occurs on the weakest part of the material. The available materials were first studied. They were 2 thick dowels, 2 thin dowels, 6 bamboo skewers, tape, and Kevlar string. In this lab, each team is asked to build boom and compete it. With the provided materials, the brainstorm and initial were finished in few minutes. In the sketch, the boom had a long arm and two supporters on the back. There was also a hole in each supporter, in order to connect the boom with the anchor. The bamboo skewers connected the holes and the anchor. After the sketching, the boom was being constructed based on the sketch. Some mistakes and justifications were made during the construction. For example, the dimension had been changed, and the structure had been generalized, due to the limited materials that were available. --------------------------------------
Some common words found in the essay are:
Competition Rules, Construction Competition, Weighted Ratio, Thermal Shock, Breakage Load, Fracture Stress, Plastic Region, Elastic Region, A=cross-sectional Strain, Tensile Stress, applied materials, material failure, stress strain, * boom, weight ratio, loads applied materials, materials materials, boom arm, removed materials, 15 meters, boom strengthened, weight added boom, applied materials materials,
Approximate Word count = 854
Approximate Pages = 3 (250 words per page double spaced)
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