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Classification
Two categories of plastics are identified. Those are: thermosetting plastics and thermoplastics. Plastics generally cannot stand higher temperatures. They become lose and soft their shapes on higher temperatures. Thermoplastics become raising soft or their capability to deform plastically raises as the temperature rises. They can be specified any shape by moulding any number of times. Conversely thermosetting plastics do not soften at higher temperature but may eventually burn or disintegrate and lose their shape. Hence thermosetting plastics can be moulded merely once. Both the plastics can be cut or machined.
Structure of both plastics being polymeric; have of long chain molecules that are tangled as illustrated in following figure. Thermoplastics either carry extremely week cross linking bonds or no cross linkages among chains. Alternatively thermosetting plastics carry strong cross linking bonds and several unfinished polymeric reaction. At higher temperatures such unfinished polymeric reactions are finished and cross linking assists in distortion quite than melting.
Figure: Two Types of Plastics
Prepare a design of close coiled helical compression spring for a service load ranging from 2250 N to 2750 N. The axial deflection of the spring for the load range is 6 mm. Conside
(a) Following consideration were recorder during a test on a single cylinder oil engine : Bore = 300 mm; speed =300 r.p.r.; stroke = 450 mm; net break load = 1.5KN;
whats the example of opportunity cost?
Applications of seam welding Lap seam welding is used for the manufacture of cans, buckets and water tanks and for welding thin walled large diameter pipes. Mash seam welding
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Adhesives Adhesives are a substance able of holding materials together. A joint is formed among two solids is called adherends with a thin layer of adhesive among them. Mainly
Q. Explain about Postweld Heat Treatment? Pressure vessels shall be postweld heat treated per applicable sections, in accordance with applicable material specifications or when
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