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Q. What do you mean by Thermosetting plastics?
This plastic undergoes a number of chemical changes on heating and cure to infusible and practically insoluble articles. The chemical change is not reversible thermosetting plastics do not soften on reheating and can not be reworked. They rather become harder due to completion of any left-over polymerization reaction. Eventually, at high temperatures, the useful properties of the plastic get destroyed. This is called degradation. The commonest thermosetting plastics are: alkyds, epoxides, polyesters, phenolics and urea.
Types of Registration Provisional Registration Certificate ( PRC ) This is given for the pre-operative period and enables the units to obtain the term loans and worki
Material S48C thickness 4mm pierce hole daimeter 4 mm can do or not? please advise
Fatigue crack propagation: If it is assumed that no plastic deformation occurs around crack tip and law of fatigue crack propagation for place of above Example is da/dN = 10
Spot and projection welding machines On the basis of the mechanical construction, resistance spot welding machines can be of four types viz. rocker arm, press, portable and mul
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Q. Alloy materials control? All low alloy and high alloy equipment components including fittings, flanges and sections of pipe and all welds shall be individually tested by Ven
Find out power transmitted by belt: A belt is running over pulley of 1.5m diameters at 250RPM. The angle of contact is 120º and coefficient of friction is 0.30. If maximum te
Q. What is Crest gauges explain? In case of bridges, it is sometimes necessary to observe high flood levels rather than daily gauges to ensure that minimum clearance is not enc
Various applications of numerical methods in the field of m=numerical engineering.
Calculate plastic zone: Calculate plastic zone ahead of crack in above problem if σY = 250 MPa. Solution From Eq. Here KI is taken as KI max since the plastic
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