By A. A. Collyer
Is helping the person with no formal education in plastic fabrics in the course of the maze of fabrics choice to his ultimate target. people with a easy wisdom of this quarter will enjoy the more effective features of the advisor
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Additional resources for A Practical Guide to the Selection of High-Temperature Engineering Thermoplastics
It is also doubtful whether the large temperature coefficient of refractive index for plastic materials as compared with glass will cause problems. Although, in military aircraft the materials chosen must show good mechanical and impact behaviour in the range -55 to 200*C for prolonged periods, here the time of flight is small. difference in the refractive index of a similar material from different suppliers would be troublesome. If the optics were to be protected from the outside environment, one could choose the polycarbonate.
5: A flow chart illustrating the 'SIMPOL' program (by courtesy of Ian Barrie) cycle time have been obtained the program calculates the machine specification to handle the process. 3, and a final summary is given. 5. The program uses input details of the mould cavity and a finite element mesh to define p o i n t s in the cavity. The p r e s s u r e s , temperatures, flow directions and velocity, shear rate and shear stress at each point are calculated and the flow pattern in the cavity is derived.
4. review the function of the part - has anything been overlooked? • review the appearance (style, colour, shape and surface finish), • is the design economical for tooling? • are the tolerances realistic? • are the details of the design correct? It can be seen that the polycarbonate is less expensive than the polyacetal although the latter is cheaper per kilogram. The aluminium cost is less than both that of polycarbonate and polyacetal, despite the weight of the aluminium part being about twice that of the thermoplastic parts.