Abstract:
The properties and behavior of plastics is still not well defined like metals and
standard data sets for specific service applications are yet to be established.
High Density Polyethylene is a plastic class which is expected to sustain
extreme service conditions. The above mentioned aspect of exploring the
plastics character stimulated the research. Molecular structure of this specified
material was studied. Material processing through injection molding was
examined .To analyze the impact behavior of this material, a series of
experiments were conducted on variety of material samples molded at varying
process melt temperatures and were subjected to impact testing with different
conditioning environment.
Apart from mechanical testing, thermal characteristic analysis and flow
behaviour of various samples was also conducted. To further supplement the
outcome of aforementioned lab test series, a real in service product
manufactured from same material i.e. Butt Plate of Rifle G3 was also
incorporated in this study and different samples were put to Radiographic
examination and dynamic impact testing on a specially fabricated test bench.
This additional dimension provided an opportunity to validate certain lab test
deductions in a real service environment. Butt Plate material model was also
simulated utilizing an injection molding analysis program “Mold Flow MPi3”.
The predicted results generally agree to theoretical and experimental findings.
The results analysis deduced that Material demonstrated comparatively best
impact character in processing temperature range of 230 – 2400
C.Impact
strength of material reduces when processed at 2500
C. Material suitably under
service conditions at low temperatures should be carefully examined.
Manufacturing process parameters of Butt Plate and its design need minor
modifications to get desired working strength.
