It is one of the most widely available rifles in the world because of its low cost to manufacture, ease and durability.
Specimens were put in the testing tanks of a specially manufactured accelerated marine durability system, where they were exposed to cycles of sea water wetting and hot air drying.
Qualitative improvement will in turn enhance the mechanical performance such as the modulus of elasticity and strength, and it will be possible to manufacture concrete with improved durability in terms of drying shrinkage, neutralization, and freezing-thawing.
In fact, Hugo Schmeisser, who, Chivers writes, designed the first working assault rifle for the Germans, worked as a prisoner of war in the same center where the AK-47 was designed and instructed his captors in the metal-stamping process that has been a key to the Kalashnikov's durability and inexpensive manufacture.
Prototype hybrid valve lifters were manufactured and a series of durability tests were conducted on the laboratory bench.
The main ageing and degradation phenomena, which relate to the reliability and durability of polymers, from manufacture and service, to final disposal or recovery, are reviewed.
Yet limited research seems to have investigated the durability of GFRP bars manufactured with different types of resin.
Analysis of hardness and durability values of cubes manufactured from fractionated sun-cured and dehydrated alfalfa chops was performed to determine predictive equations.
Thus, the surface preparation of steel substrates and their exposure before and during manufacture or repair will strongly influence the strength and durability of the resulting coated steel substrates or adhesive joints comprising steel adherents.
Toyobo has acknowledged that tests show Zylon losing 10percentto20percentcent of its durability within two years of manufacture, but a spokesman, Kent Jarrell, said it worked well in body armor that was properly constructed.
