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1) Cutting Test - Pulling
Test medium here was tha Polyporpylen rope with an 8mm (0.315") diameter. Test was, how well the knife will cut through that rope with a pulling cut and normal pressure applied. Several trials were done one after another, the number of cuts needed to finally cut through the rope were noted. At the end of that test an average was calculated. These were compared and points given in analogy to the cutting performance.
2) Cutting Test - Pushing
Test medium was again the 8mm (0.315") Polypropylen rope. Test was, how good the knife would cut through the rope only by pushing down, no longitudinal movement. Here the blade was pressed down hard with both hands. It was measured, how deep the blade could penetrate the rope or how often a rocking/swaying (?) motion ws needed to cut through the rope. At the end of this test, again an average was calculated. These were compared and points given in analogy to the cutting perfomance.
3) Edge Retention Test
To test the staiblity of the edge and the wear while using it, a very nasty material was cut : a steel square tube (ST-37). The edge was pulled over the edge of that square tube several times with light pressure. In between these cuts the edge was tested on the rope to compare how good or bad it could cut. There by it became clear, that the original edge and sharpness was lost very fast, still both knives could cut even after several cuts on the square tube. The Strider S30V blade proved to keep its edge slightly better.
4) Grip - Test
The knife's blade was mounted to a vice, the handle and hand were rubbed with the good and well known Ballistol weapon oil. This was done to simulate the effect of dirt, blood and humidity. Here the secure grip and/or how easily it would slip out of the user's hand was tested. The subjective results were converted into points. Here the Strider proved to have a lot of grip in oily condition (not less than dry), while the Extrema Ratio was very slippery due to the smooth/slick surface.
5) Blade Tip Test
To test the stability of the blade tip and also the whole knife construction while stabbing, both knives were pushed straight through a 2mm (0.079") thick steel plate (ST-37 construction steel). Here a hydraulic press was used. The Strider GB bent noticably to the side, but flexed back into its inital position. At a hydraulic pressure of 85bar the tip broke off - exactly at the point of time where it completely penetrated the steel plate. The Extrema Ratio blade was "not impressed" (?), the locking bent at a pressure of 65bar. The bolt safeguard of the lock was not activated on purpose, to prevent the handle from blowing/breaking appart. With that safety a higher pressure would have been possible and the Fulcrum might have also penetrated the steel plate
6) Lock Test
Both knives were first tested with spine-whacking, to perform a dynamic test to the lock. Here the back of both blades were repeatedly beaten onto a hard surface. Both knives passed the test without difficulties. Then a static test to the lock was performed with a hydraulic press. With a slowly raising pressure across the blade pivot, the maximum load was tested. The Fulcrums bolt/hammer of it's lock failed at a pressure of 70bar, releasing it's blade (without bolt safety/safeguard). With activated bolt safety a higher load would have been possible, until the whole handle would break apart. the liner locking mechanism of the Strider GM kept up until 80bar, untl the liner failed. The extreme load/force/stress did not leave any marks on either knives.
7) Blade Bending Test
Both blades were one after another put onto two pads/bases and put under presssure with the hydraulic press in the middle. The Strider GB blade proved to be of etreme elasticity - in spite of the powdermetallic steel (S30V). Not before a pressure of 83 bar (which resembles a high load in transverse direction), the blade broke into several parts. At that point of testing a bending degree of nearly 30° was reached. The extreme thick blade of the Extreme Ratio Fulcrum II passed that test nearly unimpressed. It kept up until the hydraulics maximum pressure of 85 bar was reached and moved back nearly to it's initial position. A slightly deviation of one to two degree (angular transformation) was left.
8) Bearing Test
To test the bearing and handle construction, both knives were put under vertical load/pressure with the hydraulic press. The knives were positioned in such way, that the handle was on the right, the blade on the left side based onto a block, putting pressure directly onto the bearing. The hydraulic press support point was immediatly behind the pivot. The Strider GB proved its impressive flexibility of its handle, which flexed back into its original state. Here the Ti-liners showed their strenght and flexibility. At a pressure of 80bar the outer ring of the pivot blew off. The Extrema Ratio Fulcrum also withstood 80bar, a permanent deformation of the handles stayed.
[ 本帖最后由 bcf2006 于 2006-3-6 04:51 编辑 ] |
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发表于 2006-3-6 04:39
发表于 2006-3-6 10:53
发表于 2006-3-10 20:18
