Research and Reliability Testing Update:
This month we have performed some materials testing using our Instron Axial, Tension, and Compression Fatigue Test System and our Satec Axial, Tension, Torsion, and Compression Fatigue Test System. The test subjects were a series of different size padlocks constructed from different material compounds; all were heat hardened boron alloys. The project goal was to determine the amount of force required to cut the shackles on these padlocks. The ASTM Standard ASTM F883-09 was used as a guide and starting point for the Design of Experiment. The outcome analysis for this test was to determine mathematically the force required on a set of lock cutters to cut the locks.
Using the ASTM F883-09 Standard it was determined that a 3-Point Bending Test would produce the maximum for load, at the center load introduction. As you will see in the following pictures we constructed our test fixtures using tungsten carbide chisels. The tungsten carbide has a hardness value of 9 on the Mohs.
The Instron 8801 has the ability to supply 100 kN / 22,500 lbf of force to an object. For this test we constructed a test fixture that would hold a carbide tip chisel in each of the grips to act as the cutting head.
For some of the lock shackles, we had to use the Satec Fatigue system, which required a different fixture configuration.
While in compression mode we were able to use the load cell measurement on the Intron and the Satec to plot the force applied to the lock shackle. We imported the data collected from the Instron and Satec into Microsoft Excel for report generation. This is an example of the type of data we can present from this type of testing.