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Crack! Despite the humming and whirring going on inside the machine hall, you can clearly hear the metal sample tearing apart. Even though it looks stable, the metal pin that a student had clamped in the test rig with a few deft moves a couple of minutes earlier has snapped in half. The result of this tensile test, in which a sample is stretched lengthwise at one end, does not come as a surprise to the students. They had already simulated exactly this process on the computer. Now they are testing the computer model that predicted how the sample would behave in practice.