3.4.8 Break Coefficient The Break tool features two methods for identifying a material break: %Drop and Rate. Break testing identifies when the material fractures or ruptures and provides a curve that can be used to identify the maximum stress, strain, load or distance prior to the break event.
3.4.8.1 Break %Drop Coefficient The Drop % algorithm is the more commonly used method for deter- mining a sample break. This method first looks for the maximum stress or load. Once the maximum load is determined, the algorithm next looks for a % drop in load. So, if the maximum load was measured as 100N, and the load dropped to 80N, that is a 20% drop in load. The % Drop method is used in the L2 Plus test setup steps for both tensile and compressive limits. This terminates or completes a test run when the maximum load is measured and the load drops be the speci- fied percent value.
Both forms for break identification may be used in either tensile or compressive directions.
Drop % Break
Rate Change Break
25%
The max marker is used to find the break point at a Drop % = 25.
L2 Plus Break Test Using %Drop method for determining the break load
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