7.3 Truncated Maximum Strain

\includegraphics[width=\textwidth ]{./Images/Truncated.png}

The Truncated Maximum Strain (TMS) is very different from the other failure criteria. You need to read about it to understand it. It has 2 modalities: with and without matrix cut off. Matrix cutoff is used when the strain to failure of the matrix is less than that of the fiber. This is the case for most polymers reinforced with Glass fibers.

Without matrix cutoff, TMS calculates only Fiber Failure, which is equivalent to LPF. The matrix cutoff calculates Matrix Failure, which is equivalent to FPF.

The example shown in the figure uses Glass fiber, so we select the radio button With Matrix Cutoff. The values FPF=120.7 and LPF=259.2 are similar but not identical to those obtained with Max. Stress. Like we said, different failure criteria yield different values.

For an explanation of the other fields in the figure, please see Intact Strength and Degraded Strength. There is no damage factor for TMS.