Features and verification
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This document is about the law of behavior LETK (keyword COMPORTEMENT of STAT_NON_LINE) and the associated material LETK (command DEFI_MATERIAU).

This behavior is verified by the two test cases:


* SSNV206 - Triaxial test with the LETK model from CIH - [:external:ref:`V6.04.206 <V6.04.206>`]


* WTNV135 - Drained triaxial test with the LETK model from CIH - [:external:ref:`V7.31.135 <V7.31.135>`]