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Crashworthiness Simulation of ET2000 Guardrail Extruder Terminal. What is ET2000?. ET2000 is an end treatment for the W-beam guard rails W-beam guard rail, break away wood posts (minimum first 4 of which are secured to foundation tube) and cable anchor system. Objective.
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cable anchor system
Created in HYPERMESH
During an end-on impact, the cable is released as soon as the first post breaks and the impact head separates the anchor box from the W-beam and continues down the rail.
cable anchor, the tensile forces in the guardrail during a downstream
impact would cause a large cantilever bending moment on the weakened
first breakaway post that could cause it to fail.
During a downstream
redirectional impact the tabs interlock with the slots in the anchor
box and provide the needed strength.
The cable anchor transfers this tensile load directly to the steel foundation tubes
through a cable
Pendulum testing of break away posts are available from roadside hardware testing literature where wood posts are supported in rigid test brackets, or the foundation tube, and the break away force required to break away the wood is measured. Also the post nearly always fails in bending
Properties of wood obtained using simulation of these tests are available in literature
The middle portion of wood with hole is modeled with isotropic elastic-plastic material model with failure and fully integrated solid element
Failure occurs if the effective plastic strain reaches failure strain or when the pressure reaches the tensile failure pressure, then the deviatoric stresses are set to zero
The top portion is modeled using an elastic material model with constant stress solid element
The lower portion is modeled using kinematic isotropic elastic-plastic material model
Shell edge-to-edge or beam-to-beam
No master surface. Contact is considered between all parts in the slave list including self contact
The orientation of parts relative each other cannot be predicted in large deformations
SOFT=0 based on elastic constants and element dimension
SOFT=2 based on segment masses and global time step