Multi-surfaced elasto-plastic wood material model in material point method

• Improved advanced elasto-plastic model for wood with multiple yield surfaces. stress integration algorithm and implementation. Large displacements finite strain CPDI simulations of compression tension tests spruce. Wood is a naturally occurring material widely used construction. Due to its natural origin, properties vary behaviour complex. This paper shows an implementation multi-surface constitutive into custom explicit point method code. The chosen one proposed by Schmidt & Kaliske minor modifications ensure better internal consistency. parameters are based on literature data presents two Convected Particle Domain Interpolation Material Point Method experiments, both performed the previously established parameters. first simulation replicates test spruce specimen perpendicular grain direction, carried out at Department Civil Engineering, Aalto University. second experiment from literature, in which knots tensioned until failure. numerical successfully replicate experimental outcomes qualitatively terms deformation load-displacement curves. Simulations three knotted specimens under tension, introduced slight variation different failure patterns similar load, resembling wooden structural elements. Additionally, obtained that well.