Orthotropic elastic–plastic–damage model of beech wood based on split Hopkinson pressure and tensile bar experiments

• Published in: International journal of impact engineering 2021-11, Vol.157, p.103975, Article 103975
• Main Authors: Šebek, František, Kubík, Petr, Tippner, Jan, Brabec, Martin
• Format: Article
• Language: English
• Subjects: Axial stress; Beech; Continuum damage mechanics; Crack propagation; Damage accumulation; Damage assessment; Dynamics; Elastic stress wave; Finite element method; High strain rate; Impact; Kolsky bar; Pressure bars; Shock
• ISSN: 0734-743X; 1879-3509
• DOI: 10.1016/j.ijimpeng.2021.103975

•Split Hopkinson tensile bar tests are carried out on the European beech wood.•Anisotropic hardwood behaviour is incorporated within continuum damage mechanics.•Failure asymmetry in tension and compression is calibrated towards dynamic tests.•Responses and fracture surfaces from computations are compared to experiments.•Results from digital image correlation are compared to numerical simulations. The hardwood is a natural composite, which finds applications in many fields such as an important building material. Attention was paid to the accurate description of the European beech wood under high strain rates in order to constitute a reliable input for the finite element method. It was done on the basis of split Hopkinson tensile bar tests, taking also into consideration the previously reported pressure bar tests to capture the tensile–compressive failure asymmetry, which was incorporated through the stress triaxiality. Strains measured on the steel bars for specimens oriented in all principal loading directions were used to calibrate the fully orthotropic behaviour of elasticity, plasticity and fracture. The concept of continuum damage mechanics was applied to the damage accumulation in order to simulate the crack propagation within explicit finite elements realistically. [Display omitted]