• A constitutive material model is developed to nonlinear behaviour of timber. Orthotropic stress–strain relationship used in the linear elastic phase. Under compression a based on Hoffman yield criterion and plastic potential used. Isotropic strain hardening during deformation incorporated into criterion. Tensile damages all three grain directions are established using damage factors fracture ...

The finite-element method is used to perform an accurate numerical study of the normal indentation of an elastic-plastic half-space by a rigid sphere. The effects of elasticity and strain-hardening rate of the half-space are explored, and the role of friction is assessed by analysing the limiting cases of frictionless contact and sticking friction. Indentation maps are constructed with axes of ...

Electron backscatter diffraction (EBSD) has been used to examine the plastic deformation of an ex-service 316 austenitic stainless steel at 297K and 823K at strain rates 3.5x10 -3 s -1 – 4x10 -7 s -1 . The distribution of local misorientations was found to depend on the imposed plastic strain following a lognormal distribution at true strains < 0.1 and a gamma distribution at strains > 0.1. At ...

Single point incremental forming (SPIF) process has proven benefits in terms of formability, flexibility, and low cost as compared to conventional sheet forming, although it some issues such dimensional accuracy quality surface finish for materials. The SPIF is considered a potential method producing customised medical parts craniofacial implants using titanium sheet. This investigation aims an...

Electron backscatter diffraction (EBSD) has been used to examine the plastic deformation of an ex-service 316 austenitic stainless steel at 297K and 823K at strain rates 3.5x10 -3 s -1 – 4x10 -7 s -1 . The distribution of local misorientations was found to depend on the imposed plastic strain following a lognormal distribution at true strains < 0.1 and a gamma distribution at strains > 0.1. At ...

Anisotropy of sand is mainly due to the geometrical arrangement of particles that depends on the orientation of applied load respect to the bedding plane. It is geologically due to micro-fabric created by the arrangement of the particles configured during deposition. Most of the models develop using stress/strain invariants are not capable of identifying this kind of anisotropy. This is mainly ...

This paper presents a new model of equivalent modulus derived from the Repeated Load CBR (RL-CBR) test without strain gauge. This model is an updated version of Araya et al. model (2011), the update consists of using the vertical strain as weighting factor instead of vertical displacement in the mean vertical and horizontal stresses calculation. The accuracy of equivalent modulus was improved b...

The paper presents a simple and efficient method for identifying two-parametric isotropic pressure-independent yield criteria. experimental procedure includes the upsetting of three types specimens. cylinders rings is used to evaluate effect friction. Together with plane strain compression in die, these tests provide two points locus on π-plane. conjunction plasticity theory based Hosford’s cri...

-This study investigates heat generation in metals during plastic deformation. Experiments were designedto measure the partition of plastic work into heat and stored energy during dynamic deformations under adiabatic conditions. A servohydraulic load frame was used to measure mechanical properties at lower strain rates, 10 -3 s -1 to 1 s -1. A Kolsky pressure bar was used to determine mechanica...

This paper deals with analysis and comparison of the equivalent plastic strain temperature fields in aluminium alloy 2024 T3 (AA2024 T3) joint, macro/microstructure appearance hardness profile. In alloys hardened by heat treatment, grain size particle precipitate are functions strain, rate temperature. By analysing it is possible, to some extent, capture effect welding parameters thermo-mechani...