Tensile stress-strain curve is of high importance in mechanics of materials particularly in numerical simulations of material deformations. The curve is usually obtained by experiment but is limited by necking phenomenon. Engineering stress-strain curve is converted to true stress-strain curve through simple formulas. The conversion, however, is correct up the point of necking. From this point ...

The ground-state deformations of the Ge isotopes are investigated in the framework of GognyHartree-Fock-Bogoliubov (HFB) and Skyrme Hartree-Fock plus pairing in the BCS approximation. Three different Skyrme parametrizations are used to explore the influence of different effective masses and spin-orbit models. There is generally good agreement for binding energies and deformations (total quadrup...

This article aims to compare three plasticity models, namely Bai-Wierzbicki (BW), von Mises and Drucker Prager, predict the failure modes in double-lap metallic bolted joints under shear loading. The joint finite element model has been validated against literature data, which demonstrated application of BW ductile fracture bolt prediction. Taguchi Design is used investigate effects geometrical ...

Elastic and elastic-plastic results are obtained for a semi-infinite slanted through-crack propagating in a symmetrically loaded plate strip with the aim of providing theoretical background to commonly observed plate tearing behavior. Were it is not for the slant of the crack through the thickness of the plate, the problem would be mode I, but due to the slant the local conditions along the cra...

This study analyses the tensile mechanical behaviour and deformation of neck i.e localization initiation, propagation fracture injection-moulded polymer composed high-density polyethylene (HDPE) as a function initial stress triaxiality. Three different specimen geometries namely i) Simple tension, ii) Plane strain iii) Shear specimens were punched from HDPE plates tested experimentally in uniax...

Infallible creep rupture life prediction of high temperature steel needs long hours robust testing over a domain stress and temperature. A substantial amount effort has been made to develop alternative methods reduce the time cost testing. This study presents finite element analysis coupled with ductility based damage model predict under influence multiaxial state ex-service as-received Grade 9...

This study investigates the deformation and fracture mechanisms of two testing methods, tension under cyclic bending (TCB) plus compression (TCBC) their relationship to single point (SPIF) double-sided (DSIF) incremental sheet forming processes. Experimental tests were carried out by using a bespoke TCBC test rig DSIF machine with grade 1 pure Ti samples. The results show elongation-to-fracture...

In this paper, a new approach is proposed for stress state - dependent flow localization in bifurcation failure model bounded through ductile damage in dynamically loaded sheets. Onset of localized necking is considered in phenomenological way for different strain rates to draw the forming limit diagram (FLD). Using a strain metal hardening exponent in the Vertex theory related to the strain ra...