To investigate the thermal deformation behavior of Ti–10V–2Cr–3Al titanium alloy, hot compression experiments were carried out via a strain rate 0.1–0.001 s−1 and temperature 730~880 °C. The results showed that rheological stress decreases when increases or decreases. Due to conditions, some flow curves exhibited significant discontinuous yielding softening. Flow softening in α+β phase region w...

The paper reviews the modeling of damage by the microplane model and presents extensions required for cyclic loading. The general microplane constitutive model is implemented in a three-dimensional finite element code and used in damage and bifurcation analysis of various structures. The results of the analysis are compared with test results and some of the comparisons are shown in the present ...

In this paper, shear localization due to strain softening in sidepressed cylinders, is inverstigated. Shear localization causes formation of macroscopic shear bands which can be obsserved in the metallographic cross-section. In this paper, for the first time a method is presented in which a simple two-slice model is used to study the formation of shear bands. The results obtained form this mode...

Crack propagation modeling in quasi-brittle materials such as concrete is essential for improving the reliability and load-bearing capacity assessment. Crack propagation explains many failure characteristics of concrete structures using the fracture mechanics approach. This approach could better explain the softening behavior of concrete structures. A great effort has been made in developing nu...

The fatigue behavior of a nickel-base superalloy was investigated under total strain-controlled mode at high temperature. The fatigue life, cyclic stress response behavior and hysteresis loop of the superalloy were investigated under isothermal low cycle fatigue (LCF) conditions. The superalloy exhibited cyclic hardening and softening behaviors during the process of fatigue loading. The hystere...

Steel 2205 is one of the most famous duplex stainless steels. The microstructure of this steel composed of ferrite and austenite in similar amount. Therefore, in order to improve mechanical properties through microstructure, thermo mechanical processes such as controlled hot rolling and forging should be applied. It is not possible to employ the usual heat treatment. It shows the importance of ...

energy-based optimized design of polymer fiber-reinforced tunnel lining mohammad safi                   analysis of underwater tunnels considering strain-softening behavior in plastic zone ahmad fahimifar; hamed ghadami; masoud ahmadvand; arvin abdolmaleki                                 the effect of operational parameters on penetration rate of a tbm using artificial neural networks- a case s...

In this paper, a simple sub-loading yield surface model for both normally consolidated and over-consolidated clay is proposed with emphasis on the effect of shape. Compared modified Cam-clay model, only one additional material parameter introduced to reflect geometry features surface. A higher-order stress–dilatancy relation given in current study, leading new function capable offering an adequ...

Abstract This paper presents the failure analysis of layered clayey slopes with emphasis on combined effect clay’s weakening behavior and seismic loading using particle finite element method (PFEM). Diverse mechanisms have been disclosed via PFEM modelling when strain-weakening clay is concerned. In contrast to a single slope exhibiting either shallow or deep mode, may undergo both modes time i...