The project aims to study tensile softening behavior of fiber reinforced concrete .Concrete is very much weak in tension but by addition of randomly oriented short crimped steel fibers will change the behavior from brittle to ductile. In the present work, the steel fibers were added at the volume fraction, being 0%, 0.5%, 1%, 1.5% to the normal strength concrete and high strength concrete. The ...

Strain-induced phase transformation and damage accumulation in austenitic stainless steel subjected to cyclic loading were investigated by nondestructive evaluation. The cyclic loading test was performed at various strain amplitudes at the same strain rate. The volume fraction of the strain-induced phase transformation (α′-martensite) was determined by ferrite scope and magnetic coercivity meas...

There are more and tunnel projects in the karst-developed areas Southwest China. Affected by karst caves water, tunnels often experience geological disasters such as local collapses water inrush. A simplified rock stress hardening-softening model was established based on triaxial compression test results of two kinds carbonatite to accurately analyze deformation inrush characteristics surroundi...

Abstract GH2132 superalloy performances excellent properties, such as the good rupture strength and yield below 923K, fine processing plasticity welding properties. The warm working behavior of at 673 K – 773K is investigated by a thermal simulator in this paper. results show that worm effects center specimen most significant compared with other positions. deformation temperature strain rate ke...

Large-strain monotonic and cyclic loading tests of AZ31B magnesium alloy sheets were performed with a newly developed testing system, at different temperatures, ranging from room temperature to 250 °C. Behaviors showing significant twinning during initial in-plane compression and untwinning in subsequent tension at and slightly above room temperature were recorded. Strong yielding asymmetry and...

Tunnel opening or excavation in the strain-softening rock masses primarily leads to initial stress release and deformation. The increasing plastic shear strain induces a nonlinear variation of dilatancy masses. Therefore, tunnel stability is strongly dependent on state behaviors In view this, this paper proposes an elastoplastic finite difference solution based triple-shear element (TS) unified...

The study systematically compares the low-cycle fatigue (LCF) behaviors of novel martensitic steel (22MnSi2CrMoNi) and maraging (00Ni18Co9Mo4Ti). Results show that two types tested have a similar cyclic deformation behavior. softening resistance 22MnSi2CrMoNi is slightly inferior to 00Ni18Co9Mo4Ti at low total strain amplitude. However, gap gradually disappears with increase At same plastic amp...

The present paper demonstrates that the Hart-Smith constitutive model and the more recent Arruda and Boyce eight chains and Gent constitutive models are closely related. The ability of these three models to predict both small and large strain responses of rubbers is highlighted and equations that relate their material parameters are established. INTRODUCTION Elastomers exhibit a very complex me...