This paper is concerned with monotonic and load reversal deformation of four dual-phase (DP) 590, 780, 980, 1180 one martensitic (MS) 1700 steel sheets. While the data are presented for all steels, provided DP 1180. Particularities pertaining to including decreasing hardening rate during forward tension, a linear then non-linear unloading, followed by Bauschinger effect, shift in continuous str...

Using the first principles pseudopotential plane-wave method and the full-potential linearized muffin-tin orbital method, we study how the geometry and the electronic structures change along the orthorhombic transition paths of zinc blende ~ZB! to rocksalt ~RS! under high pressure. Two different paths, called the fixed strain ~force-free! path and the fixed position ~hydrostatic stress! path, p...

Abstract: In a typical optic fiber Bragg grating (FBG) strain measurement, unless in an ideal static laboratory environment, the presence of vibration or often disturbance always exists, which often creates spurious multiple peaks in the reflected spectrum, resulting in a non-unique determination of strain value. In this report we attempt to investigate the origin of this phenomenon by physical...

2014 The continuum mechanics framevork for analyzing necking and shear band instabilities is discussed. The predicted onset of instability depends sensitively on the material’s constitutive characterization, not only through properties, such as strain hardening and strain rate sensitivity, that can be measured in proportional loading tests, but also through the material’s response to a change i...

We describe a frequency-modulation technique that is applicable to two-beam interferometric systems illuminated by semiconductor diode lasers. The technique permits a determination of the optical path difference between the two arms of the interferometer and is used here to extend the range of a fiber polarimetric strain sensor by determining the order of the particular polarimetric fringe unde...

Characterization and modeling of path-dependent behaviors complex materials by phenomenological models remains challenging due to difficulties in formulating mathematical expressions internal state variables (ISVs) governing behaviors. Data-driven machine learning models, such as deep neural networks recurrent (RNNs), have become viable alternatives. However, pure black-box data-driven mapping ...

Abstract The mechanical response of dual phase (DP) steel exhibits a complex dependence on the microstructure. chemical composition and microstructure characteristics phases have significant effects contrast between phases, which affects, not only strength ductility, but also anisotropic DP under strain path changes. In this work, extended dislocation-based models ferrite martensite are propose...

background heat is a harmful factor in workplaces that causes physiologic and cognitive changes in workers. objectives the purpose of this study was to investigate the effect of cooling vest on heat strain and reaction time while wearing chemical-biological-nuclear protective clothes. methods twelve male students with mean age of 25 ± 2 and body mass index (bmi) of 23 ± 1.5 were recruited in th...

determination of critical points on hot stress-strain curve of metals is crucial in thermo-mechanical processes design. in this investigation a mathematical modeling is given to illustrate the behavior of metal during hot deformation processes such as hot rolling. the critical strain for the onset of dynamic recrystallization has been obtained as a function of strain at the maximum stress. in a...

advanced high strength steels (ahss) have recently attracted great attention because of their superior mechanical properties. a modern group of these steels, known as twinning induced plasticity (twip) steels, shows a unique combination of strength and ductility even at high rates of strain. in order to examine the functionality of such steels in dynamic loading conditions, their mechanical beh...