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A Numerical stress-strain response Model of All Grades of Concretes under Uniaxial Compression

Journal of Wuhan University of Technology(Materials Science) 2006年第3期21卷 149-152页

作者：王勇威 College of Water Resource & Hydropower Sichuan UniversityChengdu 610065China

An important problem facing stress-strain response modeling of concrete is the complexity of the compressive strength grades. 21 groups of speeimens with different cubic compressive strength （56.3- 164.9 MPa ） hate beets numerically analyzed. Using only the compressive strength, a stress-strain response model of different concrete grade was established. The numerical simulation model not only qualitatively reproduces the relationship of uniaxial compressive strength, peak value stress and cubic compressive strength, but realizes the consistence of the ascending branch of stress-strain cunts with different strength grades by introducing the correction coefficient k. The results indicate k increases gradually from 0 to approximate 1 with the increase of the compressive strength, corresponding to the transition from the paracurve to straight line branch in stress-strain curves. When k is 0, the madel is identical to the Hognestad equation. A good agreement with the experiment data was obtained.

关键词： high-strength concrete stress-strain response mechanical property

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Inter-zone constraint modifies the stress-strain response of the constituent layer in gradient structure

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Science China Materials 2021年第12期64卷 3114-3123页

作者： Yanfei Wang Yuntian Zhu Xiaolei Wu Yueguang Wei Chongxiang Huang School of Aeronautics and Astronautics Sichuan UniversityChengdu 610065China Department of Materials Science and Engineering City University of Hong KongHong KongChina State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of SciencesBeijing 100190China Department of Mechanics and Engineering Science College of EngineeringPeking UniversityBeijing 100871China

How an individual constituent zone behaves during the deformation of a heterostructured metallic material is a fundamental issue for understanding heterostructure deformation, but it remains a challenge to experimentally observe it. Here we report a study on the stress-strain behavior of the nanostructured gradient layer(NGL) in an integrated gradient specimen that consists of a coarse-grained(CG)central layer sandwiched between two NGLs. Constraint from the CG central layer led to the formation of dense and dispersed stable strain bands(SBs) in the NGL, which regained dislocation hardening after initial recovery and grain coarsening. Consequently, the NGL exhibited a transient plateau of flow stress after yielding, and then regained extra strain hardening to achieve excellent uniform elongation. These unique behaviors are dramatically different from those of a freestanding NGL, indicating a fundamentally different deformation principle that is intrinsic to heterostructures, i.e.,inter-zone constraint modifies the constitutive behavior of constituent zones.

关键词： heterogeneous structure nanostructure stress-strain response strain bands strength and ductility

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