Unified full-range plasticity till fracture of meta steel and structural steels

Gu, Tianyu; Jia, Liang‐Jiu; Chen, Bin; Xia, Min; Guo, Huiling; He, Manchao

doi:10.1016/j.engfracmech.2021.107869

Cited by 32 publications

(5 citation statements)

References 28 publications

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“…The measured values of the Poisson number evolution in Figures 4 and 5 show that the values of the Poisson ratio in the elastic region for steels are about 0.3 and for aluminum alloys are about 0.35. Moreover, these values in the plastic region unified to 0.5 in the computational simulations are only an approximation, which differs from reality [19][20][21]. This approximation gives reliable results for a stress region not exceeding 75% of yield stress.…”

Section: Discussionmentioning

confidence: 80%

Poisson’s Ratio of Selected Metallic Materials in the Elastic–Plastic Region

Chmelko,

Koščo,

Šulko

et al. 2024

Metals

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Poisson’s ratio is one of the fundamental characteristics in the material models that are used. In engineering practice, its values are assumed to be constant in the elastic and in the plastic region. In this paper, the conventionally used values of this number for steel materials and aluminum alloys are confronted with experimental results. By using non-contact strain measurements with the DIC (digital image correlation) method, the evolution of the Poisson ratio value in the regions of transition from the elastic to the plastic region as well as in the regions of large plastic deformations was documented. The obtained experimental results are graphically compared using the proposed strain scaling. The gradient of the Poisson ratio changes in the vicinity of the yield stress is significant, indicating the need for a refinement of the material models in this region. Deviations from the conventionally used value of this number were found in the large plastic deformation region. In conclusion, a possible approach for improving the accuracy of simulations in FEM softwares was formulated.

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Section: Discussionmentioning

confidence: 80%

Poisson’s Ratio of Selected Metallic Materials in the Elastic–Plastic Region

Chmelko,

Koščo,

Šulko

et al. 2024

Metals

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“…The new bolt has no necking during the static tensile process, and has excellent characteristics of uniform large deformation, disappearance of yield platform and high strength. The yield strength range is 600-1050 MPa, the elongation range is 30%-68%, and the negative Poisson's ratio effect of the material itself is realized (Gu et al 2021;Tang et al 2021). The anchorage shear test of 2G-NPR bolt also reflects its excellent characteristics in resisting shear deformation and improving shear strength (He et al 2022;.…”

Section: Introductionmentioning

confidence: 93%

“…The scholars have carried out a lot of research on the calculation method of true stress-true strain after necking (Ling et al 1996;Song et al 2020;Gu et al 2021). In this paper, the weighted average method with simple form and calculation program is used to calculate the true stress-true strain curve data of 2G-NPR bolt after necking.…”

Section: Tensile-shear Fracture Criterion Of 2g-npr Boltmentioning

confidence: 99%

Numerical simulation study on shear resistance of anchorage joints considering tensile–shear fracture criterion of 2G-NPR bolt

Ren,

Tao,

et al. 2023

Int J Coal Sci Technol

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Abstract2G-NPR bolt (the 2nd generation Negative Poisson’s Ratio bolt) is a new type of bolt with high strength, high toughness and no yield platform. It has significant effects on improving the shear strength of jointed rock mass and controlling the stability of surrounding rock. To achieve an accurate simulation of bolted joint shear tests, we have studied a numerical simulation method that takes into account the 2G-NPR bolt's tensile–shear fracture criterion. Firstly, the indoor experimental study on the tensile–shear mechanical properties of 2G-NPR bolt is carried out to explore its mechanical properties under different tensile–shear angles, and the fracture criterion of 2G-NPR bolt considering the tensile–shear angle is established. Then, a three-dimensional numerical simulation method considering the tensile–shear mechanical constitutive and fracture criterion of 2G-NPR bolt, the elastoplastic mechanical behavior of surrounding rock and the damage and deterioration of grouting body is proposed. The feasibility and accuracy of the method are verified by comparing with the indoor shear test results of 2G-NPR bolt anchorage joints. Finally, based on the numerical simulation results, the deformation and stress of the bolt, the distribution of the plastic zone of the rock mass, the stress distribution and the damage of the grouting body are analyzed in detail. The research results can provide a good reference value for the practical engineering application and shear mechanical performance analysis of 2G-NPR bolt.

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“… Typical full stress-strain curves of Fe-SMA and other typical structural steels [ 19 , 20 , 21 , 22 , 23 , 24 ]. …”

Section: Figurementioning

confidence: 99%

Iron-Based Shape Memory Alloys in Construction: Research, Applications and Opportunities

Zhang

et al. 2022

Materials

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As a promising candidate in the construction industry, iron-based shape memory alloy (Fe-SMA) has attracted lots of attention in the engineering and metallography communities because of its foreseeable benefits including corrosion resistance, shape recovery capability, excellent plastic deformability, and outstanding fatigue resistance. Pilot applications have proved the feasibility of Fe-SMA as a highly efficient functional material in the construction sector. This paper provides a review of recent developments in research and design practice related to Fe-SMA. The basic mechanical properties are presented and compared with conventional structural steel, and some necessary explanations are given on the metallographic transformation mechanism. Newly emerged applications, such as Fe-SMA-based prestressing/strengthening techniques and seismic-resistant components/devices, are discussed. It is believed that Fe-SMA offers a wide range of applications in the construction industry but there still remains problems to be addressed and areas to be further explored. Some research needs at material-level, component-level, and system-level are highlighted in this paper. With the systematic information provided, this paper not only benefits professionals and researchers who have been working in this area for a long time and wanting to gain an in-depth understanding of the state-of-the-art, but also helps enlighten a wider audience intending to get acquainted with this exciting topic.

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Unified full-range plasticity till fracture of meta steel and structural steels

Cited by 32 publications

References 28 publications

Poisson’s Ratio of Selected Metallic Materials in the Elastic–Plastic Region

Poisson’s Ratio of Selected Metallic Materials in the Elastic–Plastic Region

Numerical simulation study on shear resistance of anchorage joints considering tensile–shear fracture criterion of 2G-NPR bolt

Iron-Based Shape Memory Alloys in Construction: Research, Applications and Opportunities

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