Study on mechanical properties and acoustic emission characteristics of metallic materials under the action of combined tension and torsion

Li, Shuncai; Yu, Qin; Pu, Jingjing; Chen, Fei

doi:10.1016/j.engfracmech.2018.08.010

Cited by 5 publications

(3 citation statements)

References 18 publications

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“…Similar tension-torsion tests were also carried out using a slightly different geometry of specimen for different materials in the literature. [21][22][23][24][25] However, one major drawback of these tension-torsion tests is that the experimental results are influenced not only by the machining precision of the intricate specimen but also by the coaxiality of the fixtures in a testing machine. It is not uncommon that the manufacturing techniques and testing machine cannot meet the testing requirement.…”

Section: Introductionmentioning

confidence: 99%

“…Their experimental results clearly show that the variation of the equivalent plastic strain at failure with the stress triaxiality is nonmonotonic, and different failure mechanisms are observed under different levels of stress triaxiality. Similar tension‐torsion tests were also carried out using a slightly different geometry of specimen for different materials in the literature . However, one major drawback of these tension‐torsion tests is that the experimental results are influenced not only by the machining precision of the intricate specimen but also by the coaxiality of the fixtures in a testing machine.…”

Section: Introductionmentioning

confidence: 99%

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Effects of the stress state on plastic deformation and ductile failure: Experiment and numerical simulation using a newly designed tension‐shear specimen

Zhang

Wen

Zhang

et al. 2019

Fatigue Fract Eng Mat Struct

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The stress state is one of the most notable factors that dominates the initiation of ductile fracture. To examine the effects of the stress state on plasticity and ductile failure, a new tension‐shear specimen that can cover a wide range of stress triaxialities was designed. A fracture locus was constructed in the space of ductility and stress triaxiality for two typical steels based on a series of tests. It is observed that the equivalent plastic strain at failure exhibits a nonmonotonic variation with increasing the value of stress triaxiality. A simple damage model based on the ductility exhaustion concept was used to simulate the failure behaviour, and a good agreement is achieved between simulation results and experimental data. It is further shown that consideration of fracture locus covering a wide range of stress triaxialities is a key to an accurate prediction.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of the stress state on plastic deformation and ductile failure: Experiment and numerical simulation using a newly designed tension‐shear specimen

Zhang

Wen

Zhang

et al. 2019

Fatigue Fract Eng Mat Struct

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“…Strength assessment is not possible without an understanding of the fracture processes [20][21][22][23][24][25][26] and their relationship to the material state and residual resource. The statistical approach [27] to the evaluation of acoustic emission signals sometimes gives a false idea of the material state [28,29].…”

Section: Introductionmentioning

confidence: 99%

Nanotechnologies of Strength Control of Materials

Nosov

Grigoriev

Peretyatko

et al. 2021

MSF

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The strength of materials is determined by their atomic molecular structure and the process of decay of atomic molecular bonds, which must be taken into account when optimizing materials strength control technologies. The fracture photomicrograph of metal microdamage of welded joint at various moments of time, a multilevel model of flow of acoustic emission signals of materials are presented. The physical meaning, the scale level of parameters included in the model are revealed. The structure of the mathematical model of the flow of AE signals with components of its informative elements of different scale level by strength characteristics of structural materials and resource of technical objects is shown. The multilevel model of the AE signal flow is hierarchically structured, obtained by generalizing deterministic-statistical variability. It describes the process of randomly recording deterministic accumulated damages in the material both before and after the formation of a crack at the stage of waiting for its next leap. It is shown that the proposed nanotechnology of strength control of materials is reduced to non-destructive determination of parameters of prognostic homogeneous destruction, identification of which is based on multilevel modeling of time dependence of micro-crack formation, formulation of criterion of strength homogeneity, registration of AE parameters related to the model of a specific product, which can be automated processing of registration results and determination of universal strength nanoconstants from already published reference data of fatigue tests of standard material samples.

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