Evaluation of the test temperature effect on failure mechanisms and notched impact strength characteristics of ultra-hard low alloy steels

Binar, Tomáš; Kadlec, Jaromír; Rejzek, Martin; Vlkovský, Martin; Hruby, Vojtech

doi:10.1007/s11223-011-9325-6

Cited by 8 publications

(5 citation statements)

References 6 publications

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“…A requirement for a limited crack tip plastic zone, a requirement for plane deformation state and a requirement for very limited stable propagation. Performance conditions and the dynamic fracture toughness evaluation method are defined in detail in works by (3,4,5). Dynamic fracture toughness test results are stated in Tab.…”

Section: Experimental Programmementioning

confidence: 99%

“…A whole range of both external and internal factors contributes to causes of brittle fracture occurrence mechanism, which results in this degradation process. Contemporary evaluation methods of brittle failure risk are based on the approaches of fracture mechanics, which, among others, allow determining a critical defect value for machine component function conditions (3,4,5,6 ). In the paper, temperature effects on critical crack length (l KR ) values for the initiation of unstable propagation at yield strength level stress are evaluated.…”

Section: Introductionmentioning

confidence: 99%

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Critical Crack Length for the Initiation of Unstable Propagation in Relation to Fracture Toughness and the Evaluation of Stress and Deformation Characteristics Obtained From Tensile Testing

Binar¹,

Dvořák²,

Kadlec³

et al. 2014

ECS Trans.

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The paper is concerned with the relation between temperature and critical crack length for the initiation of a brittle crack unstable propagation at the yield strength level stress. For the purpose of calculation, results of dynamic fracture toughness test were applied; the experiment was supplemented with measuring stress and deformation characteristics in a determined test temperature range. For comprehensive assessment of test temperature effects, a fractographic analysis of fracture surfaces was conducted.

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Section: Experimental Programmementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Critical Crack Length for the Initiation of Unstable Propagation in Relation to Fracture Toughness and the Evaluation of Stress and Deformation Characteristics Obtained From Tensile Testing

Binar¹,

Dvořák²,

Kadlec³

et al. 2014

ECS Trans.

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show abstract

“…There are a number of factors which influence the failure mechanism of materials from which the combustion engine cylinder insert, in which the piston moves, is made. One of the significant factors that can cause degradation processes in the material due to external stress is the ambient temperature or temperature generated during the engine operation [1,2]. Determining the critical temperatures that initiate a failure mechanism in the material allows us to determine, for instance, the optimal operating temperature of the engine.…”

Section: Introductionmentioning

confidence: 99%

Failure mechanism in the pearlite structure with lamellar graphite due to temperature

Zimáková

Binar

Šafl

et al. 2022

J. Phys.: Conf. Ser.

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Critical operating temperature can be determined for the machine components that form the key functional part of the device. This article describes a change of the failure mechanism in the material of an engine, where the material structure consists of fine pearlite layers with lamellar graphite equivalent to grey cast iron. The mechanical properties of this material influence not only the layers formed by the perlite, but also the lamellar graphite acting as a stress concentrator. To assess the failure mechanism in the material, a fractographic analysis of the fracture areas was performed after the impact test. The range of test temperatures at which the impact test was performed on the test specimens with notch ranged from -80°C to +180°C. The occurrence of brittle fracture was detected at the low temperatures by cleavage along and over the planar layers of the lamellar graphite. The brittle fracture initiation at the higher temperatures was observed by cleavage in the basic layer of the perlite. Depending on the failure mechanism of the test specimens fracture area, critical temperatures were determined, in which the measured value of the notch toughness decreased. Regression of temperature dependence of notch toughness allows very precise quantification of this decrease.

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“…It is especially noticeable while operating at higher temperatures. (5) (6) This could be solved by doping by the material with other elements and Cr seems to be a good possibility. Chromium is added to this material to form LiCr 0.1 Ni 0.4 Mn 1.5 O 4 modification to reach higher stability.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Annealing Temperature to the Properties of LiNi_0.5Mn_1.5O₄ High Voltage Spinel Cathode for Li-Ion Batteries

Kazda¹,

Vondrák²,

Sedlařı́ková³

et al. 2016

ECS Trans.

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High voltage cathode materials are one of the most promising ways for the next generation of cathode materials for the lithium-ion batteries. Thanks to their high potential and capacity comparable with standard cathode materials as LiCoO2 or LiFePO4, they can reach much higher gravimetric energy density. As for any other cathode material, good crystallinity after synthesis is also very important for high voltage materials to reach a good electrochemical performance during cycling. This paper deals with the influence of annealing temperature on electrochemical properties of high voltage spinel cathode LiNi0.5Mn1.5O4. It was studied at three different temperatures of the synthesis in terms of electrochemistry and structure by SEM and in term of electrochemistry by cycling at different C-rate.

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Evaluation of the test temperature effect on failure mechanisms and notched impact strength characteristics of ultra-hard low alloy steels

Cited by 8 publications

References 6 publications

Critical Crack Length for the Initiation of Unstable Propagation in Relation to Fracture Toughness and the Evaluation of Stress and Deformation Characteristics Obtained From Tensile Testing

Critical Crack Length for the Initiation of Unstable Propagation in Relation to Fracture Toughness and the Evaluation of Stress and Deformation Characteristics Obtained From Tensile Testing

Failure mechanism in the pearlite structure with lamellar graphite due to temperature

Influence of the Annealing Temperature to the Properties of LiNi_0.5Mn_1.5O₄ High Voltage Spinel Cathode for Li-Ion Batteries

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Evaluation of the test temperature effect on failure mechanisms and notched impact strength characteristics of ultra-hard low alloy steels

Cited by 8 publications

References 6 publications

Critical Crack Length for the Initiation of Unstable Propagation in Relation to Fracture Toughness and the Evaluation of Stress and Deformation Characteristics Obtained From Tensile Testing

Critical Crack Length for the Initiation of Unstable Propagation in Relation to Fracture Toughness and the Evaluation of Stress and Deformation Characteristics Obtained From Tensile Testing

Failure mechanism in the pearlite structure with lamellar graphite due to temperature

Influence of the Annealing Temperature to the Properties of LiNi0.5Mn1.5O4 High Voltage Spinel Cathode for Li-Ion Batteries

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Product

Resources

About

Influence of the Annealing Temperature to the Properties of LiNi_0.5Mn_1.5O₄ High Voltage Spinel Cathode for Li-Ion Batteries