Calibration of a new local approach to cleavage fracture of ferritic steels

Qian, Guian; Lei, Weidong; Niffenegger, Markus

doi:10.1016/j.msea.2017.03.111

Cited by 10 publications

(21 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure shows the calibration results at 77 K. For FC specimens, m = 25.6, σ 0 = 228.3 MPa ; for CC specimens, m = 11, σ 0 = 161.1 MPa .The new model Equation assumes temperature independence of model parameters, so we did not calibrate Equation at 143 K but will justify this in the following. As discussed in detail in Qian et al, according to the definition of the new Weibull stress σ W in Equation , if the 2 model parameters (m and σ 0 ) are indeed intrinsic material properties independent of temperature, for a given material and a fixed specimen geometry, σ W is a function of the fracture load P f at a fixed temperature (T):

σ_{W} ((), T) = F ((), P_{f} ((), T)) .

…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, this path is not practically desirable. An alternative and cost‐effective approach to determine the values of σ 1, 0 in different volume elements has been thus developed in Qian et al In essence, it adopts an elastic‐perfectly plastic material model for FEA to determine the value of σ 1, 0 in each volume element. The resultant value of stress σ 1 in a plastically deformed volume element is stored as σ 1, 0 for that particular volume element.…”

Section: Experimental Data and Methods Of Calibrationmentioning

confidence: 99%

“…Next, substituting the values of the instant stress σ 1 and the threshold stress σ 1, 0 for exactly the same volume element one by one into Equation to calculate σ W at each load as input to Equation . Then, the same conventional calibration procedure for Equation in Qian et al is applied to obtain the values of m and σ 0 . The proposed approach to determining the values of σ 1, 0 in different volume elements according to an elastic‐perfectly plastic material model significantly reduces the amount of numerical calculation.…”

Section: Experimental Data and Methods Of Calibrationmentioning

confidence: 99%

“…They are either circumferentially notched cylindrical bars for tension or side notched prismatic bars for bending. 5,18,19 Cleavage fracture is a physical process. The mechanisms and intrinsic material parameters for cleavage fracture should be independent of specimen geometries.…”

Section: Model Assumption #4mentioning

confidence: 99%

See 3 more Smart Citations

Statistical assessment of notch toughness against cleavage fracture of ferritic steels

Qian

Lei

Liu³

et al. 2017

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

The work is an initial effort on adopting a statistical approach to correlate the fracture behavior between a notched and a fracture mechanics specimen. The random nature of cleavage fracture process determines that both the microscopic fracture stress and the macroscopic properties including fracture load, fracture toughness, and the ductile to brittle transition temperature are all stochastic parameters. This understanding leads to the proposal of statistical assessment of cleavage induced notch brittleness of ferritic steels according to a recently proposed local approach model of cleavage fracture. The temperature independence of the 2 Weibull parameters in the new model induces a master curve to correlate the fracture load at different temperatures. A normalized stress combining the 2 Weibull parameters and the yield stress is proposed as the deterministic index to measure notch toughness. This proposed index is applied to compare the notch toughness of a ferritic steel with 2 different microstructures.

show abstract

σ_{W} ((), T) = F ((), P_{f} ((), T)) .

…”

Section: Resultsmentioning

confidence: 99%

Section: Experimental Data and Methods Of Calibrationmentioning

confidence: 99%

Section: Experimental Data and Methods Of Calibrationmentioning

confidence: 99%

Section: Model Assumption #4mentioning

confidence: 99%

See 2 more Smart Citations

Statistical assessment of notch toughness against cleavage fracture of ferritic steels

Qian

Lei

Liu³

et al. 2017

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…Therefore, this path is not practically desirable. An alternative and cost-effective approach to determine the values of 1,0 in different volume elements has been thus developed in [19]. In essence, it adopts an elasticperfectly plastic material model for FEA to determine the value of 1,0 in each volume element.…”

Section: Methods Of Calibrationmentioning

confidence: 99%

A new local approach model for cleavage fracture in ferritic steels and its validation

2018

Self Cite

View full text Add to dashboard Cite

Abstract. The paper discusses and applies a statistical approach to correlate the fracture behavior of a notched and fracture mechanics specimen. The method can be used for fatigue analysis. The random nature of cleavage fracture process determines that both the microscopic fracture stress and the macroscopic properties including fracture load, fracture toughness and the ductile to brittle transition temperature are all stochastic parameters. This understanding leads to the proposal of statistical assessment of cleavage induced notch toughness of ferritic steels according to a new local approach to cleavage fracture. The temperature independence of the two Weibull parameters in the new model induces a master curve to correlate the fracture load at different temperatures. A normalized stress combining the two Weibull parameters and the yield stress is proposed as the deterministic index to measure notch toughness. This proposed index is applied to compare the notch toughness of a ferritic steel with two different microstructures.

show abstract

Calibration of Beremin Parameters for 20MnMoNi55 Steel and Prediction of Reference Temperature (T0) for Different Thicknesses and a/W Ratios

Bhattacharyya

Acharyya

Dhar

et al. 2018

J Fail. Anal. and Preven.

View full text Add to dashboard Cite

Calibration of a new local approach to cleavage fracture of ferritic steels

Cited by 10 publications

References 7 publications

Statistical assessment of notch toughness against cleavage fracture of ferritic steels

Statistical assessment of notch toughness against cleavage fracture of ferritic steels

A new local approach model for cleavage fracture in ferritic steels and its validation

Calibration of Beremin Parameters for 20MnMoNi55 Steel and Prediction of Reference Temperature (T0) for Different Thicknesses and a/W Ratios

Contact Info

Product

Resources

About