The influence of the out-of- and in-plane constraint on fracture toughness of high strength steel in the ductile to brittle transition temperature range

Neimitz, A.; Dzioba, Ihor

doi:10.1016/j.engfracmech.2015.07.017

Cited by 21 publications

(12 citation statements)

References 23 publications

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“…Following some simplifications and the selection of coefficients, it is possible to use Master Curves to predict brittle fracture in ferritic steels, for which 275 ≤ σ YS ≤ 825 (MPa). When assessing the fracture toughness in steels with a higher yield strength, σ YS > 825 (MPa), and, for K JC = f ( T ), the appropriate coefficients must be determined [27,28,29].…”

Section: Introductionmentioning

confidence: 99%

Fracture Mechanisms of S355 Steel—Experimental Research, FEM Simulation and SEM Observation

Dzioba

Lipiec

2019

Materials

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In this study, the fracture mechanisms of S355 ferritic steel were analyzed. In order to obtain different mechanisms of fracture (completely brittle, mixed brittle and ductile or completely ductile), tests were carried out over a temperature range of −120 to +20 °C. Our experimental research was supplemented with scanning electron microscopy (SEM) observations of the specimens’ fracture surfaces. Modeling and load simulations of specimens were performed using the finite element method (FEM) in the ABAQUS program, and accurate calibration of the true stress–strain material dependence was made. In addition, the development of mechanical fields before the crack tip of the cracking process in the steel was analyzed. The distributions of stresses and strains in the local area before the crack front were determined for specimens fractured according to different mechanisms. Finally, the conditions and characteristic values of stresses and strains which caused different mechanisms of fracture—fully brittle, mixed brittle and ductile or fully ductile—were determined.

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Section: Introductionmentioning

confidence: 99%

Fracture Mechanisms of S355 Steel—Experimental Research, FEM Simulation and SEM Observation

Dzioba

Lipiec

2019

Materials

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“…For room temperature, T 1 = 20 °C, the integral in accordance with the Rice formula reached J C = 46 kN/m, and as the test temperature lowered, T 2 = −50 °C, the critical value of J -integral decreased slightly, reaching J C = 40 kN/m, which was consistent with expectations. For metals, particularly ferritic steels, a decrease of the test temperature will reduce critical fracture toughness characteristics [ 42 , 43 , 44 , 45 , 46 ].…”

Section: Results Of Experimental Testsmentioning

confidence: 99%

“…AE signals of classes 2, 3 and 4 could be observed already at early stages of sample loading, before value P max is reached. The signals were generated because the brittle fracture toughness of the materials was reduced along with the decrease in temperature [ 42 , 43 , 44 , 45 , 46 ]. That was why at T 2 = −50 °C brittle phase fracture in the transition zone occurred at a lower load (i.e., classes 2 and 3) which, in turn, led to the fracture caused by shear in the connecting layer of the AA1050 alloy (class 4).…”

Section: Discussionmentioning

confidence: 99%

Using AE Signals to Investigate the Fracture Process in an Al–Ti Laminate

et al. 2020

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The paper describes tests conducted to identify the mechanisms occurring during the fracture of single-edge notches loaded in three-point bending (SENB) specimens made from an Al–Ti laminate. The experimental tests were complemented with microstructural analyses of the specimens’ fracture surfaces and an in-depth analysis of acoustic emission (AE) signals. The paper presents the application of the AE method to identify fracture processes in the layered Al–Ti composite using a non-hierarchical method for clustering AE signals (k-means) and analyses using waveform time domain, waveform time domain (autocorrelation), fast Fourier transform (FFT Real) and waveform continuous wavelet based on the Morlet wavelet. These analyses made it possible to identify different fracture mechanisms in Al–Ti composites which is very significant to the assessment of the safety of structures made of this material.

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“…Another aspect that needs attention is the inappropriate stiffness change in the Al-Ti laminate specimen. Temperature reduction in the elements made of these materials usually causes an increase in their stiffness, which is the effect of an increase in the values of strength characteristics, primarily Young's Modulus [42][43][44]. The diagrams of CT specimens made of a single monolithic material (Figure 3a,b) show that this tendency proves to be less true for Al alloy and truer for Ti alloy.…”

Section: Fracture Toughnessmentioning

confidence: 99%

Investigation of the Fracture Process of Explosively Welded AA2519–AA1050–Ti6Al4V Layered Material

et al. 2020

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The study presents an analysis of the cracking process of explosive welded layered material AA2519–AA1050–Ti6Al4V (Al–Ti laminate) at ambient (293 K) and reduced (223 and 77 K) temperatures. Fracture toughness tests were conducted for specimens made of base materials and Al–Ti laminate. As a result of loading, delamination cracking occurred in the bonding layer of specimens made from Al–Ti laminate. To define the crack mechanisms that occur at the tested temperatures, a fracture analysis was made using a scanning electron microscope. Moreover, acoustic emission (AE) signals were recorded while loading. AE signals were segregated to link their groups with respective cracking process mechanisms. Numerical models of the tested specimens were developed, taking into account the complexity of the laminate structure and the ambiguity of the cracking process. A load simulation using the finite element method FEM allowed calculating stress distributions in the local area in the crack tip of the Al–Ti laminate specimens, which enabled the explanation of significant material cracking process development aspects. Results analysis showed an influence of interlayer delamination crack growth on the process of the Al–Ti laminate specimen cracking and the level of KQ characteristics at different temperatures.

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The influence of the out-of- and in-plane constraint on fracture toughness of high strength steel in the ductile to brittle transition temperature range

Cited by 21 publications

References 23 publications

Fracture Mechanisms of S355 Steel—Experimental Research, FEM Simulation and SEM Observation

Fracture Mechanisms of S355 Steel—Experimental Research, FEM Simulation and SEM Observation

Using AE Signals to Investigate the Fracture Process in an Al–Ti Laminate

Investigation of the Fracture Process of Explosively Welded AA2519–AA1050–Ti6Al4V Layered Material

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