scholarly journals Effect of temperature and exploitation time on tensile properties and plain strain fracture toughness, KIc, in a welded joint

2018 ◽  
Vol 9 ◽  
pp. 279-286
Author(s):  
Ivica Čamagić ◽  
Simon Sedmak ◽  
Aleksandar Sedmak ◽  
Zijah Burzić ◽  
Mladen Marsenić
Keyword(s):  
Fracture Toughness ◽  
Tensile Properties ◽  
Welded Joint ◽  
Effect Of Temperature ◽  
Strain Fracture ◽  
Plain Strain

scholarly journals The impact of the temperature and exploitation time on the tensile properties and plain strain fracture toughness, KIc in characteristic areas of welded joint

2018 ◽  
Vol 12 (46) ◽  
pp. 371-382 ◽  
Author(s):  
Simon Sedmak ◽  
Ivica Čamagić ◽  
Aleksandar Sedmak ◽  
Zijah Burzić ◽  
Mihajlo Aranđelović
Keyword(s):  
Fracture Toughness ◽  
Tensile Properties ◽  
Welded Joint ◽  
Strain Fracture ◽  
Plain Strain ◽  
The Impact

scholarly journals EXPERIMENTAL FINDING OF FRACTURE TOUGHNESS CHARACTERISTICS AND THEORETICAL MODELING OF CRACK PROPAGATION PROCESSES IN CARBON FIBER SAMPLES UNDER CONDITIONS OF ADDITIVE PRODUCTION

2019 ◽  
Vol 16 (33) ◽  
pp. 325-336
Author(s):  
V. N. DOBRYANSKIY ◽  
L. N. RABINSKIY ◽  
O. V. TUSHAVINA
Keyword(s):  
Fracture Toughness ◽  
Carbon Fiber ◽  
Crack Resistance ◽  
Tensile Properties ◽  
Practical Importance ◽  
Effect Of Temperature ◽  
Zone Model ◽  
Cohesive Elements ◽  
Damage Development ◽  
Mechanical Tensile

The relevance of the problem stated in this article is that the development of aerospace technology increased the demand for good quality materials. An important issue is ensuring durability in conditions of longterm loads and in conditions of damage development. One of the criteria that ensure the toughness of the material is crack resistance. The aim of the work is to study the interlayer crack resistance (fracture toughness) under loading under conditions of separation and transverse shear, interlayer strength, as well as the effect of temperature on interlayer strength, mechanical tensile properties. A comparison of the values of interlayer crack resistance GIС (separation) and GIIС (shear) and of mechanical tensile properties and interlayer strength of carbon fiber samples is made. The main methods for studying this problem were the short-beam method, the DCB method, the ENF method. The results of the experimental data were compared with modeling the processes of the appearance and development of cracks in the finite element complexes ABAQUS and Ansys based on the VVCT models, cohesive elements. Deviations from the experiment were found and conclusions were drawn that the point of application of the load had to be shifted from the edge of the sample, which will reduce the initial separation and increase the stiffness of the sample. Due to the fact that the cohesion zone model is very sensitive to input parameters, it is necessary to know many parameters and take into account a large number of factors. The practical importance of this work is to show how to use the VCCT model to obtain the critical load of the germination of the first crack. The research technique can be used for further experiments, including simulation further stratification with low inaccuracy.

Fracture Toughness and Fatigue Behavior of T7451 Al-Zn-Mg-Cu Alloy Thick Plate

2014 ◽  
Vol 788 ◽  
pp. 223-230 ◽  
Author(s):  
Li Li Wei ◽  
Qing Lin Pan ◽  
Yi Lin Wang ◽  
Lei Feng
Keyword(s):  
Mechanical Property ◽  
Fracture Toughness ◽  
Fatigue Resistance ◽  
Fatigue Behavior ◽  
Plate Thickness ◽  
Transgranular Fracture ◽  
Cu Alloy ◽  
Tensile Fatigue ◽  
Strain Fracture ◽  
Plain Strain

The mechanical property, fracture toughness and fatigue behavior of T7451 Al-Zn-Mg-Cu alloy thick plates in different orientations and with various thicknesses were investigated by means of tensile, fatigue and plain strain fracture toughness testing. And the microstructures and fracture morphologies were analyzed with optical microscopy and scanning electron microscopy. The results showed that the samples in longitudinal (L)-transversal (T) orientation possessed better mechanical property, fracture toughness and fatigue resistance than that in T-L orientation. Fractography and optical microanalysis clearly demonstrated that the feature of recrystallized grains is the decisive factor for this anisotropy. On the other hand, values of strength and fracture toughness decreased with the increase of plate thickness, but their fatigue crack growth rate became slower. Combined with the fractography analysis, the increase of recrystallization degree and the coarser grains in the thicker plate should be the main reason for the detrimental to the strength and toughness properties since the main fracture mechanism changes from ductile transgranular fracture to intergranular failure. However, these coarse recrystallized grains play an advantageous role for fatigue resistance from crack deflection and closure perspectives.

Fracture Toughness of Structural Members

2012 ◽  
Vol 726 ◽  
pp. 195-202 ◽  
Author(s):  
Andrzej Neimitz
Keyword(s):  
Fracture Toughness ◽  
Fracture Mechanics ◽  
Reference State ◽  
Finite Strains ◽  
Structural Members ◽  
Local Approach ◽  
Strain Fracture ◽  
Out Of Plane ◽  
Plain Strain

Abstract. In the paper several formulae to compute the fracture toughness are presented. The formulae include either parameter characterizing the in-plane constraint or out-of-plane constraint or both. The formulae are based on different assumptions and approaches to fracture mechanics. Namely, small or finite strains were assumed, global or local approach was adopted. In all cases the standard, plain strain fracture toughness was used as a reference state.

scholarly journals Effect of Grain Refiner on Fracture Toughness of 7050 Ingot and Plate

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6705
Author(s):  
Fang Yu ◽  
Xiangjie Wang ◽  
Tongjian Huang ◽  
Daiyi Chao
Keyword(s):  
Electron Microscopy ◽  
Heat Treatment ◽  
Fracture Toughness ◽  
Grain Size ◽  
Tensile Properties ◽  
Thick Plate ◽  
Energy Dispersive Spectrometer ◽  
Grain Refiner ◽  
Strain Fracture ◽  
Optical Electron

In this paper, two types of grain refining alloys, Al-3Ti-0.15C and Al-5Ti-0.2B, were used to cast two types of 7050 rolling ingots. The effect of Al-3Ti-0.15C and Al-5Ti-0.2B grain refiners on fracture toughness in different directions for 7050 ingots after heat treatment and 7050-T7651 plates was investigated using optical electron microscopy (OEM) and scanning electron microscopy (SEM). Mechanical properties testing included both tensile and plane strain fracture toughness (KIC). The grain size was measured from the surface to the center of the 7050 ingots with two different grain refiners. The fracture surface was analyzed by SEM and energy dispersive spectrometer (EDS). The experiments showed the grain size from edge to center was reduced in 7050 ingots with both the TiC and TiB refiners, and the grain size was larger for ingots with the Al-3Ti-0.15C grain refiner at the same position. The tensile properties of 7050 ingots after heat treatment with Al-3Ti-0.15C grain refiner were 1–2 MPa lower than the ingot with the Al-5Ti-0.2B grain refiner. For the 7050-T7651 100 mm thick plate with the Al-3Ti-0.15C grain refiner, for the L direction, the tensile properties were lower by about 10~15 MPa; for the plate with the Al-3Ti-0.15C refiner than plate with Al-5Ti-0.2B refiner, for the LT direction, the tensile properties were lower by about 13–18 MPa; and for the ST direction, they were lower by about 8–10 MPa compared to that of Al-5Ti-0.2B refiner. The fracture toughness of the 7050-T7651 plate produced using the Al-3Ti-0.15C ingot was approximately 2–6 MPa · m higher than the plate produced from the Al-5Ti-0.2B ingot. Fractography of the failed fracture toughness specimens revealed that the path of crack propagation of the 7050 ingot after heat treatment produced from the Al-3Ti-0.15C grain refiner was more tortuous than in the ingot produced from the Al-5Ti-0.2B, which resulted in higher fracture toughness.

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