Specific fracture work of mild steels / Spezifische Bruchenergie von Flußstählen / L’ énergie spécifique de rupture des aciers doux

1973 ◽  
Vol 15 (1) ◽  
pp. 15-19
Author(s):  
J. C. Radon ◽  
E. Czoboly ◽  
G. Kristyak
Keyword(s):  
Specific Fracture ◽  
Fracture Work

scholarly journals Ensuring fire safety during the operation of oil and gas equipment based on the results of compact specimens tests

2021 ◽  
Vol 2094 (5) ◽  
pp. 052014
Author(s):  
G Kh Samigullin ◽  
L G Samigullina
Keyword(s):  
Experimental Data ◽  
Fire Safety ◽  
Oil And Gas ◽  
Test Method ◽  
Analytical Dependence ◽  
Safe Operation ◽  
Degree Of Damage ◽  
Specific Fracture ◽  
Fracture Work

Abstract The paper considers the application of the test method of compact specimens to assess the degree of damage of steel elements of oil and gas equipment. According to experimental data, an analytical dependence was obtained linking the degree of damage to the index of the specific fracture work, intended to assess the possibility of safe operation of explosive and fire-hazardous equipment.

scholarly journals Assessment of mechanical characteristics of steel subject to cyclic loads effect on non-standard compact specimens

2018 ◽  
Vol 224 ◽  
pp. 04025 ◽  
Author(s):  
Rim N. Khasanov ◽  
Aybulat S. Valiev ◽  
Iskander R. Kuzeev
Keyword(s):  
Damage Accumulation ◽  
Mechanical Characteristics ◽  
Cyclic Loads ◽  
Yield Limit ◽  
Fatigue Damage Accumulation ◽  
Series Of Experiments ◽  
Specific Fracture ◽  
Fracture Work ◽  
Dimensional Surface

It is showed by experiments that the use of compact specimens for determination of fracture work of steel that undertook cyclic deformations enables to identify metal with a number of cumulative fatigue damages. The yield limit determined in the first series of experiments was used for cycling parameters determination: 0.9 from the yield limit was set for damage accumulation in the elastoplastic stress range. At the same time an average cycle load was 8.9 kN, and an amplitude was 8.6 kN. It is demonstrated that specific fracture work increases upon the increase of compact specimens’ thickness. The tendency of specific fracture work decrease is observed upon fatigue damage accumulation. Thin specimens are particularly sensitive to damage accumulation. The results of the experiments indirectly support the hypothesis of fractional-dimensional surface layer existence.

Fracture Toughness and Fracture Mechanisms of PBT/PC/IM Blend

1992 ◽  
Vol 274 ◽  
Author(s):  
Jingshen Wu ◽  
Yiu-Wing Mai ◽  
Brian Cotterell
Keyword(s):  
Fracture Toughness ◽  
Impact Behavior ◽  
Effect Of Temperature ◽  
Fracture Mechanisms ◽  
Polybutylene Terephthalate ◽  
Different Temperatures ◽  
Work Concept ◽  
The Impact ◽  
Specific Fracture ◽  
Fracture Work

ABSTRACTStatic and impact fracture toughness of a Polybutylene terephthalate (PBT)/Polycarbonate (PC)/Impact modifier (IM) blend was studied at different temperatures. The experimental results were interpreted by the specific fracture work concept and J-integral analysis. It is found that the specific fracture work concept characterizes the impact behavior of the blend very well. In the static fracture tests the specific fracture work gives the crack initiation resistance of the blend which is consistent with the JIC value obtained. The effect of temperature was also examined and the fracture mechanisms were investigated via TEM and SEM. Extensive cavitation of the impact modifiers and plastic flow of matrix in the vicinity of the crack tip is believed to be the major toughening process of the enhanced fracture toughness.

Fracture mechanics in design and service: ‘living with defects’ - Application of fracture mechanics to rubber articles, including tyres

1981 ◽  
Vol 299 (1446) ◽  
pp. 189-202 ◽  
Keyword(s):  
Fracture Mechanics ◽  
Crack Growth ◽  
Strain Energy ◽  
Tensile Failure ◽  
Practical Application ◽  
Complicated Fracture ◽  
Fracture Work

The use of a fracture mechanics approach, based on the rate of release of strain energy, to account for various features of the failure of vulcanized rubbers is outlined. The properties considered include those to which fracture mechanics is often applied — tear, tensile failure, crack growth and fatigue — and others to which its application is less usual — abrasion, ozone attack and cutting by sharp objects. The relation of macroscopically observed properties to the basic molecular strength of the material is also discussed. An example of a quantitative practical application of the rubber fracture work, to groove cracking in tyres, is then considered. Finally, the rather more complicated fracture that can occur in rubber—cord laminates is discussed and it is shown that the energetics approach can be applied to some features, at least, of this.

Fracture Behaviour of Modified Spruce Wood: A Study Using Linear and Non Linear Fracture Mechanics

Holzforschung ◽  
2002 ◽  
Vol 56 (2) ◽  
pp. 191-198 ◽  
Author(s):  
Alexander Reiterer ◽  
Gerhard Sinn
Keyword(s):  
Fracture Energy ◽  
Heat Treatments ◽  
Critical Stress Intensity Factor ◽  
Mode I ◽  
Mode Iii ◽  
Fracture Properties ◽  
Specific Fracture Energy ◽  
Wedge Splitting Test ◽  
Splitting Test ◽  
Specific Fracture

Summary The fracture properties of unmodified and modified (heat treatments under various conditions and acetylation) sprucewood are investigated using the wedge splitting test. Fracture parameters measured include critical stress intensity factor and specific fracture energy under Mode I loading and specific fracture energy under Mode III loading. The Mode I fracture properties are reduced by all kinds of modification. However, acetylation leads to a reduction of only 20%whereas heat treatments reduce the properties to a much greater extent, approximately 50%to 80%. The Mode III fracture properties are influenced less. SEM pictures of the fracture surfaces support the described findings.

Classification and Management of Failed Fixation of the Volar Marginal Fragment in Distal Radius Fractures

2021 ◽  
Author(s):  
M. Carolina Orbay ◽  
Jorge L. Orbay
Keyword(s):  
Distal Radius ◽  
Patient Characteristics ◽  
Distal Radioulnar Joint ◽  
Distal Radius Fractures ◽  
Volar Plating ◽  
Radius Fractures ◽  
Fracture Patterns ◽  
Loss Of Reduction ◽  
Operative Fixation ◽  
Specific Fracture

AbstractGreater understanding of specific fracture patterns following distal radius fractures has arisen with the advent of volar plating. The volar marginal fragment (VMF) is a small peripheral piece of bone which is critical to carpal stability. Failure to achieve good fixation of the VMF can result in volar subluxation of the carpus and distal radioulnar joint instability. Due to its small, distal nature, this fragment can be easily missed and difficult to fix. Loss of reduction of the VMF following operative fixation presents specific challenges and surgical considerations dictated by patient characteristics and timing. Our goal of this review is to present a classification system for these failed VMFs which can help guide surgical treatment as well as expected outcomes.

scholarly journals Unstable Density-Driven Flow in Fractured Porous Media: The Fractured Elder Problem

Fluids ◽  
2019 ◽  
Vol 4 (3) ◽  
pp. 168
Author(s):  
Paiman Shafabakhsh ◽  
Marwan Fahs ◽  
Behzad Ataie-Ashtiani ◽  
Craig T. Simmons
Keyword(s):  
Porous Media ◽  
Convective Flow ◽  
Critical Rayleigh Number ◽  
Fracture Density ◽  
Fracture Networks ◽  
Homogeneous Case ◽  
Free Convective Flow ◽  
Density Driven Flow ◽  
Specific Fracture ◽  
Homogenous Case

The Elder problem is one of the well-known examples of an unstable density-driven flow (DDF) and solute transport in porous media. The goal of this research is to investigate the influence of fracture networks on this benchmark problem due to the great importance of the fractured heterogeneity effect on unstable DDF. For this aim, the fractured Elder problem is solved using COMSOL Multiphysics, which is a finite element method simulator. Uniform and orthogonal fracture networks are embedded to analyze free convective flow and development of unstable salt plumes. The results indicate that the mesh sensitivity of the fractured Elder problem is greater than the homogeneous case. Furthermore, it has been shown that in the fractured cases, the onset of instability and free convection occur with lower critical Rayleigh number, which means that fracture networks have a destabilizing effect. Also, we examined the structural properties of fracture networks that control convective flow patterns, and the simulation results show that the strength of convection and instability at the beginning of the intrusion is proportional to the aperture size of the fractures. Moreover, the increase of the fracture’s density leads different modes of transient convective modes, until a specific fracture density after which the transient convective modes become similar to the homogenous case.

On the energy consumption for crack development in fibre wall in disc refining – A micromechanical approach

Holzforschung ◽  
2009 ◽  
Vol 63 (2) ◽  
Author(s):  
Jan-Erik Berg ◽  
Mårten E. Gulliksson ◽  
Per A. Gradin
Keyword(s):  
Energy Density ◽  
Strain Energy ◽  
Microfibril Angle ◽  
Shear Load ◽  
Damage State ◽  
Material Parameters ◽  
Micromechanical Approach ◽  
Damage States ◽  
Loading Case ◽  
Specific Fracture

Abstract An analytical model has been applied to calculate the acquired strain energy density in order to achieve a certain damage state in a softwood fibre by uniaxial tension or shear load. The energy density was found to be dependent on the microfibril angle in the middle secondary wall, the loading case, the thicknesses of the fibre cell wall layers, and conditions, such as moisture content and temperature. At conditions, prevailing at the entrance of the gap between the plates in a refiner and at relative high damage states, more energy is needed to create cracks at higher microfibril angles. The energy density was lower for earlywood compared to latewood fibres. For low microfibril angles, the energy density was lower for loading in shear compared to tension for both earlywood and latewood fibres. Material parameters, such as initial damage state and specific fracture energy, were determined by fitting of input parameters to experimental data.

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