Phase morphology, fracture toughness and failure mechanisms in super-toughened PLA/PB-g-SAN/PMMA ternary blends: A quantitative analysis of crack resistance

2018 ◽  
Vol 67 ◽  
pp. 380-391 ◽  
Author(s):  
Majid Mehrabi Mazidi ◽  
Reyhaneh Berahman ◽  
Arman Edalat
Keyword(s):  
Fracture Toughness ◽  
Quantitative Analysis ◽  
Crack Resistance ◽  
Failure Mechanisms ◽  
Phase Morphology ◽  
Ternary Blends

Synergistic toughening effects of dispersed components in PP/PA6/EPDM ternary blends; quantitative analysis of the fracture toughness via the essential work of fracture (EWF) methodology

RSC Advances ◽  
2015 ◽  
Vol 5 (58) ◽  
pp. 47183-47198 ◽  
Author(s):  
Majid Mehrabi Mazidi ◽  
Mir Karim Razavi Aghjeh
Keyword(s):  
Fracture Toughness ◽  
Quantitative Analysis ◽  
Essential Work ◽  
Ternary Blends ◽  
Essential Work Of Fracture ◽  
Work Of Fracture

A synergistic toughening effect of soft EPDM particles and rigid PA6 domains for PP/PA/EPDM ternary blends was observed and the related micromechanisms were proposed.

Phase Morphology and its Role on Tensile Properties in Ternary Blends of PP/PC/SEBS

2012 ◽  
Vol 02 (04) ◽  
pp. 256-259
Author(s):  
Hadis Goodarzi ◽  
Omid Moini Jazani ◽  
Mohammad Reza Saeb
Keyword(s):  
Tensile Properties ◽  
Phase Morphology ◽  
Ternary Blends

scholarly journals Evaluation of crack resistance of welded joints with soft interlayers

2022 ◽  
Vol 21 (4) ◽  
pp. 308-311
Author(s):  
K. A. Molokov ◽  
V. V. Novikov
Keyword(s):  
Experimental Data ◽  
Fracture Toughness ◽  
Crack Resistance ◽  
Welded Joints ◽  
Low Cycle Fatigue ◽  
Transverse Load ◽  
Structural Elements ◽  
Metal Structures ◽  
Characteristic Appearance ◽  
Reliability Indicator

Introduction. Welded joints in large-sized metal structures (e.g., in the structures of ship hulls) subject to low-cycle fatigue are considered. The characteristic appearance of soft interlayers, which are significantly plastically deformed under working loads, was noted. Deformation of the metal structure with damage, especially in the form of cracks, reduces the strength and reliability of structural elements and joints. Pre-deformation negatively affects plasticity; therefore, much depends on the residual plasticity of the cracking material. At the same time, with a decrease in residual plasticity, such an important reliability indicator as the resistance of the material to crack propagation — the fracture toughness – decreases. The paper is devoted to the development of a model that includes analytical dependences for assessing the crack resistance of metal structures and their welded joints with soft interlayers according to the crack resistance limit for all crack sizes.Materials and Methods. The theory and methods of linear mechanics of materials destruction, structural-mechanical approach are used. The calculation results were analyzed and compared to the experimental data and other analytical solutions. The numerical experiment was performed for the ferrite-perlite steel grades of 10, 50, 22K, St3sp, etc., widely used in industry, as well as for alloy steels hardened to medium and high strength of 30KhGSA, 37KhN3A, etc. Results. Analytical dependences are obtained for calculating the relative crack resistance limit according to three main known mechanical characteristics of the state of the material of the soft interlayer of the welded joint.Discussion and Conclusions. The results obtained can be used to assess the crack resistance of pre-deformed structural elements and welded joints (including those with soft interlayers) operating under a transverse load. The results of experimental data and analytical calculations are shown in dimensionless form, which enables to obtain invariant results with respect to the fracture toughness limit.

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.

Prediction of Fracture Toughness of Steels According to the Microstructure and Chemical Composition

2020 ◽  
Vol 989 ◽  
pp. 353-358
Author(s):  
Yulia Bakhracheva
Keyword(s):  
Fracture Toughness ◽  
Chemical Composition ◽  
Crack Resistance ◽  
Single Parameter ◽  
Microstructure Parameters

The influence of microstructure parameters and chemical composition on the fracture toughness of steel is investigated. It is shown that the crack resistance of steel can not be reliably estimated only by a single parameter of the microstructure or only by chemical composition. A generalized parameter of microstructure and chemical composition, which correlates well with crack resistance, is proposed.

Three-Phase Morphology of Semicrystalline Polymer Semiconductors: A Quantitative Analysis

2015 ◽  
Vol 4 (9) ◽  
pp. 1051-1055 ◽  
Author(s):  
Roddel Remy ◽  
Sujun Wei ◽  
Luis M. Campos ◽  
Michael E. Mackay
Keyword(s):  
Quantitative Analysis ◽  
Phase Morphology ◽  
Semicrystalline Polymer ◽  
Polymer Semiconductors ◽  
Three Phase

Fracture toughness and failure mechanisms in un-vulcanized and dynamically vulcanized PP/EPDM/MWCNT blend-nanocomposites

RSC Advances ◽  
2015 ◽  
Vol 5 (87) ◽  
pp. 70817-70831 ◽  
Author(s):  
Mehrdad Khodabandelou ◽  
Mir Karim Razavi Aghjeh ◽  
Majid Mehrabi Mazidi
Keyword(s):  
Fracture Toughness ◽  
Crack Initiation ◽  
Crack Propagation ◽  
Failure Mechanisms ◽  
The Individual ◽  
P Addition ◽  
Blend Nanocomposites

Addition of MWCNTs into the PP/EPDM blend reduced the we and enhanced the βwp. In the blend-nanocomposites large MWCNT aggregates acted as favored sites for crack initiation, and the individual MWCNT impregnated fibrils arrested the crack propagation.

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