Numerical Prediction of Fracture Behavior for Austenitic and Martensitic Stainless Steels

2017 ◽  
Vol 09 (04) ◽  
pp. 1750052 ◽  
Author(s):  
Goran Vukelic ◽  
Josip Brnic
Keyword(s):  
Fracture Toughness ◽  
Stainless Steels ◽  
Fracture Behavior ◽  
Fe Analysis ◽  
Fe Model ◽  
Single Edge ◽  
Type Specimens ◽  
Martensitic Stainless Steels ◽  
Standardized Formula ◽  
Senb Specimen

Two types of stainless steels are compared in this paper, austenitic X15CrNiSi25-20 and martensitic X20Cr13, based on their numerically predicted fracture behavior. There are engineering applications where both of the steels can be considered for use and where these materials can be exposed to crack occurrence and growth, so proper distinction between them is desirable. Comparison is made on the basis of [Formula: see text]-integral values that are numerically determined using finite element (FE) stress analysis results. FE analysis is performed on compact tensile (CT) and single-edge notched bend (SENB) type specimens that are usually used in standardized [Formula: see text]-integral experimental procedures. Calculated [Formula: see text]-integral values are plotted versus crack growth lengths for mentioned specimens. Results show somewhat higher values of [Formula: see text]-integral for steel X20Cr13 than X15CrNiSi25-20. Further, when comparing [Formula: see text]-integral values obtained through FE model of CT and SENB specimen, it is noticed that CT specimens give somewhat conservative results. Results obtained by this analysis can be used in predicting fracture toughness assessment during design process.

CRUCIBLE 174 SXR

Alloy Digest ◽  
2009 ◽  
Vol 58 (5) ◽  
Keyword(s):  
Fracture Toughness ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Austenitic Stainless Steel ◽  
Stainless Steels ◽  
Precipitation Hardening ◽  
High Strength ◽  
Heat Treating ◽  
Martensitic Stainless Steels ◽  
Excellent Corrosion Resistance

Abstract Crucible 174 SXR is a premium-quality precipitation-hardening stainless steel designed for use as rifle barrels. It is a modification of Crucible’s 17Cr-4Ni that offers substantially improved machinability without sacrificing toughness. Its excellent corrosion resistance approaches that of a 300 series austenitic stainless steel, while its high strength is characteristic of 400 series martensitic stainless steels. At similar hardness levels, Crucible 174 SXR offers greater toughness than either the 410 or 416 stainless steels which are commonly used for rifle barrels. This datasheet provides information on composition, physical properties, hardness, and elasticity as well as fracture toughness. It also includes information on forming and heat treating. Filing Code: SS-1034. Producer or source: Crucible Service Centers.

Fracture Behavior of SiC-TiB2 Composite Measured by Different Test Methods

2011 ◽  
Vol 492 ◽  
pp. 14-17
Author(s):  
Liang Jiang ◽  
Yu Hong Chen ◽  
Bin Chen ◽  
Wen Zhou Sun
Keyword(s):  
Fracture Toughness ◽  
Fracture Behavior ◽  
Test Methods ◽  
Beam Specimen ◽  
Single Edge ◽  
Indentation Method ◽  
Flexure Strength ◽  
Sintering Additive ◽  
Varied Degree ◽  
Selection Of

SiC-TiB2composite was prepared by boron (B) and carbon(C) as sintering additive via presureless sintering in 2180°C. Fracture toughness of SiC-TiB2measured by indentation method and single edge notched beam specimen tenichques were analyzed and compared, and the most suitable indentation method equation was confirmed. Results revealed that the fracture toughness and flexure strength of the materials were influenced at varied degree by the content of TiB2, which had no effect on the selection of the most suitable equation for calculating the fracture toughness of the materials by indentation method. The fracture toughness decreases with the increasing TiB2content. When the TiB2content was 30%, SiC-TiB2composite had the best fracture toughness.

Effect of inclusions on fracture behavior of cast and wrought 13% Cr-4% Ni martensitic stainless steels

2017 ◽  
Vol 175 ◽  
pp. 262-278 ◽  
Author(s):  
Fayaz Foroozmehr ◽  
Yves Verreman ◽  
Jianqiang Chen ◽  
Denis Thibault ◽  
Philippe Bocher
Keyword(s):  
Stainless Steels ◽  
Fracture Behavior ◽  
Martensitic Stainless Steels

Evaluation of Impact Fracture Toughness of AZ31 Magnesium Alloy

2014 ◽  
Vol 566 ◽  
pp. 316-321 ◽  
Author(s):  
Tomoaki Kawa ◽  
Masaki Nagao ◽  
Toshiji Mukai
Keyword(s):  
Fracture Toughness ◽  
Magnesium Alloy ◽  
Az31 Alloy ◽  
Fe Analysis ◽  
Impact Fracture ◽  
Az31 Magnesium Alloy ◽  
Fe Model ◽  
Three Point Bending ◽  
Plastic Deformation Region ◽  
The Impact

The mechanical properties of magnesium alloys under dynamic loading have not been explored in sufficient depth. This research aims to estimate the impact fracture toughness of AZ31 magnesium alloy by finite element (FE) analysis. An FE model of impact three-point bending with three elastic bars is developed. FE analysis is presented for AZ31 magnesium alloy and compared with the results for 7075-T6 aluminum alloy as a reference. The FE analysis showed that the plastic deformation region is wider and the crack propagating rate is lower in the AZ31 specimen than in the 7075-T6 specimen. Moreover, the energy absorption capability and impact fracture toughness of AZ31 alloy were found to be higher than those of 7075-T6 alloy.

An Evaluation of Fracture Toughness of Glass-Filled Ceramic Using Notched Specimen

2006 ◽  
Vol 326-328 ◽  
pp. 927-930
Author(s):  
Jae Hoon Kim ◽  
Duck Hoi Kim ◽  
Nam Su Rho ◽  
Young Shin Lee ◽  
Song Heo Koo ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Dynamic Fracture ◽  
Dynamic Fracture Toughness ◽  
Dynamic Tests ◽  
Single Edge ◽  
Notch Radius ◽  
Cracked Beam ◽  
Notched Specimen ◽  
Static Fracture ◽  
Senb Specimen

The objective of this study is to evaluate the mechanical properties of static, quasidynamic and dynamic fracture toughness of glass-filled ceramic as promising structural material for a dome port cover of a ramjet engine system. Static and quasi-dynamic tests were carried out using SEPB (Single Edge Pre-cracked Beam) specimens. Static and dynamic fracture toughness tests were also performed using ASTM and strain gage methods with SENB (Single Edge Notched Beam) specimens machined with various notch radii. The critical notch radius was evaluated. Below the critical notch radius, the static fracture toughness of the SENB specimen well agreed with that of the SEPB specimen.

Fracture Behavior of Micro-Sized Specimens Prepared From an Amorphous Alloy Thin Film at Ambient and Elevated Temperatures

2001 ◽  
Vol 695 ◽  
Author(s):  
K. Takashima ◽  
R. Tarumi ◽  
Y. Higo
Keyword(s):  
Thin Film ◽  
Fracture Toughness ◽  
Amorphous Alloy ◽  
Cantilever Beam ◽  
Fracture Behavior ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Alloy Thin Film ◽  
Type Specimens ◽  
Beam Type

ABSTRACTFracture behavior of micro-sized cantilever beam type specimens prepared from an electroless deposited Ni-P amorphous alloy thin film has been investigated at ambient and elevated temperatures. Cantilever beam type specimens with dimensions of 10 x 12 x 50 μm3 were prepared from an electroless deposited Ni-P amorphous alloy thin film and notches were introduced by focused ion beam machining. Fatigue pre-cracks were introduced ahead of the notches. The introduction of fatigue pre-crack and fracture toughness tests were carried out using a mechanical testing machine for micro-sized specimens. The temperature of the specimen was controlled from room temperature to 473 K using a newly developed heating system. Compared with room temperature, fracture toughness increased approximately 40 % at 373 K but decreased 19 % at 473 K. The increase of fracture toughness at 373 K is considered to be related with the formation of nano-sized crystals and the decrease of fracture toughness at 473 K is considered to be due to the growth of crystals. It is required to consider the fracture behavior obtained in this investigation when designing actual MEMS devices using electroless deposited amorphous films.

Development of GTN Model Parameters for Simulating Ductile Fracture Behavior of X 70 Carbon Steel SENT Specimens

2019 ◽  
Author(s):  
Sung Ho Yoon ◽  
Tae-Young Ryu ◽  
Moon Ki Kim ◽  
Jae-Boong Choi ◽  
Ik-Joong Kim
Keyword(s):  
Carbon Steel ◽  
Ductile Fracture ◽  
Fracture Behavior ◽  
Boundary Effect ◽  
Test Method ◽  
Pipe Material ◽  
Single Edge ◽  
Fracture Characteristics ◽  
Gtn Model ◽  
Senb Specimen

Abstract Single-Edge-Notched-Bending (SENB) specimen is mainly used for fracture characteristics test of pipe material. However, there is also a disadvantage in that it does not sufficiently simulate the fracture characteristics of thin pipes due to the difference in boundary effect between the SENB specimen and the actual pipe. The Single-Edge-Notched-Tensile (SENT) specimen can be used as complementary test method due to its less boundary effect compared to the SENB specimen. In this study, the SENT specimen which are fabricated with API X 70 carbon steel was simulated ductile fracture behavior by using finite-element-analysis (FEA). To simulate ductile fracture behavior, Gurson-Tvergaard-Needleman (GTN) model was applied. GTN model is a kind of damage model that describes the behavior of ductile fracture through three steps of void changes : nucleation, growth, and coalescence. And GTN model is composed of three constitutive equations and nine parameters. In order to develop the GTN ductile fracture model for API X 70 carbon steel, five kinds of tensile specimen tests were simulated by FEA. In addition, we analyzed the influence of parameters of GTN model through analysis and developed optimal material parameters for API X 70 carbon steel. Finally, the ductile fracture behavior of the SENT specimen was simulated and the FEA results of SENT specimen was compared with actual SENT specimen test.

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