Material Characterization and Modeling of High Strength PM Steel

2011 ◽  
Vol 337 ◽  
pp. 766-769
Author(s):  
Sachin B Mirajkar ◽  
K. Gopinath ◽  
Raghu V. Prakash
Keyword(s):  
Material Characterization ◽  
High Strength ◽  
Fine Tuning ◽  
Density Range ◽  
Test Results ◽  
Structural Alloy ◽  
Gtn Model ◽  
Experimental Values ◽  
Porosity Characterization

Powder Metallurgy (PM) component properties are influenced by the pore morphology, size, size-distribution and pore content [1]. Structural alloy Astaloy LH mechanical properties are characterized for density range 6.3 to 7.1 g/cm3. Porosity characterization of the material is also done using ASTM standard. In the first phase, an attempt is made to predict the tensile property using Gurson-Tvergaard-Needleman (GTN) model and FEM. The prediction is verified with tensile test results. It is observed that after fine tuning the parameters in the model, the prediction is found to be close to experimental values.

scholarly journals Seismic Behavior and Force-Displacement Characterization of Neotype Column-Slab High Piers

2014 ◽  
Vol 2014 ◽  
pp. 1-10
Author(s):  
YanQun Zhou ◽  
YeZhi Zhang ◽  
MeiXin Ye ◽  
MengSi Zhan
Keyword(s):  
Seismic Behavior ◽  
Large Scale ◽  
Scale Model ◽  
Test Results ◽  
Lateral Displacements ◽  
High Pier ◽  
Experimental Values ◽  
Large Scale Tests ◽  
Force Displacement

The seismic behavior and plasticity spreading of a neotype column-slab high pier are researched in this paper. Four scale model tests of a web slab with two boundary columns are carried out under cyclic inelastic lateral displacements simulating seismic response. The test results show that the neotype column-slab high pier has strong and stable bearing capacity, good ductility, and energy dissipation capacity. The experimental values pertaining to the spread of plasticity are derived. An approach for deriving the spread of plasticity analytically is deduced and applied to the four tests. This method accurately assesses a pier’s spread of plasticity for most ductility levels. At nearly all ductility levels, the mean difference between analytical assessments of the spread of plasticity and results from 4 large-scale tests is 12% with a 9% coefficient of variation.

scholarly journals Proportioning and Characterization of Reactive Powder Concrete for an Energy Storage Pile Application

2018 ◽  
Vol 8 (12) ◽  
pp. 2507 ◽  
Author(s):  
Umut Bektimirova ◽  
Chang-Seon Shon ◽  
Dichuan Zhang ◽  
Eldar Sharafutdinov ◽  
Jong Kim
Keyword(s):  
Energy Storage ◽  
Silica Fume ◽  
Setting Time ◽  
Drying Shrinkage ◽  
High Strength ◽  
Reactive Powder Concrete ◽  
Test Results ◽  
Compressive And Flexural Strengths ◽  
Reactive Powder

Reactive Powder Concrete (RPC) is a newly emerging concrete material that is being used for various applications where high-strength concrete is required. RPC is obtained by removing coarse aggregates and adding fine powders such as silica fume into the concrete mixture. This research has focused on the proportioning and characterization of RPC mixture to be used as a material for energy storage pile application. For mixture parameters, the water-to-binder ratio (WB), silica fume (SF) content, and normal and warm temperature curing have been selected. The relative flowability, penetration resistance, setting time, drying shrinkage, and compressive and flexural strengths were evaluated. Based on the test results, the mixture with WB = 0.22 and SF = 20% was the best mixture with the highest tensile strength and other characteristics. Response surface methodology (RSM) was used to design the experiments and find the optimum mixture proportions to achieve the highest compressive strength. The optimum WB and SF content to achieve the highest strength for combined ages (7 days, 28 days, and 56 days) was determined to be WB = 0.213 and SF = 20%. Through the comparison between the test results and the required strength from analytical simulations, the RPC studied in this paper was deemed to be suitable for the energy storage pile.

Material characterization of high-frequency mechanical impact (HFMI)-treated high-strength steel

2016 ◽  
Vol 89 ◽  
pp. 205-214 ◽  
Author(s):  
Eeva Mikkola ◽  
Gary Marquis ◽  
Pauli Lehto ◽  
Heikki Remes ◽  
Hannu Hänninen
Keyword(s):  
High Frequency ◽  
High Strength Steel ◽  
Material Characterization ◽  
High Strength ◽  
Mechanical Impact

Applicability of Existing Fracture Initiation Models to High-Strength Steel Line Pipe

2010 ◽  
Author(s):  
Do-Jun Shim ◽  
Gery Wilkowski ◽  
Frederick Brust ◽  
David Horsley ◽  
Max Toch
Keyword(s):  
High Strength Steel ◽  
High Strength ◽  
Fracture Initiation ◽  
Failure Behavior ◽  
Surface Cracks ◽  
Test Results ◽  
Fracture Criteria ◽  
Line Pipe ◽  
Steel Pipes

The original fracture criteria developed by Maxey/Kiefner for axial through-wall and surface-cracked pipes have worked well for many industries for a large variety of low strength and low toughness materials. However, newer line-pipe steels have some unusual characteristics that differ from these older materials. One example is a single test that has demonstrated that X100 line-pipe with an axial through-wall-crack can fail at pressures about 30 percent lower than predicted with commonly used analysis methods for older steels. Thus, it is essential to review the currently available models and investigate the applicability of these models to newer high-strength line pipe materials. In this paper, the available models for predicting the failure behavior of axial-cracked pipes (through-wall-cracked and external surface-cracked pipes) were reviewed. The applicability of these models to high-strength steel pipes was investigated by analyzing limited full-scale pipe fracture initiation test results and the shortcomings were identified. For both through-wall and surface cracks, the major shortcomings were related to the characterization of the material toughness, which generally leads to non-conservative predictions in the J-T analyses. The findings in this paper may be limited to the test data that was consider for this study. The requisite characteristics of a potential model were also identified.

Characterization of high strength cement paste with pristine graphite and heptane-graphite emulsion

2016 ◽  
Author(s):  
Aileen Vandenberg ◽  
Daniel Massucci ◽  
Steven Woltornist ◽  
Douglas Adamson ◽  
Kay Wille
Keyword(s):  
Cement Paste ◽  
High Strength

Characterization of Clad Joints of High Strength Low Alloy Steel with Stainless Steel and Titanium

2018 ◽  
Vol 51 (4) ◽  
pp. 46
Author(s):  
N. Venkateswara Rao ◽  
G. Madhusudhan Reddy ◽  
S. Nagarjuna
Keyword(s):  
Stainless Steel ◽  
Alloy Steel ◽  
High Strength ◽  
Low Alloy Steel

scholarly journals Characterization of Phosphate Coatings: Influence of the Acid Pickling Conditions

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1048
Author(s):  
Belén Díaz ◽  
X. Ramón Nóvoa ◽  
Carmen Pérez ◽  
Sheila Silva-Fernández
Keyword(s):  
Citric Acid ◽  
High Strength ◽  
Acid Pickling ◽  
Acid Cleaning ◽  
Inorganic Acids ◽  
Phosphate Coatings ◽  
Acid Bath ◽  
Coating Morphology ◽  
Coating Weight

This research emphasizes the importance of the acid cleaning prior to the phosphate development on high-strength steel rods. It compares the phosphate properties achieved after different acid-pickling conditions. The most common inorganic acids were considered in this study. Additionally, taking into account the environmental and safety concerns of these acids, the assessment of a less harmful organic acid is presented. This study revealed significant differences in the coating morphology and chemical composition whereas no great changes were found in terms of the coating weight or porosity. Thus, hydrochloric and sulfuric acid promote the growth of a Fe-enriched phosphate layer with a less conductive character that is not developed after the pickling with phosphoric acid. The phosphate developed after the citric acid pickling is comparable to that developed after the inorganic acids although with a porosity slightly higher. The temperature of the citric acid bath is an important parameter that affects to the phosphate appearance, composition, and porosity.

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