Optimizing parallel section length for small tensile specimen with fabrication non-uniformity in thickness

2019 ◽  
Vol 147 ◽  
pp. 111244 ◽  
Author(s):  
Haiting Liu ◽  
Ran Chen ◽  
Mao Wen ◽  
Lei Zhang ◽  
Yao Shen
Keyword(s):  
Tensile Specimen ◽  
Parallel Section

scholarly journals Mechanical properties, deformation and fracture mechanisms of bimodal Cu under tensile test

2021 ◽  
Vol 60 (1) ◽  
pp. 15-24
Author(s):  
Silu Liu ◽  
Yonghao Zhao
Keyword(s):  
Yield Strength ◽  
Grain Refinement ◽  
Volume Fraction ◽  
Shear Fracture ◽  
High Strength ◽  
Tensile Specimen ◽  
Deformation Mechanisms ◽  
Fracture Mechanisms ◽  
Fracture Angle ◽  
Area Reduction

Abstract Metals with a bimodal grain size distribution have been found to have both high strength and good ductility. However, the coordinated deformation mechanisms underneath the ultrafine-grains (UFGs) and coarse grains (CGs) still remain undiscovered yet. In present work, a bimodal Cu with 80% volume fraction of recrystallized micro-grains was prepared by the annealing of equal-channel angular pressing (ECAP) processed ultrafine grained Cu at 473 K for 40 min. The bimodal Cu has an optimal strength-ductility combination (yield strength of 220 MPa and ductility of 34%), a larger shear fracture angle of 83∘ and a larger area reduction of 78% compared with the as-ECAPed UFG Cu (yield strength of 410 MPa, ductility of 16%, shear fracture angle of 70∘, area reduction of 69%). Grain refinement of recrystallized micro-grains and detwinning of annealing growth twins were observed in the fractured bimodal Cu tensile specimen. The underlying deformation mechanisms for grain refinement and detwinning were analyzed and discussed.

scholarly journals Effect of Microstructure and Notches on the Fracture Toughness of Medium Carbon Steel

1970 ◽  
Vol 3 (1) ◽  
pp. 15-22 ◽  
Author(s):  
SK Nath ◽  
Uttam Kr Das
Keyword(s):  
Fracture Toughness ◽  
Carbon Steel ◽  
Tensile Specimen ◽  
Medium Carbon Steel ◽  
Notch Angle ◽  
Medium Carbon ◽  
Fine Grained ◽  
Keywords Fracture ◽  
Fine Grained Structure ◽  
Marine Engineering

Fracture toughness (K1C) of medium carbon steel (0.5% C) has been determined by round notched tensile specimen. Two notch diameters (5.6mm and 4.2mm) and three notch angles (α) namely 45°, 60° and 75° have been used to observe the effect of notch diameters and notch angle on fracture toughness of the steel. By heat treatment the microstructure of the steel is also varied and its effect on the fracture toughness is also observed. It has been found that fine grained structure improves fracture toughness. Lower notch diameter and higher notch angle show higher value of K1C. Keywords: Fracture toughness, microstructure, notch, heat treatmentDOI: 10.3329/jname.v3i1.925 Journal of Naval Architecture and Marine Engineering 3(2006) 15-22

scholarly journals The Influence of Pressure Die Casting Parameters on Distribution of Reinforcing Particles in the AlSi11/10% SiC Composite

2013 ◽  
Vol 13 (3) ◽  
pp. 64-67 ◽  
Author(s):  
A. Pasieka ◽  
Z. Konopka
Keyword(s):  
Die Casting ◽  
Tensile Specimen ◽  
Entire Cross Section ◽  
Alloy Matrix ◽  
Piston Velocity ◽  
Particle Count ◽  
Second Stage ◽  
The Matrix ◽  
Intensification Pressure ◽  
Pressure Die Casting

Abstract The method of pressure die casting of composites with AlSi11 alloy matrix reinforced with 10 vol. % of SiC particles and the analysis of the distribution of particles within the matrix is presented. The composite castings were produced at various values of the piston velocity in the second stage of injection, at diverse intensification pressure values, and various injection gate width values. The distribution of particles over the entire cross-section of the tensile specimen is shown. The index of distribution was determined on the basis of particle count in elementary measuring fields. The regression equation describing the change of the considered index was found as a function of the pressure die casting parameters. The conclusion presents an analysis of the obtained results and their interpretation.

scholarly journals Assessment of mixed network processes with shared inputs and undesirable factors

2020 ◽  
Vol 30 (1) ◽  
Author(s):  
Maryam Nematizadeh ◽  
Alireza Amirteimoori ◽  
Sohrab Kordrostami ◽  
Mohsen Vaez-Ghasemi
Keyword(s):  
Data Envelopment Analysis ◽  
Real World ◽  
Network Data ◽  
Data Envelopment ◽  
Parallel Section ◽  
Mixed Network ◽  
Weak Disposability ◽  
Proposed Model ◽  
Shared Inputs

In the real world, there are processes whose structures are like a parallel-series mixed network. Network data envelopment analysis (NDEA) is one of the appropriate methods for assessing the performance of processes with these structures. In the paper, mixed processes with two parallel and series components are considered, in which the first component or parallel section consists of the shared in-puts, and the second component or series section consists of undesirable factors. By considering the weak disposability assumption for undesirable factors, a DEA approach as based on network slack-based measure (NSBM) is introduced to evaluate the performance of processes with mixed structures. The proposed model is illustrated with a real case study. Then, the model is developed to discriminate efficient units.

Mid Thickness Delayed Cracking of Z-Quality Offshore Steel

2011 ◽  
Author(s):  
Stig Gra˚berg ◽  
Lars Volden ◽  
Anthonius Johannes Paauw
Keyword(s):  
Thick Plate ◽  
Phosphorus Content ◽  
Manganese Sulfide ◽  
Steel Structure ◽  
Casting Process ◽  
Tensile Specimen ◽  
Material Behavior ◽  
Centre Line ◽  
Delayed Cracking ◽  
Ductile Behavior

During fabrication of a steel structure for an offshore modification project, delayed cracking was experienced in the mid plane or centre line of a 30 mm thick plate. The plate was part of a restraint box frame where 25 mm plates were welded to this 30 mm plate on both plate-surfaces. The applied 30 mm plate was a higher strength offshore steel (EN10225-S420 G2+M), with special through thickness properties and enhanced chemical composition as defined in material data sheet MDS Y30 of NORSOK M-120. Fracture mechanical testing including KV and CTOD in the mid plane confirmed that a very low toughness was present here with a brittle fracture type (cleavage). The plate was manufactured by the continuous casting process which due to centre line segregation resulted in high levels of manganese sulfide inclusions but also niobium carbides/nitrides. The plate manufacturer considered the documented toughness level as expected. Similar testing was performed on a 30 mm plate also delivered to the same material specification but of which the material certificate revealed a 10 times lower sulfur and phosphorus content indicating a much higher steel refinement. A significant higher toughness was obtained for this steel with high ductile behavior. Both steels showed a similar through thickness ductility, measured elongation for the through thickness tensile specimen, which implies that this property does not guaranty for the observed material behavior.

Study on Tensile Property and Strain Ageing Behavior of X100 Linepipe

2010 ◽  
Author(s):  
Yang Li ◽  
Weiwei Zhang ◽  
Shaotao Gong ◽  
Lingkang Ji ◽  
Chunyong Huo ◽  
...  
Keyword(s):  
Strain Curve ◽  
Tensile Specimen ◽  
Sampling Location ◽  
Stress Strain Curve ◽  
Long Distance ◽  
Noticeable Effect ◽  
Testing Method ◽  
Tension Tests ◽  
Tension Properties ◽  
The Difference

A series research programs and industrial trials of X100 linepipe have been launched by CNPC so as to build an X100 trial in China for long-distance gas pipeline in the coming years. In present paper, tests have been conducted on 20.6mm×1016mm diameter Grade X100 linepipe. The microstructures, tension properties will be presented. In order to investigate the influence of anti-corrosion coating process on the performance of pipe, strain aging tests in lab have been carried out as well. It is found that testing method, tensile specimen size and sampling location had a noticeable effect on the testing results. The difference is also observed between the flattened strap specimen and round bar. The influence of time, temperature and pre-strain amount of aging tests on the shape of S-S (stress-strain) curve, tension tests results, yield ratio of pipes are presented as well.

Characterization of fragmented structure developed during necking of iron tensile specimen

2021 ◽  
Vol 11 (4) ◽  
pp. 503-507
Author(s):  
Nikolay Zolotorevsky ◽  
Elina Ushanova ◽  
Valery Rybin ◽  
Vladimir Perevezentsev
Keyword(s):  
Tensile Specimen ◽  
Fragmented Structure
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