A Tensile Characterization Study of Metal Sheet in Large-Strain

2006 ◽  
Author(s):  
W. J. Dan ◽  
W. G. Zhang ◽  
S. H. Li ◽  
Z. Q. Lin
Keyword(s):  
Large Strain ◽  
True Strain ◽  
Digital Camera ◽  
Strain Curve ◽  
Plastic Instability ◽  
Tensile Specimen ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Tension Tests ◽  
Tensile Experiment

A method for determining the strain-stress curve of larger-strain is proposed when plastic instability occurs in standard tension tests. Thin tested steel sheet is subjected to tension loading until fracture occurs. The deformation process is captured with a digital camera. Displacement and strain field of material deformation can be calculated by a mesh-free PIM method. A tensile experiment is simulated to verify that local measuring stress-strain curve by PIM method near the center of the specimen can describe a full stress-strain curve clearly. Numerical simulation results, at different location along the specimen axial, present that different parts of specimen have different deformation distribution in tensile and the center fracture part of tensile specimen is the only region which can experience full strain. The true stress- true strain curves, based on the estimated parameters, are validated in all strain regions by comparison with curves from standard tension tests. The measured curves by PIM method are very stabilization. Compared with several material constitutive equations, The Swift’s equation is very close to experiment curve at plastic deformation.

Mechanical Behavior of Materials under Tensile Loads

2004 ◽  
pp. 13-31
Keyword(s):  
Tensile Test ◽  
Mechanical Behavior ◽  
Tensile Deformation ◽  
True Strain ◽  
Strain Curve ◽  
Tensile Specimen ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Mathematical Expressions ◽  
Reduction In Area

Abstract This chapter focuses on mechanical behavior under conditions of uniaxial tension during tensile testing. It begins with a discussion on the parameters that are used to describe the engineering stress-strain curve of a metal, namely, tensile strength, yield strength or yield point, percent elongation, and reduction in area. This is followed by a section describing the parameters determined from the true stress-true strain curve. The chapter then presents the mathematical expressions for the flow curve. Next, it reviews the effect of strain rate and temperature on the stress-strain curve. The chapter then describes the instability in tensile deformation and stress distribution at the neck in the tensile specimen. It discusses the processes involved in ductility measurement and notch tensile test in tensile specimens. The parameter that is commonly used to characterize the anisotropy of sheet metal is covered. Finally, the chapter covers the characterization of fractures in tensile test specimens.

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.

Measurement method for stress–strain curve in a super-large strain range

2014 ◽  
Vol 600 ◽  
pp. 82-89 ◽  
Author(s):  
Yasuhiro Yogo ◽  
Masatoshi Sawamura ◽  
Masafumi Hosoya ◽  
Michiaki Kamiyama ◽  
Noritoshi Iwata ◽  
...  
Keyword(s):  
Measurement Method ◽  
Large Strain ◽  
Strain Curve ◽  
Strain Range ◽  
Stress Strain Curve ◽  
Stress Strain

Extensibility changes of calcified soft tissue strips from human aorta

1987 ◽  
Vol 65 (9) ◽  
pp. 1878-1883 ◽  
Author(s):  
M. H. Sherebrin ◽  
H. A. Bernans ◽  
Margot R. Roach
Keyword(s):  
Breaking Strength ◽  
True Strain ◽  
Testing Machine ◽  
High Stress ◽  
Strain Curve ◽  
Human Aorta ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Tensile Testing Machine ◽  
Calcified Tissue

Some degree of calcification was noted in more than half of the 59 aortas of individuals aged from 15 to 88 we have examined at autopsy. The calcification, which is determined by x-raying the opened and flat aorta, is in patches. We have studied the influence of calcification on stress versus strain, breaking strength, and modulus of elasticity of strips of aorta to determine its importance in vascular disease. Strips of aortic wall 5 × 30 mm were cut with orientation parallel or perpendicular to the vessel axis. Elongation versus load was measured with an Instron tensile testing machine. The true stress and true strain were calculated for both calcified and uncalcified strips from the thoracic and abdominal regions in both orientations. From the stress–strain curve the following values were selected: strain, stress, and slope at 80 mmHg equivalent pressure (1 mmHg = 133.3 Pa); maximum stress, strain, and slope; and breaking stress, strain, and slope if the sample broke. There were statistically significant differences in 13 of the 36 categories between calcified and uncalcified strips. The breaking strength and strain is lower in the calcified strips. The stress–strain curve for the uncalcified strip was mathematically transformed by reducing the amount of elongation so that the curve coincided with that of the calcified strip for eight matched pairs from the same individuals. The calcification appears to immobilize part of the strip, probably causing the boundary of the calcified tissue to be a region of high stress where tissue breakdown can occur.

scholarly journals Stress-strain curve of pure aluminum in a super large strain range with strain rate and temperature dependency

2017 ◽  
Vol 207 ◽  
pp. 161-166 ◽  
Author(s):  
Yasuhiro Yogo ◽  
Masatoshi Sawamura ◽  
Risa Harada ◽  
Kosei Miyata ◽  
Noritoshi Iwata ◽  
...  
Keyword(s):  
Strain Rate ◽  
Large Strain ◽  
Pure Aluminum ◽  
Strain Curve ◽  
Strain Range ◽  
Temperature Dependency ◽  
Stress Strain Curve ◽  
Stress Strain

Towards the Problem of Construction an SPD Stress-Strain Curve for Low-Plastic Materials

2020 ◽  
Vol 839 ◽  
pp. 189-195
Author(s):  
Pavel G. Morrev ◽  
Kostya I. Kapyrin ◽  
I.M. Gryadunov ◽  
Sergey Y. Radchenko ◽  
Daniil O. Dorokhov ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Shear Band ◽  
Severe Plastic Deformation ◽  
Initial Segment ◽  
Large Strain ◽  
Strain Curve ◽  
Deep Rolling ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Plastic Materials

Stress-strain curve construction for low-plastic alloys under severe plastic deformation conditions is considered. A material under investigation is cast bronze Cu85-Pb5-Sn5-Zn5. Experiments on upsetting and deep rolling were conducted. Based on these data, the initial hardening modular and the hardening modular at large strain were evaluated. Classic tests on determining an initial segment of stress-strain curve can lead to grate mistakes because shear band sliding can diminishes appreciably both yield stress and hardening modular. A correct methodology for stress-strain curve construction is proposed.

A special notched tensile specimen to determine the flow stress-strain curve of hardening materials without applying the Bridgman correction

2017 ◽  
Vol 179 ◽  
pp. 225-239 ◽  
Author(s):  
Shengwen Tu ◽  
Xiaobo Ren ◽  
Bård Nyhus ◽  
Odd Magne Akselsen ◽  
Jianying He ◽  
...  
Keyword(s):  
Flow Stress ◽  
Strain Curve ◽  
Tensile Specimen ◽  
Stress Strain Curve ◽  
Stress Strain
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