True stress-strain curve extraction from ion-irradiated materials via small tensile, small punch and nanoindentation tests: method development and accuracy/consistency verification

2020 ◽  
Vol 60 (5) ◽  
pp. 056012 ◽  
Author(s):  
Haiting Liu ◽  
Jiawei Ma ◽  
Ao Tang ◽  
Jingzhao Tang ◽  
Chonghong Zhang ◽  
...  
Keyword(s):  
Method Development ◽  
Strain Curve ◽  
True Stress ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Small Punch ◽  
Consistency Verification

scholarly journals Evaluation of Strength Properties of In-Service X80 Pipeline Steel Using Small Punch Test and Backpropagation Neural Network

2021 ◽  
Author(s):  
Ming Song ◽  
Xuyang Li ◽  
Wenchun Jiang ◽  
Jiru Zhong ◽  
Kaishu Guan
Keyword(s):  
Neural Network ◽  
Tensile Test ◽  
Strain Curve ◽  
True Stress ◽  
Small Punch Test ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Small Punch ◽  
Punch Test ◽  
Load Displacement

Abstract Evaluating the strength properties of materials of an in-service pipeline without shutting down transportation has been always a challenge. A novel and non-destructive method for determining the true stress-strain curve of pipeline steel based on backpropagation artificial neural network and small punch test is proposed in this study. The elastoplastic mechanical properties of the pipeline steels could be obtained by this method. The load-displacement curves of 2261 groups of different hypothetical materials were obtained by the finite element model of small punch test within Gurson-Tvergaard-Needleman (GTN) damage parameters and used to train the neural network. The relationship between the load-displacement curve of small punch test and the true stress-strain curve of the conventional uniaxial tensile test was established based on the trained neural network. The accuracy and wide applicability of the trained neural network were verified by the experimental data of four types of materials obtained by small punch test and standard tensile test, respectively. The established relationship can be used to predict the true stress-strain curve of the pipeline steels to determine the elastoplastic mechanical properties only by the load-displacement curve of the small punch test without performing the conventional tensile test.

A Novel Method to Predict the Mechanical Properties of DP600

2019 ◽  
Vol 795 ◽  
pp. 22-28
Author(s):  
Yun Qiang Peng ◽  
Li Xun Cai ◽  
Di Yao ◽  
Hui Chen ◽  
Guang Zhao Han
Keyword(s):  
Dual Phase Steel ◽  
Fracture Criterion ◽  
Strain Curve ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Small Punch ◽  
Critical Fracture ◽  
Stress Strain Relation ◽  
Novel Method ◽  
Related Stress

A small punch testing (SPT)-related stress-strain relation (SPT-SR) model is used to obtain the stress-strain curve of DP600 according to Chen-Cai equivalent energy method. And then the SPT and notched small punch testing (NSPT) specimens were simulated in order to determine the critical fracture criterion of DP600 on the basis of the stress-strain curve obtained by SPT-SR model. Lastly, the J resistance curve of small C-shaped inside edge-notched tension (CIET) specimen for DP600 dual-phase steel was successfully predicted based on the aforementioned fracture criterion.

Determination of true stress-strain curve for the weldment of aluminum laser-welded blanks

2005 ◽  
Vol 17 (3) ◽  
pp. 159-170 ◽  
Author(s):  
C. H. Cheng ◽  
L. C. Chan ◽  
C. Y. Tang ◽  
C. L. Chow
Keyword(s):  
Strain Curve ◽  
True Stress ◽  
Stress Strain Curve ◽  
Stress Strain

A Two-Load Method of Determining the Average True Stress-Strain Curve in Tension

1939 ◽  
Vol 6 (4) ◽  
pp. A156-A158
Author(s):  
C. W. MacGregor
Keyword(s):  
Strain Curve ◽  
True Stress ◽  
Massachusetts Institute ◽  
Massachusetts Institute Of Technology ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Before And After ◽  
Institute Of Technology ◽  
Reduction Of Area ◽  
Complete Average

Abstract The author describes a method, developed at the Massachusetts Institute of Technology, whereby the complete average true stress-strain curve in tension may be determined for a material from the beginning of yielding to fracture under ordinary testing speeds by the observation during the test of only two loads applied to a tapered specimen, namely, the maximum and fracture loads. Diameters at various positions along tapered specimens are measured before and after the test, and stress and reduction-of-area values computed from these observations.

Determination of constitutive relation from miniature tensile test with digital image correlation

2020 ◽  
Vol 55 (3-4) ◽  
pp. 99-108 ◽  
Author(s):  
Yunlu Zhang ◽  
Sreekar Karnati ◽  
Tan Pan ◽  
Frank Liou
Keyword(s):  
Digital Image Correlation ◽  
Tensile Test ◽  
Constitutive Relation ◽  
Digital Image ◽  
Strain Curve ◽  
True Stress ◽  
Image Correlation ◽  
Stress Strain Curve ◽  
Stress Strain

The determination of constitutive relation from the miniature tensile test is of high interest in multiple areas. Here, a convenient experimental method is proposed to determine the true stress–strain curve from the miniature tensile test. The instantaneous cross-sectional area is estimated by only one camera in aid of digital image correlation technique. This method was applied on commercial pure titanium and aluminum 6061 alloys, and the results indicate that the extracted true stress–strain curves are not scale-dependent. The derived mechanical properties from miniature specimens match well with the results of standard specimens. The correctness of the true stress–strain curve was evaluated by the finite element analysis method. The results suggest that the derived true stress–strain curve is capable to represent the constitutive behavior of the tested materials.

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