An innovation active set strategy reliability optimization method for cushioning design based on dynamic stress–strain curve

2021 ◽  
Author(s):  
Xue An ◽  
Dongyan Shi
Keyword(s):  
Dynamic Stress ◽  
Strain Curve ◽  
Optimization Method ◽  
Reliability Optimization ◽  
Stress Strain Curve ◽  
Active Set ◽  
Stress Strain ◽  
Active Set Strategy

Dynamic Stress-Strain Relations for Annealed 2S Aluminum Under Compression Impact

1953 ◽  
Vol 20 (4) ◽  
pp. 523-529
Author(s):  
J. E. Johnson ◽  
D. S. Wood ◽  
D. S. Clark
Keyword(s):  
Dynamic Stress ◽  
Strain Curve ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Impact Stress ◽  
Stress Strain Relation ◽  
Final Strain ◽  
Dynamic Relations ◽  
Single Stress ◽  
The Impact

Abstract This paper presents the results of an experimental study of the stress-strain relation of annealed 2S aluminum when subjected to compression impact. Two methods of securing a dynamic stress-strain curve are considered, namely, from the measurement of impact stress as a function of maximum plastic strain, and impact stress as a function of the impact velocity. The dynamic stress-strain curves obtained by these methods lie considerably above the static curve. The elevation in stress of the dynamic relations above the static relation increases progressively from zero at the elastic limit to about 20 per cent at a strain of 4.5 per cent. However, the two dynamic relations are not coincident which indicates that the behavior of the material cannot be described by a single stress-strain curve for all impact velocities. A family of stress-strain curves which differ slightly from each other and which depend upon the final strain is postulated in order to correlate both sets of data adequately.

Composite Logarithmic Model for Dynamic Stress–Strain Curve of Soft Soil

2011 ◽  
Vol 4 (3) ◽  
pp. 1193-1196
Author(s):  
Wei Wang ◽  
Gaojie Pan ◽  
Zeng Pan ◽  
Ganwu Zhou ◽  
Hua Ling
Keyword(s):  
Dynamic Stress ◽  
Soft Soil ◽  
Strain Curve ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Logarithmic Model

On the Estimation of Dynamic Stress-Strain Curve By Impact Bending Test

2004 ◽  
Vol 2004.1 (0) ◽  
pp. 195-196
Author(s):  
Akihiro HOJO ◽  
Akiyosi CHATANI ◽  
Hiroshi TACHIYA
Keyword(s):  
Dynamic Stress ◽  
Strain Curve ◽  
Bending Test ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Impact Bending

High Strain Rate Test of a Steel Plate under Blast Loading from High Explosive

2013 ◽  
Vol 767 ◽  
pp. 144-149 ◽  
Author(s):  
Tei Saburi ◽  
Shiro Kubota ◽  
Yuji Wada ◽  
Tatsuya Kumaki ◽  
Masatake Yoshida
Keyword(s):  
Strain Rate ◽  
Dynamic Stress ◽  
Steel Plate ◽  
High Strain ◽  
Strain Curve ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Time Deformation ◽  
Rate Test ◽  
High Strain Rate Test

In this study, a high strain rate test method of a steel plate under blast loading from high explosive was designed and was conducted by a combined experimental/numerical approach to facilitate the estimation process for the dynamic stress-strain curve under practical strain rate conditions. The steel plate was subjected to a blast load, which was generated by Composition C4 explosive and the dynamic deformation of the plate was observed with a high-speed video camera. Time-deformation relations were acquired by image analysis. A numerical simulation for the dynamic behaviors of the plate identical to the experimental condition was conducted using a coupling analysis of finite element method (FEM) and discrete particle method (DPM). Explosives were modeled by discrete particles and the steel plate and other materials were modeled by finite element. The blast load on the plate was described fluid-structure interaction (FSI) between DPM and FEM. As inverse analysis scheme to estimate dynamic stress-strain curve, an evaluation using a quasistatic data was conducted. In addition, two types of approximations for stress-strain curve were assumed and optimized by least square method. One is a 2-piece approximation, and was optimized by least squares method using a yield stress and a tangent modulus as parameters. The other is a continuous piecewise linear approximation, in which a stress-strain curve was divided into some segments based on experimental time-deformation relation, and was sequentially optimized using youngs modulus or yield stress as parameter. The results showed that the piecewise approximation can gives reasonably agreement with SS curve obtained from the experiment.

The Joule Effect

1940 ◽  
Vol 13 (1) ◽  
pp. 49-49
Author(s):  
W. B. Wiegand ◽  
J. W. Snyder
Keyword(s):  
Internal Energy ◽  
Dynamic Stress ◽  
Strain Curve ◽  
Heat Evolution ◽  
Point Of View ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Joule Effect ◽  
Steel Spring ◽  
Heat Transfers

Abstract With reference to a paper by Gleichentheil and Neumann on “The Gough-Joule Effect in Vulcanizates,” we should like to call attention to the similarity between the results reported in their paper and the earlier work reported by Wiegand and Snyder entitled “The Rubber Pendulum, the Joule Effect and the Dynamic Stress-Strain Curve.” The latter authors analyzed from a thermodynamic point of view the rubber stress-strain curve as affected by temperature. As a result of this analysis the stress-strain curve was divided into three groups, Region A, Region B and Region C. Each region was characterized by different trends as regards the Joule effect and internal energy changes. The following description is taken from the original paper: “Region A, The Steel Spring.—This region, extending to approximately 300 per cent elongation for the conditions in the experiments described, is characterized by the comparative absence of heat transfers . … little or no Joule effect.” “Region B, The Gas (and the Crystal).—In region B the region of the Joule effect . … there is the maximum of heat evolution. It should be noted that Region B extends from approximately 300 per cent elongation to 700 per cent elongation. “Region C, The Friction Member.—This region is characterized by the almost entire absence of reversible effects. The Joule effect has disappeared. There is no evolution of heat….“

scholarly journals The High Strain Rate Dynamic Stress-Strain Curve for OFHC Copper

2003 ◽  
Vol 52 (9Appendix) ◽  
pp. 187-195
Author(s):  
Michael. E. STEVENSON ◽  
Stanley. E. JONES ◽  
Richard. C. BRADT
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Dynamic Stress ◽  
High Strain ◽  
Strain Curve ◽  
Ofhc Copper ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Rate Dynamic
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