Characterization of Stress Relaxation Behavior of Poscable-86 High-Strength Steel Wire

2021 ◽  
pp. 905-914
Author(s):  
Ngoc-Vinh Nguyen ◽  
Viet-Hung Truong
Keyword(s):  
Stress Relaxation ◽  
High Strength Steel ◽  
Steel Wire ◽  
High Strength ◽  
Relaxation Behavior ◽  
Stress Relaxation Behavior

scholarly journals Investigation on Stress Relaxation Behavior of High-Strength Steel Sheets Based on Elasto-viscoplasticity

2018 ◽  
Vol 1063 ◽  
pp. 012123
Author(s):  
M Takamura ◽  
K Murasawa ◽  
Y Kusuda ◽  
Y Suzuki ◽  
T Hakoyama ◽  
...  
Keyword(s):  
Stress Relaxation ◽  
High Strength Steel ◽  
High Strength ◽  
Relaxation Behavior ◽  
Stress Relaxation Behavior ◽  
Steel Sheets

Investigation on Effect of Slide Motion Control on Stamping of High Strength Steel Sheets

2013 ◽  
Vol 554-557 ◽  
pp. 1331-1337 ◽  
Author(s):  
Masato Takamura ◽  
Shigeru Nishimura ◽  
Hideyuki Sunaga
Keyword(s):  
Stress Relaxation ◽  
Motion Control ◽  
High Strength Steel ◽  
High Strength ◽  
Material Model ◽  
Relaxation Behavior ◽  
Stress Relaxation Behavior ◽  
Automotive Body ◽  
Steel Sheets ◽  
Servo Press

High strength steel sheets are increasingly used in automotive body parts with the aim of weight reduction, but their use urgently requires further improvement in sheet forming technology to overcome difficulties such as poor formability, dimensional inaccuracy, etc. On the other hand, servo press facilities are becoming increasingly used in industry and many attempts are being made to bring out their characteristic features for enhancing the formability of high strength steel sheets. Although some of these attempts have been successful in finding the advantages of servo presses for improving formability and dimensional accuracy, the mechanisms of such improvements have yet to be clarified in conjunction with the mechanical properties of the materials used. One of the most remarkable features of the servo press lies in its flexibility in slide motion control. It is thus effective to investigate the relevance of strain rate sensitivity of a material to the mechanism of improvement in formability enabled by the flexible slide motion of the servo press. However, very few studies have been carried out with material testing, material modeling, and numerical analyses combined with experimental verifications. In this study, Norton’s creep model was implemented in the FEM solver in order to take into account visco-elasto-plastic deformation including stress relaxation behavior. Parameters for the visco-elasto-plastic material model were identified through physical measurements and FEM simulations of uniaxial tension and crosshead displacement dwell tests, as shown in Fig. 1. The identified material model was applied to sheet forming simulations of an automotive body part and validity of the model was examined by comparing with stamping experiments using a servo press with a variety of slide motions. Numerical results with the identified material model showed the same tendency with respect to the slide motions as the experimental results. Stress relaxation behavior was found to be an important factor for improving formability enabled by modifying the slide motion.

Effect of Stress Relaxation on Springback of Steel Sheet in Warm Forming

2016 ◽  
Vol 725 ◽  
pp. 671-676 ◽  
Author(s):  
Naoko Saito ◽  
Mitsugi Fukahori ◽  
Daisuke Hisano ◽  
Hiroshi Hamasaki ◽  
Fusahito Yoshida
Keyword(s):  
Stress Relaxation ◽  
High Strength Steel ◽  
Room Temperature ◽  
Steel Sheet ◽  
Elevated Temperatures ◽  
High Strength ◽  
Warm Forming ◽  
Sheet Metals ◽  
Stress Relaxation Behavior ◽  
Increasing Temperature

Springback of a high strength steel (HSS) sheet of 980 MPa grade was investigated at elevated temperatures ranging from room temperature to 973 K. From U-and V-bending experiments it was found that springback was decreased with increasing temperature at temperatures of above 573 K. Furthermore, springback was decreased with punch-holding time because of stress relaxation. In this work, the stress relaxation behavior of the steel was experimentally measured. By using an elasto-vicoplasticity model, the stress relaxation was described, and its effect on the springback of sheet metals in warm forming was discussed theoretically.

Effects of accelerator type on stress relaxation behavior and network structure of aged natural rubber/chloroprene rubber vulcanizates

2016 ◽  
Vol 49 (5) ◽  
pp. 381-396 ◽  
Author(s):  
Farzad A Nobari Azar ◽  
Murat Şen
Keyword(s):  
Stress Relaxation ◽  
Natural Rubber ◽  
Network Structure ◽  
Structural Changes ◽  
Relaxation Behavior ◽  
Stress Relaxation Behavior ◽  
Rubber Blends ◽  
Chloroprene Rubber ◽  
Weather Changes ◽  
Behavior Network

Natural rubber/chloroprene rubber (NR/CR) blends are among the commonly used rubber blends in industry and continuously are exposed to severe weather changes. To investigate the effects of accelerator type on the network structure and stress relaxation of unaged and aged NR/CE vulcanizates, tetramethyl thiuram disulfide, 2-mercaptobenzothiazole, and diphenyl guanidine accelerators have been chosen to represent fast, moderate, and slow accelerator groups, respectively. Three batches have been prepared with exactly the same components and mixing conditions differing only in accelerator type. Temperatures scanning stress relaxation and pulse nuclear magnetic resonance techniques have been used to reveal the structural changes of differently accelerated rubber blends before and after weathering. Nonoxidative thermal decomposition analyses have been carried out using a thermogravimetric analyzer. Results indicate that there is a strong interdependence between accelerator type and stress relaxation behavior, network structure, cross-linking density, and aging behavior of the blends. Accelerator type also affects decomposition energy of the blends.

Stress relaxation behavior of eutectic tin-lead solder

1995 ◽  
Vol 24 (10) ◽  
pp. 1473-1484 ◽  
Author(s):  
E. W. Hare ◽  
R. G. Stang
Keyword(s):  
Stress Relaxation ◽  
Relaxation Behavior ◽  
Stress Relaxation Behavior
Sign in / Sign up

Export Citation Format

Share Document