Determination of Steady Ratcheting Strain Rate Under Biaxial Loading Based on Cycle Nonproportionality Coefficient

2017 ◽  
Vol 49 (2) ◽  
pp. 250-255 ◽  
Author(s):  
M. P. Adamchuk ◽  
M. V. Borodii
Keyword(s):  
Strain Rate ◽  
Biaxial Loading ◽  
Ratcheting Strain

Formability of Explosive Welded Mg/Al Bimetallic Bar

2016 ◽  
Vol 716 ◽  
pp. 114-120 ◽  
Author(s):  
Sebastian Mróz ◽  
Piotr Szota ◽  
Teresa Bajor ◽  
Andrzej Stefanik
Keyword(s):  
Plastic Deformation ◽  
Strain Rate ◽  
Process Parameters ◽  
Metal Forming ◽  
Explosive Welding ◽  
Physical Modelling ◽  
Main Process ◽  
Compression Tests ◽  
Welding Method

The paper presents the results of physical modelling of the plastic deformation of the Mg/Al bimetallic specimens using the Gleeble 3800 simulator. The plastic deformation of Mg/Al bimetal specimens characterized by the diameter to thickness ratio equal to 1 was tested in compression tests. The aim of this work was determination of the range of parameters as temperature and strain rate that mainly influence on the plastic deformation of Mg/Al bars during metal forming processes. The tests were carried out for temperature range from 300 to 400°C for different strain rate values. The stock was round 22.5 mm-diameter with an Al layer share of 28% Mg/Al bars that had been produced using the explosive welding method. Based on the analysis of the obtained testing results it has been found that one of the main process parameters influencing the plastic deformation the bimetal components is the initial stock temperature and strain rate values.

Determination of Strain Rate Depended Stress and Strain Fields in PVD Coatings on Cemented Carbide Inserts during the Repetitive Impact Test

2020 ◽  
Vol 404 ◽  
pp. 45-52
Author(s):  
Antonios Bouzakis ◽  
Georgios Skordaris ◽  
Konstantinos Dionysios Bouzakis ◽  
Mehmet Gökhan Gökcen ◽  
Apostolos Boumpakis ◽  
...  
Keyword(s):  
Strain Rate ◽  
Cemented Carbide ◽  
Stress And Strain ◽  
Strain Fields ◽  
Rate Dependent ◽  
Impact Forces ◽  
Repetitive Impact ◽  
Carbide Inserts ◽  
Fatigue Endurance

Recently, stress, strain, strain-rate dependent curves for cemented carbide have become an established tool for evaluating the mechanical properties. In this paper, related strain-rate dependent data of a K05 insert were employed to define the developed stress and strain fields occurring in the compound coating-substrate at impact forces of various durations. In this way, the occurring maximum strains at various impact loads and times were analytically calculated. These maximum values and related fatigue endurance coating strain-rate dependent limits were consequently used to validate published coating fatigue critical impact forces associated with certain impact times.

Determination of shear behavior and constitutive modeling of the 603 steel over wide temperature and strain rate ranges

2019 ◽  
Vol 129 ◽  
pp. 184-204 ◽  
Author(s):  
Zejian Xu ◽  
Yu Liu ◽  
Hongzhi Hu ◽  
Xiaodong He ◽  
Fenglei Huang
Keyword(s):  
Strain Rate ◽  
Constitutive Modeling ◽  
Shear Behavior

Determination of Instability in Zr-2.5Nb-0.5Cu Using Lyapunov Function

2015 ◽  
Vol 830-831 ◽  
pp. 329-332 ◽  
Author(s):  
Kuldeep Kumar Saxena ◽  
Vivek Pancholi ◽  
Dinesh Srivastava ◽  
G.K. Dey ◽  
Sanjay K. Jha ◽  
...  
Keyword(s):  
Lyapunov Function ◽  
Strain Rate ◽  
Flow Instability ◽  
Peak Stress ◽  
Strain Rate Range ◽  
Rate Of Change ◽  
Deformation Condition ◽  
Hot Workability ◽  
Lower Temperature

Hot workability of Zr-2.5Nb-0.5Cu alloy has been investigated by means of hot compression test using Gleeble-3800®, in the temperature and strain rate range of 700 to 925°C and 0.01-10s-1, respectively. Deformation behavior was characterized in terms of flow instability using peak stress with the help of Lyapunov Function. The true stress-strain curves shows that softening occurs at all lower temperature and for entire strain rates of deformation. The instable flow was suggested by negative m value at deformation condition of 700°C (5 and 10 s-1), while s value at 925°C (10 s-1). The combined result of rate of change of m and s with respect to log strain rate suggest that the deformation condition ranges from 725-780°C (10-2- 10-1 s-1) and 700°C (1-10 s-1) representing safe domain for stable flow.

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