scholarly journals Effect of friction history of workpiece on friction behaviour in metal forming

2019 ◽  
Vol 544 ◽  
pp. 012024 ◽  
Author(s):  
Z G Wang ◽  
Y Kozakai
Keyword(s):  
Metal Forming ◽  
History Of ◽  
Friction Behaviour

scholarly journals R-HPDC in South Africa

2012 ◽  
Vol 192-193 ◽  
pp. 3-15 ◽  
Author(s):  
Ulyate Andries Curle ◽  
Heinrich Möller ◽  
Gonasagren Govender
Keyword(s):  
South Africa ◽  
Metal Forming ◽  
Solid Metal ◽  
Matrix Composites ◽  
Purity Aluminium ◽  
Binary Eutectic ◽  
History Of ◽  
High Purity Aluminium ◽  
Semi Solid ◽  
Pressure Die Casting

The history of semi-solid metal forming and in particular rheo-high pressure die casting at the Council for Scientific and Industrial Research in South Africa is discussed. Processing flexibility is demonstrated on the Al-Si-Mg, Al-Mg-Si, Al-Cu-Mg and Al-Zn-Mg-Cu casting and wrought alloy systems as well as on high purity aluminium, unmodified Al-Si binary eutectic, metal matrix composites and magnesium alloys. Material properties are highlighted.

scholarly journals THE INFLUENCE OF RATE OF DAMAGE ACCUMULATION IS USED IN THE CALCULATION OF DUCTILITY RESOURCE

2019 ◽  
pp. 5-11
Author(s):  
Iryna Derevenko ◽  
Olena Solona
Keyword(s):  
Stress State ◽  
Metal Forming ◽  
Damage Accumulation ◽  
Accumulation Rate ◽  
Complex Loading ◽  
First Derivative ◽  
Marginal Change ◽  
History Of ◽  
Derivatives Of ◽  
Scalar Integral

In assessing marginal change in the process of metal forming, plasticity is significantly affected by the rate of damage accumulation and their healing as derivatives of the stress state indicators. It is shown that under complex loading conditions, when the damage accumulation rate (the first derivative of the stress state indicators) is more than 5 and the curvature of the material deformation trajectories (the second derivative of the stress state indicators) is greater than 1, the scalar integral criteria give the most reliable results destruction, taking into account the influence of the history of deformation on plasticity.

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