scholarly journals Plastic heterogeneities of a copper multicrystal deformed in uniaxial tension: experimental study and finite element simulations

2000 ◽  
Vol 48 (5) ◽  
pp. 1075-1087 ◽  
Author(s):  
F. Delaire ◽  
J.L. Raphanel ◽  
C. Rey
Keyword(s):  
Experimental Study ◽  
Finite Element ◽  
Uniaxial Tension ◽  
Finite Element Simulations

scholarly journals Effect of compaction roller on layup quality and defects formation in automated fiber placement

2019 ◽  
Vol 39 (1-2) ◽  
pp. 3-20 ◽  
Author(s):  
Nima Bakhshi ◽  
Mehdi Hojjati
Keyword(s):  
Experimental Study ◽  
Finite Element ◽  
Pressure Distribution ◽  
Finite Element Simulations ◽  
Process Conditions ◽  
Fiber Placement ◽  
Static Testing ◽  
Contact Width ◽  
Automated Fiber Placement

Application of automated fiber placement is limited by defects formed in the prepreg tows during the layup process. An extensive experimental study is performed to investigate the effect of compaction roller on the quality of the layup. Five different compaction rollers with different stiffness and architectures were manufactured and employed to dispense prepreg tows at various process conditions. Layup quality was examined and different defects including tow buckling and blister were identified. In addition to automated fiber placement trials, static testing and finite element simulations were performed to probe the pressure distribution and contact width of each roller. This data was used to support and understand the results of the automated fiber placement trials. Results indicate the solid elastomer rollers that are compliant enough to produce the same level of contact width under similar levels of compaction forces are superior to the perforated rollers in terms of achievable layup quality.

scholarly journals Billet Straightening by Three-Point Bending and Its Automation

Materials ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 90
Author(s):  
Radim Halama ◽  
Jan Sikora ◽  
Martin Fusek ◽  
Jaromír Mec ◽  
Jana Bartecká ◽  
...  
Keyword(s):  
Experimental Study ◽  
Finite Element ◽  
Finite Element Simulations ◽  
Parameters Estimation ◽  
Three Point Bending ◽  
Material Parameters ◽  
New Material ◽  
Basic Ideas

This paper presents the current results of cooperation focused on automatic billet straightening machine development. First, an experimental study of three-point bending realized on small specimens is presented to explain the basic ideas of the straightening. Then, the main regimes of straightening and the algorithm itself are described together. Subsequent finite element simulations of operational experiments show the applicability of the developed theory. The significance of material parameters estimation is depicted in this work. At least four parameters have to be properly determined for a new material in the straightening process.

Thermomechanical finite element simulations of ultrasonically assisted turning

2005 ◽  
Vol 32 (3-4) ◽  
pp. 463-471 ◽  
Author(s):  
A.V. Mitrofanov ◽  
V.I. Babitsky ◽  
V.V. Silberschmidt
Keyword(s):  
Finite Element ◽  
Finite Element Simulations
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