Numerical and Experimental Study of Strain Rate Effects in Laser Forming

2000 ◽  
Vol 122 (3) ◽  
pp. 445-451 ◽  
Author(s):  
Wenchuan Li ◽  
Y. Lawrence Yao
Keyword(s):  
Strain Rate ◽  
Material Properties ◽  
Peak Temperature ◽  
Laser Forming ◽  
Temperature Dependent ◽  
Strain Rate Effects ◽  
Temperature Method ◽  
Rate Effects ◽  
Forming Efficiency ◽  
Simulation Results

Experimental investigation and numerical simulation of the influence of the strain rate in laser forming are presented. To isolate and effectively study the strain rate effects, which are temperature dependent, a “constant peak temperature” method is developed with the aid of numerical modeling and solution. Under the condition of the constant peak temperature, the effects of strain rate on forming efficiency, residual stress and hardness of the formed parts are studied both experimentally and numerically. In the numerical model, the temperature dependence and strain-rate dependence of the flow stress and other material properties are considered. The simulation results are consistent with the experimental observations. [S1087-1357(00)01004-2]

scholarly journals Characterization of strain rate effects in sheet laser forming

2018 ◽  
Vol 346 (8) ◽  
pp. 794-805 ◽  
Author(s):  
Javier I. Castillo ◽  
Diego J. Celentano ◽  
Marcela A. Cruchaga ◽  
Claudio M. García-Herrera
Keyword(s):  
Strain Rate ◽  
Laser Forming ◽  
Strain Rate Effects ◽  
Rate Effects

Inclusion of Strain-Rate Effects in Low Velocity Impact Simulation of Laminated Composites

2013 ◽  
Vol 465-466 ◽  
pp. 1395-1399
Author(s):  
Ainullotfi Abdul-Latif ◽  
Mohd Hasrizam Che Man ◽  
S. Mansor
Keyword(s):  
Strain Rate ◽  
Material Properties ◽  
Reaction Force ◽  
Low Velocity Impact ◽  
Static Properties ◽  
Low Velocity ◽  
Element Analysis ◽  
Strain Rate Effects ◽  
Velocity Impact ◽  
Rate Effects

Composite materials are widely used in aircraft, automotive, marine and railway applications and are exposed to impact loads, in particular low velocity impact. As material properties of composites are affected by strain-rate [, finite element analysis (FEA) by using static properties would not predict their impact behaviour accurately. Thus, the objective of this study was to include strain-rate effects in the simulation of composite laminates under low velocity impact. This was achieved using ABAQUS anisotropic damage model (ADM) by taking account of material properties changes as a function of log strain-rate using user-defined ABAQUS/VUSDFLD subroutine Strain-Rate Dependent ADM (SRD ADM). Results obtained from SRD ADM were validated using simple tensile test done by Okoli [. Subsequently a three-point bending impact event of a simple composite laminate beam by a cylindrical steel impactor was simulated using both the original ABAQUS Static ADM and the user-defined SRD ADM, and compared with experimental impact test results done by [. The results show that reductions in errors of predicted maximum impact reaction force (compared to experimental data) were achieved from 29% using Static ADM to 14% using SRD ADM and from 35% using Static ADM to 15% using SRD ADM respectively for impactor speeds of 2 ms-1 and 5 ms-1.

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