The influence of grain size and strain rate effects on formability of aluminium alloy sheet at high-speed forming

2018 ◽  
Vol 253 ◽  
pp. 134-159 ◽  
Author(s):  
Tung Chen Cheng ◽  
Rong Shean Lee
Keyword(s):  
Grain Size ◽  
Strain Rate ◽  
Aluminium Alloy ◽  
High Speed ◽  
Alloy Sheet ◽  
Strain Rate Effects ◽  
Rate Effects ◽  
High Speed Forming

scholarly journals Experimental analysis and modelling of dynamic deformation and failure behaviour of steel

2021 ◽  
Vol 250 ◽  
pp. 02020
Author(s):  
Chongyang Zeng ◽  
Xiangfan Fang
Keyword(s):  
Strain Rate ◽  
High Speed ◽  
Damage Mechanics ◽  
Fracture Behaviour ◽  
Image Correlation ◽  
Multiaxial Loading ◽  
Strain Rate Effects ◽  
Mechanics Model ◽  
Rate Effects ◽  
Loading Tests

New specimen geometries with various stress states are designed and applied for dynamic loading tests. Oscillation-free force is measured during multiaxial loading tests in the strain range of 10-4 – 103 s-1. The deformation and local strain fields of specimens have been measured using high-speed camera and evaluated by digital image correlation (DIC) techniques. It is found that the strain rate effects on fracture strain are stressstate dependent. To model the material plasticity and ductile fracture behaviour during dynamic tests, an extended damage mechanics model (eMBW model) is used. In this work, the model is enhanced and implemented into LS-DYNA. To cover the strain rate effects on plasticity at a large strain rate range, a modified Johnson–Cook-type rate-dependency and exponential temperature-dependency are used. In addition, the influences of both stress state and strain rate on fracture locus are considered. The enhanced damage mechanics model successfully predicts the deformation and fracture behaviour of the investigated steel under dynamic multiaxial loading.

Unusual grain-size and strain-rate effects on the serrated flow in FeMnC twin-induced plasticity steels

2012 ◽  
Vol 48 (4) ◽  
pp. 1669-1674 ◽  
Author(s):  
Lihe Qian ◽  
Pengcheng Guo ◽  
Jiangying Meng ◽  
Fucheng Zhang
Keyword(s):  
Grain Size ◽  
Strain Rate ◽  
Strain Rate Effects ◽  
Serrated Flow ◽  
Rate Effects
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