Microstructure transformation and stress-strain behavior of isotactic polypropylene under large plastic deformation

1997 ◽  
Vol 37 (10) ◽  
pp. 1702-1711 ◽  
Author(s):  
C. G'sell ◽  
V. Favier ◽  
J. M. Hiver ◽  
A. Dahoun ◽  
M. J. Philippe ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Isotactic Polypropylene ◽  
Large Plastic Deformation ◽  
Stress Strain ◽  
Strain Behavior ◽  
Microstructure Transformation

Thermal Elastic-Plastic Analysis Considering Temperature Rise by Rapid Plastic Deformation in Undermatched Joints

2009 ◽  
Vol 131 (3) ◽  
Author(s):  
Masahito Mochizuki ◽  
Gyu-Baek An ◽  
Masao Toyoda
Keyword(s):  
Plastic Deformation ◽  
Strain Rate ◽  
Temperature Rise ◽  
Structural Steels ◽  
Stress Strain ◽  
Elastic Plastic ◽  
Strain Behavior ◽  
Maximum Loading ◽  
Coupling Phenomena ◽  
Rapid Plastic Deformation

The characteristics of dynamic strength and fracture in structural steels and their welded joints particularly for pipelines should be evaluated based on the effects of the strain rate and service temperature. The temperature, however, rises so rapidly in structures due to the plastic work under the high strain rate such as ground sliding by earthquake when the effect of the temperature cannot be negligible for the dynamic fracture. It is difficult to predict or measure the temperature rise history with the corresponding stress-strain behavior, including the region beyond the uniform elongation, though the behavior at the large strain region after the maximum loading point is very important for the evaluation of fracture. In this paper, the coupling phenomena of the temperature and stress-strain fields under dynamic loading were simulated by using the finite element method. A modified rate-temperature parameter was defined by accounting for the effect of the temperature rise under rapid plastic deformation, and it was applied to the fully coupled analysis between the heat conduction and thermal elastic-plastic behavior. The temperature rise and stress-strain behavior, including the coupling phenomena, were studied including the region beyond the maximum loading point in structural steels and their undermatched joints, and then compared with the measured values.

scholarly journals Effect of Plastic Deformation on Compliance Curve Based Crack Closure Measurement

2016 ◽  
Vol 713 ◽  
pp. 240-243
Author(s):  
M.A. Mohin ◽  
Y.G. Xu ◽  
A. Lewis ◽  
A. Chrysanthou
Keyword(s):  
Plastic Deformation ◽  
Crack Growth ◽  
Crack Closure ◽  
Complex Loading ◽  
Stress Strain ◽  
Crack Growth Behaviour ◽  
Strain Behavior ◽  
Compliance Curve ◽  
Crack Tip Plasticity ◽  
Potential Issue

Fatigue crack growth depends heavily on near tip stress-strain behavior controlled by many micromechanical and microstructural factors. Crack closure is widely used to rationalize crack growth behaviour under complex loading conditions. Reliable crack closure measurement is essential for enhanced damage tolerance design and remains a challenge to the industry. This paper focuses on the effect of plastic deformation ahead of a notch/crack on the non-linearity of compliance curves of 6082-T651 aluminium alloy specimens to highlight a potential issue in the conventional compliance curve based crack closure measurement technique. Experimental and numerical simulation results demonstrate that plastic deformation ahead of the notch will introduce non-linear stress-strain behavior in the absence of crack closure. It is proposed that the effect of crack tip plasticity on the non-linearity of the compliance curve be separated to obtain reliable crack closure measurement.

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