scholarly journals Computational Modeling of Microstructure and Numerical Analysis of Stress-Strain States of Cast Iron with Vermicular Graphite Shape

2016 ◽  
Vol 136 ◽  
pp. 33-37
Author(s):  
Radka Bezdedová ◽  
Petra Kováčiková ◽  
Ján Vavro ◽  
Ján Vavro
Keyword(s):  
Cast Iron ◽  
Numerical Analysis ◽  
Computational Modeling ◽  
Stress Strain

Experimental and Numerical Analysis of Stress-Strain Field of the Modelled Boiler Element

2020 ◽  
pp. 257-273
Author(s):  
Milena Rajić ◽  
Dragoljub Živković ◽  
Milan Banić ◽  
Marko Mančić ◽  
Miloš Milošević ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Strain Field ◽  
Stress Strain

A machine learning based approach for determining the stress-strain relation of grey cast iron from nanoindentation

2020 ◽  
Vol 148 ◽  
pp. 103522
Author(s):  
Jian Weng ◽  
Rebecka Lindvall ◽  
Kejia Zhuang ◽  
Jan-Eric Ståhl ◽  
Han Ding ◽  
...  
Keyword(s):  
Machine Learning ◽  
Cast Iron ◽  
Grey Cast Iron ◽  
Stress Strain ◽  
Strain Relation ◽  
Stress Strain Relation ◽  
Grey Cast

scholarly journals Effects of layer shift and yarn path variability on mechanical properties of a twill weave composite

2016 ◽  
Vol 51 (7) ◽  
pp. 913-925 ◽  
Author(s):  
MY Matveev ◽  
AC Long ◽  
LP Brown ◽  
IA Jones
Keyword(s):  
Numerical Analysis ◽  
Strain Curve ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Element Analysis ◽  
Damage Propagation ◽  
Macro Scale ◽  
Twill Weave ◽  
Modulus Reduction ◽  
Good Agreement

Experimental and numerical analyses of a woven composite were performed in order to assess the effect of yarn path and layer shift variability on properties of the composite. Analysis of the geometry of a 12 K carbon fibre 2 × 2 twill weave at the meso- and macro-scales showed the prevalence of the yarn path variations at the macro-scale over the meso-scale variations. Numerical analysis of yarn path variability showed that it is responsible for a Young’s modulus reduction of 0.5% and CoV of 1% which makes this type of variability in the selected reinforcement almost insignificant for an elastic analysis. Finite element analysis of damage propagation in laminates with layer shift showed good agreement with the experiments. Both numerical analysis and experiments showed that layer shift has a strong effect on the shape of the stress–strain curve. In particular, laminates with no layer shift tend to exhibit a kink in the stress–strain curve which was attributed solely to the layer configuration.

Development of a Flow Evolution Network Model for the Stress–Strain Behavior of Poly(L-lactide)

2017 ◽  
Vol 139 (9) ◽  
Author(s):  
Maureen L. Dreher ◽  
Srinidhi Nagaraja ◽  
Jorgen Bergstrom ◽  
Danika Hayman
Keyword(s):  
Finite Element ◽  
Constitutive Model ◽  
Computational Modeling ◽  
Medical Devices ◽  
Constitutive Models ◽  
Constitutive Relationship ◽  
Displacement Curve ◽  
Stress Strain ◽  
Strain Behavior ◽  
Flow Evolution

Computational modeling is critical to medical device development and has grown in its utility for predicting device performance. Additionally, there is an increasing trend to use absorbable polymers for the manufacturing of medical devices. However, computational modeling of absorbable devices is hampered by a lack of appropriate constitutive models that capture their viscoelasticity and postyield behavior. The objective of this study was to develop a constitutive model that incorporated viscoplasticity for a common medical absorbable polymer. Microtensile bars of poly(L-lactide) (PLLA) were studied experimentally to evaluate their monotonic, cyclic, unloading, and relaxation behavior as well as rate dependencies under physiological conditions. The data were then fit to a viscoplastic flow evolution network (FEN) constitutive model. PLLA exhibited rate-dependent stress–strain behavior with significant postyield softening and stress relaxation. The FEN model was able to capture these relevant mechanical behaviors well with high accuracy. In addition, the suitability of the FEN model for predicting the stress–strain behavior of PLLA medical devices was investigated using finite element (FE) simulations of nonstandard geometries. The nonstandard geometries chosen were representative of generic PLLA cardiovascular stent subunits. These finite element simulations demonstrated that modeling PLLA using the FEN constitutive relationship accurately reproduced the specimen’s force–displacement curve, and therefore, is a suitable relationship to use when simulating stress distribution in PLLA medical devices. This study demonstrates the utility of an advanced constitutive model that incorporates viscoplasticity for simulating PLLA mechanical behavior.

Stress/strain behaviour and fatigue limit of grey cast iron

2005 ◽  
Vol 413-414 ◽  
pp. 578-582 ◽  
Author(s):  
Th. Willidal ◽  
W. Bauer ◽  
P. Schumacher
Keyword(s):  
Cast Iron ◽  
Fatigue Limit ◽  
Grey Cast Iron ◽  
Stress Strain ◽  
Strain Behaviour ◽  
Grey Cast
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