scholarly journals Computationally-efficient Non-linear kinematic Models to Predict Multiaxial Stress-strain Behavior under Variable Amplitude Loading

2015 ◽  
Vol 101 ◽  
pp. 285-292 ◽  
Author(s):  
Marco Antonio Meggiolaro ◽  
Jaime Tupiassú Pinho de Castro ◽  
Hao Wu
Keyword(s):  
Multiaxial Stress ◽  
Computationally Efficient ◽  
Stress Strain ◽  
Variable Amplitude Loading ◽  
Variable Amplitude ◽  
Strain Behavior ◽  
Non Linear ◽  
Kinematic Models

Evaluation of Sealing Performance of Pipe Flange Connection Subjected to External Bending Moments

2009 ◽  
Author(s):  
Yoshio Takagi ◽  
Hiroyasu Torii ◽  
Toshiyuki Sawa ◽  
Kensuke Funada
Keyword(s):  
Bending Moment ◽  
Bending Moments ◽  
Stress Strain ◽  
Flange Connection ◽  
Strain Behavior ◽  
Leakage Test ◽  
Bolt Preload ◽  
Sealing Performance ◽  
Non Linear

The sealing performance of pipe flange connection subjected to an external bending moment was evaluated with the FEM and the experiments. The experimental leakage test using water revealed that the bending moment had an important effect on the sealing performance. The FE analyses suggested that the contact gasket stress, which was a function of the bolt preload, determines the leakage. The changes in contact gasket stress at tension side and compression side when the external bending moment applied were not symmetrical. The reduction in the contact gasket stress of tension side was larger than that of compression side due to the non-linear stress-strain behavior of the gasket. In addition, the hub stress of the flange when external bending moment applied, was evaluated from FE result and the discussion for optimizing the flange design subjected to external bending moment was done in this paper.

Analysis of Hysteresis Loop on the Basis of Variable-Amplitude Loading

2016 ◽  
Vol 250 ◽  
pp. 94-99
Author(s):  
Bogdan Ligaj
Keyword(s):  
Plastic Strain ◽  
Hysteresis Loop ◽  
Strain Energy ◽  
Energy Parameter ◽  
Stress Strain ◽  
Variable Amplitude Loading ◽  
Loading Cycle ◽  
Variable Amplitude ◽  
Plastic Strain Energy

The aim of this paper is to present a method to be used for analysis of stress-strain loops under variable amplitude loading. The method for determination of plastic strain energy parameter ΔWpl consists in determination of envelopes around stress-strain branches (increasing and decreasing) formed in effect of application of a loading program. The method involves development of envelopes to determine energy parameter from the highest (for the highest loading cycle) to the lowest (for the lowest cycle). The paper includes results of stress-strain loop for steel C45.

scholarly journals Investigation of tensile properties of RTV Silicone based Isotropic Magnetorheological Elastomers.

2018 ◽  
Vol 144 ◽  
pp. 02015 ◽  
Author(s):  
Bhaktha Sandesh ◽  
Hegde Sriharsha ◽  
U. Rao Sathish ◽  
Gandhi Nikhil
Keyword(s):  
Magnetic Field ◽  
Mechanical Properties ◽  
Tensile Properties ◽  
Tensile Modulus ◽  
Stress Strain ◽  
Percentage Elongation ◽  
Strain Behavior ◽  
Non Linear ◽  
Ferro Magnetic ◽  
Hyperelastic Model

Magnetorheological elastomer (MRE) consists of an elastomer matrix and a Ferro-magnetic ingredient. The mechanical properties of MR elastomers can be reversibly controlled by applying a magnetic field of suitable intensity. The current work focusses on the enhancement of tensile property of RTV (Room Temperature Vulcanization) silicone based elastomer. The influence of Carbonyl iron powder (CIP) content and magnetic field were experimentally investigated. Addition of CIP increases the tensile modulus but it reduces the percentage elongation and tensile strength making it brittle. Under the influence of magnetic field, the enhancement of tensile properties up to 20% content was linear. The behavior above 20% is observed to be non-linear. The onset of non-linear stress-strain behavior is investigated. Regression equation is developed from the experimental data relating percentage content with the mechanical properties of MRE. The developed equation predicted the behavior of 27% MRE with an error of less than 8%. Hyperelastic model developed by Yeoh was fitted to the stress-strain behavior of MRE with minimal error.

scholarly journals Integral treatment of butt joints for the fatigue life assessment in the low cycle fatigue regime

2020 ◽  
Author(s):  
Benjamin Möller
Keyword(s):  
Fatigue Life ◽  
Life Assessment ◽  
Cyclic Behavior ◽  
Cycle Fatigue ◽  
Stress Strain ◽  
Butt Joints ◽  
Variable Amplitude Loading ◽  
Fatigue Assessment ◽  
Variable Amplitude ◽  
Integral Treatment

Abstract The framework for a fatigue assessment of welded joints under service loading conditions of crane structures from the low cycle to the high cycle fatigue regime includes the consideration of elastic-plastic material behavior, variable amplitude loading, and acceptable calculation times. Therefore, an integral treatment of butt joints has been developed for fatigue life estimation. The butt weld is considered in its entirety, so that it can be described by its cyclic behavior. The evaluation of the cyclic stress-strain behavior and tri-linear strain-life curves of butt joints for different high-strength, fine-grained structural steels, derived by strain-controlled fatigue tests, is the basis for this description. This procedure is not limited to conventionally applied gas metal arc welding only, but also the fatigue assessment of laser beam welding is possible, for example. Cyclic transient effects have been analyzed and a distinctive cyclic softening is described by linearization of Ramberg-Osgood parameters, depending on the damage content of each cycle derived from constant amplitude, strain-controlled tests. On the basis of the cyclic behavior in combination with memory and Masing behavior, a simulation of the stress-strain paths of investigated butt welds, under constant and variable amplitude loading, has been performed. Damage parameters are used to accumulate the damage cycle by cycle in order to derive the fatigue lifetime. Finally, calculated fatigue lives were compared with experimentally determined lives, showing the impact of this procedure.

scholarly journals Study of the non-linear stress-strain behavior in Ti-Nb-Zr alloys

2005 ◽  
Vol 8 (4) ◽  
pp. 435-438 ◽  
Author(s):  
Sergio Schneider ◽  
Sandra Giacomin Schneider ◽  
Helena Marques da Silva ◽  
Carlos de Moura Neto
Keyword(s):  
Stress Strain ◽  
Strain Behavior ◽  
Non Linear ◽  
Zr Alloys

Unified Approach for Notch Stress Strain Conversion (NSSC) Rules

2012 ◽  
Author(s):  
R. Adibi-Asl ◽  
R. Seshadri
Keyword(s):  
Interpolation Method ◽  
Notch Root ◽  
Three Dimensional ◽  
Linear Interpolation ◽  
Unified Approach ◽  
Stress Strain ◽  
Elastic Plastic ◽  
Strain Behavior ◽  
Notch Stress ◽  
Non Linear

There are several simplified methods, known as notch stress-strain conversion (NSSC) rules that provide an approximate formula to relate local elastic-plastic stresses and strains at the notch root to those estimated elastically. This paper investigates a unified approach that estimates non-linear and history dependent stress-strain behavior of the notches using the conventional NSSC rules. A non-linear interpolation method is adapted to estimate the elastic-plastic stress and strain at notches. A comparison is made between the finite element results for several notch configurations (with and without three dimensional effects) and those obtained from NSSC rules and the proposed formulation.

scholarly journals Micromechanical modeling of non-linear stress-strain behavior of polycrystalline microcracked materials under tension

2019 ◽  
Vol 164 ◽  
pp. 50-59 ◽  
Author(s):  
Giovanni Bruno ◽  
Mark Kachanov ◽  
Igor Sevostianov ◽  
Amit Shyam
Keyword(s):  
Micromechanical Modeling ◽  
Stress Strain ◽  
Strain Behavior ◽  
Non Linear
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