A physically based visco-hyperelastic constitutive model for soft materials

2019 ◽  
Vol 128 ◽  
pp. 208-218 ◽  
Author(s):  
Yuhai Xiang ◽  
Danming Zhong ◽  
Peng Wang ◽  
Tenghao Yin ◽  
Haofei Zhou ◽  
...  
Keyword(s):  
Constitutive Model ◽  
Soft Materials ◽  
Physically Based

Predictions of ICHAZ Cyclic Thermomechanical Response in GTAW Process for 9Cr Steels

2019 ◽  
Vol 141 (2) ◽  
Author(s):  
Padraig Mac Ardghail ◽  
Richard A. Barrett ◽  
Noel Harrison ◽  
Sean B. Leen
Keyword(s):  
Constitutive Model ◽  
Heat Affected Zone ◽  
Volume Fraction ◽  
Cyclic Performance ◽  
Modeling Framework ◽  
Thermomechanical Response ◽  
Welding Simulation ◽  
Physically Based ◽  
Gtaw Process

This work is concerned with the development of a modeling framework to predict the effects of tempered–untempered martensite heterogeneity on the thermomechanical performance of welded material. A physically based viscoplasticity model for the intercritical heat-affected zone (ICHAZ) for 9Cr steels (e.g., P91, P92) is presented in this work, with the ICHAZ represented as a mixture of tempered and untempered martensite. The constitutive model includes dislocation-based Taylor hardening and damage for different material phases. A sequentially coupled thermal–mechanical welding simulation is conducted to predict the volume fraction compositions for the various weld-affected material zones in a cross-weld (CW) specimen. The out-of-phase cyclic thermomechanical (25 °C to 600 °C) performance of notched and plain samples is comparatively assessed for a range of different tempered–untempered martensitic material heterogeneities. It is shown that the heterogeneity in a simulated CW material is highly detrimental to thermal cyclic performance.

A physically-based constitutive model for hot deformation of Ti-10-2-3 alloy

2017 ◽  
Vol 696 ◽  
pp. 295-303 ◽  
Author(s):  
Ravindranadh Bobbili ◽  
B. Venkata Ramudu ◽  
Vemuri Madhu
Keyword(s):  
Constitutive Model ◽  
Hot Deformation ◽  
Physically Based

scholarly journals Development of a constitutive model for DPX2 explosive

2018 ◽  
Vol 183 ◽  
pp. 01059
Author(s):  
Philip Church ◽  
Peter Gould ◽  
David Williamson
Keyword(s):  
Constitutive Model ◽  
Impact Loading ◽  
Split Hopkinson Pressure Bar ◽  
Model Development ◽  
Tensile Tests ◽  
High Rate ◽  
Hopkinson Pressure Bar ◽  
Static Compression ◽  
Physically Based ◽  
Stress States

There is a significant challenge in simulating the behaviour of PBXs under high strain rate impact loading. A Porter-Gould physically based constitutive model has been developed for the DPX2 explosive. A series of quasi-static compression and tensile tests over a range of temperatures were performed together with DMA tests to calibrate the model. In particular tests were performed for different L/D ratios to understand the complex localisation and damage behaviour of the material. High rate tests on the compression Split Hopkinson Pressure Bar (SHPB) for a range of temperatures were then used for validation of the model under idealised stress states. Some model development is still required, particularly at lower temperatures near the glass transition temperature. In addition a series of classical Taylor Tests were used to validate the model under impact loading conditions at room temperature. The DYNA3D simulations gave very good results compared to the experiments for these impact conditions.

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