Advances in computational dynamics for inelastic continua with anisotropic material behavior: Formulation and numerical implementation of inelastic ductile behavior of spruce wood

2020 ◽  
Vol 198 ◽  
pp. 41-56
Author(s):  
D. Supriatna ◽  
C. Steinke ◽  
M. Kaliske
Keyword(s):  
Anisotropic Material ◽  
Material Behavior ◽  
Numerical Implementation ◽  
Computational Dynamics ◽  
Spruce Wood ◽  
Ductile Behavior

Mid Thickness Delayed Cracking of Z-Quality Offshore Steel

2011 ◽  
Author(s):  
Stig Gra˚berg ◽  
Lars Volden ◽  
Anthonius Johannes Paauw
Keyword(s):  
Thick Plate ◽  
Phosphorus Content ◽  
Manganese Sulfide ◽  
Steel Structure ◽  
Casting Process ◽  
Tensile Specimen ◽  
Material Behavior ◽  
Centre Line ◽  
Delayed Cracking ◽  
Ductile Behavior

During fabrication of a steel structure for an offshore modification project, delayed cracking was experienced in the mid plane or centre line of a 30 mm thick plate. The plate was part of a restraint box frame where 25 mm plates were welded to this 30 mm plate on both plate-surfaces. The applied 30 mm plate was a higher strength offshore steel (EN10225-S420 G2+M), with special through thickness properties and enhanced chemical composition as defined in material data sheet MDS Y30 of NORSOK M-120. Fracture mechanical testing including KV and CTOD in the mid plane confirmed that a very low toughness was present here with a brittle fracture type (cleavage). The plate was manufactured by the continuous casting process which due to centre line segregation resulted in high levels of manganese sulfide inclusions but also niobium carbides/nitrides. The plate manufacturer considered the documented toughness level as expected. Similar testing was performed on a 30 mm plate also delivered to the same material specification but of which the material certificate revealed a 10 times lower sulfur and phosphorus content indicating a much higher steel refinement. A significant higher toughness was obtained for this steel with high ductile behavior. Both steels showed a similar through thickness ductility, measured elongation for the through thickness tensile specimen, which implies that this property does not guaranty for the observed material behavior.

Study of Anisotropic Material Behavior for Inconel 625 Alloy at Elevated Temperatures

2019 ◽  
Vol 18 ◽  
pp. 2760-2766 ◽  
Author(s):  
C.Anand Badrish ◽  
Nitin Kotkunde ◽  
Omkar Salunke ◽  
Swadesh Kumar Singh
Keyword(s):  
Anisotropic Material ◽  
Elevated Temperatures ◽  
Material Behavior ◽  
Inconel 625 ◽  
Inconel 625 Alloy

Anisotropy: Benefits for UOE Line Pipe

2012 ◽  
Author(s):  
Oliver Hilgert ◽  
Steffen Zimmermann ◽  
Christoph Kalwa
Keyword(s):  
Anisotropic Material ◽  
Isotropic Material ◽  
Three Dimensional ◽  
Structural Response ◽  
Bending Moment ◽  
Yield Function ◽  
Material Behavior ◽  
Load Case ◽  
Line Pipe ◽  
Anisotropic Plastic

Plastic anisotropic material behavior of UOE line pipe is investigated in view of its structural response. Common load cases are considered and their resultant strain capacity concerning Strain Based Design demands are discussed. Hill’s yield function is used to analyze steel line pipe under internal pressure and bending moment. Here, a three-dimensional anisotropic plastic strain evolution is considered. It was shown, that underlying anisotropic material behavior can be beneficial for the structural response of line pipe, although it depends on the load case and the directional anisotropy. That is in some way contrary to the demands in specifications, where isotropic material behavior is desired.

scholarly journals Retrospective Evaluation and Framework Development of Bone Anisotropic Material Behavior Compared with Elastic, Elastic-Plastic, and Hyper-Elastic Properties

2021 ◽  
Vol 9 (1) ◽  
pp. 9
Author(s):  
Farah Hamandi ◽  
James T. Tsatalis ◽  
Tarun Goswami
Keyword(s):  
Bone Tissue ◽  
Material Properties ◽  
Anisotropic Material ◽  
Material Behavior ◽  
Imaging Data ◽  
Premature Failure ◽  
Elastic Plastic ◽  
Significant Difference ◽  
Hyper Elastic

The main motivation for studying damage in bone tissue is to better understand how damage develops in the bone tissue and how it progresses. Such knowledge may help in the surgical aspects of joint replacement, fracture fixation or establishing the fracture tolerance of bones to prevent injury. Currently, there are no standards that create a realistic bone model with anisotropic material properties, although several protocols have been suggested. This study seeks to retrospectively evaluate the damage of bone tissue with respect to patient demography including age, gender, race, body mass index (BMI), height, and weight, and their role in causing fracture. Investigators believe that properties derived from CT imaging data to estimate the material properties of bone tissue provides more realistic models. Quantifying and associating damage with in vivo conditions will provide the required information to develop mathematical equations and procedures to predict the premature failure and potentially mitigate problems before they begin. Creating a realistic model for bone tissue can predict the premature failure(s), provide preliminary results before getting the surgery, and optimize the design of orthopaedic implants. A comparison was performed between the proposed model and previous efforts, where they used elastic, hyper- elastic, or elastic-plastic properties. Results showed that there was a significant difference between the anisotropic material properties of bone when compared with unrealistic previous methods. The results showed that the density is 50% higher in male subjects than female subjects. Additionally, the results showed that the density is 47.91% higher in Black subjects than Mixed subjects, 53.27% higher than Caucasian subjects and 57.41% higher than Asian. In general, race should be considered during modeling implants or suggesting therapeutic techniques.

Anisotropic Inverse Mechanics Identifies Regional Changes in Mechanical Anisotropy During Remodelling of Fibroblast-Populated Collagen Cruciforms

2011 ◽  
Author(s):  
Ramesh Raghupathy ◽  
Spencer P. Lake ◽  
Edward A. Sander ◽  
Colleen Witzenburg ◽  
Victor H. Barocas
Keyword(s):  
Anisotropic Material ◽  
Soft Tissues ◽  
Material Behavior ◽  
Mechanical Anisotropy ◽  
Tissue Samples ◽  
Intact Tissue ◽  
Tissue Equivalents ◽  
Standard Tests ◽  
Collagen Tissue

Most elastographic methods applied to soft tissues assume either isotropy or homogeneity in the sample. While this assumption is valid in specific cases, general methods that can identify regional changes in mechanical anisotropy have many advantages. Chiefly, such methods could quantify regional anisotropic material behavior on intact tissue samples especially when the tissue is heterogeneous and too small for standard tests. In this study we use an inverse mechanics method which handles both anisotropy and heterogeneity to track changes in mechanical anisotropy associated with remodeling in cell-compacted collagen tissue equivalents (TE), which are then compared with measurements from polarimetry to estimate the method’s accuracy.

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