scholarly journals Identification of Material Constants in Constitutive Equation by Indentation Test with Different Indenters.

2002 ◽  
Vol 51 (6) ◽  
pp. 681-687 ◽  
Author(s):  
Takashi WAKUI ◽  
Masatoshi FUTAKAWA ◽  
Yuji TANABE ◽  
Ikuo IOKA
Keyword(s):  
Constitutive Equation ◽  
Indentation Test ◽  
Material Constants

Establishment of an ANSYS-Based Constitutive Modeling for Age Forming of Aluminum Alloy

2012 ◽  
Vol 217-219 ◽  
pp. 1497-1500 ◽  
Author(s):  
Xiao Jun Zuo ◽  
Jun Chu Li ◽  
Da Hai Liu ◽  
Long Fei Zeng
Keyword(s):  
Aluminum Alloy ◽  
Constitutive Equation ◽  
Material Model ◽  
Tensile Tests ◽  
Material Constants ◽  
Tensile Process ◽  
Simulation Based ◽  
Optimal Material ◽  
Two Stages ◽  
Good Agreement

Constructing accurate constitutive equation from the optimal material constants is the basis for finite element numerical simulation. To accurately describe the creep ageing behavior of 2A12 aluminum alloy, the present work is tentatively to construct an elastic-plastic constitutive model for simulation based on the ANSYS environment. A time hardening model including two stages of primary and steady-state is physically derived firstly, and then determined by electronic creep tensile tests. The material constants within the creep constitutive equations are obtained. Furthermore, to verify the feasibility of the material model, the ANSYS based numerical scheme is established to simulate the creep tensile process by using the proposed material model. Results show that the creep constitutive equation can better describe the deformation characteristics of materials, and the numerical simulations and experimental test points are in good agreement.

The Sequential Analysis of Film Deformation Behavior during Successive Biaxial Stretching Process

2013 ◽  
Vol 747 ◽  
pp. 611-614 ◽  
Author(s):  
Yoshiyuki Kushizaki ◽  
Masayoshi Tokihisa ◽  
Hideki Tomiyama ◽  
Toshiro Yamada
Keyword(s):  
Constitutive Equation ◽  
Deformation Behavior ◽  
Draw Ratio ◽  
Sequential Analysis ◽  
Machine Direction ◽  
Material Constants ◽  
Biaxial Stretching ◽  
Experimental Deformation ◽  
Stretching Ratio ◽  
Stretching Process

The deformation behavior of Polypropylene (PP) film during successive biaxial stretching process which consists of machine direction (MD) stretching process with a roll drawing and transverse direction (TD) stretching with a tentering was analyzed sequentially by using a finite element method (FEM). In order to analyze it, stress-strain curves of casted PP film and uni-axially oriented PP film in MD were measured and fitted into the constitutive equation that the authors developed previously, respectively, and then, material constants for both films were obtained. Deformation behavior during successive biaxial stretching were calculated by applying the constitutive equation with the material constants of casted PP film for MD stretching and uni-axially oriented PP film in MD for TD stretching, respectively. Analytical conditions were the draw ratio of 5 for MD analysis and the stretching ratio of 9.5 for TD analysis. The authors also experimentally measured the thickness of film during and after MD and TD stretching using a pilot plant under the same conditions as analytical condition. Calculated results were able to express qualitatively the experimental deformation behavior of PP film such as the neck-in phenomena during MD stretching and the change of film thickness during MD and TD stretching.

J0410302 On Estimation of Creep Constitutive Equation by Indentation Test

2014 ◽  
Vol 2014 (0) ◽  
pp. _J0410302--_J0410302-
Author(s):  
Takahiro Ishikawa ◽  
Masayuki Arai ◽  
Yukio Takahashi ◽  
Tomohisa Kumagai
Keyword(s):  
Constitutive Equation ◽  
Indentation Test

Non-linearly viscoelastic constitutive equation of cancellous bone tissue and identification of material constants

2018 ◽  
Vol 23 (1) ◽  
pp. 12-17
Author(s):  
Marek Pawlikowski ◽  
Grzegorz Kokot ◽  
Konstanty Skalski ◽  
Krzysztof Jankowski ◽  
Anna Makuch
Keyword(s):  
Constitutive Equation ◽  
Bone Tissue ◽  
Cancellous Bone ◽  
Strain Energy Function ◽  
Least Square ◽  
Elastic Response ◽  
Compression Tests ◽  
Material Constants ◽  
Marquardt Algorithm ◽  
Human Cancellous Bone

In the paper a new constitutive equation for human cancellous bone tissue was formulated. A strain energy function was postulate, which describes the elastic response of the tissue to the load. The nonlinear viscoelasticity was also taken into account in the constitutive model. The material constants in the constitutive equation were identified on the basis of the results of stress relaxation tests and monotonic compression tests using the curve fitting method. The Levenberg-Marquardt algorithm of the least square method was used here. On the basis of the relaxation tests, the values of relaxation times were identified, while the elastic and viscoelastic constants were determined on the basis of monotonic compression tests. The tests were performed at room temperature. On the cuboidal samples of cancellous bone obtained from femoral heads during the surgeries of hip joint prosthesis implantation.

scholarly journals Estimation of creep constitutive equation by creep indentation test using cylindrical indenter

2020 ◽  
Vol 7 (4) ◽  
pp. 20-00232-20-00232
Author(s):  
Tomomichi DOI ◽  
Masayuki ARAI ◽  
Kiyohiro ITO
Keyword(s):  
Constitutive Equation ◽  
Indentation Test
Sign in / Sign up

Export Citation Format

Share Document