Study of the strain rate dependence of polymer, metal materials by carrying out tension tests and numerical analysis for a finite element model of electronic product

2018 ◽  
Vol 2018.93 (0) ◽  
pp. 311
Author(s):  
Yutaka TSUYAMA ◽  
Tatsuya YAMAGUCHI ◽  
Tsutomu UMEDA ◽  
Koji MIMURA ◽  
Ryotaro MIURA ◽  
...  
Keyword(s):  
Finite Element ◽  
Numerical Analysis ◽  
Finite Element Model ◽  
Strain Rate ◽  
Element Model ◽  
Rate Dependence ◽  
Strain Rate Dependence ◽  
Tension Tests ◽  
Polymer Metal ◽  
Metal Materials

Validation of a New Finite Element Model for Human Knee Ligaments for Use in High Speed Automotive Collisions

2009 ◽  
Author(s):  
Chiara Silvestri ◽  
Louis R. Peck ◽  
Kristen L. Billiar ◽  
Malcolm H. Ray
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Strain Rate ◽  
High Speed ◽  
Element Model ◽  
Knee Ligament ◽  
Knee Ligaments ◽  
Human Knee ◽  
Dynamic Representation ◽  
Failure Properties

A finite element model of knee human ligaments was developed and validated to predict the injury potential of occupants in high speed frontal automotive collisions. Dynamic failure properties of ligaments were modeled to facilitate the development of more realistic dynamic representation of the human lower extremities when subjected to a high strain rate. Uniaxial impulsive impact loads were applied to porcine medial collateral ligament-bone complex with strain rates up to145 s−1. From test results, the failure load was found to depend on ligament geometric parameters and on the strain rate applied. The information obtained was then integrated into a finite element model of the knee ligaments with the potential to be used also for representation of ligaments in other regions of the human body. The model was then validated against knee ligament dynamic tolerance tests found in literature. Results obtained from finite element simulations during the validation process agreed with the outcomes reported by literature findings encouraging the use of this ligament model as a powerful and innovative tool to estimate ligament human response in high speed frontal automotive collisions.

Modeling of the Mechanical Properties of a Polymer-Metal Foam Interpenetrating Phase Composite

2014 ◽  
Author(s):  
Jiayun Gao ◽  
Nassif Rayess
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Aluminum Foam ◽  
Metal Foam ◽  
Geometric Model ◽  
Element Model ◽  
Load Direction ◽  
Qualitative And Quantitative ◽  
Polymer Metal ◽  
The Finite Element Model

An interpenetrating phase composite is made by injection molding thermoplastic polymers into the voids of open-cell aluminum foam. Two types of polypropylene and an acetyl were mechanically introduced into the open cells of a Duocel® aluminum foam. Prior experimental work revealed that the combination of the polymer and the metal foam yields a hybrid that is stiffer than the polymer alone but has a reduced tensile strength. A finite element model using a tetrakaidecahedral unit cell is used to model the metal foam ligaments with the polymer occupying the remaining space. The geometric model as well as the interface between the two materials were validated against the experimental results. The resulting conclusions are that the aluminum ligaments oriented along the load direction cause an increase in stiffness but ligaments oriented laterally cause stress concentration that yield lower strength. The finite element model is used to give both qualitative and quantitative explanations of the physics of the interrelations between the metal foam and the polymer.

Numerical Analysis of the Influence of Material Model on Response of Compressed Imperfect Thin-Walled Channel

2014 ◽  
Vol 611 ◽  
pp. 188-193 ◽  
Author(s):  
Vladimír Ivančo ◽  
Gabriel Fedorko ◽  
Ladislav Novotný
Keyword(s):  
Finite Element ◽  
Numerical Analysis ◽  
Model Selection ◽  
Finite Element Model ◽  
Material Model ◽  
Element Model ◽  
Material Models ◽  
Geometric Imperfections ◽  
Walled Channel ◽  
Thin Walled

In the paper, the influence of material model selection on the behaviour of Finite Element model of a compressed thin-walled channel is studied. Results of three material models of channels of two different lengths and two types of geometric imperfections are compared and discussed.

Numerical Analysis of Mechanical Properties of Precast Segmental Concrete Test Beam with External Tendons

2013 ◽  
Vol 639-640 ◽  
pp. 460-469
Author(s):  
Hai Bo Jiang ◽  
Yan Song Deng ◽  
Yun Qiu ◽  
Chun Gen Wei ◽  
Li Chen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Numerical Analysis ◽  
Finite Element Model ◽  
Simulation Analysis ◽  
Crack Opening ◽  
Element Model ◽  
Test Beam ◽  
External Tendons ◽  
Key Factor

A finite element model is proposed for numerical analysis of mechanical properties of precast segmental concrete test beam with external tendons. The 3D finite element model of test beam is established by SOLID65 element in ANSYS software, while the dry joint between segments is simulated by contact element, and the attachment between concrete beam and external prestressed tendons is achieved by node coupling method. Numerical simulation analysis reveals structural behavior, stress variations and crack opening cases of joints of the test beam by considering the concrete material and geometric nonlinearity. Influencing factors of the bending mechanical properties of the test beam are researched with different tendon types, secondary effect of external tendons and external tendon slip at deviation. Results of the numerical analysis reveal that the segmental joints are in the compressive state below the 300kN.Crack opening is the key factor of the mechanical properties of the test beam above the 300kN.The results can be used for structural design of precast segmental bridge.

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