scholarly journals Error estimation of nanoindentation mechanical properties near a dissimilar interface via finite element analysis and analytical solution methods

2010 ◽  
Vol 25 (12) ◽  
pp. 2308-2316 ◽  
Author(s):  
Y. Zhao ◽  
T.C. Ovaert
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Element Model ◽  
Interfacial Region ◽  
Element Analysis ◽  
Probe Size ◽  
Close Proximity ◽  
Sample Data ◽  
Solution Methods ◽  
Quarter Space

Nanoindentation methods are well suited for probing the mechanical properties of a heterogeneous surface, since the probe size and contact volumes are small and localized. However, the nanoindentation method may introduce errors in the computed mechanical properties when indenting near the interface between two materials having significantly different mechanical properties. Here we examine the case where a soft material is loaded in close proximity to an interface of higher modulus, such as the case when indenting bone near a metallic implant. The results are derived from both an approximate analytical quarter space solution and a finite element model, and used to estimate the error in indentation-determined elastic modulus as a function of the distance from the apex of contact to the dissimilar interface, for both Berkovich and spherical indenter geometries. Sample data reveal the potential errors in mechanical property determination that can occur when indenting near an interface having higher stiffness, or when characterizing strongly heterogeneous materials. The results suggest that caution should be used when interpreting results in the near-interfacial region.

Material Characteristic for Capability Analysis of Solid Tire by Finite Element Method

2018 ◽  
Vol 777 ◽  
pp. 416-420
Author(s):  
Juthanee Phromjan ◽  
Chakrit Suvanjumrat
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Element Model ◽  
Average Error ◽  
Element Analysis ◽  
Compression Load ◽  
Stress Strain Relation ◽  
The Finite Element Analysis ◽  
Capability Analysis ◽  
The Finite Element Model

The natural rubber compound of each layer of solid tire had determined the mechanical properties in tension. It was found that the stress-strain relation of each material tire layer was fitted very well with the Ogden constitutive model. The R2 which was 0.986, 0.996 and 0.985 represented the certain curve fitting on the internal, middle and tread layer of solid tire, respectively. Subsequently, the Ogden model was implemented in the finite element model of the rubber specimen and solid tire. The finite element analysis results obtained an average error of 18.00% and 14.63% for the specimen and solid tire model by comparing to the physical experiment, respectively. Particularly, the mechanical properties of the natural compounds could be used to predict the ultimate compression load for the solid tire failure.

Shrinkage and Creep of Concrete on the Mechanical Properties of Cable-Stayed Bridge

2012 ◽  
Vol 594-597 ◽  
pp. 1498-1503
Author(s):  
Heng Shan Gao ◽  
Tie Ying Li
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Element Model ◽  
Main Beam ◽  
Construction Process ◽  
Analysis Software ◽  
Element Analysis ◽  
Concrete Shrinkage ◽  
Cable Stayed Bridge ◽  
Shrinkage And Creep

In this paper, using the universal finite element analysis software SAP2000 to build a large span cable-stayed bridge with finite element model, using a stepwise analysis finite element method to study the concrete shrinkage and creep efforts on the main beam inner force and deformation, cable tension during the cable-stayed bridge construction process and after the bridge. Research results show that the effects of shrinkage and creep in the finished bridge cannot be ignored, and the results can be used as reference for the design of similar projects.

scholarly journals Numerical investigation of the mechanical properties of the additive manufactured bone scaffolds fabricated by FDM: the effect of layer penetration and post-heating

2017 ◽  
Author(s):  
Saman Naghieh ◽  
Mohammad Reza Karamooz-Ravari ◽  
Mohsen Badrossamay ◽  
Ehsan Foroozmehr
Keyword(s):  
Mechanical Properties ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Elastic Modulus ◽  
Numerical Methods ◽  
Finite Element Model ◽  
Compression Test ◽  
Element Model ◽  
Element Analysis ◽  
Bone Scaffolds

In recent years, thanks to additive manufacturing technology, researchers have gone towards the optimization of bone scaffolds for the bone reconstruction. Bone scaffolds should have appropriate biological as well as mechanical properties in order to play a decisive role in bone healing. Since the fabrication of scaffolds is time consuming and expensive, numerical methods are often utilized to simulate their mechanical properties in order to find a nearly optimum one. Finite element analysis is one of the most common numerical methods that is used in this regard. In this paper, a parametric finite element model is developed to assess the effects of layers penetration׳s effect on inter-layer adhesion, which is reflected on the mechanical properties of bone scaffolds. To be able to validate this model, some compression test specimens as well as bone scaffolds are fabricated with biocompatible and biodegradable poly lactic acid using fused deposition modeling. All these specimens are tested in compression and their elastic modulus is obtained. Using the material parameters of the compression test specimens, the finite element analysis of the bone scaffold is performed. The obtained elastic modulus is compared with experiment indicating a good agreement. Accordingly, the proposed finite element model is able to predict the mechanical behavior of fabricated bone scaffolds accurately. In addition, the effect of post-heating of bone scaffolds on their elastic modulus is investigated. The results demonstrate that the numerically predicted elastic modulus of scaffold is closer to experimental outcomes in comparison with as-built samples.

Prediction of Effective Mechanical Properties of Reinforced Braid by 3-D Finite Element Analysis

2006 ◽  
Vol 306-308 ◽  
pp. 799-804 ◽  
Author(s):  
J.R. Cho ◽  
J.I. Song ◽  
J.H. Choi
Keyword(s):  
Mechanical Properties ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Theoretical Work ◽  
Element Model ◽  
Helix Angle ◽  
Periodic Pattern ◽  
Superposition Method ◽  
Element Analysis ◽  
Effective Mechanical Properties

The numerical prediction of the effective mechanical properties of the reinforced braid inserted in automobile power steering hose is addressed. The key role of the reinforced braid layer is to suppress the excessive radial expansion of the hose subject to high pressure and temperature. The reinforced braid layer is in the structure composed of wrap and fill tows inclined to each with the specific helix angle. In order to predict the effective mechanical properties, we construct a 3-D finite element model of the unit cell (or RVE) of the reinforced braid in a periodic pattern, in which the detailed geometry of individual fiber tows is fully modeled. By making use of the superposition method and the 3-D finite element analysis, the effective mechanical properties are predicted. Numerical experiments illustrating the theoretical work are also presented.

scholarly journals Finite Element Analysis of Anchor Leg Improved Trough Embedded Parts Based on ABAQUS

2019 ◽  
Vol 79 ◽  
pp. 01010
Author(s):  
Xin Huang ◽  
Yunfan Gu ◽  
Baocun Shi ◽  
Xin Chen ◽  
Wei Jiang
Keyword(s):  
Mechanical Properties ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Circular Hole ◽  
Shear Failure ◽  
Element Model ◽  
Ultimate Stress ◽  
Element Analysis ◽  
Anchor Plates ◽  
The Finite Element Model

Reasonable and accurate simulations of failure behaviors of steel-concrete composite members with trough embedded parts is of great significance for the study of joint failure mechanism of prefabricated components in assembled buildings. Based on the implicit solution module of ABAQUS, the anchor legs of 5234 trough embedded parts are redesigned. The cylindrical anchor legs are designed as anchor plates with different diameter holes. The finite element model of the anchor leg of improved 5234 trough embedded parts and that of concrete are established. The mechanical properties of the specimens under bending and shear failure are simulated. And take a research on the improved trough embedded parts. The results show that the ultimate stress of concrete and the ultimate stress of embedded parts decrease first, then increase and then decrease with the increase of the diameter of circular hole, and the displacement of anchor leg of embedded parts decreases first and then increases with the increase of the diameter of circular hole. When the diameter of circular hole is 10.0 mm, the ultimate stress of concrete, the ultimate stress of embedded parts and the displacement of anchor leg are the smallest, and the mechanical properties of embedded parts are improved the most.

Finite Element Analysis on Concrete-Filled Square Steel Tube Short Columns with Inner CFRP Profiles under Axial Compression

2014 ◽  
Vol 578-579 ◽  
pp. 335-339 ◽  
Author(s):  
Guo Chang Li ◽  
Bing Zhou ◽  
Jiang Hua Pan
Keyword(s):  
Mechanical Properties ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Axial Compression ◽  
Constitutive Models ◽  
Element Model ◽  
Steel Tube ◽  
Element Analysis ◽  
Short Columns ◽  
Square Steel Tube

The new composite structure concrete-filled square steel tube (CFST) column with inner CFRP profiles is proposed. A finite element model is presented to investigate the mechanical behavior of CFST short columns with internal CFRP profiles subjected to axial compression using ABAQUS based on reasonable constitutive models of materials. In a addition, the content of CFRP profiles and width thickness ratio of steel tube’ effect are considered on mechanical properties of the column. Based on the model, the whole stage of axial compression of the short columns, failure mode and the stress mechanism of the ultimate bearing capacity state are calculated and analyzed.

An experimental and numerical study of the mechanical properties of a cross-linked polyethylene subject to low-velocity impacts

2018 ◽  
Vol 233 (8) ◽  
pp. 1604-1618
Author(s):  
Andrew Cummings
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Numerical Study ◽  
Element Model ◽  
Dynamic Mechanical Properties ◽  
Small Scale ◽  
Analysis Model ◽  
Low Velocity ◽  
Element Analysis ◽  
Rate Dependent

The response of a thermosetting cross-linked polyethylene, commercially referred to as Vitrite, has been studied experimentally and numerically. Two different testing programmes have been carried out; the first to characterise the mechanical properties of the material, and the second to provide information to validate a finite element model. Strain-rate dependent stress–strain curves have been obtained to determine the static and dynamic mechanical properties of Vitrite in tension and compression. Guided drop testing of a mass onto small scale samples has been used to study their deformation and rebound response. This has been compared to the deformation results of a finite element analysis model of the drop tests using the data obtained from the material characterisation tests as input to the model.

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