scholarly journals Evaluation of Flood Water Damage on Asphalt Concrete Using Elastic Modulus Ratio

2019 ◽  
Author(s):  
Arief Setiawan ◽  
Latif Suparma ◽  
Agus Mulyono
Keyword(s):  
Elastic Modulus ◽  
Asphalt Concrete ◽  
Modulus Ratio ◽  
Flood Water ◽  
Water Damage

scholarly journals Cytocompatibility of Ti–xZr alloys as dental implant materials

2021 ◽  
Vol 32 (5) ◽  
Author(s):  
Pinghua Ou ◽  
Cong Hao ◽  
Jue Liu ◽  
Rengui He ◽  
Baoqi Wang ◽  
...  
Keyword(s):  
Elastic Modulus ◽  
Pure Titanium ◽  
Dead Cell ◽  
Commercially Pure Titanium ◽  
Modulus Ratio ◽  
High Mechanical Strength ◽  
Commercially Pure ◽  
Low Elastic Modulus ◽  
Cell Assays ◽  
Osteogenic Induction

AbstractTi–xZr (x = 5, 15, 25, 35, 45% wt%) alloys with low elastic modulus and high mechanical strength were fabricated as a novel implant material. The biocompatibility of the Ti–xZr alloys was evaluated by osteoblast-like cell line (MG63) in terms of cytotoxicity, proliferation, adhesion, and osteogenic induction using CCK-8 and live/dead cell assays, electron microscopy, and real-time PCR. The Ti–xZr alloys were non-toxic and showed superior biomechanics compared to commercially pure titanium (cpTi). Ti–45Zr had the optimum strength/elastic modulus ratio and osteogenic activity, thus is a promising to used as dental implants.

Study on the Dynamic Performance of Asphalt Concrete under Passive Confined Pressure

2012 ◽  
Vol 226-228 ◽  
pp. 1755-1759
Author(s):  
Hua Zhang ◽  
Fei Li ◽  
Yu Wei Gao
Keyword(s):  
Elastic Modulus ◽  
Asphalt Concrete ◽  
Poisson Ratio ◽  
Dynamic Properties ◽  
Dynamic Performance ◽  
Dynamic Strength ◽  
Confining Pressure ◽  
Mechanical Behaviors ◽  
One Dimensional ◽  
Stress States

An improved passive confining pressure SHPB method was used to study the dynamic mechanical behaviors of asphalt concrete under quasi-one dimensional strain state. The effect of confining jacket material and its geometrical sizes on the confining pressure were discussed. The dynamic strength, dynamic modulus of elasticity and dynamic Poisson ratio of asphalt concrete were obtained. The influential rules of confining pressure on the dynamic properties were studied by comparing the stress-strain curves of asphalt concrete under different stress states. The study found that passive confining greater impact on the strength of asphalt concrete than elastic modulus and Poisson ratio, but the elastic modulus improved with the increase of confining pressure.

Analysis on Functionally Graded Material Coating Interface Crack

2012 ◽  
Vol 602-604 ◽  
pp. 1596-1599
Author(s):  
Bo He ◽  
Chang Qing Sun
Keyword(s):  
Elastic Modulus ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Interface Crack ◽  
Functionally Graded ◽  
Physical Parameters ◽  
Mode I ◽  
Modulus Ratio ◽  
Functionally Graded Coating ◽  
Graded Coating

It is assumed that the physical parameters of functionally graded coating material accords with the variation of degree n polynomial, and based on this material model, the behavior of crack fracture on the interface of functionally graded coating is studied. The results show that when the functionally graded coating structure bears a tension load, stress intensity factors of mode I and mode II exist at the same time generally, and the intensity factor of mode I occupies a leading position all along. Besides, when the elastic modulus ratio of the base to the functionally graded coating top is 5 and the elastic modulus of functionally graded coating varies linearly, the stress intensity factor of interface crack is the smallest, and with the increasing of elastic modulus ratio, the optimal non-uniform parameter tends to be larger than 1.

Elastic Modulus Prediction of Asphalt Concrete

1999 ◽  
Vol 11 (3) ◽  
pp. 236-241 ◽  
Author(s):  
Guoqiang Li ◽  
Yongqi Li ◽  
J. B. Metcalf ◽  
Su-Seng Pang
Keyword(s):  
Elastic Modulus ◽  
Asphalt Concrete

Research on the Temperature Stress Field of Interface End between Asphalt Concrete Overlay and Concrete Pavement

2010 ◽  
Vol 160-162 ◽  
pp. 1704-1711
Author(s):  
Yu Wei Zhang ◽  
Qing Guo Yang ◽  
Zhi Zhong Tu
Keyword(s):  
Elastic Modulus ◽  
Stress Field ◽  
Asphalt Concrete ◽  
Interface Design ◽  
Concrete Pavement ◽  
Crack Tip Field ◽  
Initial Stress Field ◽  
Asphalt Overlay ◽  
Paving Asphalt ◽  
Cement Concrete Pavement

For the interface end formed after paving asphalt overlay on cement concrete pavement, the stress field of interface end is very important for both structural analysis and interface design when the temperature drops. The stress field of interface end can be gotten with the crack-tip field theory that consider displacement continuation and stress equality on each side of interface, but it needs further verification to prove whether the initial stress field can satisfy far field boundary condition when temperature dropping. In conditions of different material properties, different plane dimension and different thickness of asphalt overlay the stress field is calculated with the finite element method (FEM), and the results show that the forms of theoretical solution can exactly describe stress field of the interface end when temperature dropping. The stress field of interface end indicates that when the elastic modulus of asphalt overlay becomes lager, the stress singularity’s degree of interface end will reduce. As for the interface end formed after paving asphalt concrete overlay on the concrete pavement, improving the elastic modulus of asphalt overlay is beneficial.

The Effect of Inclined Loads on the Large Deflection Behaviour of Elastoplastic Work-Hardening Straight and Pre-Bent Cantilevers

1995 ◽  
Vol 209 (2) ◽  
pp. 87-96 ◽  
Author(s):  
J H Liu ◽  
A G Atkins ◽  
A J Pretlove
Keyword(s):  
Elastic Modulus ◽  
Theoretical Analysis ◽  
Work Hardening ◽  
Reasonable Agreement ◽  
Large Deflection ◽  
Plastic Region ◽  
Experimental Results ◽  
Modulus Ratio ◽  
Inclined Loads

A theoretical analysis is presented to examine the effect of inclined tip load on the large deflection behaviour of an elastoplastic cantilever with linear work hardening. The cantilever is either initially straight or pre-bent to a tip angle of ø (see Fig. 1). When the load is large enough, the overall deformation of a pre-bent cantilever is smaller than that of an initially straight one as a result of the influence of the guided end. The maximum plastic region spm in the cantilever increases with the force angle ø and the plastic-elastic modulus ratio α, but decreases as the beam flexibility parameter β increases. Some unstable deformation may occur in the initially straight cantilever when ø > π/2 and this depends on the value of α and β. Reasonable agreement is obtained between the theoretical analysis and experimental results.

Effect of Yield Strength to Elastic Modulus Ratio on Finite Element Based Plastic Loads for Elbows Under Bending

2008 ◽  
Author(s):  
Kuk-Hee Lee ◽  
Yun-Jae Kim
Keyword(s):  
Elastic Modulus ◽  
Yield Strength ◽  
Modulus Ratio ◽  
Yield Strain ◽  
Perfectly Plastic ◽  
Plastic Materials ◽  
Out Of Plane ◽  
Asme Code ◽  
Elastic Perfectly Plastic ◽  
Experimental Values

This paper quantifies the effect of the yield strength-to-elastic modulus ratio (yield strain) on plastic loads (defined by the twice-elastic-slope according to the ASME code) for 90° elbows under in-plane and out-of-plane bending. Results are based on extensive and systematic FE limit analyses assuming elastic-perfectly plastic materials. Based on FE results, a simple approximation of plastic loads of pipe bends, incorporating the yield strength-to-elastic modulus ratio effect, is proposed. To validate the proposed approximation, predicted plastic moments are compared with published full-scale pipe test data, showing that the proposed approximation gives overall lower than the FE results and close to experimental values.

Geometric design of 4D printed bilayer structures for accurate folding deformation

2021 ◽  
pp. 1045389X2110411
Author(s):  
Han Liu ◽  
Zhenyu Liu ◽  
Guifang Duan ◽  
Jianrong Tan
Keyword(s):  
Elastic Modulus ◽  
Design Method ◽  
Optimization Method ◽  
Geometric Design ◽  
Geometric Parameters ◽  
Experimental Results ◽  
Deformation Model ◽  
Bilayer Structure ◽  
Modulus Ratio ◽  
Surrogate Based Optimization

Geometric parameters of 4D printed bilayer structure determine its deformation to a great extent. This paper proposed a geometric design method of 4D printed bilayer structures for accurate folding deformation. To precisely calculate the deformation, a folding deformation model of 4D printed bilayer structure is constructed considering thickness ratio and elastic modulus ratio. Then, for a target folding deformation, an adaptive surrogate-based optimization method is employed to obtain the geometric parameters of a given 4D printed bilayer structure. The numerical and physical experimental results show that the geometric parameters of 4D printed bilayer structure can be well designed by the proposed method.

Stress Analysis for the Orthotropic Pressurized Structure of Cylindrical Shell with Nozzle

2016 ◽  
Vol 853 ◽  
pp. 377-383 ◽  
Author(s):  
Jing Zhang ◽  
Chang Yu Zhou ◽  
Xiao Hua He
Keyword(s):  
Cylindrical Shell ◽  
Elastic Modulus ◽  
Thickness Ratio ◽  
Modulus Ratio ◽  
Analysis And Design ◽  
Finite Element Software ◽  
Isotropic Structure ◽  
Practical Engineering ◽  
Thin Walled ◽  
Thin Shell Theory

The structure of cylindrical shell with nozzle has been widely used in pressure equipment. The analysis and design for the structure of cylindrical shell with nozzle are generally based on the isotropy of metal at present, which may cause certain error and risk. Because of the approaches of rolling, heat treatment, and so on, the materials’ properties are different along each direction in practical engineering. In this paper, based on anisotropic thin shell theory, the analysis for orthotropic pressurized structure of thin-walled cylindrical shell with nozzle was conducted by using finite element software Ansys. The influences of thickness ratio and elastic modulus ratio were comprehensively considered, and also compared with the stress results under isotropic structure. The analysis results show that the values of stress and stress concentration factor for the structure of cylindrical shell with nozzle decrease with elastic modulus ratio, but increase with thickness ratio. Compared with the influence of thickness ratio, the elastic modulus ratio has significant effect on stress level. The rational use of the material anisotropic property can optimize the structure of thin-walled cylindrical shell with nozzle. The results in present paper provided a reference for the design of orthotropic pressurized structure of cylindrical shell with nozzle.

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