Discussion of “Nonlinear Stress Analysis of Reinforced Concrete”

Abstract Methods of mechanical properties measurement have become more sophisticated as the necessities of nonlinear stress analysis have been appreciated. The linear cases, typical of low temperature failure, have been successfully handled by elastic analysis, but the nonlinear complexities of the higher temperature regimes require analytical correlation of real properties and analytical methods of using such correlations. The wide variability of mechanical properties observed in solid propellants requires that predictions of failure be based on estimates of upper and lower expected limits rather than viewing failure as a point value, as is often done in stress analysis of metallic structures.

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Nonlinear Stress Analysis of Titanium Implants by Finite Element Method

Dental Materials Journal ◽

10.4012/dmj.27.633 ◽

2008 ◽

Vol 27 (4) ◽

pp. 633-639 ◽

Cited By ~ 18

Author(s):

Sakae NAGASAWA ◽

Keigo HAYANO ◽

Tooru NIINO ◽

Kazunori YAMAKURA ◽

Takamitsu YOSHIDA ◽

...

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Stress Analysis ◽

Titanium Implants ◽

Nonlinear Stress ◽

Element Method

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Electrochemical Corrosion Finite Element Analysis and Burst Pressure Prediction of Externally Corroded Underground Gas Transmission Pipelines

Journal of Pressure Vessel Technology ◽

10.1115/1.4038224 ◽

2017 ◽

Vol 140 (1) ◽

Cited By ~ 1

Author(s):

Ibrahim M. Gadala ◽

Magd Abdel Wahab ◽

Akram Alfantazi

Keyword(s):

Finite Element ◽

Stress Analysis ◽

Reaction Kinetics ◽

Moving Boundary ◽

Electrochemical Corrosion ◽

Burst Pressure ◽

Element Analysis ◽

Corrosion Defect ◽

Nonlinear Stress ◽

Pipeline Wall

An integrative numerical simulation approach for pipeline integrity analysis is presented in this work, combining a corrosion model, which is the main focus of this paper, with a complementary structural nonlinear stress analysis, using the finite element method (FEM). Potential distributions in the trapped water existing beneath pipeline coating disbondments are modeled in conjunction with reaction kinetics on the corroding exposed steel surface using a moving boundary mesh. Temperature dependencies (25 °C and 50 °C) of reaction kinetics do not greatly affect final corrosion defect geometries after 3-yr simulation periods. Conversely, cathodic protection (CP) levels and pH dependencies within the near-neutral pH range (6.7–8.5) strongly govern depth profiles caused by corrosion, reaching a maximum of ∼3 mm into the pipeline wall. A 0.25 V amplification of CP potential combined with a 0.5 mm widening in disbondment opening size reduces defect penetration by almost 30%. Resulting corrosion defect geometries are used for stress examinations and burst pressure evaluations. Furthermore, nonlinear elastic–plastic stress analysis is carried out using shell elements in order to predict the burst pressure of corroded pipes. Corrosion is modeled by reducing the stiffness of a damaged element that has the dimensions of the defect. The predicted burst pressures are in good agreement with those obtained using an experimental-based formula.

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Nonlinear Stress Analysis of Dust Covers for Ball Joint of Automotive Steering System

Transactions of the Korean Society of Mechanical Engineers A ◽

10.3795/ksme-a.2013.37.10.1297 ◽

2013 ◽

Vol 37 (10) ◽

pp. 1297-1303

Author(s):

Ji Ho Kim ◽

Boo Youn Lee

Keyword(s):

Stress Analysis ◽

Steering System ◽

Ball Joint ◽

Nonlinear Stress

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Study on the Composite Structure of Aluminum Foam-Filled Thin-Walled Metal Tube to Reduce the Charge Overload inside the Projectile during the Penetration Process

Shock and Vibration ◽

10.1155/2020/8887893 ◽

2020 ◽

Vol 2020 ◽

pp. 1-11

Author(s):

Fudi Liang ◽

Zengyou Liang ◽

Dezhi Deng

Keyword(s):

Reinforced Concrete ◽

Stress Analysis ◽

Composite Structure ◽

High Speed ◽

Aluminum Foam ◽

Metal Tube ◽

Penetration Process ◽

Mathematical Expressions ◽

Foam Filled ◽

Thin Walled

When a projectile penetrates a target at high speed, the charge loaded inside the projectile usually bears a high overload, which will consequently severely affect its performance. In order to reduce the overload of the charge during the penetration process, the structure of the projectile was improved by adding two buffers at both ends of the charge. In this study, the mathematical expressions were first gained about the axial buffering force generated by the thin-walled metal tube, aluminum foam, and the composite structure of aluminum foam-filled thin-walled metal tube when they were impacted by the high-speed mass block through reasonable assumptions and stress analysis. During the experiment on the high-speed projectile penetrating reinforced concrete target, the acceleration curve of the charge and the projectile body were obtained. The results show that the maximum overload that the charge was subjected to during the launch and penetration process was significantly reduced, and the change in overload, which the charge was subjected to during the penetration process, was also less obvious.

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