scholarly journals Implementation of computer procedures and stress-strain laws in geotechnical engineering, 2 volumes, edited by C.S. Desai and S.K. Saxena, Acorn Press (Box 4007, Duke Station, Durham, N.C. 27706), 1981, No. of pages: 704, Price: $48.50 (U.S.) (extra U.S. $12.00 for outside of U.S. and Canada); and Evaluation of constitutive parameters for geological materials, edited by C.S. Desai, 1981, No. of pages: 151, Price: U.S. $15.00 (available from first author Department of Civil Engineering, University of Arizona, Tucson, AZ 85721)

1982 ◽  
Vol 18 (1) ◽  
pp. 165-166
Author(s):  
J. M. Zaman
Keyword(s):  
Civil Engineering ◽  
Geotechnical Engineering ◽  
Stress Strain ◽  
Geological Materials ◽  
University Of Arizona ◽  
Constitutive Parameters

scholarly journals An Improved Lagrangian-Inverse Method for Evaluating the Dynamic Constitutive Parameters of Concrete

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1871
Author(s):  
Xinlu Yu ◽  
Yingqian Fu ◽  
Xinlong Dong ◽  
Fenghua Zhou ◽  
Jianguo Ning
Keyword(s):  
High Speed ◽  
Inverse Method ◽  
Image Correlation ◽  
Analysis Method ◽  
Stress Strain ◽  
Optical Techniques ◽  
Element Simulation ◽  
Non Linear ◽  
Constitutive Parameters ◽  
Inverse Analysis Method

The dynamic constitutive behaviors of concrete-like materials are of vital importance for structure designing under impact loading conditions. This study proposes a new method to evaluate the constitutive behaviors of ordinary concrete at high strain rates. The proposed method combines the Lagrangian-inverse analysis method with optical techniques (ultra-high-speed camera and digital image correlation techniques). The proposed method is validated against finite-element simulation. Spalling tests were conducted on concretes where optical techniques were employed to obtain the high-frequency spatial and temporal displacement data. We then obtained stress–strain curves of concrete by applying the proposed method on the results of spalling tests. The results show non-linear constitutive behaviors in these stress–strain curves. These non-linear constitutive behaviors can be possibly explained by local heterogeneity of concrete. The proposed method provides an alternative mean to access the dynamic constitutive behaviors which can help future structure designing of concrete-like materials.

scholarly journals Role of Research Methodology in Civil Engineering

2021 ◽  
Vol 9 (8) ◽  
pp. 1114-1117
Author(s):  
Shubhra Upadhyay
Keyword(s):  
Research Methodology ◽  
Structural Engineering ◽  
Civil Engineering ◽  
Geotechnical Engineering ◽  
Pushover Analysis ◽  
Research Problem ◽  
Research Field ◽  
Research Methodologies ◽  
Research Problems

Abstract: Research methodology is a method to consistently resolve the research problem. Research methodology may be termed as knowledge of science for studying how research is done empirically and theoretically. In this paper we have studied different steps that are usually taken by a researcher in studying his research problem of civil engineering along with the logic behind them. It is utmost important for the researcher to have the knowledge of the research techniques/method along with its methodology. Researchers also need to understand the presumptions underlying various techniques and they need to know the criteria by which they can decide that certain techniques and procedures will be applicable to certain problems and others will not. All this means that it is necessary for the researcher to design his methodology for his problem as the same may differ from problem to problem. Research methodologies are the need of hour due to modernization in research field of civil engineering. Nowadays only innovative research methods are adopted in branch of civil engineering like geotechnical engineering, geoenvironmental engineering, structural engineering, geo-mechanics etc so that best results are obtained from these methodologies. In this paper we are going to discuss role of some of the research methodologies used for research purposes in geotechnical engineering for respective research problems. Keywords: Research methodology, geotechnical engineering, pushover analysis, FLAC method, numerical method,

Composite Soil: Fiber Inclusion and Strength

2011 ◽  
Vol 308-310 ◽  
pp. 1646-1650 ◽  
Author(s):  
Amin Chegenizadeh ◽  
Hamid Nikraz
Keyword(s):  
Aspect Ratio ◽  
Fiber Length ◽  
Civil Engineering ◽  
Geotechnical Engineering ◽  
Reinforced Soil ◽  
Fiber Content ◽  
Compression Tests ◽  
Unconfined Compression ◽  
Pavement Engineering ◽  
Grade Material

Reinforced soil has been among the most effective soil modification materials. Its use has been expanded rapidly into civil engineering, geotechnical engineering and pavement engineering. Reinforcing subgarde in pavement systems has always been an issue. This study focuses on effect of fiber inclusion on the strength of subgrade material. Plastic fiber was used for this investigation. Fiber contents and aspect ratio have been changed during these tests. The fiber percentage varied from 0 % (for unreinforced samples) to 2%. Clay was used as sub grade material. Unconfined compression tests were carried out to investigate behaviour of the composite under different condition. The fiber length and fiber content found to play important rule on the strength of composite. Furthermore it was observed that ductility of sample increased by fiber inclusion.

scholarly journals Selection of the Optimal FBG Length for Use in Stress-Strain State Diagnostic Systems

2019 ◽  
Vol 5 (12) ◽  
pp. 2700-2707 ◽  
Author(s):  
Viktor Vikulov ◽  
Aleksandr V. Todorov ◽  
Aleksey V. Faustov ◽  
Nikolay L. Lvov
Keyword(s):  
Construction Industry ◽  
Strain State ◽  
Civil Engineering ◽  
Bragg Gratings ◽  
Physical Principle ◽  
Diagnostic Systems ◽  
Stress Strain ◽  
Measuring Systems ◽  
Stress Strain State ◽  
Selection Of

The article discusses fiber-optic sensors (FOS) based on the Bragg gratings for measuring systems for diagnostics of stress-strain state. Currently, such diagnostic systems are widely used in construction, industry and civil engineering. The physical principle of deformation diagnostics using FOS. The issues of mounting the sensor on the measured area (detail) are separately discussed. The principle of processing the hardware and software of sensors based on Bragg gratings is described. Research method - bench experiments that were carried out on an equal-deformation beam in order to evaluate the change in the width of the reflected FOS peak at different lengths recorded by the Bragg gratings in order to determine the optimal one. The change in the spectrum of the reflected peak under various deforming influences was monitored. Based on the results obtained, recommendations are made on the use of gratings of various lengths in the diagnostic systems for the stress-strain state of parts and assemblies for civil engineering tasks.

Mechanical Properties of Ion-Irradiated Stainless Steel Determined by Nanoindentation Tests and Finite Element Analyses

2020 ◽  
Author(s):  
Jae Min Sim ◽  
Yoon-Suk Chang ◽  
Byeong Seo Kong ◽  
Changheui Jang
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Test Data ◽  
Radiation Effects ◽  
Ion Irradiation ◽  
Nanoindentation Test ◽  
Finite Element Analyses ◽  
Stress Strain ◽  
Term Operation ◽  
Constitutive Parameters

Abstract While austenitic stainless steels (ASSs) have been widely adopted for reactor vessel internals because of their excellent material properties, diverse ageing-related degradation may occur due to high temperature, corrosive and neutron radiation environments during operation. In particular, since the change of mechanical properties is a major concern in long-term operation but it is difficult to prepare and handle standard specimens influenced by neutrons, most of experimental researches for enhanced understanding of the radiation effects have been focused on high-energetic ion-irradiation and tests of small specimens. In this study, systematic finite element analyses were carried out to quantify changing mechanical properties based on both virgin and ion-irradiated nanoindentation test data of typical ASS material. First of all, numerical analysis was carried out to obtain unirradiated material constitutive parameters by using trial set along the miniature specimen and comparing test data, and then indentation stress-strain (ISS) curve was derived. Subsequently, ISS was converted into uniaxial stress-strain response taking into account simple correlation. Finally, with regard to the irradiated material, similar analytical procedures were established. 304 SS was irradiated with 2 MeV proton and radioactivity is being measured. Comparison between analysis result and experimental one will be carried out, of which details and key findings will be discussed.

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