Proposal for an Empirical Evaluation of Rotation Capacity of RHS Aluminium Alloy Beams Based on FEM Simulations

2016 ◽  
Vol 710 ◽  
pp. 231-237 ◽  
Author(s):  
Paolo Castaldo ◽  
Elide Nastri ◽  
Vincenzo Piluso
Keyword(s):  
Aluminium Alloy ◽  
Shape Factor ◽  
Parametric Analysis ◽  
Empirical Relationship ◽  
Empirical Evaluation ◽  
Regression Analyses ◽  
Empirical Relationships ◽  
Rotation Capacity ◽  
Moment Gradient ◽  
Insight Into

The aim of this work is the development of an empirical relationship for evaluating the rotation capacity of RHS aluminium alloy beams, for temper T4 and T6. The proposed relationships are based on the numerical results coming from an extensive parametric analysis performed by means of FE code ABAQUS for different materials, which gain insight into the influence of all the geometrical and mechanical parameters affecting the ultimate behaviour. In particular, the influence of the materials strain hardening, flange slenderness, web stiffness, shape factor and moment gradient the on the plastic behaviour of such beams has been investigated. Successively, by means of monovariate and multivariate non linear regression analyses, empirical relationships are provided in order to predict the rotation capacity of RHS aluminium alloy beams starting from their geometrical and mechanical properties. This paper is focused on this issue.

Evaluation of Rotation Capacity of RHS Aluminium Alloy Beams by FEM Simulation: Temper T4

2016 ◽  
Vol 710 ◽  
pp. 288-294 ◽  
Author(s):  
Paolo Castaldo ◽  
Elide Nastri ◽  
Vincenzo Piluso
Keyword(s):  
Aluminium Alloy ◽  
Shape Factor ◽  
Fem Simulation ◽  
Constitutive Law ◽  
Buckling Strength ◽  
Rotation Capacity ◽  
Numerical Assessment ◽  
Moment Gradient ◽  
The Moment ◽  
Rotation Behaviour

The aim of this work consists in the numerical assessment of the moment-rotation behaviour of RHS aluminium alloy beams subjected to non-uniform bending through an extensive parametric analysis performed by means of FE code ABAQUS investigating the influence of the main geometrical and mechanical parameters. In particular, the influence of the flange slenderness, web stiffness and moment gradient are investigated by adopting the constitutive law proposed by Eurocode 9 based on the Ramberg-Osgood model whose shape factor characterise the hardening behaviour of the material. The investigations concern these factors considered separately as well as their interaction. The results are herein reported with reference to temper T4 and show the importance of some of the investigated parameters on both buckling strength and rotation capacity of aluminium alloy beams.

Evaluation of Rotation Capacity of RHS Aluminium Alloy Beams by FEM Simulation: Temper T6

2016 ◽  
Vol 710 ◽  
pp. 281-287 ◽  
Author(s):  
Paolo Castaldo ◽  
Elide Nastri ◽  
Vincenzo Piluso
Keyword(s):  
Aluminium Alloy ◽  
Slenderness Ratio ◽  
Fem Simulation ◽  
Companion Paper ◽  
Constitutive Law ◽  
Geometrical Parameters ◽  
Rotation Capacity ◽  
Moment Gradient ◽  
The Moment ◽  
Material Constitutive Law

The aim of this work is the numerical assessment of the ultimate behaviour of aluminium alloy beams subjected to non-uniform bending. An extensive numerical analysis has been performed by means of FE code ABAQUS with reference to RHS sections considering different values of the main geometrical and mechanical parameters. In particular, regarding the geometrical parameters the flange slenderness, the flange-to-web slenderness ratio and the moment gradient parameter have been considered. In particular, their influence on the ultimate behaviour of such beams has been investigated by adopting the material constitutive law proposed by Eurocode 9 based on the Ramberg-Osgood model. The investigations concern these parameters considered separately as well as their interaction. The results are herein reported with reference to temper T6 and show the importance of the investigated parameters on the buckling strength and the rotational capacity of aluminium alloy beams. Temper T6 gives rise to a quite low hardening compared to temper T4, which is analysed in a companion paper.

Retirement intentions: what is the role of push factors in predicting retirement intentions?

2012 ◽  
Vol 33 (6) ◽  
pp. 988-1008 ◽  
Author(s):  
JODI OAKMAN ◽  
YVONNE WELLS
Keyword(s):  
Job Satisfaction ◽  
Social Cohesion ◽  
Multivariate Regression ◽  
Regression Analyses ◽  
Length Of Service ◽  
Older Employees ◽  
Work Factors ◽  
Retirement Intentions ◽  
Insight Into

ABSTRACTPopulation ageing will significantly impact labour markets in most Organisation for Economic Cooperation and Development countries and as a result individuals will need to remain in paid employment for longer to fund their retirement years. This study examines the retirement intentions of employees of a large public-sector organisation located in Victoria, Australia that was interested in developing policies to assist with retention of their mature-age workforce. Multivariate regression analyses were used to identify the most important predictors of intention to retire. The dependent variable, Intended timing of retirement, was analysed in two forms, as continuous and dichotomised measures. Age and Length of service were strong independent predictors of Intention to retire soon (within five years). Of the work factors that were analysed (Job satisfaction, Job demands, Job control, and Social cohesion), low Job satisfaction and high Social cohesion scores indicated an increased likelihood of retiring soon. The results provide some insight into the development of organisational interventions that might assist with retaining older employees for longer.

scholarly journals Combining Multiple Organizational-level Databases: An Empirical Evaluation of Different Matching Methods

2021 ◽  
pp. 004912412098618
Author(s):  
Tim de Leeuw ◽  
Steffen Keijl
Keyword(s):  
Empirical Evaluation ◽  
Organizational Level ◽  
Random Errors ◽  
Data Set ◽  
Future Studies ◽  
Matching Methods ◽  
Matching Process ◽  
Significant Relationships ◽  
Research Findings ◽  
Insight Into

Although multiple organizational-level databases are frequently combined into one data set, there is no overview of the matching methods (MMs) that are utilized because the vast majority of studies does not report how this was done. Furthermore, it is unclear what the differences are between the utilized methods, and it is unclear whether research findings might be influenced by the utilized method. This article describes four commonly used methods for matching databases and potential issues. An empirical comparison of those methods used to combine regularly used organizational-level databases reveals large differences in the number of observations obtained. Furthermore, empirical analyses of these different methods reveal that several of them produce both systematic and random errors. These errors can result in erroneous estimations of regression coefficients in terms of direction and/or size as well as an issue where truly significant relationships might be found to be insignificant. This shows that research findings can be influenced by the MM used, which would argue in favor of the establishment of a preferred method as well as more transparency on the utilized method in future studies. This article provides insight into the matching process and methods, suggests a preferred method, and should aid researchers, reviewers, and editors with both combining multiple databases and describing and assessing them.

The Relationship between Strength and Abrasion Characterizations in Granite Building Stones

2021 ◽  
pp. qjegh2020-045
Author(s):  
A. Cheshomi ◽  
M. Moradizadeh
Keyword(s):  
Dimensionless Parameter ◽  
Empirical Relationship ◽  
Building Stones ◽  
Brazilian Tensile Strength ◽  
Strength Parameters ◽  
Empirical Relationships ◽  
Quartz Content ◽  
Simultaneous Impact ◽  
Rock Abrasion ◽  
The Relationship

The wear of cutting blades during the preparation of building stones is an inevitable issue that occurs due to the contact of the blade with rock components. The present study aims to investigate the feasibility of proposing experimental relations of strength parameters and mineralogical hardness with Cerchar and LCPC tests. For this purpose, 18 samples of granite building stones were selected and Equivalent Quartz Content (EQC), compressive and Brazilian tensile strength (UCS and BTS), Cerchar, and LCPC abrasivity indices (CAI and LAC) were determined. The results showed the lack of any significant relationship between strength and abrasion properties. However, when evaluating the simultaneous impact of EQC and UCS using the rock abrasion index (RAI=UCS×EQC), significant valid empirical relationships between RAI-CAI and RAI-LAC were derived. To investigate the simultaneous effect of UCS, BTS, and EQC, a dimensionless parameter, i.e. modified rock abrasion index (MRAI=(UCSBTS)×EQC) was introduced. Moreover, it was found that the empirical relationship between MRAI-CAI was more significant and valid than the previous relations. Verification of the proposed relationship with the values of other researchers and 6 new samples for estimating CAI and LAC based on UCS, BTS, and EQC was found to be highly accurate for granite building stones.

Ultimate resistance and rotation capacity of low yielding high hardening aluminium alloy beams under non-uniform bending

2019 ◽  
Vol 135 ◽  
pp. 123-136 ◽  
Author(s):  
Vincenzo Piluso ◽  
Alessandro Pisapia ◽  
Elide Nastri ◽  
Rosario Montuori
Keyword(s):  
Aluminium Alloy ◽  
Rotation Capacity ◽  
Ultimate Resistance

scholarly journals The Influence of the Material Properties on the Ultimate Behaviour of Aluminium H-shaped Beams

2021 ◽  
Vol 15 (1) ◽  
pp. 176-188
Author(s):  
Rosario Montuori ◽  
Elide Nastri ◽  
Vincenzo Piluso ◽  
Alessandro Pisapia
Keyword(s):  
Material Properties ◽  
Slenderness Ratio ◽  
Bending Moment ◽  
Constitutive Law ◽  
Rotation Capacity ◽  
Moment Gradient ◽  
Dimensional Parameters ◽  
The Moment ◽  
Plastic Rotation Capacity ◽  
Ultimate Resistance

Background: In this paper, the influence of the Ramberg-Osgood exponent on the ultimate behaviour of the H-shaped (or I-shaped) aluminium beams subjected to non-uniform bending moment is investigated. Methods: In particular, the results of a wide parametric analysis recently carried out by the authors are herein exploited to point out the influence of the material properties. The flange slenderness, the flange-to-web slenderness ratio, and the non-dimensional shear length, accounting for the moment gradient, are the main non-dimensional parameters governing the ultimate resistance and the rotation capacity of H-shaped aluminium beams. Results: The influence of these parameters was investigated considering four different materials covering both low yielding-high hardening alloys and high yielding-low hardening alloys, which are characterised by significant differences in the values of the Ramberg-Osgood exponent of the stress-strain constitutive law of the material. Conclusion: Finally, empirical formulations for predicting the non-dimensional ultimate flexural strength and the plastic rotation capacity of H-section aluminium beams under moment gradient have been provided as a function of the Ramberg-Osgood exponent and all the above non-dimensional parameters.

scholarly journals A Simple Method for P-waves Velocity Estimation Using Pore Attributes Shape Factor and Tortuosity

2020 ◽  
Vol 9 (2) ◽  
pp. 83-89
Author(s):  
Muhammad Burhannudinnur ◽  
Suryo Prakoso
Keyword(s):  
Wave Velocity ◽  
Shape Factor ◽  
Empirical Relationship ◽  
Velocity Estimation ◽  
P Wave ◽  
Simple Relationship ◽  
P Waves ◽  
Simple Method ◽  
P Wave Velocity ◽  
Relationship Of

Several researchers have arranged an approach to estimating the P-wave velocity, but none of them specifically relates to the pore attribute. Pore attributes are one of the main factors that affect pore complexity and rock quality. If P-wave velocity is influenced by the pore complexity, then it should be possible to arrange a simple relationship of P-wave velocity with the pore attribute. This study is intended to construct an empirical relationship of P-wave velocity with a combination of pore attributes, shape factor, and tortuosity (Fsτ) so that the P-wave velocity can be easily estimated. This study used two sandstone datasets from 2 different basins, which are the northern part of the West Java basin and the Kutai basin. This research shows that a simple empirical equation can be arranged to relate the P-wave velocity with Fsτ. This relationship provides a good correlation coefficient. It offers an easy and straightforward approach to estimating P-wave

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