Ultimate Strength Behavior Study by Regression Analysis of Beam Test Data

10.14359/7872 ◽  
1963 ◽  
Vol 60 (5) ◽  
Keyword(s):  
Regression Analysis ◽  
Ultimate Strength ◽  
Test Data ◽  
Beam Test ◽  
Behavior Study ◽  
Strength Behavior

Investigation on the Post-Ultimate Strength Behaviour of Sandwich Plate

2014 ◽  
Author(s):  
Wei Wang ◽  
Weijun Xu ◽  
Xiongliang Yao ◽  
Nana Yang
Keyword(s):  
Ultimate Strength ◽  
Carrying Capacity ◽  
Failure Modes ◽  
Sandwich Plate ◽  
Experimental Results ◽  
Sandwich Plates ◽  
Load Carrying Capacity ◽  
Load Carrying ◽  
Strength Behavior ◽  
Simulation Results

This paper focuses on the post-ultimate strength behavior of sandwich plates. With widely application of the laminate on the ship and offshore structures, the post-ultimate strength behavior is becoming more important for safety evaluation of structures. Since the post-ultimate strength behavior can reflect the collapse extent of sandwich plate when subjected to extreme loads. A sandwich plate was modeled by FEM, its load-displacement relationship was obtained and its collapse characteristics were analyzed. The load-displacement relationship indicates its post-ultimate strength behavior, which is shown as that the load carrying capacity has a rapidly reduction when the ultimate strength is exceeded, and that the failure modes of the sandwich plate are determined by the parameter of individual layer. The simulation results were validated against experimental results. Conclusions are drawn: the displacement of sandwich plate under axial compression increased slowly before reaching the ultimate strength, once the ultimate strength was exceeded, the loads exerted on the structures sharply decreased with slowly increased displacement until the plate cracked. The simulation results have a good agreement with the experimental results. The mainly failure modes of sandwich plates can be interpreted as delamination between skin & core and core compression fracture, which are typical failure modes in engineering. The stiffness of sandwich structures decreased due to the interlaminar cracking or skin fracture, further the load carrying capacity decreased, which is of significance for guiding the design of sandwich structures.

scholarly journals Ultimate strength formulation of stiffened panels under in-plane compression or tension with cracking damage

2018 ◽  
Vol 15 (1) ◽  
pp. 1-16
Author(s):  
Mohammad Reza Zareei ◽  
Mehdi Iranmanesh
Keyword(s):  
Risk Assessment ◽  
Regression Analysis ◽  
Closed Form ◽  
Ultimate Strength ◽  
Nonlinear Fem ◽  
Stiffened Panels ◽  
Plane Compression ◽  
Steel Panels ◽  
Stiffened Steel

The aim of the present study is to develop closed-form formulations for predicting the ultimate compressive and tensional strength of stiffened steel panels with crack damages. First, a numerical database is generated. This database includes the ultimate strength levels of stiffened steel panels with cracks subjected to axial compressive or tensile loads. It was carried out with a series of nonlinear FEM analyses by varying the size of crack damage. In the following sections, regression analysis is used for deriving the empirical formulations. The results of the present paper can be used for the reliability and risk assessment of structures, including stiffened steel panels with cracks. 

Regression analysis of ames test data

1981 ◽  
Vol 3 (5) ◽  
pp. 575-586 ◽  
Author(s):  
Lawrence E. Myers ◽  
Nancy H. Sexton ◽  
Leslie I. Southerland ◽  
Thomas J. Wolff
Keyword(s):  
Regression Analysis ◽  
Test Data ◽  
Ames Test

scholarly journals Prediction of the Ultimate Strength of Notched and Unnotched IM7/977-3 Laminated Composites Using a Micromechanics Approach

Polymers ◽  
2021 ◽  
Vol 13 (20) ◽  
pp. 3491
Author(s):  
Manzar Masud ◽  
Moosa S. M. Al Kharusi ◽  
Muhammad Umair Ali ◽  
Aamir Mubashar ◽  
Shaik Javeed Hussain ◽  
...  
Keyword(s):  
Ultimate Strength ◽  
Test Data ◽  
Experimental Test ◽  
Laminated Composites ◽  
Compressive Load ◽  
Failure Criteria ◽  
Analysis Technique ◽  
Proposed Model ◽  
Tension And Compression ◽  
Failure Loads

This paper proposes a multi-scale analysis technique based on the micromechanics of failure (MMF) to predict and investigate the damage progression and ultimate strength at failure of laminated composites. A lamina’s representative volume element (RVE) is developed to predict and calculate constituent stresses. Damages that occurred in the constituents are calculated using separate failure criteria for both fiber and matrix. Subsequently, the volume-based damage homogenization technique is utilized to prevent the localization of damage throughout the total matrix zone. The proposed multiscale analysis procedure is then used to investigate the notched and unnotched behavior of three multi-directional composite layups, [30, 60, 90, −60, 30]2s, [0, 45, 90, −45]2s, and [60, 0, −60]3s, subjected to static tension and compression loading. The specimen is fabricated from unidirectionally reinforced composite (IM7/977-3). The prediction of ultimate strength at failure and equivalent stiffness are then benchmarked against the experimental test data. The comparative analysis with various failure models is also carried out to validate the proposed model. MMF demonstrated the capability to correctly predict the ultimate strength at failure for a range of multidirectional composites laminates under tensile and compressive load. The numerically predicted findings revealed a good agreement with the experimental test data. Out of the three investigated composite layups, the simulated results for the quasi-isotropic [0, 45, 90, −45]2S layup agreed extremely well with the experimental results with all the percentage errors within 10% of the measured failure loads.

scholarly journals The Effects of Organizational Spirituality on Organizational Commitment and Happiness in MBA Expert Managers

2018 ◽  
pp. 75-87
Author(s):  
Maryam Mahdavi ◽  
Fatemehsadat Mousavifard ◽  
Abdolhossein Ayoubi
Keyword(s):  
Regression Analysis ◽  
Organizational Commitment ◽  
Linear Regression ◽  
Test Data ◽  
Positive Relationship ◽  
Linear Regression Analysis ◽  
Business Managers ◽  
Perception Management ◽  
Organizational Spirituality ◽  
Complete Count

This study aims at evaluating the effect of organizational commitment on organizational spirituality and happiness among MBA expert managers south of Iran; it is a descriptive correlational study. This study evaluated 338 participants based on complete count method; participants were MBA expert managers south of Iran. Data were gathered applying Hall and Edwards, organizational commitment Questionnaire of Mowdy, Porter & Steers and Oxford Happiness Test. Data were analysed by multi-variable linear regression analysis by simultaneous method by SPSS22. Findings indicate that there is a positive relationship between organizational spirituality and its components with organizational commitment and its three aspects and there is a positive relationship between organizational spirituality, happiness and its dimensions. Among different Aspects of organizational spirituality, awareness, instability, perception management and magnification could predict organizational commitment, and awareness, true acceptance and helplessness could predict variable of business managers’ happiness.

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