A Review of Generalized Failure Criteria Based on the Plastic Yield Strip Model

2009 ◽  
pp. I-24-I-24-27
Author(s):  
R de Wit
Keyword(s):  
Failure Criteria ◽  
Plastic Yield

Multiaxial Failure Criteria for Cellular Materials

1990 ◽  
Vol 207 ◽  
Author(s):  
T. C. Triantafillou ◽  
L. J. Gibson
Keyword(s):  
Stress State ◽  
Brittle Fracture ◽  
Engineering Design ◽  
Failure Criteria ◽  
Cellular Materials ◽  
Elastic Buckling ◽  
Cellular Solids ◽  
Plastic Yield ◽  
Proper Design

AbstractCellular materials are increasingly used in engineering. Proper design requires an understanding of the response of the materials to stress; and, in real engineering design, the stress state is often a complex one. In this paper we model the elastic buckling, plastic yield, and brittle fracture of cellular solids under multiaxial stresses to develop equations describing their failure surfaces. Comparison of the analysis with data shows that the models describe the main features of the multiaxial behavior of foams well.

Experts' opinion on 2nd-line treatments failure criteria for patients with multiple sclerosis

2018 ◽  
Author(s):  
JEROME DE SEZE ◽  
Françoise Durand-Dubief ◽  
Elisabeth Maillart ◽  
Elisabeth ['MEKIES'] ◽  
Elisabeth ['papeix'] ◽  
...  
Keyword(s):  
Multiple Sclerosis ◽  
Failure Criteria

scholarly journals Trial of aerosolised surfactant for preterm infants with respiratory distress syndrome

2021 ◽  
pp. fetalneonatal-2021-321645
Author(s):  
Luke Jardine ◽  
Kei Lui ◽  
Helen G Liley ◽  
Timothy Schindler ◽  
James Fink ◽  
...  
Keyword(s):  
Respiratory Distress Syndrome ◽  
Respiratory Distress ◽  
Preterm Infants ◽  
Distress Syndrome ◽  
Failure Criteria ◽  
Open Label ◽  
Dose Escalation Study ◽  
Safety Issues ◽  
Label Dose ◽  
Historical Controls

ObjectiveTo evaluate the safety of an aerosolised surfactant, SF-RI 1, administered via nasal continuous positive airway pressure (nCPAP) and a prototype breath synchronisation device (AeroFact), to preterm infants with respiratory distress syndrome (RDS).DesignMulticentre, open-label, dose-escalation study with historical controls.SettingNewborn intensive care units at Mater Mothers’ Hospital, Brisbane, and Royal Hospital for Women, Sydney, Australia.PatientsInfants 26 weeks through 30 weeks gestation who required nCPAP 6–8 cmH2O and fraction of inspired oxygen (FiO2) <0.30 at <2 hours of age.InterventionsIn part 1, infants received a single dose of 216 mg/kg of aerosolised surfactant. In part 2, infants could receive up to four doses of aerosolised surfactant. Three historical control infants were matched for each enrolled infant.Main outcome measuresTreatment failure was defined as Respiratory Severity Score (FiO2×cmH2O nCPAP) >2.4, nCPAP >8 cmH2O, arterial carbon dioxide >65 mm Hg, pH <7.20 or three severe apnoeas within 6 hours during the first 72 hours of life. Other outcomes included tolerance of the AeroFact treatment and complications of prematurity.Results10 infants were enrolled in part 1 and 21 in part 2 and were compared with 93 historical controls. No safety issues were identified. In part 2, 6 of 21 (29%) AeroFact-treated infants compared with 30 of 63 (48%) control infants met failure criteria. Kaplan-Meier analysis of patients in part 2 showed a trend towards decreased rate of study failure in the AeroFact-treated infants compared with historical controls (p=0.10).ConclusionThe AeroFact system can safely deliver aerosolised surfactant to preterm infants with RDS who are on nCPAP.Trial registration numberACTRN12617001458325.

scholarly journals Introduction to Macroscopic Optimal Design in the Mechanics of Composite Materials and Structures

2021 ◽  
Vol 5 (2) ◽  
pp. 36
Author(s):  
Aleksander Muc
Keyword(s):  
Composite Materials ◽  
Composite Structures ◽  
Constitutive Relations ◽  
A Priori ◽  
Chemical Properties ◽  
Composite Plates ◽  
Failure Criteria ◽  
Lagrange Equations ◽  
Homogenization Methods ◽  
Mechanics Of Composite Materials

The main goal of building composite materials and structures is to provide appropriate a priori controlled physico-chemical properties. For this purpose, a strengthening is introduced that can bear loads higher than those borne by isotropic materials, improve creep resistance, etc. Composite materials can be designed in a different fashion to meet specific properties requirements.Nevertheless, it is necessary to be careful about the orientation, placement and sizes of different types of reinforcement. These issues should be solved by optimization, which, however, requires the construction of appropriate models. In the present paper we intend to discuss formulations of kinematic and constitutive relations and the possible application of homogenization methods. Then, 2D relations for multilayered composite plates and cylindrical shells are derived with the use of the Euler–Lagrange equations, through the application of the symbolic package Mathematica. The introduced form of the First-Ply-Failure criteria demonstrates the non-uniqueness in solutions and complications in searching for the global macroscopic optimal solutions. The information presented to readers is enriched by adding selected review papers, surveys and monographs in the area of composite structures.

scholarly journals Formulation of multiaxial fatigue failure criteria for spectral method

2020 ◽  
Vol 135 ◽  
pp. 105519 ◽  
Author(s):  
Adam Niesłony ◽  
Michał Böhm ◽  
Robert Owsiński
Keyword(s):  
Spectral Method ◽  
Fatigue Failure ◽  
Failure Criteria ◽  
Multiaxial Fatigue

Evaluation and optimization of a shock load de-icing method for transmission lines with combined ice failure criteria

2019 ◽  
Vol 165 ◽  
pp. 102818 ◽  
Author(s):  
Kunpeng Ji ◽  
Bin Liu ◽  
Yongfeng Cheng ◽  
Xueping Zhan ◽  
Ghyslaine McClure
Keyword(s):  
Transmission Lines ◽  
Failure Criteria ◽  
Shock Load ◽  
Ice Failure
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