scholarly journals On the Maximum Limit of Compressive Strain in the Compressive Fatigue Test of Rubber Vibration Insulator under Constant Deflection

1959 ◽  
Vol 8 (73) ◽  
pp. 803-808
Author(s):  
Yoshikazu SAWARAGI ◽  
Masayoshi FUKUDA
Keyword(s):  
Fatigue Test ◽  
Compressive Strain ◽  
Vibration Insulator ◽  
Maximum Limit

Study on Effects of Non-Isothermal Condition and Strain Holding on Environmentally Assisted Fatigue in PWR Primary Water Environment: Step II

2017 ◽  
Author(s):  
Seiji Asada ◽  
Daiki Takagoshi ◽  
Yuichi Fukuta ◽  
Kazuya Tsutsumi ◽  
Kawaljit Ahluwalia ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Fatigue Test ◽  
Fatigue Behavior ◽  
Compressive Strain ◽  
Water Environment ◽  
Isothermal Condition ◽  
Fatigue Tests ◽  
Transient Condition ◽  
Isothermal Fatigue ◽  
Primary Water

In order to understand the fatigue behavior in PWR primary water environment, the influence of non-isothermal transient condition was investigated for austenitic stainless steel 316SS. In our previous study (PVP2016-63798), isothermal and non-isothermal environmentally assisted fatigue tests were performed. The fatigue life of the non-isothermal fatigue test consisted of a high temperature and tensile strain rate transient, a portion of which occurred in the compressive strain region of the strain cycle. The result of this test showed longer life than the predicted fatigue life estimated by the modified rate approach and Fen factor as presented in NUREG/CR-6909 Rev.1. In this paper, the reason why the fatigue test showed longer fatigue life is studied. Crack growth analysis was performed to understand the effect of the environment on fatigue life. Additionally, application of the Weighted K Rate (WKR) method described in reference (PVP2016-63497) was applied to a series of tests. This approach showed good agreement on fatigue life for a number of different waveforms for isothermal tests. The methodology was applied to some of this investigation’s non-isothermal fatigue tests and shown to be an improvement that justifies further investigation.

A FAST ROTATING BENDING FATIGUE TEST MACHINE

2017 ◽  
Author(s):  
Marco Antonio Meggiolaro ◽  
Jaime T P Castro ◽  
Rodrigo de Moura Nogueira
Keyword(s):  
Fatigue Test ◽  
Test Machine ◽  
Bending Fatigue ◽  
Bending Fatigue Test ◽  
Rotating Bending Fatigue ◽  
Rotating Bending ◽  
Fast Rotating

Inter-laboratory comparison of a fatigue test

2005 ◽  
Vol 47 (9) ◽  
pp. 529-533
Author(s):  
Magnus Holmgren ◽  
Klas Johansson ◽  
Erland Johnson ◽  
Thomas Svensson
Keyword(s):  
Fatigue Test

Toxic Elements in Dried Milk and Evaluation of their Dietary Intake in Infant Formula

2020 ◽  
Keyword(s):  
Infant Formula ◽  
Toxic Elements ◽  
Daily Intake ◽  
Milk Formula ◽  
Tolerable Daily Intake ◽  
Mean Values ◽  
Infant Foods ◽  
Icp Ms ◽  
Maximum Limit ◽  
Sensitive Group

Infant’s feeding patterns are important for development and growth; therefore babies are very sensitive to toxic elements, mainly through their food, so in the present study, the concentrations and daily intake of some Toxic Elements (TEs); Lead (Pb), Arsenic (As), Cadmium (Cd), Mercury (Hg) and Aluminum (Al) were measured in different and random 60 dried infant foods {30 infant formula (0-6 months) and 30 milk-cereal based infant formula (6 months)} which obtained from various supermarkets and pharmacies. The analysis was done using Inductive Coupled Plasma - Mass Spectrometer (ICP-MS). It could be determined the lead, arsenic, cadmium, mercury and aluminum by mean values of 0.424±0.006, 0.205±0.003, 0.014±0.0001, 0.298±0.007and 0.464±0.029 mg/Kg in the examined infant milk formula samples and a ranged minimum to maximum concentrations of 0.114-0.177, 0.155-0.293, 0.014-0.015, 0.282-0.310 and 0.287-0.437 mg/kg, respectively in the examined milk-cereal based infant formula. Present study indicates that, the greater level of contamination of examined infant formula samples with toxic elements (lead and mercury) surpasses the maximum limit and Provisional Tolerable Daily Intake (PTDI) of these elements. Mercury is over PTDI (0.0005 mg/kg bw/day) in all milk-cereal based infant formula samples, also arsenic in all examined samples of this type of formula was exceed the maximum limit (0.05 mg/kg) of Indian standard. This investigation shows such types of infant formula need more amendment to set limit of more toxic metals for this sensitive group of population.

Polyhedral Oligomeric Silsesquioxane /Platelets Rich Plasma/Gelrite-Based Hydrogel Scaffold for Bone Tissue Engineering

2020 ◽  
Vol 26 (26) ◽  
pp. 3147-3160
Author(s):  
Saeedeh Ahmadipour ◽  
Jaleh Varshosaz ◽  
Batool Hashemibeni ◽  
Leila Safaeian ◽  
Maziar Manshaei
Keyword(s):  
Bone Fractures ◽  
Compressive Strain ◽  
Gelation Time ◽  
Polyhedral Oligomeric Silsesquioxane ◽  
Local Drug Delivery ◽  
Gelling Agent ◽  
Control Group ◽  
Hydrogel Scaffold ◽  
Alizarin Red ◽  
Oligomeric Silsesquioxane

Background: Polyhedral oligomeric silsesquioxane (POSS) is a monomer with silicon structure and an internal nanometric cage. Objective: The purpose of this study was to provide an injectable hydrogel that could be easily located in open or closed bone fractures and injuries, and also to reduce the possible risks of infections caused by bone graft either as an allograft or an autograft. Methods: Various formulations of temperature sensitive hydrogels containing hydroxyapatite, Gelrite, POSS and platelets rich plasma (PRP), such as the co-gelling agent and cell growth enhancer, were prepared. The hydrogels were characterized for their injectability, gelation time, phase transition temperature and viscosity. Other physical properties of the optimized formulation including compressive stress, compressive strain and Young’s modulus as mechanical properties, as well as storage and loss modulus, swelling ratio, biodegradation behavior and cell toxicity as rheometrical parameters were studied on human osteoblast MG-63 cells. Alizarin red tests were conducted to study the qualitative and quantitative osteogenic capability of the designed scaffold, and the cell adhesion to the scaffold was visualized by scanning electron microscopy. Results: The results demonstrated that the hydrogel scaffold mechanical force and injectability were 3.34±0.44 Mpa and 12.57 N, respectively. Moreover, the scaffold showed higher calcium granules production in alizarin red staining compared to the control group. The proliferation of the cells in G4.5H1P0.03PRP10 formulation was significantly higher than in other formulations (p<0.05). Conclusion: The optimized Gelrite/Hydroxyapatite/POSS/PRP hydrogel scaffold has useful impacts on osteoblasts activity, and may be beneficial for local drug delivery in complications including a break or bone loss.

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